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/*
* Copyright 2005 Juan Lang
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* This file implements ASN.1 DER decoding of a limited set of types.
* It isn't a full ASN.1 implementation. Microsoft implements BER
* encoding of many of the basic types in msasn1.dll, but that interface is
* undocumented, so I implement them here.
*
* References:
* "A Layman's Guide to a Subset of ASN.1, BER, and DER", by Burton Kaliski
* (available online, look for a PDF copy as the HTML versions tend to have
* translation errors.)
*
* RFC3280, http://www.faqs.org/rfcs/rfc3280.html
*
* MSDN, especially:
* http://msdn.microsoft.com/library/en-us/seccrypto/security/constants_for_cryptencodeobject_and_cryptdecodeobject.asp
*/
#include <assert.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#define NONAMELESSUNION
#include "windef.h"
#include "winbase.h"
#include "excpt.h"
#include "wincrypt.h"
#include "winreg.h"
#include "snmp.h"
#include "wine/debug.h"
#include "wine/exception.h"
#include "crypt32_private.h"
/* This is a bit arbitrary, but to set some limit: */
#define MAX_ENCODED_LEN 0x02000000
#define ASN_FLAGS_MASK 0xe0
#define ASN_TYPE_MASK 0x1f
WINE_DEFAULT_DEBUG_CHANNEL(crypt);
struct GenericArray
{
DWORD cItems;
BYTE *rgItems;
};
typedef BOOL (WINAPI *CryptDecodeObjectFunc)(DWORD, LPCSTR, const BYTE *,
DWORD, DWORD, void *, DWORD *);
typedef BOOL (WINAPI *CryptDecodeObjectExFunc)(DWORD, LPCSTR, const BYTE *,
DWORD, DWORD, PCRYPT_DECODE_PARA, void *, DWORD *);
/* Prototypes for built-in decoders. They follow the Ex style prototypes.
* The dwCertEncodingType and lpszStructType are ignored by the built-in
* functions, but the parameters are retained to simplify CryptDecodeObjectEx,
* since it must call functions in external DLLs that follow these signatures.
*/
static BOOL WINAPI CRYPT_AsnDecodeChoiceOfTime(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
static BOOL WINAPI CRYPT_AsnDecodePubKeyInfoInternal(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
/* Like CRYPT_AsnDecodeExtensions, except assumes rgExtension is set ahead of
* time, doesn't do memory allocation, and doesn't do exception handling.
* (This isn't intended to be the externally-called one.)
*/
static BOOL WINAPI CRYPT_AsnDecodeExtensionsInternal(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
/* Assumes algo->Parameters.pbData is set ahead of time. Internal func. */
static BOOL WINAPI CRYPT_AsnDecodeAlgorithmId(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
/* Internal function */
static BOOL WINAPI CRYPT_AsnDecodeBool(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
/* Assumes the CRYPT_DATA_BLOB's pbData member has been initialized */
static BOOL WINAPI CRYPT_AsnDecodeOctetsInternal(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
/* Like CRYPT_AsnDecodeBits, but assumes the CRYPT_INTEGER_BLOB's pbData
* member has been initialized, doesn't do exception handling, and doesn't do
* memory allocation.
*/
static BOOL WINAPI CRYPT_AsnDecodeBitsInternal(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
static BOOL WINAPI CRYPT_AsnDecodeBits(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
static BOOL WINAPI CRYPT_AsnDecodeInt(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
/* Like CRYPT_AsnDecodeInteger, but assumes the CRYPT_INTEGER_BLOB's pbData
* member has been initialized, doesn't do exception handling, and doesn't do
* memory allocation.
*/
static BOOL WINAPI CRYPT_AsnDecodeIntegerInternal(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo);
/* Like CRYPT_AsnDecodeInteger, but unsigned. */
static BOOL WINAPI CRYPT_AsnDecodeUnsignedIntegerInternal(
DWORD dwCertEncodingType, LPCSTR lpszStructType, const BYTE *pbEncoded,
DWORD cbEncoded, DWORD dwFlags, PCRYPT_DECODE_PARA pDecodePara,
void *pvStructInfo, DWORD *pcbStructInfo);
BOOL WINAPI CryptDecodeObject(DWORD dwCertEncodingType, LPCSTR lpszStructType,
const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags, void *pvStructInfo,
DWORD *pcbStructInfo)
{
static HCRYPTOIDFUNCSET set = NULL;
BOOL ret = FALSE;
CryptDecodeObjectFunc pCryptDecodeObject;
HCRYPTOIDFUNCADDR hFunc;
TRACE("(0x%08lx, %s, %p, %ld, 0x%08lx, %p, %p)\n", dwCertEncodingType,
debugstr_a(lpszStructType), pbEncoded, cbEncoded, dwFlags,
pvStructInfo, pcbStructInfo);
if (!pvStructInfo && !pcbStructInfo)
{
SetLastError(ERROR_INVALID_PARAMETER);
return FALSE;
}
/* Try registered DLL first.. */
if (!set)
set = CryptInitOIDFunctionSet(CRYPT_OID_DECODE_OBJECT_FUNC, 0);
CryptGetOIDFunctionAddress(set, dwCertEncodingType, lpszStructType, 0,
(void **)&pCryptDecodeObject, &hFunc);
if (pCryptDecodeObject)
{
ret = pCryptDecodeObject(dwCertEncodingType, lpszStructType,
pbEncoded, cbEncoded, dwFlags, pvStructInfo, pcbStructInfo);
CryptFreeOIDFunctionAddress(hFunc, 0);
}
else
{
/* If not, use CryptDecodeObjectEx */
ret = CryptDecodeObjectEx(dwCertEncodingType, lpszStructType, pbEncoded,
cbEncoded, dwFlags, NULL, pvStructInfo, pcbStructInfo);
}
return ret;
}
/* Gets the number of length bytes from the given (leading) length byte */
#define GET_LEN_BYTES(b) ((b) <= 0x7f ? 1 : 1 + ((b) & 0x7f))
/* Helper function to get the encoded length of the data starting at pbEncoded,
* where pbEncoded[0] is the tag. If the data are too short to contain a
* length or if the length is too large for cbEncoded, sets an appropriate
* error code and returns FALSE.
*/
static BOOL WINAPI CRYPT_GetLen(const BYTE *pbEncoded, DWORD cbEncoded,
DWORD *len)
{
BOOL ret;
if (cbEncoded <= 1)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
else if (pbEncoded[1] <= 0x7f)
{
if (pbEncoded[1] + 1 > cbEncoded)
{
SetLastError(CRYPT_E_ASN1_EOD);
ret = FALSE;
}
else
{
*len = pbEncoded[1];
ret = TRUE;
}
}
else
{
BYTE lenLen = GET_LEN_BYTES(pbEncoded[1]);
if (lenLen > sizeof(DWORD) + 1)
{
SetLastError(CRYPT_E_ASN1_LARGE);
ret = FALSE;
}
else if (lenLen + 2 > cbEncoded)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
else
{
DWORD out = 0;
pbEncoded += 2;
while (--lenLen)
{
out <<= 8;
out |= *pbEncoded++;
}
if (out + lenLen + 1 > cbEncoded)
{
SetLastError(CRYPT_E_ASN1_EOD);
ret = FALSE;
}
else
{
*len = out;
ret = TRUE;
}
}
}
return ret;
}
/* Helper function to check *pcbStructInfo, set it to the required size, and
* optionally to allocate memory. Assumes pvStructInfo is not NULL.
* If CRYPT_DECODE_ALLOC_FLAG is set in dwFlags, *pvStructInfo will be set to a
* pointer to the newly allocated memory.
*/
static BOOL CRYPT_DecodeEnsureSpace(DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo,
DWORD bytesNeeded)
{
BOOL ret = TRUE;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
{
if (pDecodePara && pDecodePara->pfnAlloc)
*(BYTE **)pvStructInfo = pDecodePara->pfnAlloc(bytesNeeded);
else
*(BYTE **)pvStructInfo = LocalAlloc(0, bytesNeeded);
if (!*(BYTE **)pvStructInfo)
ret = FALSE;
else
*pcbStructInfo = bytesNeeded;
}
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
return ret;
}
/* tag:
* The expected tag of the item. If tag is 0, decodeFunc is called
* regardless of the tag value seen.
* offset:
* A sequence is decoded into a struct. The offset member is the
* offset of this item within that struct.
* decodeFunc:
* The decoder function to use. If this is NULL, then the member isn't
* decoded, but minSize space is reserved for it.
* minSize:
* The minimum amount of space occupied after decoding. You must set this.
* optional:
* If true, and the tag doesn't match the expected tag for this item,
* or the decodeFunc fails with CRYPT_E_ASN1_BADTAG, then minSize space is
* filled with 0 for this member.
* hasPointer, pointerOffset, minSize:
* If the item has dynamic data, set hasPointer to TRUE, pointerOffset to
* the offset within the (outer) struct of the data pointer (or to the
* first data pointer, if more than one exist).
* size:
* Used by CRYPT_AsnDecodeSequence, not for your use.
