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Implement asn.1 decoding of integers, with tests.

This commit is contained in:
Juan Lang 2005-06-04 09:49:33 +00:00 committed by Alexandre Julliard
parent eaef08415d
commit 054a8fb604
2 changed files with 146 additions and 10 deletions
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76
dlls/crypt32/encode.c
View File

@ -482,6 +482,77 @@ BOOL WINAPI CryptDecodeObject(DWORD dwCertEncodingType, LPCSTR lpszStructType,
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)
{
int val, i;
BOOL ret;
if (!pbEncoded || !cbEncoded)
{
SetLastError(ERROR_INVALID_PARAMETER);
return FALSE;
}
if (!pvStructInfo)
{
*pcbStructInfo = sizeof(int);
SetLastError(ERROR_MORE_DATA);
return FALSE;
}
if (pbEncoded[0] != ASN_INTEGER)
{
SetLastError(CRYPT_E_ASN1_BADTAG);
return FALSE;
}
if (pbEncoded[1] == 0)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
return FALSE;
}
if (pbEncoded[1] > sizeof(int))
{
SetLastError(CRYPT_E_ASN1_LARGE);
return FALSE;
}
if (pbEncoded[2] & 0x80)
{
/* initialize to a negative value to sign-extend */
val = -1;
}
else
val = 0;
for (i = 0; i < pbEncoded[1]; i++)
{
val <<= 8;
val |= pbEncoded[2 + i];
}
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
{
if (pDecodePara && pDecodePara->pfnAlloc)
*(BYTE **)pvStructInfo = pDecodePara->pfnAlloc(sizeof(int));
else
*(BYTE **)pvStructInfo = LocalAlloc(0, sizeof(int));
if (!*(BYTE **)pvStructInfo)
return FALSE;
memcpy(*(BYTE **)pvStructInfo, &val, sizeof(int));
ret = TRUE;
}
else if (*pcbStructInfo < sizeof(int))
{
*pcbStructInfo = sizeof(int);
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
*pcbStructInfo = sizeof(int);
memcpy(pvStructInfo, &val, sizeof(int));
ret = TRUE;
}
return ret;
}
typedef BOOL (WINAPI *CryptDecodeObjectExFunc)(DWORD, LPCSTR, const BYTE *,
DWORD, DWORD, PCRYPT_DECODE_PARA, void *, DWORD *);
@ -493,7 +564,7 @@ BOOL WINAPI CryptDecodeObjectEx(DWORD dwCertEncodingType, LPCSTR lpszStructType,
HMODULE lib = NULL;
CryptDecodeObjectExFunc decodeFunc = NULL;
FIXME("(0x%08lx, %s, %p, %ld, 0x%08lx, %p, %p, %p): stub\n",
TRACE("(0x%08lx, %s, %p, %ld, 0x%08lx, %p, %p, %p): semi-stub\n",
dwCertEncodingType, HIWORD(lpszStructType) ? debugstr_a(lpszStructType) :
"(integer value)", pbEncoded, cbEncoded, dwFlags, pDecodePara,
pvStructInfo, pcbStructInfo);
@ -512,6 +583,9 @@ BOOL WINAPI CryptDecodeObjectEx(DWORD dwCertEncodingType, LPCSTR lpszStructType,
{
switch (LOWORD(lpszStructType))
{
case (WORD)X509_INTEGER:
decodeFunc = CRYPT_AsnDecodeInt;
break;
default:
FIXME("%d: unimplemented\n", LOWORD(lpszStructType));
}

