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wine/dlls/wintrust/asn.c

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/* wintrust asn functions
*
* Copyright 2007 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
*
*/
#include <stdarg.h>
#include <stdio.h>
#include <assert.h>
#define NONAMELESSUNION
#include "windef.h"
#include "winbase.h"
#include "winerror.h"
#include "wincrypt.h"
#include "wintrust.h"
#include "snmp.h"
#include "winternl.h"
#include "wine/debug.h"
#include "wine/exception.h"
WINE_DEFAULT_DEBUG_CHANNEL(cryptasn);
#ifdef WORDS_BIGENDIAN
#define hton16(x) (x)
#define n16toh(x) (x)
#else
#define hton16(x) RtlUshortByteSwap(x)
#define n16toh(x) RtlUshortByteSwap(x)
#endif
#define ASN_BITSTRING (ASN_UNIVERSAL | ASN_PRIMITIVE | 0x03)
static BOOL CRYPT_EncodeLen(DWORD len, BYTE *pbEncoded, DWORD *pcbEncoded)
{
DWORD bytesNeeded, significantBytes = 0;
if (len <= 0x7f)
bytesNeeded = 1;
else
{
DWORD temp;
for (temp = len, significantBytes = sizeof(temp); !(temp & 0xff000000);
temp <<= 8, significantBytes--)
;
bytesNeeded = significantBytes + 1;
}
if (!pbEncoded)
{
*pcbEncoded = bytesNeeded;
return TRUE;
}
if (*pcbEncoded < bytesNeeded)
{
SetLastError(ERROR_MORE_DATA);
return FALSE;
}
if (len <= 0x7f)
*pbEncoded = (BYTE)len;
else
{
DWORD i;
*pbEncoded++ = significantBytes | 0x80;
for (i = 0; i < significantBytes; i++)
{
*(pbEncoded + significantBytes - i - 1) = (BYTE)(len & 0xff);
len >>= 8;
}
}
*pcbEncoded = bytesNeeded;
return TRUE;
}
static BOOL WINAPI CRYPT_AsnEncodeOctets(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, BYTE *pbEncoded,
DWORD *pcbEncoded)
{
BOOL ret = TRUE;
const CRYPT_DATA_BLOB *blob = (const CRYPT_DATA_BLOB *)pvStructInfo;
DWORD bytesNeeded, lenBytes;
TRACE("(%d, %p), %p, %d\n", blob->cbData, blob->pbData, pbEncoded,
*pcbEncoded);
CRYPT_EncodeLen(blob->cbData, NULL, &lenBytes);
bytesNeeded = 1 + lenBytes + blob->cbData;
if (!pbEncoded)
*pcbEncoded = bytesNeeded;
else if (*pcbEncoded < bytesNeeded)
{
*pcbEncoded = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
*pbEncoded++ = ASN_OCTETSTRING;
CRYPT_EncodeLen(blob->cbData, pbEncoded, &lenBytes);
pbEncoded += lenBytes;
if (blob->cbData)
memcpy(pbEncoded, blob->pbData, blob->cbData);
}
TRACE("returning %d\n", ret);
return ret;
}
BOOL WINAPI WVTAsn1SpcLinkEncode(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, BYTE *pbEncoded,
DWORD *pcbEncoded)
{
BOOL ret = FALSE;
TRACE("(0x%08x, %s, %p, %p, %p)\n", dwCertEncodingType,
debugstr_a(lpszStructType), pvStructInfo, pbEncoded,
pcbEncoded);
__TRY
{
const SPC_LINK *link = (const SPC_LINK *)pvStructInfo;
DWORD bytesNeeded, lenBytes;
switch (link->dwLinkChoice)
{
case SPC_FILE_LINK_CHOICE:
{
DWORD fileNameLen, fileNameLenBytes;
LPWSTR ptr;
fileNameLen = link->u.pwszFile ?
