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a1f4fac03c
wine/dlls/crypt32/encode.c
Francois Gouget a1f4fac03c Fix the CryptEncodeObjectEx() prototype. 
Fixes winapi_check warnings.
2005-06-17 21:26:53 +00:00

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/*
* Copyright 2002 Mike McCormack for CodeWeavers
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* This file implements ASN.1 DER encoding and 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 <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include "windef.h"
#include "winbase.h"
#include "wincrypt.h"
#include "winreg.h"
#include "snmp.h"
#include "wine/debug.h"
/* a few asn.1 tags we need */
#define ASN_BITSTRING (ASN_UNIVERSAL | ASN_PRIMITIVE | 0x03)
#define ASN_OCTETSTRING (ASN_UNIVERSAL | ASN_PRIMITIVE | 0x04)
#define ASN_ENUMERATED (ASN_UNIVERSAL | ASN_PRIMITIVE | 0x0a)
#define ASN_SETOF (ASN_UNIVERSAL | ASN_PRIMITIVE | 0x11)
#define ASN_NUMERICSTRING (ASN_UNIVERSAL | ASN_PRIMITIVE | 0x12)
#define ASN_PRINTABLESTRING (ASN_UNIVERSAL | ASN_PRIMITIVE | 0x13)
#define ASN_IA5STRING (ASN_UNIVERSAL | ASN_PRIMITIVE | 0x16)
#define ASN_UTCTIME (ASN_UNIVERSAL | ASN_PRIMITIVE | 0x17)
#define ASN_GENERALTIME (ASN_UNIVERSAL | ASN_PRIMITIVE | 0x18)
WINE_DEFAULT_DEBUG_CHANNEL(crypt);
static const WCHAR szDllName[] = { 'D','l','l',0 };
static char *CRYPT_GetKeyName(DWORD dwEncodingType, LPCSTR pszFuncName,
LPCSTR pszOID)
{
static const char szEncodingTypeFmt[] =
"Software\\Microsoft\\Cryptography\\OID\\EncodingType %ld\\%s\\%s";
UINT len;
char numericOID[7]; /* enough for "#65535" */
const char *oid;
LPSTR szKey;
/* MSDN says the encoding type is a mask, but it isn't treated that way.
* (E.g., if dwEncodingType were 3, the key names "EncodingType 1" and
* "EncodingType 2" would be expected if it were a mask. Instead native
* stores values in "EncodingType 3".
*/
if (!HIWORD(pszOID))
{
snprintf(numericOID, sizeof(numericOID), "#%d", (int)pszOID);
oid = numericOID;
}
else
oid = pszOID;
/* This is enough: the lengths of the two string parameters are explicitly
* counted, and we need up to five additional characters for the encoding
* type. These are covered by the "%d", "%s", and "%s" characters in the
* format specifier that are removed by sprintf.
*/
len = sizeof(szEncodingTypeFmt) + lstrlenA(pszFuncName) + lstrlenA(oid);
szKey = HeapAlloc(GetProcessHeap(), 0, len);
if (szKey)
sprintf(szKey, szEncodingTypeFmt, dwEncodingType, pszFuncName, oid);
return szKey;
}
BOOL WINAPI CryptRegisterOIDFunction(DWORD dwEncodingType, LPCSTR pszFuncName,
LPCSTR pszOID, LPCWSTR pwszDll, LPCSTR pszOverrideFuncName)
{
LONG r;
HKEY hKey;
LPSTR szKey;
TRACE("%lx %s %s %s %s\n", dwEncodingType, pszFuncName, pszOID,
debugstr_w(pwszDll), pszOverrideFuncName);
/* This only registers functions for encoding certs, not messages */
if (!GET_CERT_ENCODING_TYPE(dwEncodingType))
return TRUE;
/* Native does nothing pwszDll is NULL */
if (!pwszDll)
return TRUE;
/* I'm not matching MS bug for bug here, because I doubt any app depends on
* it:
* - native "succeeds" if pszFuncName is NULL, but the nonsensical entry
* it creates would never be used
* - native returns an HRESULT rather than a Win32 error if pszOID is NULL.
* Instead I disallow both of these with ERROR_INVALID_PARAMETER.
*/
if (!pszFuncName || !pszOID)
{
SetLastError(ERROR_INVALID_PARAMETER);
return FALSE;
}
szKey = CRYPT_GetKeyName(dwEncodingType, pszFuncName, pszOID);
TRACE("Key name is %s\n", debugstr_a(szKey));
if (!szKey)
return FALSE;
r = RegCreateKeyA(HKEY_LOCAL_MACHINE, szKey, &hKey);
HeapFree(GetProcessHeap(), 0, szKey);
if(r != ERROR_SUCCESS)
return FALSE;
/* write the values */
if (pszOverrideFuncName)
RegSetValueExA(hKey, "FuncName", 0, REG_SZ, pszOverrideFuncName,
lstrlenA(pszOverrideFuncName) + 1);
RegSetValueExW(hKey, szDllName, 0, REG_SZ, (const BYTE*) pwszDll,
(lstrlenW(pwszDll) + 1) * sizeof (WCHAR));
RegCloseKey(hKey);
return TRUE;
}
BOOL WINAPI CryptUnregisterOIDFunction(DWORD dwEncodingType, LPCSTR pszFuncName,
LPCSTR pszOID)
{
LPSTR szKey;
LONG rc;
TRACE("%lx %s %s\n", dwEncodingType, pszFuncName, pszOID);
if (!GET_CERT_ENCODING_TYPE(dwEncodingType))
return TRUE;
if (!pszFuncName || !pszOID)
{
SetLastError(ERROR_INVALID_PARAMETER);
return FALSE;
}
szKey = CRYPT_GetKeyName(dwEncodingType, pszFuncName, pszOID);
rc = RegDeleteKeyA(HKEY_LOCAL_MACHINE, szKey);
HeapFree(GetProcessHeap(), 0, szKey);
if (rc)
SetLastError(rc);
return rc ? FALSE : TRUE;
}
BOOL WINAPI CryptGetOIDFunctionValue(DWORD dwEncodingType, LPCSTR pszFuncName,