70
dlls/crypt32/tests/encode.c
View File

@ -32,9 +32,7 @@ struct encodedInt
BYTE encoded[6];
};
static void test_encodeint(void)
{
static const struct encodedInt ints[] = {
static const struct encodedInt ints[] = {
{ 1, { 2, 1, 1 } },
{ 127, { 2, 1, 0x7f } },
{ 128, { 2, 2, 0x00, 0x80 } },
@ -42,7 +40,10 @@ static void test_encodeint(void)
{ -128, { 2, 1, 0x80 } },
{ -129, { 2, 2, 0xff, 0x7f } },
{ 0xbaddf00d, { 2, 4, 0xba, 0xdd, 0xf0, 0x0d } },
};
};
static void test_encodeint(void)
{
DWORD bufSize = 0;
int i;
BOOL ret;
@ -83,6 +84,66 @@ static void test_encodeint(void)
}
}
static void test_decodeint(void)
{
static const char bigInt[] = { 2, 5, 0xff, 0xfe, 0xff, 0xfe, 0xff };
static const char testStr[] = { 16, 4, 't', 'e', 's', 't' };
BYTE *buf = NULL;
DWORD bufSize = 0;
int i;
BOOL ret;
/* CryptDecodeObjectEx with NULL bufSize crashes..
ret = CryptDecodeObjectEx(3, X509_INTEGER, &ints[0].encoded,
ints[0].encoded[1] + 2, 0, NULL, NULL, NULL);
*/
/* check bogus encoding */
ret = CryptDecodeObjectEx(3, X509_INTEGER, (BYTE *)&ints[0].encoded,
ints[0].encoded[1] + 2, 0, NULL, NULL, &bufSize);
ok(!ret && GetLastError() == ERROR_FILE_NOT_FOUND,
"Expected ERROR_FILE_NOT_FOUND, got %ld\n", GetLastError());
/* check with NULL integer buffer. Windows XP returns an apparently random
* error code (0x01c567df).
*/
ret = CryptDecodeObjectEx(X509_ASN_ENCODING, X509_INTEGER, NULL, 0, 0,
NULL, NULL, &bufSize);
ok(!ret, "Expected failure, got success\n");
/* check with a valid, but too large, integer */
ret = CryptDecodeObjectEx(X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
X509_INTEGER, bigInt, bigInt[1] + 2, CRYPT_ENCODE_ALLOC_FLAG, NULL,
(BYTE *)&buf, &bufSize);
ok(!ret && GetLastError() == CRYPT_E_ASN1_LARGE,
"Expected CRYPT_E_ASN1_LARGE, got %ld\n", GetLastError());
/* check with a DER-encoded string */
ret = CryptDecodeObjectEx(X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
X509_INTEGER, testStr, testStr[1] + 2, CRYPT_ENCODE_ALLOC_FLAG, NULL,
(BYTE *)&buf, &bufSize);
ok(!ret && GetLastError() == CRYPT_E_ASN1_BADTAG,
"Expected CRYPT_E_ASN1_BADTAG, got %ld\n", GetLastError());
for (i = 0; i < sizeof(ints) / sizeof(ints[0]); i++)
{
/* WinXP succeeds rather than failing with ERROR_MORE_DATA */
ret = CryptDecodeObjectEx(X509_ASN_ENCODING, X509_INTEGER,
(BYTE *)&ints[i].encoded, ints[i].encoded[1] + 2, 0, NULL, NULL,
&bufSize);
ok(ret || GetLastError() == ERROR_MORE_DATA,
"Expected success or ERROR_MORE_DATA, got %ld\n", GetLastError());
ret = CryptDecodeObjectEx(X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
X509_INTEGER, (BYTE *)&ints[i].encoded, ints[i].encoded[1] + 2,
CRYPT_ENCODE_ALLOC_FLAG, NULL, (BYTE *)&buf, &bufSize);
ok(ret, "CryptDecodeObjectEx failed: %ld\n", GetLastError());
ok(bufSize == sizeof(int), "Expected size %d, got %ld\n", sizeof(int),
bufSize);
ok(buf != NULL, "Expected allocated buffer\n");
if (buf)
{
ok(!memcmp(buf, &ints[i].val, bufSize), "Expected %d, got %d\n",
ints[i].val, *(int *)buf);
LocalFree(buf);
}
}
}
static void test_registerOIDFunction(void)
{
static const WCHAR bogusDll[] = { 'b','o','g','u','s','.','d','l','l',0 };
@ -140,5 +201,6 @@ static void test_registerOIDFunction(void)
START_TEST(encode)
{
test_encodeint();
test_decodeint();
test_registerOIDFunction();
}