lstrlenW(link->u.pwszFile) * sizeof(WCHAR) : 0;
CRYPT_EncodeLen(fileNameLen, NULL, &fileNameLenBytes);
CRYPT_EncodeLen(1 + fileNameLenBytes + fileNameLen, NULL,
&lenBytes);
bytesNeeded = 2 + lenBytes + fileNameLenBytes + fileNameLen;
if (!pbEncoded)
{
*pcbEncoded = bytesNeeded;
ret = TRUE;
}
else if (*pcbEncoded < bytesNeeded)
{
SetLastError(ERROR_MORE_DATA);
*pcbEncoded = bytesNeeded;
}
else
{
*pcbEncoded = bytesNeeded;
*pbEncoded++ = ASN_CONSTRUCTOR | ASN_CONTEXT | 2;
CRYPT_EncodeLen(1 + fileNameLenBytes + fileNameLen, pbEncoded,
&lenBytes);
pbEncoded += lenBytes;
*pbEncoded++ = ASN_CONTEXT;
CRYPT_EncodeLen(fileNameLen, pbEncoded, &fileNameLenBytes);
pbEncoded += fileNameLenBytes;
for (ptr = link->u.pwszFile; ptr && *ptr; ptr++)
{
*(WCHAR *)pbEncoded = hton16(*ptr);
pbEncoded += sizeof(WCHAR);
}
ret = TRUE;
}
break;
}
case SPC_MONIKER_LINK_CHOICE:
{
DWORD classIdLenBytes, dataLenBytes, dataLen;
CRYPT_DATA_BLOB classId = { sizeof(link->u.Moniker.ClassId),
(BYTE *)&link->u.Moniker.ClassId };
CRYPT_EncodeLen(classId.cbData, NULL, &classIdLenBytes);
CRYPT_EncodeLen(link->u.Moniker.SerializedData.cbData, NULL,
&dataLenBytes);
dataLen = 2 + classIdLenBytes + classId.cbData +
dataLenBytes + link->u.Moniker.SerializedData.cbData;
CRYPT_EncodeLen(dataLen, NULL, &lenBytes);
bytesNeeded = 1 + dataLen + lenBytes;
if (!pbEncoded)
{
*pcbEncoded = bytesNeeded;
ret = TRUE;
}
else if (*pcbEncoded < bytesNeeded)
{
SetLastError(ERROR_MORE_DATA);
*pcbEncoded = bytesNeeded;
}
else
{
DWORD size;
*pcbEncoded = bytesNeeded;
*pbEncoded++ = ASN_CONSTRUCTOR | ASN_CONTEXT | 1;
CRYPT_EncodeLen(dataLen, pbEncoded, &lenBytes);
pbEncoded += lenBytes;
size = 1 + classIdLenBytes + classId.cbData;
CRYPT_AsnEncodeOctets(X509_ASN_ENCODING, NULL, &classId,
pbEncoded, &size);
pbEncoded += size;
size = 1 + dataLenBytes + link->u.Moniker.SerializedData.cbData;
CRYPT_AsnEncodeOctets(X509_ASN_ENCODING, NULL,
&link->u.Moniker.SerializedData, pbEncoded, &size);
pbEncoded += size;
ret = TRUE;
}
break;
}
case SPC_URL_LINK_CHOICE:
{
LPWSTR ptr;
DWORD urlLen;
/* Check for invalid characters in URL */
ret = TRUE;
urlLen = 0;
for (ptr = link->u.pwszUrl; ptr && *ptr && ret; ptr++)
if (*ptr > 0x7f)
{
*pcbEncoded = 0;
SetLastError(CRYPT_E_INVALID_IA5_STRING);
ret = FALSE;
}
else
urlLen++;
if (ret)
{
CRYPT_EncodeLen(urlLen, NULL, &lenBytes);
bytesNeeded = 1 + lenBytes + urlLen;
if (!pbEncoded)
*pcbEncoded = bytesNeeded;
else if (*pcbEncoded < bytesNeeded)
{
SetLastError(ERROR_MORE_DATA);
*pcbEncoded = bytesNeeded;
ret = FALSE;
}
else
{
*pcbEncoded = bytesNeeded;
*pbEncoded++ = ASN_CONTEXT;
CRYPT_EncodeLen(urlLen, pbEncoded, &lenBytes);
pbEncoded += lenBytes;
for (ptr = link->u.pwszUrl; ptr && *ptr; ptr++)
*pbEncoded++ = (BYTE)*ptr;
}
}
break;
}
default:
SetLastError(E_INVALIDARG);
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
}
__ENDTRY
TRACE("returning %d\n", ret);
return ret;
}
typedef BOOL (WINAPI *CryptEncodeObjectFunc)(DWORD, LPCSTR, const void *,
BYTE *, DWORD *);
struct AsnEncodeSequenceItem
{
const void *pvStructInfo;
CryptEncodeObjectFunc encodeFunc;
DWORD size; /* used during encoding, not for your use */
};
static BOOL WINAPI CRYPT_AsnEncodeSequence(DWORD dwCertEncodingType,
struct AsnEncodeSequenceItem items[], DWORD cItem, BYTE *pbEncoded,
DWORD *pcbEncoded)
{
BOOL ret;
DWORD i, dataLen = 0;
TRACE("%p, %d, %p, %d\n", items, cItem, pbEncoded, *pcbEncoded);
for (i = 0, ret = TRUE; ret && i < cItem; i++)
{
ret = items[i].encodeFunc(dwCertEncodingType, NULL,
items[i].pvStructInfo, NULL, &items[i].size);
/* Some functions propagate their errors through the size */
if (!ret)
*pcbEncoded = items[i].size;
dataLen += items[i].size;
}
if (ret)
{
DWORD lenBytes, bytesNeeded;
CRYPT_EncodeLen(dataLen, NULL, &lenBytes);
bytesNeeded = 1 + lenBytes + dataLen;
if (!pbEncoded)
*pcbEncoded = bytesNeeded;
else if (*pcbEncoded < bytesNeeded)
{
*pcbEncoded = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
*pcbEncoded = bytesNeeded;
*pbEncoded++ = ASN_SEQUENCE;
CRYPT_EncodeLen(dataLen, pbEncoded, &lenBytes);
pbEncoded += lenBytes;
for (i = 0; ret && i < cItem; i++)
{
ret = items[i].encodeFunc(dwCertEncodingType, NULL,
items[i].pvStructInfo, pbEncoded, &items[i].size);
/* Some functions propagate their errors through the size */
if (!ret)
*pcbEncoded = items[i].size;
pbEncoded += items[i].size;
}
}
}
TRACE("returning %d\n", ret);
return ret;