*/
struct AsnDecodeSequenceItem
{
BYTE tag;
DWORD offset;
CryptDecodeObjectExFunc decodeFunc;
DWORD minSize;
BOOL optional;
BOOL hasPointer;
DWORD pointerOffset;
DWORD size;
};
static BOOL CRYPT_AsnDecodeSequenceItems(DWORD dwCertEncodingType,
struct AsnDecodeSequenceItem items[], DWORD cItem, const BYTE *pbEncoded,
DWORD cbEncoded, DWORD dwFlags, void *pvStructInfo, BYTE *nextData)
{
BOOL ret;
DWORD i;
const BYTE *ptr;
ptr = pbEncoded + 1 + GET_LEN_BYTES(pbEncoded[1]);
for (i = 0, ret = TRUE; ret && i < cItem; i++)
{
if (cbEncoded - (ptr - pbEncoded) != 0)
{
DWORD nextItemLen;
if ((ret = CRYPT_GetLen(ptr, cbEncoded - (ptr - pbEncoded),
&nextItemLen)))
{
BYTE nextItemLenBytes = GET_LEN_BYTES(ptr[1]);
if (ptr[0] == items[i].tag || !items[i].tag)
{
if (nextData && pvStructInfo && items[i].hasPointer)
{
TRACE("Setting next pointer to %p\n",
nextData);
*(BYTE **)((BYTE *)pvStructInfo +
items[i].pointerOffset) = nextData;
}
if (items[i].decodeFunc)
{
if (pvStructInfo)
TRACE("decoding item %ld\n", i);
else
TRACE("sizing item %ld\n", i);
ret = items[i].decodeFunc(dwCertEncodingType,
NULL, ptr, 1 + nextItemLenBytes + nextItemLen,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL,
pvStructInfo ? (BYTE *)pvStructInfo + items[i].offset
: NULL, &items[i].size);
if (ret)
{
if (nextData && items[i].hasPointer &&
items[i].size > items[i].minSize)
{
nextData += items[i].size - items[i].minSize;
/* align nextData to DWORD boundaries */
if (items[i].size % sizeof(DWORD))
nextData += sizeof(DWORD) - items[i].size %
sizeof(DWORD);
}
/* Account for alignment padding */
if (items[i].size % sizeof(DWORD))
items[i].size += sizeof(DWORD) -
items[i].size % sizeof(DWORD);
ptr += 1 + nextItemLenBytes + nextItemLen;
}
else if (items[i].optional &&
GetLastError() == CRYPT_E_ASN1_BADTAG)
{
TRACE("skipping optional item %ld\n", i);
items[i].size = items[i].minSize;
SetLastError(NOERROR);
ret = TRUE;
}
else
TRACE("item %ld failed: %08lx\n", i,
GetLastError());
}
else
items[i].size = items[i].minSize;
}
else if (items[i].optional)
{
TRACE("skipping optional item %ld\n", i);
items[i].size = items[i].minSize;
}
else
{
TRACE("tag %02x doesn't match expected %02x\n",
ptr[0], items[i].tag);
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
}
}
else if (items[i].optional)
{
TRACE("missing optional item %ld, skipping\n", i);
items[i].size = items[i].minSize;
}
else
{
TRACE("not enough bytes for item %ld, failing\n", i);
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
}
if (cbEncoded - (ptr - pbEncoded) != 0)
{
TRACE("%ld remaining bytes, failing\n", cbEncoded -
(ptr - pbEncoded));
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
return ret;
}
/* This decodes an arbitrary sequence into a contiguous block of memory
* (basically, a struct.) Each element being decoded is described by a struct
* AsnDecodeSequenceItem, see above.
* startingPointer is an optional pointer to the first place where dynamic
* data will be stored. If you know the starting offset, you may pass it
* here. Otherwise, pass NULL, and one will be inferred from the items.
* Each item decoder is never called with CRYPT_DECODE_ALLOC_FLAG set.
* If any undecoded data are left over, fails with CRYPT_E_ASN1_CORRUPT.
*/
static BOOL CRYPT_AsnDecodeSequence(DWORD dwCertEncodingType,
struct AsnDecodeSequenceItem items[], DWORD cItem, const BYTE *pbEncoded,
DWORD cbEncoded, DWORD dwFlags, PCRYPT_DECODE_PARA pDecodePara,
void *pvStructInfo, DWORD *pcbStructInfo, void *startingPointer)
{
BOOL ret;
TRACE("%p, %ld, %p, %ld, %08lx, %p, %p, %ld, %p\n", items, cItem, pbEncoded,
cbEncoded, dwFlags, pDecodePara, pvStructInfo, *pcbStructInfo,
startingPointer);
if (pbEncoded[0] == ASN_SEQUENCE)
{
DWORD dataLen;
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
DWORD i;
ret = CRYPT_AsnDecodeSequenceItems(dwFlags, items, cItem, pbEncoded,
cbEncoded, dwFlags, NULL, NULL);
if (ret)
{
DWORD bytesNeeded = 0, structSize = 0;
for (i = 0; i < cItem; i++)
{
bytesNeeded += items[i].size;
structSize += items[i].minSize;
}
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, bytesNeeded)))
{
BYTE *nextData;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
if (startingPointer)
nextData = (BYTE *)startingPointer;
else
nextData = (BYTE *)pvStructInfo + structSize;
memset(pvStructInfo, 0, structSize);
ret = CRYPT_AsnDecodeSequenceItems(dwFlags, items, cItem,
pbEncoded, cbEncoded, dwFlags, pvStructInfo, nextData);
}
}
}
}
else
{
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
TRACE("returning %d (%08lx)\n", ret, GetLastError());
return ret;
}
/* tag:
* The expected tag of the entire encoded array (usually a variant
* of ASN_SETOF or ASN_SEQUENCEOF.)
* decodeFunc:
* used to decode each item in the array
* itemSize:
* is the minimum size of each decoded item
* hasPointer:
* indicates whether each item has a dynamic pointer
* pointerOffset:
* indicates the offset within itemSize at which the pointer exists
*/
struct AsnArrayDescriptor
{
BYTE tag;
CryptDecodeObjectExFunc decodeFunc;
DWORD itemSize;
BOOL hasPointer;
DWORD pointerOffset;
};
struct AsnArrayItemSize
{
DWORD encodedLen;
DWORD size;
};
/* Decodes an array of like types into a struct GenericArray.
* The layout and decoding of the array are described by a struct
* AsnArrayDescriptor.
*/
static BOOL CRYPT_AsnDecodeArray(const struct AsnArrayDescriptor *arrayDesc,
const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo,
void *startingPointer)
{
BOOL ret = TRUE;
TRACE("%p, %p, %ld, %08lx, %p, %p, %ld, %p\n", arrayDesc, pbEncoded,
cbEncoded, dwFlags, pDecodePara, pvStructInfo, *pcbStructInfo,
startingPointer);
if (pbEncoded[0] == arrayDesc->tag)
{
DWORD dataLen;
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
DWORD bytesNeeded, cItems = 0;
BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
/* There can be arbitrarily many items, but there is often only one.
*/
struct AsnArrayItemSize itemSize = { 0 }, *itemSizes = &itemSize;
bytesNeeded = sizeof(struct GenericArray);
if (dataLen)
{
const BYTE *ptr;
for (ptr = pbEncoded + 1 + lenBytes; ret &&
ptr - pbEncoded - 1 - lenBytes < dataLen; )
{
DWORD itemLenBytes, itemDataLen, size;
itemLenBytes = GET_LEN_BYTES(ptr[1]);
/* Each item decoded may not tolerate extraneous bytes, so
* get the length of the next element and pass it directly.
*/
ret = CRYPT_GetLen(ptr, cbEncoded - (ptr - pbEncoded),
&itemDataLen);
if (ret)
ret = arrayDesc->decodeFunc(X509_ASN_ENCODING, 0, ptr,
1 + itemLenBytes + itemDataLen,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, NULL,
&size);
if (ret)
{
DWORD nextLen;
cItems++;
if (itemSizes != &itemSize)
itemSizes = CryptMemRealloc(itemSizes,
cItems * sizeof(struct AsnArrayItemSize));
else
{
itemSizes =
CryptMemAlloc(
cItems * sizeof(struct AsnArrayItemSize));
memcpy(itemSizes, &itemSize, sizeof(itemSize));
}
if (itemSizes)
{
itemSizes[cItems - 1].encodedLen = 1 + itemLenBytes
+ itemDataLen;
itemSizes[cItems - 1].size = size;
bytesNeeded += size;
ret = CRYPT_GetLen(ptr,
cbEncoded - (ptr - pbEncoded), &nextLen);
if (ret)
ptr += nextLen + 1 + GET_LEN_BYTES(ptr[1]);
}
else
ret = FALSE;
}
}
}
if (ret)
{
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, bytesNeeded)))
{
DWORD i;
BYTE *nextData;
const BYTE *ptr;
struct GenericArray *array;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
array = (struct GenericArray *)pvStructInfo;
array->cItems = cItems;
if (startingPointer)
array->rgItems = startingPointer;
else
array->rgItems = (BYTE *)array +
sizeof(struct GenericArray);
nextData = (BYTE *)array->rgItems +
array->cItems * arrayDesc->itemSize;
for (i = 0, ptr = pbEncoded + 1 + lenBytes; ret &&
i < cItems && ptr - pbEncoded - 1 - lenBytes <
dataLen; i++)
{
if (arrayDesc->hasPointer)
*(BYTE **)(array->rgItems + i * arrayDesc->itemSize
+ arrayDesc->pointerOffset) = nextData;
ret = arrayDesc->decodeFunc(X509_ASN_ENCODING, 0, ptr,
itemSizes[i].encodedLen,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL,
array->rgItems + i * arrayDesc->itemSize,
&itemSizes[i].size);
if (ret)
{
DWORD nextLen;
nextData += itemSizes[i].size - arrayDesc->itemSize;
ret = CRYPT_GetLen(ptr,
cbEncoded - (ptr - pbEncoded), &nextLen);
if (ret)
ptr += nextLen + 1 + GET_LEN_BYTES(ptr[1]);
}
}
}
}
if (itemSizes != &itemSize)
CryptMemFree(itemSizes);
}
}
else
{
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
return ret;
}
/* Decodes a DER-encoded BLOB into a CRYPT_DER_BLOB struct pointed to by
* pvStructInfo. The BLOB must be non-empty, otherwise the last error is set
* to CRYPT_E_ASN1_CORRUPT.
* Warning: assumes the CRYPT_DER_BLOB pointed to by pvStructInfo has pbData
* set!