LPCSTR pszOID, LPCWSTR pwszValueName, DWORD *pdwValueType, BYTE *pbValueData,
DWORD *pcbValueData)
{
LPSTR szKey;
LONG rc;
HKEY hKey;
TRACE("%lx %s %s %s %p %p %p\n", dwEncodingType, debugstr_a(pszFuncName),
debugstr_a(pszOID), debugstr_w(pwszValueName), pdwValueType, pbValueData,
pcbValueData);
if (!GET_CERT_ENCODING_TYPE(dwEncodingType))
return TRUE;
if (!pszFuncName || !pszOID || !pwszValueName)
{
SetLastError(ERROR_INVALID_PARAMETER);
return FALSE;
}
szKey = CRYPT_GetKeyName(dwEncodingType, pszFuncName, pszOID);
rc = RegOpenKeyA(HKEY_LOCAL_MACHINE, szKey, &hKey);
HeapFree(GetProcessHeap(), 0, szKey);
if (rc)
SetLastError(rc);
else
{
rc = RegQueryValueExW(hKey, pwszValueName, NULL, pdwValueType,
pbValueData, pcbValueData);
if (rc)
SetLastError(rc);
RegCloseKey(hKey);
}
return rc ? FALSE : TRUE;
}
BOOL WINAPI CryptSetOIDFunctionValue(DWORD dwEncodingType, LPCSTR pszFuncName,
LPCSTR pszOID, LPCWSTR pwszValueName, DWORD dwValueType,
const BYTE *pbValueData, DWORD cbValueData)
{
LPSTR szKey;
LONG rc;
HKEY hKey;
TRACE("%lx %s %s %s %ld %p %ld\n", dwEncodingType, debugstr_a(pszFuncName),
debugstr_a(pszOID), debugstr_w(pwszValueName), dwValueType, pbValueData,
cbValueData);
if (!GET_CERT_ENCODING_TYPE(dwEncodingType))
return TRUE;
if (!pszFuncName || !pszOID || !pwszValueName)
{
SetLastError(ERROR_INVALID_PARAMETER);
return FALSE;
}
szKey = CRYPT_GetKeyName(dwEncodingType, pszFuncName, pszOID);
rc = RegOpenKeyA(HKEY_LOCAL_MACHINE, szKey, &hKey);
HeapFree(GetProcessHeap(), 0, szKey);
if (rc)
SetLastError(rc);
else
{
rc = RegSetValueExW(hKey, pwszValueName, 0, dwValueType, pbValueData,
cbValueData);
if (rc)
SetLastError(rc);
RegCloseKey(hKey);
}
return rc ? FALSE : TRUE;
}
/* Gets the registered function named szFuncName for dwCertEncodingType and
* lpszStructType, or NULL if one could not be found. *lib will be set to the
* handle of the module it's in, or NULL if no module was loaded. If the
* return value is NULL, *lib will also be NULL, to simplify error handling.
*/
static void *CRYPT_GetFunc(DWORD dwCertEncodingType, LPCSTR lpszStructType,
LPCSTR szFuncName, HMODULE *lib)
{
void *ret = NULL;
char *szKey = CRYPT_GetKeyName(dwCertEncodingType, szFuncName,
lpszStructType);
const char *funcName;
long r;
HKEY hKey;
DWORD type, size = 0;
TRACE("(%08lx %s %s %p)\n", dwCertEncodingType, debugstr_a(lpszStructType),
debugstr_a(szFuncName), lib);
*lib = NULL;
r = RegOpenKeyA(HKEY_LOCAL_MACHINE, szKey, &hKey);
HeapFree(GetProcessHeap(), 0, szKey);
if(r != ERROR_SUCCESS)
return NULL;
RegQueryValueExA(hKey, "FuncName", NULL, &type, NULL, &size);
if (GetLastError() == ERROR_MORE_DATA && type == REG_SZ)
{
funcName = HeapAlloc(GetProcessHeap(), 0, size);
RegQueryValueExA(hKey, "FuncName", NULL, &type, (LPBYTE)funcName,
&size);
}
else
funcName = szFuncName;
RegQueryValueExW(hKey, szDllName, NULL, &type, NULL, &size);
if (GetLastError() == ERROR_MORE_DATA && type == REG_SZ)
{
LPWSTR dllName = HeapAlloc(GetProcessHeap(), 0, size);
RegQueryValueExW(hKey, szDllName, NULL, &type, (LPBYTE)dllName,
&size);
*lib = LoadLibraryW(dllName);
if (*lib)
{
ret = GetProcAddress(*lib, funcName);
if (!ret)
{
/* Unload the library, the caller doesn't want to unload it
* when the return value is NULL.
*/
FreeLibrary(*lib);
*lib = NULL;
}
}
HeapFree(GetProcessHeap(), 0, dllName);
}
if (funcName != szFuncName)
HeapFree(GetProcessHeap(), 0, (char *)funcName);
TRACE("returning %p\n", ret);
return ret;
}
typedef BOOL (WINAPI *CryptEncodeObjectFunc)(DWORD, LPCSTR, const void *,
BYTE *, DWORD *);
BOOL WINAPI CryptEncodeObject(DWORD dwCertEncodingType, LPCSTR lpszStructType,
const void *pvStructInfo, BYTE *pbEncoded, DWORD *pcbEncoded)
{
BOOL ret = FALSE;
HMODULE lib;
CryptEncodeObjectFunc pCryptEncodeObject;
TRACE("(0x%08lx, %s, %p, %p, %p)\n",
dwCertEncodingType, HIWORD(lpszStructType) ? debugstr_a(lpszStructType) :
"(integer value)", pvStructInfo, pbEncoded, pcbEncoded);
if (!pbEncoded && !pcbEncoded)
{
SetLastError(ERROR_INVALID_PARAMETER);
return FALSE;
}
/* Try registered DLL first.. */
pCryptEncodeObject =
(CryptEncodeObjectFunc)CRYPT_GetFunc(dwCertEncodingType,
lpszStructType, "CryptEncodeObject", &lib);
if (pCryptEncodeObject)
{
ret = pCryptEncodeObject(dwCertEncodingType, lpszStructType,
pvStructInfo, pbEncoded, pcbEncoded);
FreeLibrary(lib);
}
else
{
/* If not, use CryptEncodeObjectEx */
ret = CryptEncodeObjectEx(dwCertEncodingType, lpszStructType,
pvStructInfo, 0, NULL, pbEncoded, pcbEncoded);
}
return ret;
}
/* Helper function to check *pcbEncoded, set it to the required size, and
* optionally to allocate memory. Assumes pbEncoded is not NULL.