}
static BOOL WINAPI CRYPT_AsnEncodeBits(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, BYTE *pbEncoded,
DWORD *pcbEncoded)
{
BOOL ret = FALSE;
__TRY
{
const CRYPT_BIT_BLOB *blob = (const CRYPT_BIT_BLOB *)pvStructInfo;
DWORD bytesNeeded, lenBytes, dataBytes;
BYTE unusedBits;
/* yep, MS allows cUnusedBits to be >= 8 */
if (!blob->cUnusedBits)
{
dataBytes = blob->cbData;
unusedBits = 0;
}
else if (blob->cbData * 8 > blob->cUnusedBits)
{
dataBytes = (blob->cbData * 8 - blob->cUnusedBits) / 8 + 1;
unusedBits = blob->cUnusedBits >= 8 ? blob->cUnusedBits / 8 :
blob->cUnusedBits;
}
else
{
dataBytes = 0;
unusedBits = 0;
}
CRYPT_EncodeLen(dataBytes + 1, NULL, &lenBytes);
bytesNeeded = 1 + lenBytes + dataBytes + 1;
if (!pbEncoded)
{
*pcbEncoded = bytesNeeded;
ret = TRUE;
}
else if (*pcbEncoded < bytesNeeded)
{
*pcbEncoded = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
}
else
{
ret = TRUE;
*pcbEncoded = bytesNeeded;
*pbEncoded++ = ASN_BITSTRING;
CRYPT_EncodeLen(dataBytes + 1, pbEncoded, &lenBytes);
pbEncoded += lenBytes;
*pbEncoded++ = unusedBits;
if (dataBytes)
{
BYTE mask = 0xff << unusedBits;
if (dataBytes > 1)
{
memcpy(pbEncoded, blob->pbData, dataBytes - 1);
pbEncoded += dataBytes - 1;
}
*pbEncoded = *(blob->pbData + dataBytes - 1) & mask;
}
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
}
__ENDTRY
return ret;
}
struct AsnConstructedItem
{
BYTE tag;
const void *pvStructInfo;
CryptEncodeObjectFunc encodeFunc;
};
static BOOL WINAPI CRYPT_AsnEncodeConstructed(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, BYTE *pbEncoded,
DWORD *pcbEncoded)
{
BOOL ret;
const struct AsnConstructedItem *item =
(const struct AsnConstructedItem *)pvStructInfo;
DWORD len;
if ((ret = item->encodeFunc(dwCertEncodingType, lpszStructType,
item->pvStructInfo, NULL, &len)))
{
DWORD dataLen, bytesNeeded;
CRYPT_EncodeLen(len, NULL, &dataLen);
bytesNeeded = 1 + dataLen + len;
if (!pbEncoded)
*pcbEncoded = bytesNeeded;
else if (*pcbEncoded < bytesNeeded)
{
*pcbEncoded = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
*pcbEncoded = bytesNeeded;
*pbEncoded++ = ASN_CONTEXT | ASN_CONSTRUCTOR | item->tag;
CRYPT_EncodeLen(len, pbEncoded, &dataLen);
pbEncoded += dataLen;
ret = item->encodeFunc(dwCertEncodingType, lpszStructType,
item->pvStructInfo, pbEncoded, &len);
if (!ret)
{
/* Some functions propagate their errors through the size */
*pcbEncoded = len;
}
}
}
else
{
/* Some functions propagate their errors through the size */
*pcbEncoded = len;
}
return ret;
}
BOOL WINAPI WVTAsn1SpcPeImageDataEncode(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, BYTE *pbEncoded,
DWORD *pcbEncoded)
{
const SPC_PE_IMAGE_DATA *imageData =
(const SPC_PE_IMAGE_DATA *)pvStructInfo;
BOOL ret = FALSE;
TRACE("(0x%08x, %s, %p, %p, %p)\n", dwCertEncodingType,
debugstr_a(lpszStructType), pvStructInfo, pbEncoded,
pcbEncoded);
__TRY
{
struct AsnEncodeSequenceItem items[2] = {
{ 0 }
};
struct AsnConstructedItem constructed = { 0, imageData->pFile,
WVTAsn1SpcLinkEncode };
DWORD cItem = 0;
if (imageData->Flags.cbData)
{
items[cItem].pvStructInfo = &imageData->Flags;
items[cItem].encodeFunc = CRYPT_AsnEncodeBits;
cItem++;
}
if (imageData->pFile)
{
items[cItem].pvStructInfo = &constructed;
items[cItem].encodeFunc = CRYPT_AsnEncodeConstructed;
cItem++;
}
ret = CRYPT_AsnEncodeSequence(dwCertEncodingType, items, cItem,
pbEncoded, pcbEncoded);
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
}
__ENDTRY
TRACE("returning %d\n", ret);
return ret;
}
static BOOL WINAPI CRYPT_AsnEncodeOid(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, BYTE *pbEncoded,
DWORD *pcbEncoded)
{
LPCSTR pszObjId = (LPCSTR)pvStructInfo;
DWORD bytesNeeded = 0, lenBytes;
BOOL ret = TRUE;
int firstPos = 0;
BYTE firstByte = 0;
TRACE("%s\n", debugstr_a(pszObjId));
if (pszObjId)
{
const char *ptr;
int val1, val2;
if (sscanf(pszObjId, "%d.%d.%n", &val1, &val2, &firstPos) != 2)
{
SetLastError(CRYPT_E_ASN1_ERROR);
return FALSE;
}
bytesNeeded++;
firstByte = val1 * 40 + val2;
ptr = pszObjId + firstPos;
while (ret && *ptr)
{
int pos;
/* note I assume each component is at most 32-bits long in base 2 */
if (sscanf(ptr, "%d%n", &val1, &pos) == 1)
{
if (val1 >= 0x10000000)
bytesNeeded += 5;
else if (val1 >= 0x200000)
bytesNeeded += 4;
else if (val1 >= 0x4000)
bytesNeeded += 3;
else if (val1 >= 0x80)
bytesNeeded += 2;
else
bytesNeeded += 1;
ptr += pos;
if (*ptr == '.')
