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rsaenh: Infer private exponent length from data length.

This commit is contained in:
Juan Lang 2011-10-31 10:44:23 -07:00 committed by Alexandre Julliard
parent f0e2cba471
commit 2d658db553
4 changed files with 10 additions and 7 deletions
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8
dlls/rsaenh/implglue.c
View File

@ -482,7 +482,7 @@ BOOL export_private_key_impl(BYTE *pbDest, const KEY_CONTEXT *pKeyContext, DWORD
}
BOOL import_private_key_impl(CONST BYTE *pbSrc, KEY_CONTEXT *pKeyContext, DWORD dwKeyLen,
DWORD dwPubExp)
DWORD dwDataLen, DWORD dwPubExp)
{
BYTE *pbTemp, *pbBigNum;
@ -496,7 +496,7 @@ BOOL import_private_key_impl(CONST BYTE *pbSrc, KEY_CONTEXT *pKeyContext, DWORD
pbTemp = HeapAlloc(GetProcessHeap(), 0, 2*dwKeyLen+5*((dwKeyLen+1)>>1));
if (!pbTemp) return FALSE;
memcpy(pbTemp, pbSrc, 2*dwKeyLen+5*((dwKeyLen+1)>>1));
memcpy(pbTemp, pbSrc, min(dwDataLen, 2*dwKeyLen+5*((dwKeyLen+1)>>1)));
pbBigNum = pbTemp;
pKeyContext->rsa.type = PK_PRIVATE;
@ -518,6 +518,10 @@ BOOL import_private_key_impl(CONST BYTE *pbSrc, KEY_CONTEXT *pKeyContext, DWORD
reverse_bytes(pbBigNum, (dwKeyLen+1)>>1);
mp_read_unsigned_bin(&pKeyContext->rsa.qP, pbBigNum, (dwKeyLen+1)>>1);
pbBigNum += (dwKeyLen+1)>>1;
/* The size of the private exponent d is inferred from the remaining
* data length.
*/
dwKeyLen = min(dwKeyLen, dwDataLen - (pbBigNum - pbTemp));
reverse_bytes(pbBigNum, dwKeyLen);
mp_read_unsigned_bin(&pKeyContext->rsa.d, pbBigNum, dwKeyLen);
mp_set_int(&pKeyContext->rsa.e, dwPubExp);

2
dlls/rsaenh/implglue.h
View File

@ -98,7 +98,7 @@ BOOL import_public_key_impl(CONST BYTE *pbSrc, KEY_CONTEXT *pKeyContext, DWORD d
BOOL export_private_key_impl(BYTE *pbDest, const KEY_CONTEXT *pKeyContext, DWORD dwKeyLen,
DWORD *pdwPubExp) DECLSPEC_HIDDEN;
BOOL import_private_key_impl(CONST BYTE* pbSrc, KEY_CONTEXT *pKeyContext, DWORD dwKeyLen,
DWORD dwPubExp) DECLSPEC_HIDDEN;
DWORD dwDataLen, DWORD dwPubExp) DECLSPEC_HIDDEN;
BOOL gen_rand_impl(BYTE *pbBuffer, DWORD dwLen) DECLSPEC_HIDDEN;

6
dlls/rsaenh/rsaenh.c
View File

@ -2745,10 +2745,10 @@ static BOOL import_private_key(HCRYPTPROV hProv, CONST BYTE *pbData, DWORD dwDat
return FALSE;
}
if ((dwDataLen < sizeof(BLOBHEADER) + sizeof(RSAPUBKEY) +
(2 * pRSAPubKey->bitlen >> 3) + (5 * ((pRSAPubKey->bitlen+8)>>4))))
(pRSAPubKey->bitlen >> 3) + (5 * ((pRSAPubKey->bitlen+8)>>4))))
{
DWORD expectedLen = sizeof(BLOBHEADER) + sizeof(RSAPUBKEY) +
(2 * pRSAPubKey->bitlen >> 3) + (5 * ((pRSAPubKey->bitlen+8)>>4));
(pRSAPubKey->bitlen >> 3) + (5 * ((pRSAPubKey->bitlen+8)>>4));
ERR("blob too short for pub key: expect %d, got %d\n",
expectedLen, dwDataLen);
@ -2760,7 +2760,7 @@ static BOOL import_private_key(HCRYPTPROV hProv, CONST BYTE *pbData, DWORD dwDat
if (*phKey == (HCRYPTKEY)INVALID_HANDLE_VALUE) return FALSE;
setup_key(pCryptKey);
ret = import_private_key_impl((CONST BYTE*)(pRSAPubKey+1), &pCryptKey->context,
pRSAPubKey->bitlen/8, pRSAPubKey->pubexp);
pRSAPubKey->bitlen/8, dwDataLen, pRSAPubKey->pubexp);
if (ret) {
if (dwFlags & CRYPT_EXPORTABLE)
pCryptKey->dwPermissions |= CRYPT_EXPORT;

1
dlls/rsaenh/tests/rsaenh.c
View File

@ -1573,7 +1573,6 @@ static void test_import_private(void)
for (; dwLen < sizeof(abPlainPrivateKey); dwLen++)
{
result = CryptImportKey(hProv, abPlainPrivateKey, dwLen, 0, 0, &hKeyExchangeKey);
todo_wine
ok(result, "CryptImportKey failed at size %d: %d (%08x)\n", dwLen,
GetLastError(), GetLastError());
if (result)