* If CRYPT_ENCODE_ALLOC_FLAG is set in dwFlags, *pbEncoded will be set to a
* pointer to the newly allocated memory.
*/
static BOOL CRYPT_EncodeEnsureSpace(DWORD dwFlags,
PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded,
DWORD bytesNeeded)
{
BOOL ret = TRUE;
if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
{
if (pEncodePara && pEncodePara->pfnAlloc)
*(BYTE **)pbEncoded = pEncodePara->pfnAlloc(bytesNeeded);
else
*(BYTE **)pbEncoded = LocalAlloc(0, bytesNeeded);
if (!*(BYTE **)pbEncoded)
ret = FALSE;
else
*pcbEncoded = bytesNeeded;
}
else if (bytesNeeded > *pcbEncoded)
{
*pcbEncoded = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
return ret;
}
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_AsnEncodeOid(DWORD dwCertEncodingType,
LPCSTR pszObjId, BYTE *pbEncoded, DWORD *pcbEncoded)
{
DWORD bytesNeeded = 0, lenBytes;
BOOL ret = TRUE;
int firstPos = 0;
BYTE firstByte = 0;
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 (*pbEncoded < 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_AsnEncodeNameValue(DWORD dwCertEncodingType,
CERT_NAME_VALUE *value, BYTE *pbEncoded, DWORD *pcbEncoded)
{
BYTE tag;
DWORD bytesNeeded, lenBytes, encodedLen;
BOOL ret = TRUE;
switch (value->dwValueType)
{
case CERT_RDN_NUMERIC_STRING:
tag = ASN_NUMERICSTRING;
encodedLen = value->Value.cbData;
break;
case CERT_RDN_PRINTABLE_STRING:
tag = ASN_PRINTABLESTRING;
encodedLen = value->Value.cbData;
break;
case CERT_RDN_IA5_STRING:
tag = ASN_IA5STRING;
encodedLen = value->Value.cbData;
break;
case CERT_RDN_ANY_TYPE:
/* explicitly disallowed */
SetLastError(HRESULT_FROM_WIN32(ERROR_INVALID_PARAMETER));
return FALSE;
default:
FIXME("String type %ld unimplemented\n", value->dwValueType);
return FALSE;
}
CRYPT_EncodeLen(encodedLen, NULL, &lenBytes);
bytesNeeded = 1 + lenBytes + encodedLen;
if (pbEncoded)
{
if (*pcbEncoded < bytesNeeded)
{
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
*pbEncoded++ = tag;
CRYPT_EncodeLen(encodedLen, pbEncoded, &lenBytes);
pbEncoded += lenBytes;
switch (value->dwValueType)
{
case CERT_RDN_NUMERIC_STRING:
case CERT_RDN_PRINTABLE_STRING:
case CERT_RDN_IA5_STRING:
memcpy(pbEncoded, value->Value.pbData, value->Value.cbData);
}
}
}
*pcbEncoded = bytesNeeded;
return ret;
}
static BOOL WINAPI CRYPT_AsnEncodeRdnAttr(DWORD dwCertEncodingType,
CERT_RDN_ATTR *attr, BYTE *pbEncoded, DWORD *pcbEncoded)
{
DWORD bytesNeeded = 0, lenBytes, size;
BOOL ret;
ret = CRYPT_AsnEncodeOid(dwCertEncodingType, attr->pszObjId, NULL, &size);
if (ret)
{
bytesNeeded += size;
/* hack: a CERT_RDN_ATTR is identical to a CERT_NAME_VALUE beginning
* with dwValueType, so "cast" it to get its encoded size
*/
ret = CRYPT_AsnEncodeNameValue(dwCertEncodingType,
(CERT_NAME_VALUE *)&attr->dwValueType, NULL, &size);
if (ret)
{
bytesNeeded += size;
CRYPT_EncodeLen(bytesNeeded, NULL, &lenBytes);
bytesNeeded += 1 + lenBytes;
if (pbEncoded)
{
if (*pcbEncoded < bytesNeeded)
{
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
*pbEncoded++ = ASN_CONSTRUCTOR | ASN_SEQUENCE;
CRYPT_EncodeLen(bytesNeeded - lenBytes - 1, pbEncoded,
&lenBytes);
pbEncoded += lenBytes;
size = bytesNeeded - 1 - lenBytes;
ret = CRYPT_AsnEncodeOid(dwCertEncodingType, attr->pszObjId,
pbEncoded, &size);
if (ret)
{
pbEncoded += size;
size = bytesNeeded - 1 - lenBytes - size;
ret = CRYPT_AsnEncodeNameValue(dwCertEncodingType,
(CERT_NAME_VALUE *)&attr->dwValueType, pbEncoded,
&size);
}
}
}
*pcbEncoded = bytesNeeded;
}
}
return ret;
}
static int BLOBComp(const void *l, const void *r)
{
CRYPT_DER_BLOB *a = (CRYPT_DER_BLOB *)l, *b = (CRYPT_DER_BLOB *)r;
int ret;
if (!(ret = memcmp(a->pbData, b->pbData, min(a->cbData, b->cbData))))
ret = a->cbData - b->cbData;
return ret;
}
/* This encodes as a SET OF, which in DER must be lexicographically sorted.