ptr++;
}
else
{
SetLastError(CRYPT_E_ASN1_ERROR);
return FALSE;
}
}
CRYPT_EncodeLen(bytesNeeded, NULL, &lenBytes);
}
else
lenBytes = 1;
bytesNeeded += 1 + lenBytes;
if (pbEncoded)
{
if (*pcbEncoded < bytesNeeded)
{
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
*pbEncoded++ = ASN_OBJECTIDENTIFIER;
CRYPT_EncodeLen(bytesNeeded - 1 - lenBytes, pbEncoded, &lenBytes);
pbEncoded += lenBytes;
if (pszObjId)
{
const char *ptr;
int val, pos;
*pbEncoded++ = firstByte;
ptr = pszObjId + firstPos;
while (ret && *ptr)
{
sscanf(ptr, "%d%n", &val, &pos);
{
unsigned char outBytes[5];
int numBytes, i;
if (val >= 0x10000000)
numBytes = 5;
else if (val >= 0x200000)
numBytes = 4;
else if (val >= 0x4000)
numBytes = 3;
else if (val >= 0x80)
numBytes = 2;
else
numBytes = 1;
for (i = numBytes; i > 0; i--)
{
outBytes[i - 1] = val & 0x7f;
val >>= 7;
}
for (i = 0; i < numBytes - 1; i++)
*pbEncoded++ = outBytes[i] | 0x80;
*pbEncoded++ = outBytes[i];
ptr += pos;
if (*ptr == '.')
ptr++;
}
}
}
}
}
*pcbEncoded = bytesNeeded;
return ret;
}
static BOOL WINAPI CRYPT_CopyEncodedBlob(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, BYTE *pbEncoded,
DWORD *pcbEncoded)
{
const CRYPT_DER_BLOB *blob = (const CRYPT_DER_BLOB *)pvStructInfo;
BOOL ret = TRUE;
if (!pbEncoded)
*pcbEncoded = blob->cbData;
else if (*pcbEncoded < blob->cbData)
{
*pcbEncoded = blob->cbData;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
if (blob->cbData)
memcpy(pbEncoded, blob->pbData, blob->cbData);
*pcbEncoded = blob->cbData;
}
return ret;
}
static BOOL WINAPI CRYPT_AsnEncodeAlgorithmIdWithNullParams(
DWORD dwCertEncodingType, LPCSTR lpszStructType, const void *pvStructInfo,
BYTE *pbEncoded, DWORD *pcbEncoded)
{
const CRYPT_ALGORITHM_IDENTIFIER *algo =
(const CRYPT_ALGORITHM_IDENTIFIER *)pvStructInfo;
static const BYTE asn1Null[] = { ASN_NULL, 0 };
static const CRYPT_DATA_BLOB nullBlob = { sizeof(asn1Null),
(LPBYTE)asn1Null };
BOOL ret;
struct AsnEncodeSequenceItem items[2] = {
{ algo->pszObjId, CRYPT_AsnEncodeOid, 0 },
{ NULL, CRYPT_CopyEncodedBlob, 0 },
};
if (algo->Parameters.cbData)
items[1].pvStructInfo = &algo->Parameters;
else
items[1].pvStructInfo = &nullBlob;
ret = CRYPT_AsnEncodeSequence(dwCertEncodingType, items,
sizeof(items) / sizeof(items[0]), pbEncoded, pcbEncoded);
return ret;
}
static BOOL WINAPI CRYPT_AsnEncodeAttributeTypeValue(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, BYTE *pbEncoded,
DWORD *pcbEncoded)
{
const CRYPT_ATTRIBUTE_TYPE_VALUE *typeValue =
(const CRYPT_ATTRIBUTE_TYPE_VALUE *)pvStructInfo;
struct AsnEncodeSequenceItem items[] = {
{ &typeValue->pszObjId, CRYPT_AsnEncodeOid, 0 },
{ &typeValue->Value, CRYPT_CopyEncodedBlob, 0 },
};
return CRYPT_AsnEncodeSequence(X509_ASN_ENCODING,
items, sizeof(items) / sizeof(items[0]), pbEncoded, pcbEncoded);
}
struct SPCDigest
{
CRYPT_ALGORITHM_IDENTIFIER DigestAlgorithm;
CRYPT_HASH_BLOB Digest;
};
static BOOL WINAPI CRYPT_AsnEncodeSPCDigest(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, BYTE *pbEncoded,
DWORD *pcbEncoded)
{
const struct SPCDigest *digest = (const struct SPCDigest *)pvStructInfo;
struct AsnEncodeSequenceItem items[] = {
{ &digest->DigestAlgorithm, CRYPT_AsnEncodeAlgorithmIdWithNullParams, 0 },
{ &digest->Digest, CRYPT_CopyEncodedBlob, 0 },
};
return CRYPT_AsnEncodeSequence(X509_ASN_ENCODING,
items, sizeof(items) / sizeof(items[0]), pbEncoded, pcbEncoded);
}
BOOL WINAPI WVTAsn1SpcIndirectDataContentEncode(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, BYTE *pbEncoded,
DWORD *pcbEncoded)
{
BOOL ret = FALSE;
TRACE("(0x%08x, %s, %p, %p, %p)\n", dwCertEncodingType,
debugstr_a(lpszStructType), pvStructInfo, pbEncoded, pcbEncoded);
__TRY
{
const SPC_INDIRECT_DATA_CONTENT *data =
(const SPC_INDIRECT_DATA_CONTENT *)pvStructInfo;
struct AsnEncodeSequenceItem items[] = {
{ &data->Data, CRYPT_AsnEncodeAttributeTypeValue, 0 },