*/
static BOOL WINAPI CRYPT_AsnDecodeDerBlob(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
DWORD dataLen;
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
DWORD bytesNeeded = sizeof(CRYPT_DER_BLOB);
if (!(dwFlags & CRYPT_DECODE_NOCOPY_FLAG))
bytesNeeded += 1 + lenBytes + dataLen;
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
pvStructInfo, pcbStructInfo, bytesNeeded)))
{
CRYPT_DER_BLOB *blob;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
blob = (CRYPT_DER_BLOB *)pvStructInfo;
blob->cbData = 1 + lenBytes + dataLen;
if (blob->cbData)
{
if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
blob->pbData = (BYTE *)pbEncoded;
else
{
assert(blob->pbData);
memcpy(blob->pbData, pbEncoded, blob->cbData);
}
}
else
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
}
}
return ret;
}
/* Like CRYPT_AsnDecodeBitsInternal, but swaps the bytes */
static BOOL WINAPI CRYPT_AsnDecodeBitsSwapBytes(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
TRACE("(%p, %ld, 0x%08lx, %p, %p, %ld)\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
/* Can't use the CRYPT_DECODE_NOCOPY_FLAG, because we modify the bytes in-
* place.
*/
ret = CRYPT_AsnDecodeBitsInternal(dwCertEncodingType, lpszStructType,
pbEncoded, cbEncoded, dwFlags & ~CRYPT_DECODE_NOCOPY_FLAG, pDecodePara,
pvStructInfo, pcbStructInfo);
if (ret && pvStructInfo)
{
CRYPT_BIT_BLOB *blob = (CRYPT_BIT_BLOB *)pvStructInfo;
if (blob->cbData)
{
DWORD i;
BYTE temp;
for (i = 0; i < blob->cbData / 2; i++)
{
temp = blob->pbData[i];
blob->pbData[i] = blob->pbData[blob->cbData - i - 1];
blob->pbData[blob->cbData - i - 1] = temp;
}
}
}
TRACE("returning %d (%08lx)\n", ret, GetLastError());
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeCert(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
__TRY
{
struct AsnDecodeSequenceItem items[] = {
{ 0, offsetof(CERT_SIGNED_CONTENT_INFO, ToBeSigned),
CRYPT_AsnDecodeDerBlob, sizeof(CRYPT_DER_BLOB), FALSE, TRUE,
offsetof(CERT_SIGNED_CONTENT_INFO, ToBeSigned.pbData), 0 },
{ ASN_SEQUENCEOF, offsetof(CERT_SIGNED_CONTENT_INFO,
SignatureAlgorithm), CRYPT_AsnDecodeAlgorithmId,
sizeof(CRYPT_ALGORITHM_IDENTIFIER), FALSE, TRUE,
offsetof(CERT_SIGNED_CONTENT_INFO, SignatureAlgorithm.pszObjId), 0 },
{ ASN_BITSTRING, offsetof(CERT_SIGNED_CONTENT_INFO, Signature),
CRYPT_AsnDecodeBitsSwapBytes, sizeof(CRYPT_BIT_BLOB), FALSE, TRUE,
offsetof(CERT_SIGNED_CONTENT_INFO, Signature.pbData), 0 },
};
if (dwFlags & CRYPT_DECODE_NO_SIGNATURE_BYTE_REVERSAL_FLAG)
items[2].decodeFunc = CRYPT_AsnDecodeBitsInternal;
ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, NULL);
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
/* Internal function */
static BOOL WINAPI CRYPT_AsnDecodeCertVersion(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
DWORD dataLen;
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
ret = CRYPT_AsnDecodeInt(dwCertEncodingType, X509_INTEGER,
pbEncoded + 1 + lenBytes, dataLen, dwFlags, pDecodePara,
pvStructInfo, pcbStructInfo);
}
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeValidity(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
struct AsnDecodeSequenceItem items[] = {
{ 0, offsetof(CERT_PRIVATE_KEY_VALIDITY, NotBefore),
CRYPT_AsnDecodeChoiceOfTime, sizeof(FILETIME), FALSE, FALSE, 0 },
{ 0, offsetof(CERT_PRIVATE_KEY_VALIDITY, NotAfter),
CRYPT_AsnDecodeChoiceOfTime, sizeof(FILETIME), FALSE, FALSE, 0 },
};
ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, NULL);
return ret;
}
/* Internal function */
static BOOL WINAPI CRYPT_AsnDecodeCertExtensions(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
DWORD dataLen;
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
ret = CRYPT_AsnDecodeExtensionsInternal(dwCertEncodingType,
X509_EXTENSIONS, pbEncoded + 1 + lenBytes, dataLen, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo);
}
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeCertInfo(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
__TRY
{
struct AsnDecodeSequenceItem items[] = {
{ ASN_CONTEXT | ASN_CONSTRUCTOR, offsetof(CERT_INFO, dwVersion),
CRYPT_AsnDecodeCertVersion, sizeof(DWORD), TRUE, FALSE, 0, 0 },
{ ASN_INTEGER, offsetof(CERT_INFO, SerialNumber),
CRYPT_AsnDecodeIntegerInternal, sizeof(CRYPT_INTEGER_BLOB), FALSE,
TRUE, offsetof(CERT_INFO, SerialNumber.pbData), 0 },
{ ASN_SEQUENCEOF, offsetof(CERT_INFO, SignatureAlgorithm),
CRYPT_AsnDecodeAlgorithmId, sizeof(CRYPT_ALGORITHM_IDENTIFIER),
FALSE, TRUE, offsetof(CERT_INFO, SignatureAlgorithm.pszObjId), 0 },
{ 0, offsetof(CERT_INFO, Issuer), CRYPT_AsnDecodeDerBlob,
sizeof(CRYPT_DER_BLOB), FALSE, TRUE, offsetof(CERT_INFO,
Issuer.pbData) },
{ ASN_SEQUENCEOF, offsetof(CERT_INFO, NotBefore),
CRYPT_AsnDecodeValidity, sizeof(CERT_PRIVATE_KEY_VALIDITY), FALSE,
FALSE, 0 },
{ 0, offsetof(CERT_INFO, Subject), CRYPT_AsnDecodeDerBlob,
sizeof(CRYPT_DER_BLOB), FALSE, TRUE, offsetof(CERT_INFO,
Subject.pbData) },
{ ASN_SEQUENCEOF, offsetof(CERT_INFO, SubjectPublicKeyInfo),
CRYPT_AsnDecodePubKeyInfoInternal, sizeof(CERT_PUBLIC_KEY_INFO),
FALSE, TRUE, offsetof(CERT_INFO,
SubjectPublicKeyInfo.Algorithm.Parameters.pbData), 0 },
{ ASN_BITSTRING, offsetof(CERT_INFO, IssuerUniqueId),
CRYPT_AsnDecodeBitsInternal, sizeof(CRYPT_BIT_BLOB), TRUE, TRUE,
offsetof(CERT_INFO, IssuerUniqueId.pbData), 0 },
{ ASN_BITSTRING, offsetof(CERT_INFO, SubjectUniqueId),
CRYPT_AsnDecodeBitsInternal, sizeof(CRYPT_BIT_BLOB), TRUE, TRUE,
offsetof(CERT_INFO, SubjectUniqueId.pbData), 0 },
{ ASN_CONTEXT | ASN_CONSTRUCTOR | 3, offsetof(CERT_INFO, cExtension),
CRYPT_AsnDecodeCertExtensions, sizeof(CERT_EXTENSIONS), TRUE, TRUE,
offsetof(CERT_INFO, rgExtension), 0 },
};
ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, NULL);
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeCRLEntry(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
struct AsnDecodeSequenceItem items[] = {
{ ASN_INTEGER, offsetof(CRL_ENTRY, SerialNumber),
CRYPT_AsnDecodeIntegerInternal, sizeof(CRYPT_INTEGER_BLOB), FALSE, TRUE,
offsetof(CRL_ENTRY, SerialNumber.pbData), 0 },
{ 0, offsetof(CRL_ENTRY, RevocationDate), CRYPT_AsnDecodeChoiceOfTime,
sizeof(FILETIME), FALSE, FALSE, 0 },
{ ASN_SEQUENCEOF, offsetof(CRL_ENTRY, cExtension),
CRYPT_AsnDecodeExtensionsInternal, sizeof(CERT_EXTENSIONS), TRUE, TRUE,
offsetof(CRL_ENTRY, rgExtension), 0 },
};
PCRL_ENTRY entry = (PCRL_ENTRY)pvStructInfo;
TRACE("%p, %ld, %08lx, %p, %ld\n", pbEncoded, cbEncoded, dwFlags, entry,
*pcbStructInfo);
ret = CRYPT_AsnDecodeSequence(X509_ASN_ENCODING, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
NULL, entry, pcbStructInfo, entry ? entry->SerialNumber.pbData : NULL);
return ret;
}
/* Warning: assumes pvStructInfo is a struct GenericArray whose rgItems has
* been set prior to calling.
*/
static BOOL WINAPI CRYPT_AsnDecodeCRLEntries(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
CRYPT_AsnDecodeCRLEntry, sizeof(CRL_ENTRY), TRUE,
offsetof(CRL_ENTRY, SerialNumber.pbData) };
struct GenericArray *entries = (struct GenericArray *)pvStructInfo;
TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo,
entries ? entries->rgItems : NULL);
TRACE("Returning %d (%08lx)\n", ret, GetLastError());
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeCRLInfo(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
__TRY
{
struct AsnDecodeSequenceItem items[] = {
{ ASN_CONTEXT | ASN_CONSTRUCTOR, offsetof(CRL_INFO, dwVersion),
CRYPT_AsnDecodeCertVersion, sizeof(DWORD), TRUE, FALSE, 0, 0 },
{ ASN_SEQUENCEOF, offsetof(CRL_INFO, SignatureAlgorithm),
CRYPT_AsnDecodeAlgorithmId, sizeof(CRYPT_ALGORITHM_IDENTIFIER),
FALSE, TRUE, offsetof(CRL_INFO, SignatureAlgorithm.pszObjId), 0 },
{ 0, offsetof(CRL_INFO, Issuer), CRYPT_AsnDecodeDerBlob,
sizeof(CRYPT_DER_BLOB), FALSE, TRUE, offsetof(CRL_INFO,
Issuer.pbData) },
{ 0, offsetof(CRL_INFO, ThisUpdate), CRYPT_AsnDecodeChoiceOfTime,
sizeof(FILETIME), FALSE, FALSE, 0 },
{ 0, offsetof(CRL_INFO, NextUpdate), CRYPT_AsnDecodeChoiceOfTime,
sizeof(FILETIME), TRUE, FALSE, 0 },
{ ASN_SEQUENCEOF, offsetof(CRL_INFO, cCRLEntry),
CRYPT_AsnDecodeCRLEntries, sizeof(struct GenericArray), TRUE, TRUE,
offsetof(CRL_INFO, rgCRLEntry), 0 },
/* Note that the extensions are ignored by MS, so I'll ignore them too
*/
{ 0, offsetof(CRL_INFO, cExtension), NULL,
sizeof(CERT_EXTENSIONS), TRUE, FALSE, 0 },
};
ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, NULL);
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
TRACE("Returning %d (%08lx)\n", ret, GetLastError());
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeOidInternal(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
if (pbEncoded[0] == ASN_OBJECTIDENTIFIER)
{
DWORD dataLen;
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
DWORD bytesNeeded = sizeof(LPSTR);
if (dataLen)
{
/* The largest possible string for the first two components
* is 2.175 (= 2 * 40 + 175 = 255), so this is big enough.