*/
static BOOL WINAPI CRYPT_AsnEncodeRdn(DWORD dwCertEncodingType, CERT_RDN *rdn,
BYTE *pbEncoded, DWORD *pcbEncoded)
{
DWORD bytesNeeded = 0, lenBytes, i;
BOOL ret;
CRYPT_DER_BLOB *blobs = NULL;
ret = TRUE;
if (rdn->cRDNAttr)
{
if (!rdn->rgRDNAttr)
{
SetLastError(STATUS_ACCESS_VIOLATION);
ret = FALSE;
}
else
{
blobs = HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
rdn->cRDNAttr * sizeof(CRYPT_DER_BLOB));
if (!blobs)
ret = FALSE;
}
}
for (i = 0; ret && i < rdn->cRDNAttr; i++)
{
ret = CRYPT_AsnEncodeRdnAttr(dwCertEncodingType, &rdn->rgRDNAttr[i],
NULL, &blobs[i].cbData);
if (ret)
bytesNeeded += blobs[i].cbData;
}
CRYPT_EncodeLen(bytesNeeded, NULL, &lenBytes);
bytesNeeded += 1 + lenBytes;
if (ret)
{
if (pbEncoded)
{
if (*pcbEncoded < bytesNeeded)
{
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
for (i = 0; ret && i < rdn->cRDNAttr; i++)
{
blobs[i].pbData = HeapAlloc(GetProcessHeap(), 0,
blobs[i].cbData);
if (!blobs[i].pbData)
ret = FALSE;
else
ret = CRYPT_AsnEncodeRdnAttr(dwCertEncodingType,
&rdn->rgRDNAttr[i], blobs[i].pbData, &blobs[i].cbData);
}
if (ret)
{
qsort(blobs, rdn->cRDNAttr, sizeof(CRYPT_DER_BLOB),
BLOBComp);
*pbEncoded++ = ASN_CONSTRUCTOR | ASN_SETOF;
CRYPT_EncodeLen(bytesNeeded - lenBytes - 1, pbEncoded,
&lenBytes);
pbEncoded += lenBytes;
for (i = 0; ret && i < rdn->cRDNAttr; i++)
{
memcpy(pbEncoded, blobs[i].pbData, blobs[i].cbData);
pbEncoded += blobs[i].cbData;
}
}
}
}
*pcbEncoded = bytesNeeded;
}
if (blobs)
{
for (i = 0; i < rdn->cRDNAttr; i++)
HeapFree(GetProcessHeap(), 0, blobs[i].pbData);
HeapFree(GetProcessHeap(), 0, blobs);
}
return ret;
}
static BOOL WINAPI CRYPT_AsnEncodeName(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded)
{
CERT_NAME_INFO *info = (CERT_NAME_INFO *)pvStructInfo;
DWORD bytesNeeded = 0, lenBytes, size, i;
BOOL ret;
if (!pvStructInfo)
{
SetLastError(STATUS_ACCESS_VIOLATION);
return FALSE;
}
if (info->cRDN && !info->rgRDN)
{
SetLastError(STATUS_ACCESS_VIOLATION);
return FALSE;
}
TRACE("encoding name with %ld RDNs\n", info->cRDN);
ret = TRUE;
for (i = 0; ret && i < info->cRDN; i++)
{
ret = CRYPT_AsnEncodeRdn(dwCertEncodingType, &info->rgRDN[i], NULL,
&size);
if (ret)
bytesNeeded += size;
}
CRYPT_EncodeLen(bytesNeeded, NULL, &lenBytes);
bytesNeeded += 1 + lenBytes;
if (ret)
{
if (!pbEncoded)
{
*pcbEncoded = bytesNeeded;
return TRUE;
}
if (!CRYPT_EncodeEnsureSpace(dwFlags, pEncodePara, pbEncoded,
pcbEncoded, bytesNeeded))
return FALSE;
if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
pbEncoded = *(BYTE **)pbEncoded;
/* FIXME: could this be encoded using X509_SEQUENCE_OF_ANY? */
*pbEncoded++ = ASN_CONSTRUCTOR | ASN_SEQUENCEOF;
CRYPT_EncodeLen(bytesNeeded - lenBytes - 1, pbEncoded, &size);
pbEncoded += size;
for (i = 0; ret && i < info->cRDN; i++)
{
size = bytesNeeded;
ret = CRYPT_AsnEncodeRdn(dwCertEncodingType, &info->rgRDN[i],
pbEncoded, &size);
if (ret)
{
pbEncoded += size;
bytesNeeded -= size;
}
}
}
return ret;
}
static BOOL WINAPI CRYPT_AsnEncodeOctets(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded)
{
CRYPT_DATA_BLOB *blob = (CRYPT_DATA_BLOB *)pvStructInfo;
DWORD bytesNeeded, lenBytes;
if (!pvStructInfo)
{
SetLastError(STATUS_ACCESS_VIOLATION);
return FALSE;
}
/* FIXME: use exception handling to catch bogus pointers */
CRYPT_EncodeLen(blob->cbData, NULL, &lenBytes);
bytesNeeded = 1 + lenBytes + blob->cbData;
if (!pbEncoded)
{
*pcbEncoded = bytesNeeded;
return TRUE;
}
if (!CRYPT_EncodeEnsureSpace(dwFlags, pEncodePara, pbEncoded, pcbEncoded,
bytesNeeded))
return FALSE;
if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
pbEncoded = *(BYTE **)pbEncoded;
*pbEncoded++ = ASN_OCTETSTRING;
CRYPT_EncodeLen(blob->cbData, pbEncoded, &lenBytes);
pbEncoded += lenBytes;
if (blob->cbData)
memcpy(pbEncoded, blob->pbData, blob->cbData);
return TRUE;
}
static BOOL WINAPI CRYPT_AsnEncodeBits(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded)
{
CRYPT_BIT_BLOB *blob = (CRYPT_BIT_BLOB *)pvStructInfo;
DWORD bytesNeeded, lenBytes, dataBytes;
BYTE unusedBits;
if (!pvStructInfo)
{
SetLastError(STATUS_ACCESS_VIOLATION);
return FALSE;
}
/* FIXME: use exception handling to catch bogus pointers */
/* yep, MS allows cUnusedBits to be >= 8 */
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;
return TRUE;
}
if (!CRYPT_EncodeEnsureSpace(dwFlags, pEncodePara, pbEncoded, pcbEncoded,
bytesNeeded))
return FALSE;
if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
pbEncoded = *(BYTE **)pbEncoded;
*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;
}
return TRUE;
}
static BOOL WINAPI CRYPT_AsnEncodeInt(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded)
{
INT val, i;
BYTE significantBytes, padByte = 0, bytesNeeded;
BOOL neg = FALSE, pad = FALSE;
if (!pvStructInfo)
{
SetLastError(STATUS_ACCESS_VIOLATION);
return FALSE;
}
memcpy(&val, pvStructInfo, sizeof(val));
/* Count the number of significant bytes. Temporarily swap sign for
* negatives so I count the minimum number of bytes.