{ &data->DigestAlgorithm, CRYPT_AsnEncodeSPCDigest, 0 },
};
ret = CRYPT_AsnEncodeSequence(X509_ASN_ENCODING,
items, sizeof(items) / sizeof(items[0]), pbEncoded, pcbEncoded);
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
}
__ENDTRY
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 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 if (pbEncoded[1] == 0x80)
{
FIXME("unimplemented for indefinite-length encoding\n");
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
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;
}
static BOOL WINAPI CRYPT_AsnDecodeOctets(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
DWORD bytesNeeded, dataLen;
TRACE("%p, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
pvStructInfo, *pcbStructInfo);
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_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_AsnDecodeSPCLinkInternal(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = FALSE;
DWORD bytesNeeded = sizeof(SPC_LINK), dataLen;
TRACE("%p, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
pvStructInfo, *pcbStructInfo);
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
DWORD realDataLen;
switch (pbEncoded[0])
{
case ASN_CONTEXT:
bytesNeeded += (dataLen + 1) * sizeof(WCHAR);
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
PSPC_LINK link = (PSPC_LINK)pvStructInfo;
DWORD i;
link->dwLinkChoice = SPC_URL_LINK_CHOICE;
for (i = 0; i < dataLen; i++)
link->u.pwszUrl[i] =
*(pbEncoded + 1 + lenBytes + i);
link->u.pwszUrl[i] = '\0';
TRACE("returning url %s\n", debugstr_w(link->u.pwszUrl));
}
break;
case ASN_CONSTRUCTOR | ASN_CONTEXT | 1:
{
CRYPT_DATA_BLOB classId;
DWORD size = sizeof(classId);
if ((ret = CRYPT_AsnDecodeOctets(dwCertEncodingType, NULL,
pbEncoded + 1 + lenBytes, cbEncoded - 1 - lenBytes,
CRYPT_DECODE_NOCOPY_FLAG, &classId, &size)))
{
if (classId.cbData != sizeof(SPC_UUID))
{
SetLastError(CRYPT_E_BAD_ENCODE);
ret = FALSE;
}
else
{
CRYPT_DATA_BLOB data;
/* The tag length for the classId must be 1 since the
* length is correct.
*/
size = sizeof(data);
if ((ret = CRYPT_AsnDecodeOctets(dwCertEncodingType, NULL,
pbEncoded + 3 + lenBytes + classId.cbData,
cbEncoded - 3 - lenBytes - classId.cbData,
CRYPT_DECODE_NOCOPY_FLAG, &data, &size)))
{
bytesNeeded += data.cbData;
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
PSPC_LINK link = (PSPC_LINK)pvStructInfo;
link->dwLinkChoice = SPC_MONIKER_LINK_CHOICE;
/* pwszFile pointer was set by caller, copy it
* before overwriting it
*/
link->u.Moniker.SerializedData.pbData =
(BYTE *)link->u.pwszFile;
memcpy(&link->u.Moniker.ClassId, classId.pbData,
classId.cbData);
memcpy(link->u.Moniker.SerializedData.pbData,
data.pbData, data.cbData);
link->u.Moniker.SerializedData.cbData = data.cbData;
}
}
}
}
break;
}
case ASN_CONSTRUCTOR | ASN_CONTEXT | 2:
if (dataLen && pbEncoded[1 + lenBytes] != ASN_CONTEXT)
SetLastError(CRYPT_E_ASN1_BADTAG);
else if ((ret = CRYPT_GetLen(pbEncoded + 1 + lenBytes, dataLen,
&realDataLen)))
{
BYTE realLenBytes = GET_LEN_BYTES(pbEncoded[2 + lenBytes]);
bytesNeeded += realDataLen + sizeof(WCHAR);
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
PSPC_LINK link = (PSPC_LINK)pvStructInfo;
DWORD i;
const BYTE *ptr = pbEncoded + 2 + lenBytes + realLenBytes;
link->dwLinkChoice = SPC_FILE_LINK_CHOICE;
for (i = 0; i < dataLen / sizeof(WCHAR); i++)
link->u.pwszFile[i] =
hton16(*(WORD *)(ptr + i * sizeof(WCHAR)));
link->u.pwszFile[realDataLen / sizeof(WCHAR)] = '\0';
TRACE("returning file %s\n", debugstr_w(link->u.pwszFile));
}
}
else
{
bytesNeeded += sizeof(WCHAR);
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
PSPC_LINK link = (PSPC_LINK)pvStructInfo;
link->dwLinkChoice = SPC_FILE_LINK_CHOICE;
link->u.pwszFile[0] = '\0';
ret = TRUE;
}
}
break;
default:
SetLastError(CRYPT_E_ASN1_BADTAG);
}
}
TRACE("returning %d\n", ret);
return ret;
}