*/
char firstTwo[6];
const BYTE *ptr;
snprintf(firstTwo, sizeof(firstTwo), "%d.%d",
pbEncoded[1 + lenBytes] / 40,
pbEncoded[1 + lenBytes] - (pbEncoded[1 + lenBytes] / 40)
* 40);
bytesNeeded += strlen(firstTwo) + 1;
for (ptr = pbEncoded + 2 + lenBytes; ret &&
ptr - pbEncoded - 1 - lenBytes < dataLen; )
{
/* large enough for ".4000000" */
char str[9];
int val = 0;
while (ptr - pbEncoded - 1 - lenBytes < dataLen &&
(*ptr & 0x80))
{
val <<= 7;
val |= *ptr & 0x7f;
ptr++;
}
if (ptr - pbEncoded - 1 - lenBytes >= dataLen ||
(*ptr & 0x80))
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
else
{
val <<= 7;
val |= *ptr++;
snprintf(str, sizeof(str), ".%d", val);
bytesNeeded += strlen(str);
}
}
}
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
if (dataLen)
{
const BYTE *ptr;
LPSTR pszObjId = *(LPSTR *)pvStructInfo;
*pszObjId = 0;
sprintf(pszObjId, "%d.%d", pbEncoded[1 + lenBytes] / 40,
pbEncoded[1 + lenBytes] - (pbEncoded[1 + lenBytes] /
40) * 40);
pszObjId += strlen(pszObjId);
for (ptr = pbEncoded + 2 + lenBytes; ret &&
ptr - pbEncoded - 1 - lenBytes < dataLen; )
{
int val = 0;
while (ptr - pbEncoded - 1 - lenBytes < dataLen &&
(*ptr & 0x80))
{
val <<= 7;
val |= *ptr & 0x7f;
ptr++;
}
val <<= 7;
val |= *ptr++;
sprintf(pszObjId, ".%d", val);
pszObjId += strlen(pszObjId);
}
}
else
*(LPSTR *)pvStructInfo = NULL;
*pcbStructInfo = bytesNeeded;
}
}
}
return ret;
}
/* Warning: assumes pvStructInfo is a CERT_EXTENSION whose pszObjId is set
* ahead of time!
*/
static BOOL WINAPI CRYPT_AsnDecodeExtension(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
struct AsnDecodeSequenceItem items[] = {
{ ASN_OBJECTIDENTIFIER, offsetof(CERT_EXTENSION, pszObjId),
CRYPT_AsnDecodeOidInternal, sizeof(LPSTR), FALSE, TRUE,
offsetof(CERT_EXTENSION, pszObjId), 0 },
{ ASN_BOOL, offsetof(CERT_EXTENSION, fCritical), CRYPT_AsnDecodeBool,
sizeof(BOOL), TRUE, FALSE, 0, 0 },
{ ASN_OCTETSTRING, offsetof(CERT_EXTENSION, Value),
CRYPT_AsnDecodeOctetsInternal, sizeof(CRYPT_OBJID_BLOB), FALSE, TRUE,
offsetof(CERT_EXTENSION, Value.pbData) },
};
BOOL ret = TRUE;
PCERT_EXTENSION ext = (PCERT_EXTENSION)pvStructInfo;
TRACE("%p, %ld, %08lx, %p, %ld\n", pbEncoded, cbEncoded, dwFlags, ext,
*pcbStructInfo);
if (ext)
TRACE("ext->pszObjId is %p\n", ext->pszObjId);
ret = CRYPT_AsnDecodeSequence(X509_ASN_ENCODING, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags, NULL,
ext, pcbStructInfo, ext ? ext->pszObjId : NULL);
if (ext)
TRACE("ext->pszObjId is %p (%s)\n", ext->pszObjId,
debugstr_a(ext->pszObjId));
TRACE("returning %d (%08lx)\n", ret, GetLastError());
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeExtensionsInternal(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
CRYPT_AsnDecodeExtension, sizeof(CERT_EXTENSION), TRUE,
offsetof(CERT_EXTENSION, pszObjId) };
PCERT_EXTENSIONS exts = (PCERT_EXTENSIONS)pvStructInfo;
TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, exts ? exts->rgExtension : NULL);
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeExtensions(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
__TRY
{
ret = CRYPT_AsnDecodeExtensionsInternal(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, NULL, pcbStructInfo);
if (ret && pvStructInfo)
{
ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara, pvStructInfo,
pcbStructInfo, *pcbStructInfo);
if (ret)
{
CERT_EXTENSIONS *exts;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
exts = (CERT_EXTENSIONS *)pvStructInfo;
exts->rgExtension = (CERT_EXTENSION *)((BYTE *)exts +
sizeof(CERT_EXTENSIONS));
ret = CRYPT_AsnDecodeExtensionsInternal(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, pvStructInfo,
pcbStructInfo);
}
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
/* Warning: this assumes the address of value->Value.pbData is already set, in
* order to avoid overwriting memory. (In some cases, it may change it, if it
* doesn't copy anything to memory.) Be sure to set it correctly!
*/
static BOOL WINAPI CRYPT_AsnDecodeNameValue(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
__TRY
{
DWORD dataLen;
CERT_NAME_VALUE *value = (CERT_NAME_VALUE *)pvStructInfo;
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
switch (pbEncoded[0])
{
case ASN_NUMERICSTRING:
case ASN_PRINTABLESTRING:
case ASN_IA5STRING:
break;
default:
FIXME("Unimplemented string type %02x\n", pbEncoded[0]);
SetLastError(OSS_UNIMPLEMENTED);
ret = FALSE;
}
if (ret)
{
DWORD bytesNeeded = sizeof(CERT_NAME_VALUE);
switch (pbEncoded[0])
{
case ASN_NUMERICSTRING:
case ASN_PRINTABLESTRING:
case ASN_IA5STRING:
if (!(dwFlags & CRYPT_DECODE_NOCOPY_FLAG))
bytesNeeded += dataLen;
break;
}
if (!value)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
*pcbStructInfo = bytesNeeded;
switch (pbEncoded[0])
{
case ASN_NUMERICSTRING:
value->dwValueType = CERT_RDN_NUMERIC_STRING;
break;
case ASN_PRINTABLESTRING:
value->dwValueType = CERT_RDN_PRINTABLE_STRING;
break;
case ASN_IA5STRING:
value->dwValueType = CERT_RDN_IA5_STRING;
break;
}
if (dataLen)
{
switch (pbEncoded[0])
{
case ASN_NUMERICSTRING:
case ASN_PRINTABLESTRING:
case ASN_IA5STRING:
value->Value.cbData = dataLen;
if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
value->Value.pbData = (BYTE *)pbEncoded + 1 +
lenBytes;
else
{
assert(value->Value.pbData);
memcpy(value->Value.pbData,
pbEncoded + 1 + lenBytes, dataLen);
}
break;
}
}
else
{
value->Value.cbData = 0;
value->Value.pbData = NULL;
}
}
}
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeRdnAttr(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
TRACE("%p, %ld, %08lx, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pvStructInfo, *pcbStructInfo);
__TRY
{
struct AsnDecodeSequenceItem items[] = {
{ ASN_OBJECTIDENTIFIER, offsetof(CERT_RDN_ATTR, pszObjId),
CRYPT_AsnDecodeOidInternal, sizeof(LPSTR), FALSE, TRUE,
offsetof(CERT_RDN_ATTR, pszObjId), 0 },
{ 0, offsetof(CERT_RDN_ATTR, dwValueType), CRYPT_AsnDecodeNameValue,
sizeof(CERT_NAME_VALUE), FALSE, TRUE, offsetof(CERT_RDN_ATTR,
Value.pbData), 0 },
};
CERT_RDN_ATTR *attr = (CERT_RDN_ATTR *)pvStructInfo;
if (attr)
TRACE("attr->pszObjId is %p\n", attr->pszObjId);
ret = CRYPT_AsnDecodeSequence(X509_ASN_ENCODING, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags, NULL,
attr, pcbStructInfo, attr ? attr->pszObjId : NULL);
if (attr)
{
TRACE("attr->pszObjId is %p (%s)\n", attr->pszObjId,
debugstr_a(attr->pszObjId));
TRACE("attr->dwValueType is %ld\n", attr->dwValueType);
}
TRACE("returning %d (%08lx)\n", ret, GetLastError());
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeRdn(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
__TRY
{
struct AsnArrayDescriptor arrayDesc = { ASN_CONSTRUCTOR | ASN_SETOF,
CRYPT_AsnDecodeRdnAttr, sizeof(CERT_RDN_ATTR), TRUE,
offsetof(CERT_RDN_ATTR, pszObjId) };
PCERT_RDN rdn = (PCERT_RDN)pvStructInfo;
ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, rdn ? rdn->rgRDNAttr : NULL);
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeName(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
__TRY
{
struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
CRYPT_AsnDecodeRdn, sizeof(CERT_RDN), TRUE,
offsetof(CERT_RDN, rgRDNAttr) };
ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, NULL);
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeCopyBytes(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
DWORD bytesNeeded = sizeof(CRYPT_OBJID_BLOB);
TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
if (!(dwFlags & CRYPT_DECODE_NOCOPY_FLAG))
bytesNeeded += cbEncoded;
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
SetLastError(ERROR_MORE_DATA);
*pcbStructInfo = bytesNeeded;
ret = FALSE;
}
else
{
PCRYPT_OBJID_BLOB blob = (PCRYPT_OBJID_BLOB)pvStructInfo;
*pcbStructInfo = bytesNeeded;
blob->cbData = cbEncoded;
if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
blob->pbData = (LPBYTE)pbEncoded;
else
{
assert(blob->pbData);
memcpy(blob->pbData, pbEncoded, blob->cbData);
}
}
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeAlgorithmId(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
CRYPT_ALGORITHM_IDENTIFIER *algo =
(CRYPT_ALGORITHM_IDENTIFIER *)pvStructInfo;
BOOL ret = TRUE;
struct AsnDecodeSequenceItem items[] = {
{ ASN_OBJECTIDENTIFIER, offsetof(CRYPT_ALGORITHM_IDENTIFIER, pszObjId),
CRYPT_AsnDecodeOidInternal, sizeof(LPSTR), FALSE, TRUE,
offsetof(CRYPT_ALGORITHM_IDENTIFIER, pszObjId), 0 },
{ 0, offsetof(CRYPT_ALGORITHM_IDENTIFIER, Parameters),
CRYPT_AsnDecodeCopyBytes, sizeof(CRYPT_OBJID_BLOB), TRUE, TRUE,
offsetof(CRYPT_ALGORITHM_IDENTIFIER, Parameters.pbData), 0 },
};
TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, algo ? algo->pszObjId : NULL);
if (ret && pvStructInfo)
{
TRACE("pszObjId is %p (%s)\n", algo->pszObjId,
debugstr_a(algo->pszObjId));
}
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodePubKeyInfoInternal(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
struct AsnDecodeSequenceItem items[] = {
{ ASN_SEQUENCEOF, offsetof(CERT_PUBLIC_KEY_INFO, Algorithm),
CRYPT_AsnDecodeAlgorithmId, sizeof(CRYPT_ALGORITHM_IDENTIFIER),
FALSE, TRUE, offsetof(CERT_PUBLIC_KEY_INFO,
Algorithm.pszObjId) },
{ ASN_BITSTRING, offsetof(CERT_PUBLIC_KEY_INFO, PublicKey),
CRYPT_AsnDecodeBitsInternal, sizeof(CRYPT_BIT_BLOB), FALSE, TRUE,
offsetof(CERT_PUBLIC_KEY_INFO, PublicKey.pbData) },
};
PCERT_PUBLIC_KEY_INFO info = (PCERT_PUBLIC_KEY_INFO)pvStructInfo;
ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, info ?