*/
if (val < 0)
{
neg = TRUE;
val = -val;
}
for (significantBytes = sizeof(val); !(val & 0xff000000);
val <<= 8, significantBytes--)
;
if (neg)
{
val = -val;
if ((val & 0xff000000) < 0x80000000)
{
padByte = 0xff;
pad = TRUE;
}
}
else if ((val & 0xff000000) > 0x7f000000)
{
padByte = 0;
pad = TRUE;
}
bytesNeeded = 2 + significantBytes;
if (pad)
bytesNeeded++;
if (!pbEncoded)
{
*pcbEncoded = bytesNeeded;
return TRUE;
}
if (!CRYPT_EncodeEnsureSpace(dwFlags, pEncodePara, pbEncoded, pcbEncoded,
bytesNeeded))
return FALSE;
if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
pbEncoded = *(BYTE **)pbEncoded;
*pbEncoded++ = ASN_INTEGER;
if (pad)
{
*pbEncoded++ = significantBytes + 1;
*pbEncoded++ = padByte;
}
else
*pbEncoded++ = significantBytes;
for (i = 0; i < significantBytes; i++, val <<= 8)
*(pbEncoded + i) = (BYTE)((val & 0xff000000) >> 24);
return TRUE;
}
static BOOL WINAPI CRYPT_AsnEncodeInteger(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded)
{
DWORD significantBytes, lenBytes;
BYTE padByte = 0, bytesNeeded;
BOOL pad = FALSE;
CRYPT_INTEGER_BLOB *blob = (CRYPT_INTEGER_BLOB *)pvStructInfo;
if (!pvStructInfo)
{
SetLastError(STATUS_ACCESS_VIOLATION);
return FALSE;
}
/* FIXME: use exception handling to protect against bogus pointers */
significantBytes = blob->cbData;
if (significantBytes)
{
if (blob->pbData[significantBytes - 1] & 0x80)
{
/* negative, lop off leading (little-endian) 0xffs */
for (; significantBytes > 0 &&
blob->pbData[significantBytes - 1] == 0xff; significantBytes--)
;
if (blob->pbData[significantBytes - 1] < 0x80)
{
padByte = 0xff;
pad = TRUE;
}
}
else
{
/* positive, lop off leading (little-endian) zeroes */
for (; significantBytes > 0 && !blob->pbData[significantBytes - 1];
significantBytes--)
;
if (blob->pbData[significantBytes - 1] > 0x7f)
{
padByte = 0;
pad = TRUE;
}
}
}
if (pad)
CRYPT_EncodeLen(significantBytes + 1, NULL, &lenBytes);
else
CRYPT_EncodeLen(significantBytes, NULL, &lenBytes);
bytesNeeded = 1 + lenBytes + significantBytes;
if (pad)
bytesNeeded++;
if (!pbEncoded)
{
*pcbEncoded = bytesNeeded;
return TRUE;
}
if (!CRYPT_EncodeEnsureSpace(dwFlags, pEncodePara, pbEncoded, pcbEncoded,
bytesNeeded))
return FALSE;
if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
pbEncoded = *(BYTE **)pbEncoded;
*pbEncoded++ = ASN_INTEGER;
if (pad)
{
CRYPT_EncodeLen(significantBytes + 1, pbEncoded, &lenBytes);
pbEncoded += lenBytes;
*pbEncoded++ = padByte;
}
else
{
CRYPT_EncodeLen(significantBytes, pbEncoded, &lenBytes);
pbEncoded += lenBytes;
}
for (; significantBytes > 0; significantBytes--)
*(pbEncoded++) = blob->pbData[significantBytes - 1];
return TRUE;
}
static BOOL WINAPI CRYPT_AsnEncodeUnsignedInteger(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded)
{
DWORD significantBytes, lenBytes;
BYTE bytesNeeded;
BOOL pad = FALSE;
CRYPT_INTEGER_BLOB *blob = (CRYPT_INTEGER_BLOB *)pvStructInfo;
if (!pvStructInfo)
{
SetLastError(STATUS_ACCESS_VIOLATION);
return FALSE;
}
/* FIXME: use exception handling to protect against bogus pointers */
significantBytes = blob->cbData;
if (significantBytes)
{
/* positive, lop off leading (little-endian) zeroes */
for (; significantBytes > 0 && !blob->pbData[significantBytes - 1];
significantBytes--)
;
if (blob->pbData[significantBytes - 1] > 0x7f)
pad = TRUE;
}
if (pad)
CRYPT_EncodeLen(significantBytes + 1, NULL, &lenBytes);
else
CRYPT_EncodeLen(significantBytes, NULL, &lenBytes);
bytesNeeded = 1 + lenBytes + significantBytes;
if (pad)
bytesNeeded++;
if (!pbEncoded)
{
*pcbEncoded = bytesNeeded;
return TRUE;
}
if (!CRYPT_EncodeEnsureSpace(dwFlags, pEncodePara, pbEncoded, pcbEncoded,
bytesNeeded))
return FALSE;
if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
pbEncoded = *(BYTE **)pbEncoded;
*pbEncoded++ = ASN_INTEGER;
if (pad)
{
CRYPT_EncodeLen(significantBytes + 1, pbEncoded, &lenBytes);
pbEncoded += lenBytes;
*pbEncoded++ = 0;
}
else
{
CRYPT_EncodeLen(significantBytes, pbEncoded, &lenBytes);
pbEncoded += lenBytes;
}
for (; significantBytes > 0; significantBytes--)
*(pbEncoded++) = blob->pbData[significantBytes - 1];
return TRUE;
}
static BOOL WINAPI CRYPT_AsnEncodeEnumerated(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded)
{
CRYPT_INTEGER_BLOB blob;
BOOL ret;
/* Encode as an unsigned integer, then change the tag to enumerated */
blob.cbData = sizeof(DWORD);
blob.pbData = (BYTE *)pvStructInfo;
ret = CRYPT_AsnEncodeUnsignedInteger(dwCertEncodingType,
X509_MULTI_BYTE_UINT, &blob, dwFlags, pEncodePara, pbEncoded, pcbEncoded);
if (ret && pbEncoded)
{
if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
pbEncoded = *(BYTE **)pbEncoded;
pbEncoded[0] = ASN_ENUMERATED;
}
return ret;
}
static BOOL WINAPI CRYPT_AsnEncodeUtcTime(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded)
{
SYSTEMTIME sysTime;
/* sorry, magic number: enough for tag, len, YYMMDDHHMMSSZ\0. I use a
* temporary buffer because the output buffer is not NULL-terminated.