BOOL WINAPI WVTAsn1SpcLinkDecode(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = FALSE;
TRACE("%p, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
pvStructInfo, *pcbStructInfo);
__TRY
{
DWORD bytesNeeded;
ret = CRYPT_AsnDecodeSPCLinkInternal(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded, dwFlags, NULL, &bytesNeeded);
if (ret)
{
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
*pcbStructInfo = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
SPC_LINK *link = (SPC_LINK *)pvStructInfo;
link->u.pwszFile =
(LPWSTR)((BYTE *)pvStructInfo + sizeof(SPC_LINK));
ret = CRYPT_AsnDecodeSPCLinkInternal(dwCertEncodingType,
lpszStructType, pbEncoded, cbEncoded, dwFlags, pvStructInfo,
pcbStructInfo);
}
}
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
}
__ENDTRY
TRACE("returning %d\n", ret);
return ret;
}
typedef BOOL (WINAPI *CryptDecodeObjectFunc)(DWORD, LPCSTR, const BYTE *,
DWORD, DWORD, void *, DWORD *);
/* 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:
* If the item has dynamic data, set hasPointer to TRUE, pointerOffset to
* the offset within the 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;
CryptDecodeObjectFunc decodeFunc;
DWORD minSize;
BOOL optional;
BOOL hasPointer;
DWORD pointerOffset;
DWORD size;
};
/* Decodes the items in a sequence, where the items are described in items,
* the encoded data are in pbEncoded with length cbEncoded. Decodes into
* pvStructInfo. nextData is a pointer to the memory location at which the
* first decoded item with a dynamic pointer should point.
* Upon decoding, *cbDecoded is the total number of bytes decoded.
*/
static BOOL CRYPT_AsnDecodeSequenceItems(DWORD dwCertEncodingType,
struct AsnDecodeSequenceItem items[], DWORD cItem, const BYTE *pbEncoded,
DWORD cbEncoded, DWORD dwFlags, void *pvStructInfo, BYTE *nextData,
DWORD *cbDecoded)
{
BOOL ret;
DWORD i, decoded = 0;
const BYTE *ptr = pbEncoded;
TRACE("%p, %d, %p, %d, %08x, %p, %p, %p\n", items, cItem, pbEncoded,
cbEncoded, dwFlags, pvStructInfo, nextData, cbDecoded);
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 %d\n", i);
else
TRACE("sizing item %d\n", i);
ret = items[i].decodeFunc(dwCertEncodingType,
NULL, ptr, 1 + nextItemLenBytes + nextItemLen,
dwFlags & ~CRYPT_DECODE_ALLOC_FLAG,
pvStructInfo ? (BYTE *)pvStructInfo + items[i].offset
: NULL, &items[i].size);
if (ret)
{
/* Account for alignment padding */
if (items[i].size % sizeof(DWORD))
items[i].size += sizeof(DWORD) -
items[i].size % sizeof(DWORD);
TRACE("item %d size: %d\n", i, items[i].size);
if (nextData && items[i].hasPointer &&
items[i].size > items[i].minSize)
nextData += items[i].size - items[i].minSize;
ptr += 1 + nextItemLenBytes + nextItemLen;
decoded += 1 + nextItemLenBytes + nextItemLen;
TRACE("item %d: decoded %d bytes\n", i,
1 + nextItemLenBytes + nextItemLen);
}
else if (items[i].optional &&
GetLastError() == CRYPT_E_ASN1_BADTAG)
{
TRACE("skipping optional item %d\n", i);
items[i].size = items[i].minSize;
SetLastError(NOERROR);
ret = TRUE;
}
else
TRACE("item %d failed: %08x\n", i,
GetLastError());
}
else
{
TRACE("item %d: decoded %d bytes\n", i,
1 + nextItemLenBytes + nextItemLen);
ptr += 1 + nextItemLenBytes + nextItemLen;
decoded += 1 + nextItemLenBytes + nextItemLen;
items[i].size = items[i].minSize;
}
}
else if (items[i].optional)
{
TRACE("skipping optional item %d\n", i);
items[i].size = items[i].minSize;
}
else
{
TRACE("item %d: tag %02x doesn't match expected %02x\n",
i, ptr[0], items[i].tag);
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
}
}
else if (items[i].optional)
{
TRACE("missing optional item %d, skipping\n", i);
items[i].size = items[i].minSize;
}
else
{
TRACE("not enough bytes for item %d, failing\n", i);
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
}
if (ret)
*cbDecoded = decoded;
TRACE("returning %d\n", ret);
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.