info->Algorithm.Parameters.pbData : NULL);
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodePubKeyInfo(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
__TRY
{
DWORD bytesNeeded;
if ((ret = CRYPT_AsnDecodePubKeyInfoInternal(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, NULL, &bytesNeeded)))
{
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
pvStructInfo, pcbStructInfo, bytesNeeded)))
{
PCERT_PUBLIC_KEY_INFO info;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
info = (PCERT_PUBLIC_KEY_INFO)pvStructInfo;
info->Algorithm.Parameters.pbData = (BYTE *)pvStructInfo +
sizeof(CERT_PUBLIC_KEY_INFO);
ret = CRYPT_AsnDecodePubKeyInfoInternal(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, pvStructInfo,
&bytesNeeded);
}
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeBool(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
if (cbEncoded < 3)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
return FALSE;
}
if (GET_LEN_BYTES(pbEncoded[1]) > 1)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
return FALSE;
}
if (pbEncoded[1] > 1)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
return FALSE;
}
if (!pvStructInfo)
{
*pcbStructInfo = sizeof(BOOL);
ret = TRUE;
}
else if (*pcbStructInfo < sizeof(BOOL))
{
*pcbStructInfo = sizeof(BOOL);
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
*(BOOL *)pvStructInfo = pbEncoded[2] ? TRUE : FALSE;
ret = TRUE;
}
TRACE("returning %d (%08lx)\n", ret, GetLastError());
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeAltNameEntry(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
PCERT_ALT_NAME_ENTRY entry = (PCERT_ALT_NAME_ENTRY)pvStructInfo;
DWORD dataLen, lenBytes, bytesNeeded = sizeof(CERT_ALT_NAME_ENTRY);
BOOL ret;
TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
if (cbEncoded < 2)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
return FALSE;
}
if ((pbEncoded[0] & ASN_FLAGS_MASK) != ASN_CONTEXT)
{
SetLastError(CRYPT_E_ASN1_BADTAG);
return FALSE;
}
lenBytes = GET_LEN_BYTES(pbEncoded[1]);
if (1 + lenBytes > cbEncoded)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
return FALSE;
}
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
switch (pbEncoded[0] & ASN_TYPE_MASK)
{
case 1: /* rfc822Name */
case 2: /* dNSName */
case 6: /* uniformResourceIdentifier */
bytesNeeded += (dataLen + 1) * sizeof(WCHAR);
break;
case 7: /* iPAddress */
bytesNeeded += dataLen;
break;
case 8: /* registeredID */
/* FIXME: decode as OID */
case 0: /* otherName */
case 4: /* directoryName */
FIXME("stub\n");
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
break;
case 3: /* x400Address, unimplemented */
case 5: /* ediPartyName, unimplemented */
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
break;
default:
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
if (ret)
{
if (!entry)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
*pcbStructInfo = bytesNeeded;
/* MS used values one greater than the asn1 ones.. sigh */
entry->dwAltNameChoice = (pbEncoded[0] & 0x7f) + 1;
switch (pbEncoded[0] & ASN_TYPE_MASK)
{
case 1: /* rfc822Name */
case 2: /* dNSName */
case 6: /* uniformResourceIdentifier */
{
DWORD i;
for (i = 0; i < dataLen; i++)
entry->u.pwszURL[i] =
(WCHAR)pbEncoded[1 + lenBytes + i];
entry->u.pwszURL[i] = 0;
TRACE("URL is %p (%s)\n", entry->u.pwszURL,
debugstr_w(entry->u.pwszURL));
break;
}
case 7: /* iPAddress */
/* The next data pointer is in the pwszURL spot, that is,
* the first 4 bytes. Need to move it to the next spot.
*/
entry->u.IPAddress.pbData = (LPBYTE)entry->u.pwszURL;
entry->u.IPAddress.cbData = dataLen;
memcpy(entry->u.IPAddress.pbData, pbEncoded + 1 + lenBytes,
dataLen);
break;
}
}
}
}
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeAltNameInternal(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
CRYPT_AsnDecodeAltNameEntry, sizeof(CERT_ALT_NAME_ENTRY), TRUE,
offsetof(CERT_ALT_NAME_ENTRY, u.pwszURL) };
PCERT_ALT_NAME_INFO info = (PCERT_ALT_NAME_INFO)pvStructInfo;
TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
if (info)
TRACE("info->rgAltEntry is %p\n", info->rgAltEntry);
ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, info ? info->rgAltEntry : NULL);
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeAltName(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
__TRY
{
struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
CRYPT_AsnDecodeAltNameEntry, sizeof(CERT_ALT_NAME_ENTRY), TRUE,
offsetof(CERT_ALT_NAME_ENTRY, u.pwszURL) };
ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, NULL);
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
struct PATH_LEN_CONSTRAINT
{
BOOL fPathLenConstraint;
DWORD dwPathLenConstraint;
};
static BOOL WINAPI CRYPT_AsnDecodePathLenConstraint(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
TRACE("%p, %ld, %08lx, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pvStructInfo, *pcbStructInfo);
if (cbEncoded)
{
if (pbEncoded[0] == ASN_INTEGER)
{
DWORD bytesNeeded = sizeof(struct PATH_LEN_CONSTRAINT);
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
SetLastError(ERROR_MORE_DATA);
*pcbStructInfo = bytesNeeded;
ret = FALSE;
}
else
{
struct PATH_LEN_CONSTRAINT *constraint =
(struct PATH_LEN_CONSTRAINT *)pvStructInfo;
DWORD size = sizeof(constraint->dwPathLenConstraint);
ret = CRYPT_AsnDecodeInt(dwCertEncodingType, X509_INTEGER,
pbEncoded, cbEncoded, 0, NULL,
&constraint->dwPathLenConstraint, &size);
if (ret)
constraint->fPathLenConstraint = TRUE;
TRACE("got an int, dwPathLenConstraint is %ld\n",
constraint->dwPathLenConstraint);
}
}
else
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
}
TRACE("returning %d (%08lx)\n", ret, GetLastError());
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeSubtreeConstraints(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
CRYPT_AsnDecodeCopyBytes, sizeof(CERT_NAME_BLOB), TRUE,
offsetof(CERT_NAME_BLOB, pbData) };
struct GenericArray *entries = (struct GenericArray *)pvStructInfo;
TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo,
entries ? entries->rgItems : NULL);
TRACE("Returning %d (%08lx)\n", ret, GetLastError());
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeBasicConstraints(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
__TRY
{
struct AsnDecodeSequenceItem items[] = {
{ ASN_BITSTRING, offsetof(CERT_BASIC_CONSTRAINTS_INFO, SubjectType),
CRYPT_AsnDecodeBitsInternal, sizeof(CRYPT_BIT_BLOB), FALSE, TRUE,
offsetof(CERT_BASIC_CONSTRAINTS_INFO, SubjectType.pbData), 0 },
{ ASN_INTEGER, offsetof(CERT_BASIC_CONSTRAINTS_INFO,
fPathLenConstraint), CRYPT_AsnDecodePathLenConstraint,
sizeof(struct PATH_LEN_CONSTRAINT), TRUE, FALSE, 0, 0 },
{ ASN_SEQUENCEOF, offsetof(CERT_BASIC_CONSTRAINTS_INFO,
cSubtreesConstraint), CRYPT_AsnDecodeSubtreeConstraints,
sizeof(struct GenericArray), TRUE, TRUE,
offsetof(CERT_BASIC_CONSTRAINTS_INFO, rgSubtreesConstraint), 0 },
};
ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, NULL);
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeBasicConstraints2(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
__TRY
{
struct AsnDecodeSequenceItem items[] = {
{ ASN_BOOL, offsetof(CERT_BASIC_CONSTRAINTS2_INFO, fCA),
CRYPT_AsnDecodeBool, sizeof(BOOL), TRUE, FALSE, 0, 0 },
{ ASN_INTEGER, offsetof(CERT_BASIC_CONSTRAINTS2_INFO,
fPathLenConstraint), CRYPT_AsnDecodePathLenConstraint,
sizeof(struct PATH_LEN_CONSTRAINT), TRUE, FALSE, 0, 0 },
};
ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, NULL);
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
#define RSA1_MAGIC 0x31415352
struct DECODED_RSA_PUB_KEY
{
DWORD pubexp;
CRYPT_INTEGER_BLOB modulus;
};
static BOOL WINAPI CRYPT_AsnDecodeRsaPubKey(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
__TRY
{
struct AsnDecodeSequenceItem items[] = {
{ ASN_INTEGER, offsetof(struct DECODED_RSA_PUB_KEY, modulus),
CRYPT_AsnDecodeUnsignedIntegerInternal, sizeof(CRYPT_INTEGER_BLOB),
FALSE, TRUE, offsetof(struct DECODED_RSA_PUB_KEY, modulus.pbData),
0 },
{ ASN_INTEGER, offsetof(struct DECODED_RSA_PUB_KEY, pubexp),
CRYPT_AsnDecodeInt, sizeof(DWORD), FALSE, FALSE, 0, 0 },
};
struct DECODED_RSA_PUB_KEY *decodedKey = NULL;
DWORD size = 0;
ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded,
CRYPT_DECODE_ALLOC_FLAG, NULL, &decodedKey, &size, NULL);
if (ret)
{
DWORD bytesNeeded = sizeof(BLOBHEADER) + sizeof(RSAPUBKEY) +
decodedKey->modulus.cbData;
if (!pvStructInfo)
{
*pcbStructInfo = bytesNeeded;
ret = TRUE;
}
else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
pvStructInfo, pcbStructInfo, bytesNeeded)))
{
BLOBHEADER *hdr;
RSAPUBKEY *rsaPubKey;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
hdr = (BLOBHEADER *)pvStructInfo;
hdr->bType = PUBLICKEYBLOB;
hdr->bVersion = CUR_BLOB_VERSION;