*/
char buf[16];
static const DWORD bytesNeeded = sizeof(buf) - 1;
if (!pvStructInfo)
{
SetLastError(STATUS_ACCESS_VIOLATION);
return FALSE;
}
/* Sanity check the year, this is a two-digit year format */
if (!FileTimeToSystemTime((const FILETIME *)pvStructInfo, &sysTime))
return FALSE;
if (sysTime.wYear < 1950 || sysTime.wYear > 2050)
{
SetLastError(CRYPT_E_BAD_ENCODE);
return FALSE;
}
if (!pbEncoded)
{
*pcbEncoded = bytesNeeded;
return TRUE;
}
if (!CRYPT_EncodeEnsureSpace(dwFlags, pEncodePara, pbEncoded, pcbEncoded,
bytesNeeded))
return FALSE;
if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
pbEncoded = *(BYTE **)pbEncoded;
buf[0] = ASN_UTCTIME;
buf[1] = bytesNeeded - 2;
snprintf(buf + 2, sizeof(buf) - 2, "%02d%02d%02d%02d%02d%02dZ",
sysTime.wYear >= 2000 ? sysTime.wYear - 2000 : sysTime.wYear - 1900,
sysTime.wDay, sysTime.wMonth, sysTime.wHour, sysTime.wMinute,
sysTime.wSecond);
memcpy(pbEncoded, buf, bytesNeeded);
return TRUE;
}
static BOOL WINAPI CRYPT_AsnEncodeGeneralizedTime(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded)
{
SYSTEMTIME sysTime;
/* sorry, magic number: enough for tag, len, YYYYMMDDHHMMSSZ\0. I use a
* temporary buffer because the output buffer is not NULL-terminated.
*/
char buf[18];
static const DWORD bytesNeeded = sizeof(buf) - 1;
if (!pvStructInfo)
{
SetLastError(STATUS_ACCESS_VIOLATION);
return FALSE;
}
if (!pbEncoded)
{
*pcbEncoded = bytesNeeded;
return TRUE;
}
if (!FileTimeToSystemTime((const FILETIME *)pvStructInfo, &sysTime))
return FALSE;
if (!CRYPT_EncodeEnsureSpace(dwFlags, pEncodePara, pbEncoded, pcbEncoded,
bytesNeeded))
return FALSE;
if (dwFlags & CRYPT_ENCODE_ALLOC_FLAG)
pbEncoded = *(BYTE **)pbEncoded;
buf[0] = ASN_GENERALTIME;
buf[1] = bytesNeeded - 2;
snprintf(buf + 2, sizeof(buf) - 2, "%04d%02d%02d%02d%02d%02dZ",
sysTime.wYear, sysTime.wDay, sysTime.wMonth, sysTime.wHour,
sysTime.wMinute, sysTime.wSecond);
memcpy(pbEncoded, buf, bytesNeeded);
return TRUE;
}
static BOOL WINAPI CRYPT_AsnEncodeChoiceOfTime(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const void *pvStructInfo, DWORD dwFlags,
PCRYPT_ENCODE_PARA pEncodePara, BYTE *pbEncoded, DWORD *pcbEncoded)
{
SYSTEMTIME sysTime;
BOOL ret;
if (!pvStructInfo)
{
SetLastError(STATUS_ACCESS_VIOLATION);
return FALSE;
}
/* Check the year, if it's in the UTCTime range call that encode func */
if (!FileTimeToSystemTime((const FILETIME *)pvStructInfo, &sysTime))
return FALSE;
if (sysTime.wYear >= 1950 && sysTime.wYear <= 2050)
ret = CRYPT_AsnEncodeUtcTime(dwCertEncodingType, lpszStructType,
pvStructInfo, dwFlags, pEncodePara, pbEncoded, pcbEncoded);
else
ret = CRYPT_AsnEncodeGeneralizedTime(dwCertEncodingType,
lpszStructType, pvStructInfo, dwFlags, pEncodePara, pbEncoded,
pcbEncoded);
return ret;
}
typedef BOOL (WINAPI *CryptEncodeObjectExFunc)(DWORD, LPCSTR, const void *,
DWORD, PCRYPT_ENCODE_PARA, BYTE *, DWORD *);
BOOL WINAPI CryptEncodeObjectEx(DWORD dwCertEncodingType, LPCSTR lpszStructType,
const void *pvStructInfo, DWORD dwFlags, PCRYPT_ENCODE_PARA pEncodePara,
void *pvEncoded, DWORD *pcbEncoded)
{
BOOL ret = FALSE;
HMODULE lib = NULL;
CryptEncodeObjectExFunc encodeFunc = NULL;
TRACE("(0x%08lx, %s, %p, 0x%08lx, %p, %p, %p)\n",
dwCertEncodingType, HIWORD(lpszStructType) ? debugstr_a(lpszStructType) :
"(integer value)", pvStructInfo, dwFlags, pEncodePara, pvEncoded,
pcbEncoded);
if (!pvEncoded && !pcbEncoded)
{
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;
}
SetLastError(NOERROR);
if (!HIWORD(lpszStructType))
{
switch (LOWORD(lpszStructType))
{
case (WORD)X509_NAME:
encodeFunc = CRYPT_AsnEncodeName;
break;
case (WORD)X509_OCTET_STRING:
encodeFunc = CRYPT_AsnEncodeOctets;
break;
case (WORD)X509_BITS:
case (WORD)X509_KEY_USAGE:
encodeFunc = CRYPT_AsnEncodeBits;
break;
case (WORD)X509_INTEGER:
encodeFunc = CRYPT_AsnEncodeInt;
break;
case (WORD)X509_MULTI_BYTE_INTEGER:
encodeFunc = CRYPT_AsnEncodeInteger;
break;
case (WORD)X509_MULTI_BYTE_UINT:
encodeFunc = CRYPT_AsnEncodeUnsignedInteger;
break;
case (WORD)X509_ENUMERATED:
encodeFunc = CRYPT_AsnEncodeEnumerated;
break;
case (WORD)X509_CHOICE_OF_TIME:
encodeFunc = CRYPT_AsnEncodeChoiceOfTime;
break;
case (WORD)PKCS_UTC_TIME:
encodeFunc = CRYPT_AsnEncodeUtcTime;
break;
default:
FIXME("%d: unimplemented\n", LOWORD(lpszStructType));
}
}
else if (!strcmp(lpszStructType, szOID_RSA_signingTime))
