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crypt32: Introduce a helper function to get encoded length that allows indefinite-length encoding.

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This commit is contained in:
Juan Lang 2007-09-17 15:09:16 -07:00 committed by Alexandre Julliard
parent 54a51afcd7
commit 7ecf5becbd
1 changed files with 20 additions and 5 deletions
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25
dlls/crypt32/decode.c
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@ -135,9 +135,11 @@ static BOOL WINAPI CRYPT_AsnDecodeUnsignedIntegerInternal(
/* 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.
* error code and returns FALSE. If the encoded length is unknown due to
* indefinite length encoding, *len is set to CMSG_INDEFINITE_LENGTH.
*/
static BOOL CRYPT_GetLen(const BYTE *pbEncoded, DWORD cbEncoded, DWORD *len)
static BOOL CRYPT_GetLengthIndefinite(const BYTE *pbEncoded, DWORD cbEncoded,
DWORD *len)
{
BOOL ret;
@ -161,9 +163,8 @@ static BOOL CRYPT_GetLen(const BYTE *pbEncoded, DWORD cbEncoded, DWORD *len)
}
else if (pbEncoded[1] == 0x80)
{
FIXME("unimplemented for indefinite-length encoding\n");
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
*len = CMSG_INDEFINITE_LENGTH;
ret = TRUE;
}
else
{
@ -204,6 +205,20 @@ static BOOL CRYPT_GetLen(const BYTE *pbEncoded, DWORD cbEncoded, DWORD *len)
return ret;
}
/* Like CRYPT_GetLengthIndefinite, but disallows indefinite-length encoding. */
static BOOL CRYPT_GetLen(const BYTE *pbEncoded, DWORD cbEncoded, DWORD *len)
{
BOOL ret;
if ((ret = CRYPT_GetLengthIndefinite(pbEncoded, cbEncoded, len)) &&
*len == CMSG_INDEFINITE_LENGTH)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
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