hdr->reserved = 0;
hdr->aiKeyAlg = CALG_RSA_KEYX;
rsaPubKey = (RSAPUBKEY *)((BYTE *)pvStructInfo +
sizeof(BLOBHEADER));
rsaPubKey->magic = RSA1_MAGIC;
rsaPubKey->pubexp = decodedKey->pubexp;
rsaPubKey->bitlen = decodedKey->modulus.cbData * 8;
memcpy((BYTE *)pvStructInfo + sizeof(BLOBHEADER) +
sizeof(RSAPUBKEY), decodedKey->modulus.pbData,
decodedKey->modulus.cbData);
}
LocalFree(decodedKey);
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeOctetsInternal(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
DWORD bytesNeeded, dataLen;
TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
bytesNeeded = sizeof(CRYPT_DATA_BLOB);
else
bytesNeeded = dataLen + sizeof(CRYPT_DATA_BLOB);
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
SetLastError(ERROR_MORE_DATA);
*pcbStructInfo = bytesNeeded;
ret = FALSE;
}
else
{
CRYPT_DATA_BLOB *blob;
BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
blob = (CRYPT_DATA_BLOB *)pvStructInfo;
blob->cbData = dataLen;
if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
blob->pbData = (BYTE *)pbEncoded + 1 + lenBytes;
else
{
assert(blob->pbData);
if (blob->cbData)
memcpy(blob->pbData, pbEncoded + 1 + lenBytes,
blob->cbData);
}
}
}
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeOctets(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
__TRY
{
DWORD bytesNeeded;
if (!cbEncoded)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
else if (pbEncoded[0] != ASN_OCTETSTRING)
{
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
else if ((ret = CRYPT_AsnDecodeOctetsInternal(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, NULL, &bytesNeeded)))
{
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
pvStructInfo, pcbStructInfo, bytesNeeded)))
{
CRYPT_DATA_BLOB *blob;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
blob = (CRYPT_DATA_BLOB *)pvStructInfo;
blob->pbData = (BYTE *)pvStructInfo + sizeof(CRYPT_DATA_BLOB);
ret = CRYPT_AsnDecodeOctetsInternal(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, pvStructInfo,
&bytesNeeded);
}
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeBitsInternal(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
TRACE("(%p, %ld, 0x%08lx, %p, %p, %ld)\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
if (pbEncoded[0] == ASN_BITSTRING)
{
DWORD bytesNeeded, dataLen;
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
bytesNeeded = sizeof(CRYPT_BIT_BLOB);
else
bytesNeeded = dataLen - 1 + sizeof(CRYPT_BIT_BLOB);
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
CRYPT_BIT_BLOB *blob;
blob = (CRYPT_BIT_BLOB *)pvStructInfo;
blob->cbData = dataLen - 1;
blob->cUnusedBits = *(pbEncoded + 1 +
GET_LEN_BYTES(pbEncoded[1]));
if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
{
blob->pbData = (BYTE *)pbEncoded + 2 +
GET_LEN_BYTES(pbEncoded[1]);
}
else
{
assert(blob->pbData);
if (blob->cbData)
{
BYTE mask = 0xff << blob->cUnusedBits;
memcpy(blob->pbData, pbEncoded + 2 +
GET_LEN_BYTES(pbEncoded[1]), blob->cbData);
blob->pbData[blob->cbData - 1] &= mask;
}
}
}
}
}
else
{
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
TRACE("returning %d (%08lx)\n", ret, GetLastError());
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeBits(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
TRACE("(%p, %ld, 0x%08lx, %p, %p, %p)\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo);
__TRY
{
DWORD bytesNeeded;
if ((ret = CRYPT_AsnDecodeBitsInternal(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, NULL, &bytesNeeded)))
{
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
pvStructInfo, pcbStructInfo, bytesNeeded)))
{
CRYPT_BIT_BLOB *blob;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
blob = (CRYPT_BIT_BLOB *)pvStructInfo;
blob->pbData = (BYTE *)pvStructInfo + sizeof(CRYPT_BIT_BLOB);
ret = CRYPT_AsnDecodeBitsInternal(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG, NULL, pvStructInfo,
&bytesNeeded);
}
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
TRACE("returning %d (%08lx)\n", ret, GetLastError());
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeInt(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
if (!pvStructInfo)
{
*pcbStructInfo = sizeof(int);
return TRUE;
}
__TRY
{
BYTE buf[sizeof(CRYPT_INTEGER_BLOB) + sizeof(int)];
CRYPT_INTEGER_BLOB *blob = (CRYPT_INTEGER_BLOB *)buf;
DWORD size = sizeof(buf);
blob->pbData = buf + sizeof(CRYPT_INTEGER_BLOB);
ret = CRYPT_AsnDecodeIntegerInternal(dwCertEncodingType,
X509_MULTI_BYTE_INTEGER, pbEncoded, cbEncoded, 0, NULL, &buf, &size);
if (ret)
{
if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
pvStructInfo, pcbStructInfo, sizeof(int))))
{
int val, i;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
if (blob->pbData[blob->cbData - 1] & 0x80)
{
/* initialize to a negative value to sign-extend */
val = -1;
}
else
val = 0;
for (i = 0; i < blob->cbData; i++)
{
val <<= 8;
val |= blob->pbData[blob->cbData - i - 1];
}
memcpy(pvStructInfo, &val, sizeof(int));
}
}
else if (GetLastError() == ERROR_MORE_DATA)
SetLastError(CRYPT_E_ASN1_LARGE);
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeIntegerInternal(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
if (pbEncoded[0] == ASN_INTEGER)
{
DWORD bytesNeeded, dataLen;
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
bytesNeeded = dataLen + sizeof(CRYPT_INTEGER_BLOB);
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
CRYPT_INTEGER_BLOB *blob = (CRYPT_INTEGER_BLOB *)pvStructInfo;
blob->cbData = dataLen;
assert(blob->pbData);
if (blob->cbData)
{
DWORD i;
for (i = 0; i < blob->cbData; i++)
{
blob->pbData[i] = *(pbEncoded + 1 + lenBytes +
dataLen - i - 1);
}
}
}
}
}
else
{
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeInteger(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
__TRY
{
DWORD bytesNeeded;
if ((ret = CRYPT_AsnDecodeIntegerInternal(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded,
dwFlags & ~CRYPT_ENCODE_ALLOC_FLAG, NULL, NULL, &bytesNeeded)))
{
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
pvStructInfo, pcbStructInfo, bytesNeeded)))
{
CRYPT_INTEGER_BLOB *blob;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
blob = (CRYPT_INTEGER_BLOB *)pvStructInfo;
blob->pbData = (BYTE *)pvStructInfo +
sizeof(CRYPT_INTEGER_BLOB);
ret = CRYPT_AsnDecodeIntegerInternal(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded,
dwFlags & ~CRYPT_ENCODE_ALLOC_FLAG, NULL, pvStructInfo,
&bytesNeeded);
}
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeUnsignedIntegerInternal(
DWORD dwCertEncodingType, LPCSTR lpszStructType, const BYTE *pbEncoded,
DWORD cbEncoded, DWORD dwFlags, PCRYPT_DECODE_PARA pDecodePara,
void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
if (pbEncoded[0] == ASN_INTEGER)
{
DWORD bytesNeeded, dataLen;
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
bytesNeeded = dataLen + sizeof(CRYPT_INTEGER_BLOB);
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
CRYPT_INTEGER_BLOB *blob = (CRYPT_INTEGER_BLOB *)pvStructInfo;
blob->cbData = dataLen;
assert(blob->pbData);
/* remove leading zero byte if it exists */
if (blob->cbData && *(pbEncoded + 1 + lenBytes) == 0)
{
blob->cbData--;
blob->pbData++;
}
if (blob->cbData)
{
DWORD i;
for (i = 0; i < blob->cbData; i++)
{
blob->pbData[i] = *(pbEncoded + 1 + lenBytes +
dataLen - i - 1);
}
}
}
}
}
else
{
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeUnsignedInteger(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
__TRY
{
DWORD bytesNeeded;
if ((ret = CRYPT_AsnDecodeUnsignedIntegerInternal(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded,
dwFlags & ~CRYPT_ENCODE_ALLOC_FLAG, NULL, NULL, &bytesNeeded)))
{
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
pvStructInfo, pcbStructInfo, bytesNeeded)))
{
CRYPT_INTEGER_BLOB *blob;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
blob = (CRYPT_INTEGER_BLOB *)pvStructInfo;
blob->pbData = (BYTE *)pvStructInfo +
sizeof(CRYPT_INTEGER_BLOB);
ret = CRYPT_AsnDecodeUnsignedIntegerInternal(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded,
dwFlags & ~CRYPT_ENCODE_ALLOC_FLAG, NULL, pvStructInfo,
&bytesNeeded);
}
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeEnumerated(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
if (!pvStructInfo)
{
*pcbStructInfo = sizeof(int);
return TRUE;
}
__TRY
{
if (pbEncoded[0] == ASN_ENUMERATED)
{
unsigned int val = 0, i;
if (cbEncoded <= 1)
{
SetLastError(CRYPT_E_ASN1_EOD);
ret = FALSE;
}
else if (pbEncoded[1] == 0)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
else
{
/* A little strange looking, but we have to accept a sign byte:
* 0xffffffff gets encoded as 0a 05 00 ff ff ff ff. Also,
* assuming a small length is okay here, it has to be in short
* form.