encodeFunc = CRYPT_AsnEncodeUtcTime;
else if (!strcmp(lpszStructType, szOID_CRL_REASON_CODE))
encodeFunc = CRYPT_AsnEncodeEnumerated;
else if (!strcmp(lpszStructType, szOID_KEY_USAGE))
encodeFunc = CRYPT_AsnEncodeBits;
else if (!strcmp(lpszStructType, szOID_SUBJECT_KEY_IDENTIFIER))
encodeFunc = CRYPT_AsnEncodeOctets;
else
TRACE("OID %s not found or unimplemented, looking for DLL\n",
debugstr_a(lpszStructType));
if (!encodeFunc)
encodeFunc = (CryptEncodeObjectExFunc)CRYPT_GetFunc(dwCertEncodingType,
lpszStructType, "CryptEncodeObjectEx", &lib);
if (encodeFunc)
ret = encodeFunc(dwCertEncodingType, lpszStructType, pvStructInfo,
dwFlags, pEncodePara, pvEncoded, pcbEncoded);
else
SetLastError(ERROR_FILE_NOT_FOUND);
if (lib)
FreeLibrary(lib);
return ret;
}
typedef BOOL (WINAPI *CryptDecodeObjectFunc)(DWORD, LPCSTR, const BYTE *,
DWORD, DWORD, void *, DWORD *);
BOOL WINAPI CryptDecodeObject(DWORD dwCertEncodingType, LPCSTR lpszStructType,
const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags, void *pvStructInfo,
DWORD *pcbStructInfo)
{
BOOL ret = FALSE;
HMODULE lib;
CryptDecodeObjectFunc pCryptDecodeObject;
TRACE("(0x%08lx, %s, %p, %ld, 0x%08lx, %p, %p)\n",
dwCertEncodingType, HIWORD(lpszStructType) ? debugstr_a(lpszStructType) :
"(integer value)", pbEncoded, cbEncoded, dwFlags, pvStructInfo,
pcbStructInfo);
if (!pvStructInfo && !pcbStructInfo)
{
SetLastError(ERROR_INVALID_PARAMETER);
return FALSE;
}
/* Try registered DLL first.. */
pCryptDecodeObject =
(CryptDecodeObjectFunc)CRYPT_GetFunc(dwCertEncodingType,
lpszStructType, "CryptDecodeObject", &lib);
if (pCryptDecodeObject)
{
ret = pCryptDecodeObject(dwCertEncodingType, lpszStructType,
pbEncoded, cbEncoded, dwFlags, pvStructInfo, pcbStructInfo);
FreeLibrary(lib);
}
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_EOD);
ret = FALSE;
}
else if (pbEncoded[1] <= 0x7f)
{
*len = pbEncoded[1];
ret = TRUE;
}
else
{
BYTE lenLen = GET_LEN_BYTES(pbEncoded[1]);
if (lenLen > sizeof(DWORD))
{
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;
}
/* FIXME: honor the CRYPT_DECODE_SHARE_OID_FLAG. */
static BOOL WINAPI CRYPT_AsnDecodeOid(DWORD dwCertEncodingType,
const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags, LPSTR pszObjId,
DWORD *pcbObjId)
{
BOOL ret = TRUE;
DWORD bytesNeeded, dataLen;
BYTE lenBytes;
if (!CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen))
return FALSE;
if (pbEncoded[0] != ASN_OBJECTIDENTIFIER)
{
SetLastError(CRYPT_E_ASN1_BADTAG);
return FALSE;
}
lenBytes = GET_LEN_BYTES(pbEncoded[1]);
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 (!pszObjId)
*pcbObjId = bytesNeeded;
else if (*pcbObjId < bytesNeeded)
{
*pcbObjId = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
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
bytesNeeded = 0;
*pcbObjId = bytesNeeded;
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,
const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags, CERT_NAME_VALUE *value,
DWORD *pcbValue)
{
DWORD bytesNeeded, dataLen;
BOOL ret = TRUE;
BYTE lenBytes;
if (!CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen))
return FALSE;
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);
return FALSE;
}
bytesNeeded = sizeof(CERT_NAME_VALUE);
if (dataLen)
{
switch (pbEncoded[0])
{
case ASN_NUMERICSTRING:
case ASN_PRINTABLESTRING:
case ASN_IA5STRING:
if (!(dwFlags & CRYPT_DECODE_NOCOPY_FLAG))
bytesNeeded += dataLen;
break;
}
}
if (!value)
{
*pcbValue = bytesNeeded;
return TRUE;
}
if (*pcbValue < bytesNeeded)
{
*pcbValue = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
return FALSE;
}
*pcbValue = 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
{
if (!value->Value.pbData)
{
SetLastError(CRYPT_E_ASN1_INTERNAL);
ret = FALSE;
}
else
memcpy(value->Value.pbData, pbEncoded + 1 + lenBytes,
dataLen);
}
break;
}
}
else
{
value->Value.cbData = 0;
value->Value.pbData = NULL;
}
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeRdnAttr(DWORD dwCertEncodingType,
const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags, CERT_RDN_ATTR *attr,
DWORD *pcbAttr)
{
BOOL ret = TRUE;
DWORD bytesNeeded, dataLen, size;
BYTE lenBytes;
if (!CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen))
return FALSE;
/* The data length must be at least 4, two for the tag and length for the
* OID, and two for the string (assuming both have short-form lengths.)