*/
static BOOL CRYPT_AsnDecodeSequence(DWORD dwCertEncodingType,
struct AsnDecodeSequenceItem items[], DWORD cItem, const BYTE *pbEncoded,
DWORD cbEncoded, DWORD dwFlags, void *pvStructInfo, DWORD *pcbStructInfo,
void *startingPointer)
{
BOOL ret;
TRACE("%p, %d, %p, %d, %08x, %p, %d, %p\n", items, cItem, pbEncoded,
cbEncoded, dwFlags, pvStructInfo, *pcbStructInfo, startingPointer);
if (pbEncoded[0] == ASN_SEQUENCE)
{
DWORD dataLen;
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
DWORD lenBytes = GET_LEN_BYTES(pbEncoded[1]), cbDecoded;
const BYTE *ptr = pbEncoded + 1 + lenBytes;
cbEncoded -= 1 + lenBytes;
if (cbEncoded < dataLen)
{
TRACE("dataLen %d exceeds cbEncoded %d, failing\n", dataLen,
cbEncoded);
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
else
ret = CRYPT_AsnDecodeSequenceItems(dwFlags, items, cItem, ptr,
cbEncoded, dwFlags, NULL, NULL, &cbDecoded);
if (ret && cbDecoded != dataLen)
{
TRACE("expected %d decoded, got %d, failing\n", dataLen,
cbDecoded);
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
}
if (ret)
{
DWORD i, bytesNeeded = 0, structSize = 0;
for (i = 0; i < cItem; i++)
{
bytesNeeded += items[i].size;
structSize += items[i].minSize;
}
if (!pvStructInfo)
*pcbStructInfo = bytesNeeded;
else if (*pcbStructInfo < bytesNeeded)
{
SetLastError(ERROR_MORE_DATA);
*pcbStructInfo = bytesNeeded;
ret = FALSE;
}
else
{
BYTE *nextData;
*pcbStructInfo = bytesNeeded;
if (startingPointer)
nextData = (BYTE *)startingPointer;
else
nextData = (BYTE *)pvStructInfo + structSize;
memset(pvStructInfo, 0, structSize);
ret = CRYPT_AsnDecodeSequenceItems(dwFlags, items, cItem,
ptr, cbEncoded, dwFlags, pvStructInfo, nextData,
&cbDecoded);
}
}
}
}
else
{
SetLastError(CRYPT_E_ASN1_BADTAG);
ret = FALSE;
}
TRACE("returning %d (%08x)\n", ret, GetLastError());
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeBitsInternal(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret;
TRACE("(%p, %d, 0x%08x, %p, %d)\n", pbEncoded, cbEncoded, dwFlags,
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 (%08x)\n", ret, GetLastError());
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeSPCLinkPointer(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = FALSE;
DWORD dataLen;
if ((ret = CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen)))
{
BYTE lenBytes = GET_LEN_BYTES(pbEncoded[1]);
DWORD size;
SPC_LINK **pLink = (SPC_LINK **)pvStructInfo;
ret = CRYPT_AsnDecodeSPCLinkInternal(dwCertEncodingType, lpszStructType,
pbEncoded + 1 + lenBytes, dataLen, dwFlags, NULL, &size);
if (ret)
{
if (!pvStructInfo)
*pcbStructInfo = size + sizeof(PSPC_LINK);
else if (*pcbStructInfo < size + sizeof(PSPC_LINK))
{
*pcbStructInfo = size + sizeof(PSPC_LINK);
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
*pcbStructInfo = size + sizeof(PSPC_LINK);
/* Set imageData's pointer if necessary */
if (size > sizeof(SPC_LINK))
{
(*pLink)->u.pwszUrl =
(LPWSTR)((BYTE *)*pLink + sizeof(SPC_LINK));
}
ret = CRYPT_AsnDecodeSPCLinkInternal(dwCertEncodingType,
lpszStructType, pbEncoded + 1 + lenBytes, dataLen, dwFlags,
*pLink, pcbStructInfo);
}
}
}
return ret;
}
BOOL WINAPI WVTAsn1SpcPeImageDataDecode(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = FALSE;
TRACE("%p, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
pvStructInfo, *pcbStructInfo);
__TRY
{
struct AsnDecodeSequenceItem items[] = {
{ ASN_BITSTRING, offsetof(SPC_PE_IMAGE_DATA, Flags),
CRYPT_AsnDecodeBitsInternal, sizeof(CRYPT_BIT_BLOB), TRUE, TRUE,
offsetof(SPC_PE_IMAGE_DATA, Flags.pbData), 0 },
{ ASN_CONSTRUCTOR | ASN_CONTEXT, offsetof(SPC_PE_IMAGE_DATA, pFile),
CRYPT_AsnDecodeSPCLinkPointer, sizeof(PSPC_LINK), TRUE, TRUE,
offsetof(SPC_PE_IMAGE_DATA, pFile), 0 },
};
ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
pvStructInfo, pcbStructInfo, NULL);
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
}
__ENDTRY
TRACE("returning %d\n", ret);
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeOidIgnoreTag(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
DWORD dataLen;
TRACE("%p, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
pvStructInfo, *pcbStructInfo);