*/
if (pbEncoded[1] > sizeof(unsigned int) + 1)
{
SetLastError(CRYPT_E_ASN1_LARGE);
return FALSE;
}
for (i = 0; i < pbEncoded[1]; i++)
{
val <<= 8;
val |= pbEncoded[2 + i];
}
if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
pvStructInfo, pcbStructInfo, sizeof(unsigned int))))
{
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
memcpy(pvStructInfo, &val, sizeof(unsigned int));
}
}
}
else
{
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
/* Modifies word, pbEncoded, and len, and magically sets a value ret to FALSE
* if it fails.
*/
#define CRYPT_TIME_GET_DIGITS(pbEncoded, len, numDigits, word) \
do { \
BYTE i; \
\
(word) = 0; \
for (i = 0; (len) > 0 && i < (numDigits); i++, (len)--) \
{ \
if (!isdigit(*(pbEncoded))) \
{ \
SetLastError(CRYPT_E_ASN1_CORRUPT); \
ret = FALSE; \
} \
else \
{ \
(word) *= 10; \
(word) += *(pbEncoded)++ - '0'; \
} \
} \
} while (0)
static BOOL CRYPT_AsnDecodeTimeZone(const BYTE *pbEncoded, DWORD len,
SYSTEMTIME *sysTime)
{
BOOL ret;
__TRY
{
ret = TRUE;
if (len >= 3 && (*pbEncoded == '+' || *pbEncoded == '-'))
{
WORD hours, minutes = 0;
BYTE sign = *pbEncoded++;
len--;
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, hours);
if (ret && hours >= 24)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
else if (len >= 2)
{
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, minutes);
if (ret && minutes >= 60)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
}
if (ret)
{
if (sign == '+')
{
sysTime->wHour += hours;
sysTime->wMinute += minutes;
}
else
{
if (hours > sysTime->wHour)
{
sysTime->wDay--;
sysTime->wHour = 24 - (hours - sysTime->wHour);
}
else
sysTime->wHour -= hours;
if (minutes > sysTime->wMinute)
{
sysTime->wHour--;
sysTime->wMinute = 60 - (minutes - sysTime->wMinute);
}
else
sysTime->wMinute -= minutes;
}
}
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
#define MIN_ENCODED_TIME_LENGTH 10
static BOOL WINAPI CRYPT_AsnDecodeUtcTime(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
if (!pvStructInfo)
{
*pcbStructInfo = sizeof(FILETIME);
return TRUE;
}
__TRY
{
ret = TRUE;
if (pbEncoded[0] == ASN_UTCTIME)
{
if (cbEncoded <= 1)
{
SetLastError(CRYPT_E_ASN1_EOD);
ret = FALSE;
}
else if (pbEncoded[1] > 0x7f)
{
/* long-form date strings really can't be valid */
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
else
{
SYSTEMTIME sysTime = { 0 };
BYTE len = pbEncoded[1];
if (len < MIN_ENCODED_TIME_LENGTH)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
else
{
pbEncoded += 2;
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wYear);
if (sysTime.wYear >= 50)
sysTime.wYear += 1900;
else
sysTime.wYear += 2000;
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wMonth);
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wDay);
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wHour);
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wMinute);
if (ret && len > 0)
{
if (len >= 2 && isdigit(*pbEncoded) &&
isdigit(*(pbEncoded + 1)))
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2,
sysTime.wSecond);
else if (isdigit(*pbEncoded))
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 1,
sysTime.wSecond);
if (ret)
ret = CRYPT_AsnDecodeTimeZone(pbEncoded, len,
&sysTime);
}
if (ret && (ret = CRYPT_DecodeEnsureSpace(dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo,
sizeof(FILETIME))))
{
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
ret = SystemTimeToFileTime(&sysTime,
(FILETIME *)pvStructInfo);
}
}
}
}
else
{
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeGeneralizedTime(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
if (!pvStructInfo)
{
*pcbStructInfo = sizeof(FILETIME);
return TRUE;
}
__TRY
{
ret = TRUE;
if (pbEncoded[0] == ASN_GENERALTIME)
{
if (cbEncoded <= 1)
{
SetLastError(CRYPT_E_ASN1_EOD);
ret = FALSE;
}
else if (pbEncoded[1] > 0x7f)
{
/* long-form date strings really can't be valid */
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
else
{
BYTE len = pbEncoded[1];
if (len < MIN_ENCODED_TIME_LENGTH)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
else
{
SYSTEMTIME sysTime = { 0 };
pbEncoded += 2;
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 4, sysTime.wYear);
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wMonth);
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wDay);
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wHour);
if (ret && len > 0)
{
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2,
sysTime.wMinute);
if (ret && len > 0)
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2,
sysTime.wSecond);
if (ret && len > 0 && (*pbEncoded == '.' ||
*pbEncoded == ','))
{
BYTE digits;
pbEncoded++;
len--;
/* workaround macro weirdness */
digits = min(len, 3);
CRYPT_TIME_GET_DIGITS(pbEncoded, len, digits,
sysTime.wMilliseconds);
}
if (ret)
ret = CRYPT_AsnDecodeTimeZone(pbEncoded, len,
&sysTime);
}
if (ret && (ret = CRYPT_DecodeEnsureSpace(dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo,
sizeof(FILETIME))))
{
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
ret = SystemTimeToFileTime(&sysTime,
(FILETIME *)pvStructInfo);
}
}
}
}
else
{
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeChoiceOfTime(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
__TRY
{
if (pbEncoded[0] == ASN_UTCTIME)
ret = CRYPT_AsnDecodeUtcTime(dwCertEncodingType, lpszStructType,
pbEncoded, cbEncoded, dwFlags, pDecodePara, pvStructInfo,
pcbStructInfo);
else if (pbEncoded[0] == ASN_GENERALTIME)
ret = CRYPT_AsnDecodeGeneralizedTime(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded, dwFlags, pDecodePara,
pvStructInfo, pcbStructInfo);
else
{
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeSequenceOfAny(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
__TRY
{
if (pbEncoded[0] == ASN_SEQUENCEOF)
{
DWORD bytesNeeded, dataLen, remainingLen, cValue;
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
BYTE lenBytes;
const BYTE *ptr;
lenBytes = GET_LEN_BYTES(pbEncoded[1]);
bytesNeeded = sizeof(CRYPT_SEQUENCE_OF_ANY);
cValue = 0;
ptr = pbEncoded + 1 + lenBytes;
remainingLen = dataLen;
while (ret && remainingLen)
{
DWORD nextLen;
ret = CRYPT_GetLen(ptr, remainingLen, &nextLen);
if (ret)
{
DWORD nextLenBytes = GET_LEN_BYTES(ptr[1]);
remainingLen -= 1 + nextLenBytes + nextLen;
ptr += 1 + nextLenBytes + nextLen;
bytesNeeded += sizeof(CRYPT_DER_BLOB);
if (!(dwFlags & CRYPT_DECODE_NOCOPY_FLAG))
bytesNeeded += 1 + nextLenBytes + nextLen;
cValue++;
}
}
if (ret)
{
CRYPT_SEQUENCE_OF_ANY *seq;
BYTE *nextPtr;
DWORD i;
if ((ret = CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara,
pvStructInfo, pcbStructInfo, bytesNeeded)))
{
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
seq = (CRYPT_SEQUENCE_OF_ANY *)pvStructInfo;
seq->cValue = cValue;
seq->rgValue = (CRYPT_DER_BLOB *)((BYTE *)seq +
sizeof(*seq));
nextPtr = (BYTE *)seq->rgValue +
cValue * sizeof(CRYPT_DER_BLOB);
ptr = pbEncoded + 1 + lenBytes;
remainingLen = dataLen;
i = 0;
while (ret && remainingLen)
{
DWORD nextLen;
ret = CRYPT_GetLen(ptr, remainingLen, &nextLen);
if (ret)
{