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;
}
static BOOL WINAPI CRYPT_AsnDecodeOid(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = FALSE;
TRACE("%p, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
pvStructInfo, *pcbStructInfo);
if (!cbEncoded)
SetLastError(CRYPT_E_ASN1_CORRUPT);
else if (pbEncoded[0] == ASN_OBJECTIDENTIFIER)
ret = CRYPT_AsnDecodeOidIgnoreTag(dwCertEncodingType, lpszStructType,
pbEncoded, cbEncoded, dwFlags, pvStructInfo, pcbStructInfo);
else
SetLastError(CRYPT_E_ASN1_BADTAG);
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeCopyBytes(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = TRUE;
DWORD bytesNeeded = sizeof(CRYPT_OBJID_BLOB);
TRACE("%p, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
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_AsnDecodeAttributeTypeValue(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
void *pvStructInfo, DWORD *pcbStructInfo)
{
CRYPT_ATTRIBUTE_TYPE_VALUE *typeValue =
(CRYPT_ATTRIBUTE_TYPE_VALUE *)pvStructInfo;
struct AsnDecodeSequenceItem items[] = {
{ ASN_OBJECTIDENTIFIER, offsetof(CRYPT_ATTRIBUTE_TYPE_VALUE, pszObjId),
CRYPT_AsnDecodeOid, sizeof(LPSTR), FALSE, TRUE,
offsetof(CRYPT_ATTRIBUTE_TYPE_VALUE, pszObjId), 0 },
{ 0, offsetof(CRYPT_ATTRIBUTE_TYPE_VALUE, Value),
CRYPT_AsnDecodeCopyBytes, sizeof(CRYPT_DATA_BLOB), TRUE, TRUE,
offsetof(CRYPT_ATTRIBUTE_TYPE_VALUE, Value.pbData), 0 },
};
TRACE("%p, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
pvStructInfo, *pcbStructInfo);
return CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
pvStructInfo, pcbStructInfo,
typeValue ? typeValue->pszObjId : NULL);
}
static BOOL WINAPI CRYPT_AsnDecodeAlgorithmId(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
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_AsnDecodeOidIgnoreTag, 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, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
pvStructInfo, *pcbStructInfo);
ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
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_AsnDecodeSPCDigest(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
void *pvStructInfo, DWORD *pcbStructInfo)
{
struct SPCDigest *digest =
(struct SPCDigest *)pvStructInfo;
struct AsnDecodeSequenceItem items[] = {
{ ASN_SEQUENCEOF, offsetof(struct SPCDigest, DigestAlgorithm),
CRYPT_AsnDecodeAlgorithmId, sizeof(CRYPT_ALGORITHM_IDENTIFIER),
FALSE, TRUE,
offsetof(struct SPCDigest, DigestAlgorithm.pszObjId), 0 },
{ ASN_OCTETSTRING, offsetof(struct SPCDigest, Digest),
CRYPT_AsnDecodeOctets, sizeof(CRYPT_DER_BLOB),
FALSE, TRUE, offsetof(struct SPCDigest, Digest.pbData), 0 },
};
TRACE("%p, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
pvStructInfo, *pcbStructInfo);
return CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
pvStructInfo, pcbStructInfo,
digest ? digest->DigestAlgorithm.pszObjId : NULL);
}
BOOL WINAPI WVTAsn1SpcIndirectDataContentDecode(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = FALSE;
TRACE("%p, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
pvStructInfo, *pcbStructInfo);
__TRY
{
struct AsnDecodeSequenceItem items[] = {
{ ASN_SEQUENCEOF, offsetof(SPC_INDIRECT_DATA_CONTENT, Data),
CRYPT_AsnDecodeAttributeTypeValue,
sizeof(CRYPT_ATTRIBUTE_TYPE_VALUE), FALSE, TRUE,
offsetof(SPC_INDIRECT_DATA_CONTENT, Data.pszObjId), 0 },
{ ASN_SEQUENCEOF, offsetof(SPC_INDIRECT_DATA_CONTENT, DigestAlgorithm),
CRYPT_AsnDecodeSPCDigest, sizeof(struct SPCDigest),
FALSE, TRUE,
offsetof(SPC_INDIRECT_DATA_CONTENT, DigestAlgorithm.pszObjId), 0 },
};
ret = CRYPT_AsnDecodeSequence(dwCertEncodingType, items,
sizeof(items) / sizeof(items[0]), pbEncoded, cbEncoded, dwFlags,
pvStructInfo, pcbStructInfo, NULL);
}
__EXCEPT_PAGE_FAULT
{
SetLastError(STATUS_ACCESS_VIOLATION);
}
__ENDTRY
TRACE("returning %d\n", ret);
return ret;
}
BOOL WINAPI WVTAsn1SpcSpOpusInfoDecode(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
void *pvStructInfo, DWORD *pcbStructInfo)
{
FIXME("%p, %d, %08x, %p, %d\n", pbEncoded, cbEncoded, dwFlags,
pvStructInfo, *pcbStructInfo);
return FALSE;
}
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