DWORD nextLenBytes = GET_LEN_BYTES(ptr[1]);
seq->rgValue[i].cbData = 1 + nextLenBytes +
nextLen;
if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
seq->rgValue[i].pbData = (BYTE *)ptr;
else
{
seq->rgValue[i].pbData = nextPtr;
memcpy(nextPtr, ptr, 1 + nextLenBytes +
nextLen);
nextPtr += 1 + nextLenBytes + nextLen;
}
remainingLen -= 1 + nextLenBytes + nextLen;
ptr += 1 + nextLenBytes + nextLen;
i++;
}
}
}
}
}
}
else
{
SetLastError(CRYPT_E_ASN1_BADTAG);
return FALSE;
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeDistPoint(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
struct AsnDecodeSequenceItem items[] = {
{ ASN_CONTEXT | ASN_CONSTRUCTOR | 0, offsetof(CRL_DIST_POINT,
DistPointName), CRYPT_AsnDecodeAltNameInternal,
sizeof(CRL_DIST_POINT_NAME), TRUE, TRUE, offsetof(CRL_DIST_POINT,
DistPointName.u.FullName.rgAltEntry), 0 },
{ ASN_CONTEXT | 1, offsetof(CRL_DIST_POINT, ReasonFlags),
CRYPT_AsnDecodeBitsInternal, sizeof(CRYPT_BIT_BLOB), TRUE, TRUE,
offsetof(CRL_DIST_POINT, ReasonFlags.pbData), 0 },
{ ASN_CONTEXT | ASN_CONSTRUCTOR | 2, offsetof(CRL_DIST_POINT, CRLIssuer),
CRYPT_AsnDecodeAltNameInternal, sizeof(CERT_ALT_NAME_INFO), TRUE, TRUE,
offsetof(CRL_DIST_POINT, CRLIssuer.rgAltEntry), 0 },
};
BOOL ret;
ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded,
dwFlags, pDecodePara, pvStructInfo, pcbStructInfo, NULL);
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeCRLDistPoints(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
__TRY
{
struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
CRYPT_AsnDecodeDistPoint, sizeof(CRL_DIST_POINT), TRUE,
offsetof(CRL_DIST_POINT, DistPointName.u.FullName.rgAltEntry) };
ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, NULL);
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeEnhancedKeyUsage(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
TRACE("%p, %ld, %08lx, %p, %p, %ld\n", pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, *pcbStructInfo);
__TRY
{
struct AsnArrayDescriptor arrayDesc = { ASN_SEQUENCEOF,
CRYPT_AsnDecodeOidInternal, sizeof(LPSTR), TRUE, 0 };
ret = CRYPT_AsnDecodeArray(&arrayDesc, pbEncoded, cbEncoded, dwFlags,
pDecodePara, pvStructInfo, pcbStructInfo, NULL);
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
__ENDTRY
return ret;
}
BOOL WINAPI CryptDecodeObjectEx(DWORD dwCertEncodingType, LPCSTR lpszStructType,
const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
static HCRYPTOIDFUNCSET set = NULL;
BOOL ret = FALSE;
CryptDecodeObjectExFunc decodeFunc = NULL;
HCRYPTOIDFUNCADDR hFunc = NULL;
TRACE("(0x%08lx, %s, %p, %ld, 0x%08lx, %p, %p, %p)\n",
dwCertEncodingType, debugstr_a(lpszStructType), pbEncoded,
cbEncoded, dwFlags, pDecodePara, pvStructInfo, pcbStructInfo);
if (!pvStructInfo && !pcbStructInfo)
{
SetLastError(ERROR_INVALID_PARAMETER);
return FALSE;
}
if ((dwCertEncodingType & CERT_ENCODING_TYPE_MASK) != X509_ASN_ENCODING
&& (dwCertEncodingType & CMSG_ENCODING_TYPE_MASK) != PKCS_7_ASN_ENCODING)
{
SetLastError(ERROR_FILE_NOT_FOUND);
return FALSE;
}
if (!cbEncoded)
{
SetLastError(CRYPT_E_ASN1_EOD);
return FALSE;
}
if (cbEncoded > MAX_ENCODED_LEN)
{
SetLastError(CRYPT_E_ASN1_LARGE);
return FALSE;
}
SetLastError(NOERROR);
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG && pvStructInfo)
*(BYTE **)pvStructInfo = NULL;
if (!HIWORD(lpszStructType))
{
switch (LOWORD(lpszStructType))
{
case (WORD)X509_CERT:
decodeFunc = CRYPT_AsnDecodeCert;
break;
case (WORD)X509_CERT_TO_BE_SIGNED:
decodeFunc = CRYPT_AsnDecodeCertInfo;
break;
case (WORD)X509_CERT_CRL_TO_BE_SIGNED:
decodeFunc = CRYPT_AsnDecodeCRLInfo;
break;
case (WORD)X509_EXTENSIONS:
decodeFunc = CRYPT_AsnDecodeExtensions;
break;
case (WORD)X509_NAME:
decodeFunc = CRYPT_AsnDecodeName;
break;
case (WORD)X509_PUBLIC_KEY_INFO:
decodeFunc = CRYPT_AsnDecodePubKeyInfo;
break;
case (WORD)X509_ALTERNATE_NAME:
decodeFunc = CRYPT_AsnDecodeAltName;
break;
case (WORD)X509_BASIC_CONSTRAINTS:
decodeFunc = CRYPT_AsnDecodeBasicConstraints;
break;
case (WORD)X509_BASIC_CONSTRAINTS2:
decodeFunc = CRYPT_AsnDecodeBasicConstraints2;
break;
case (WORD)RSA_CSP_PUBLICKEYBLOB:
decodeFunc = CRYPT_AsnDecodeRsaPubKey;
break;
case (WORD)X509_OCTET_STRING:
decodeFunc = CRYPT_AsnDecodeOctets;
break;
case (WORD)X509_BITS:
case (WORD)X509_KEY_USAGE:
decodeFunc = CRYPT_AsnDecodeBits;
break;
case (WORD)X509_INTEGER:
decodeFunc = CRYPT_AsnDecodeInt;
break;
case (WORD)X509_MULTI_BYTE_INTEGER:
decodeFunc = CRYPT_AsnDecodeInteger;
break;
case (WORD)X509_MULTI_BYTE_UINT:
decodeFunc = CRYPT_AsnDecodeUnsignedInteger;
break;
case (WORD)X509_ENUMERATED:
decodeFunc = CRYPT_AsnDecodeEnumerated;
break;
case (WORD)X509_CHOICE_OF_TIME:
decodeFunc = CRYPT_AsnDecodeChoiceOfTime;
break;
case (WORD)X509_SEQUENCE_OF_ANY:
decodeFunc = CRYPT_AsnDecodeSequenceOfAny;
break;
case (WORD)PKCS_UTC_TIME:
decodeFunc = CRYPT_AsnDecodeUtcTime;
break;
case (WORD)X509_CRL_DIST_POINTS:
decodeFunc = CRYPT_AsnDecodeCRLDistPoints;
break;
case (WORD)X509_ENHANCED_KEY_USAGE:
decodeFunc = CRYPT_AsnDecodeEnhancedKeyUsage;
break;
default:
FIXME("%d: unimplemented\n", LOWORD(lpszStructType));
}
}
else if (!strcmp(lpszStructType, szOID_CERT_EXTENSIONS))
decodeFunc = CRYPT_AsnDecodeExtensions;
else if (!strcmp(lpszStructType, szOID_RSA_signingTime))
decodeFunc = CRYPT_AsnDecodeUtcTime;
else if (!strcmp(lpszStructType, szOID_CRL_REASON_CODE))
decodeFunc = CRYPT_AsnDecodeEnumerated;
else if (!strcmp(lpszStructType, szOID_KEY_USAGE))
decodeFunc = CRYPT_AsnDecodeBits;
else if (!strcmp(lpszStructType, szOID_SUBJECT_KEY_IDENTIFIER))
decodeFunc = CRYPT_AsnDecodeOctets;
else if (!strcmp(lpszStructType, szOID_BASIC_CONSTRAINTS))
decodeFunc = CRYPT_AsnDecodeBasicConstraints;
else if (!strcmp(lpszStructType, szOID_BASIC_CONSTRAINTS2))
decodeFunc = CRYPT_AsnDecodeBasicConstraints2;
else if (!strcmp(lpszStructType, szOID_ISSUER_ALT_NAME))
decodeFunc = CRYPT_AsnDecodeAltName;
else if (!strcmp(lpszStructType, szOID_ISSUER_ALT_NAME2))
decodeFunc = CRYPT_AsnDecodeAltName;
else if (!strcmp(lpszStructType, szOID_NEXT_UPDATE_LOCATION))
decodeFunc = CRYPT_AsnDecodeAltName;
else if (!strcmp(lpszStructType, szOID_SUBJECT_ALT_NAME))
decodeFunc = CRYPT_AsnDecodeAltName;
else if (!strcmp(lpszStructType, szOID_SUBJECT_ALT_NAME2))
decodeFunc = CRYPT_AsnDecodeAltName;
else if (!strcmp(lpszStructType, szOID_CRL_DIST_POINTS))
decodeFunc = CRYPT_AsnDecodeCRLDistPoints;
else if (!strcmp(lpszStructType, szOID_ENHANCED_KEY_USAGE))
decodeFunc = CRYPT_AsnDecodeEnhancedKeyUsage;
else
TRACE("OID %s not found or unimplemented, looking for DLL\n",
debugstr_a(lpszStructType));
if (!decodeFunc)
{
if (!set)
set = CryptInitOIDFunctionSet(CRYPT_OID_DECODE_OBJECT_EX_FUNC, 0);
CryptGetOIDFunctionAddress(set, dwCertEncodingType, lpszStructType, 0,
(void **)&decodeFunc, &hFunc);
}
if (decodeFunc)
ret = decodeFunc(dwCertEncodingType, lpszStructType, pbEncoded,
cbEncoded, dwFlags, pDecodePara, pvStructInfo, pcbStructInfo);
else
SetLastError(ERROR_FILE_NOT_FOUND);
if (hFunc)
CryptFreeOIDFunctionAddress(hFunc, 0);
return ret;
}
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