*/
if (dataLen < 4)
{
SetLastError(CRYPT_E_ASN1_EOD);
return FALSE;
}
if (pbEncoded[0] != (ASN_CONSTRUCTOR | ASN_SEQUENCE))
{
SetLastError(CRYPT_E_ASN1_BADTAG);
return FALSE;
}
bytesNeeded = sizeof(CERT_RDN_ATTR);
lenBytes = GET_LEN_BYTES(pbEncoded[1]);
ret = CRYPT_AsnDecodeOid(dwCertEncodingType, pbEncoded + 1 + lenBytes,
cbEncoded - 1 - lenBytes, dwFlags, NULL, &size);
if (ret)
{
/* ugly: need to know the size of the next element of the sequence,
* so get it directly
*/
DWORD objIdOfset = 1 + lenBytes, objIdLen, nameValueOffset = 0;
ret = CRYPT_GetLen(pbEncoded + objIdOfset, cbEncoded - objIdOfset,
&objIdLen);
bytesNeeded += size;
/* hack: like encoding, this takes advantage of the fact that the rest
* of the structure is identical to a CERT_NAME_VALUE.
*/
if (ret)
{
nameValueOffset = objIdOfset + objIdLen + 1 +
GET_LEN_BYTES(pbEncoded[objIdOfset]);
ret = CRYPT_AsnDecodeNameValue(dwCertEncodingType,
pbEncoded + nameValueOffset, cbEncoded - nameValueOffset, dwFlags,
NULL, &size);
}
if (ret)
{
bytesNeeded += size;
if (!attr)
*pcbAttr = bytesNeeded;
else if (*pcbAttr < bytesNeeded)
{
*pcbAttr = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
ret = FALSE;
}
else
{
BYTE *originalData = attr->Value.pbData;
*pcbAttr = bytesNeeded;
/* strange: decode the value first, because it has a counted
* size, and we can store the OID after it. Keep track of the
* original data pointer, we'll need to know whether it was
* changed.
*/
size = bytesNeeded;
ret = CRYPT_AsnDecodeNameValue(dwCertEncodingType,
pbEncoded + nameValueOffset, cbEncoded - nameValueOffset,
dwFlags, (CERT_NAME_VALUE *)&attr->dwValueType, &size);
if (ret)
{
if (objIdLen)
{
/* if the data were copied to the original location,
* the OID goes after. Otherwise it goes in the
* spot originally reserved for the data.
*/
if (attr->Value.pbData == originalData)
attr->pszObjId = (LPSTR)(attr->Value.pbData +
attr->Value.cbData);
else
attr->pszObjId = originalData;
size = bytesNeeded - size;
ret = CRYPT_AsnDecodeOid(dwCertEncodingType,
pbEncoded + objIdOfset, cbEncoded - objIdOfset,
dwFlags, attr->pszObjId, &size);
}
else
attr->pszObjId = NULL;
}
}
}
}
return ret;
}
static BOOL WINAPI CRYPT_AsnDecodeRdn(DWORD dwCertEncodingType,
const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags, CERT_RDN *rdn,
DWORD *pcbRdn)
{
BOOL ret = TRUE;
DWORD bytesNeeded, dataLen, cRDNAttr = 0;
BYTE lenBytes;
if (!CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen))
return FALSE;
if (pbEncoded[0] != (ASN_CONSTRUCTOR | ASN_SETOF))
{
SetLastError(CRYPT_E_ASN1_BADTAG);
return FALSE;
}
lenBytes = GET_LEN_BYTES(pbEncoded[1]);
bytesNeeded = sizeof(CERT_RDN);
if (dataLen)
{
const BYTE *ptr;
DWORD size;
for (ptr = pbEncoded + 1 + lenBytes; ret &&
ptr - pbEncoded - 1 - lenBytes < dataLen; )
{
ret = CRYPT_AsnDecodeRdnAttr(dwCertEncodingType, ptr,
cbEncoded - (ptr - pbEncoded), dwFlags, NULL, &size);
if (ret)
{
DWORD nextLen;
cRDNAttr++;
bytesNeeded += size;
ret = CRYPT_GetLen(ptr, cbEncoded - (ptr - pbEncoded),
&nextLen);
if (ret)
ptr += nextLen + 1 + GET_LEN_BYTES(ptr[1]);
}
}
}
if (ret)
{
if (!rdn)
{
*pcbRdn = bytesNeeded;
return TRUE;
}
if (*pcbRdn < bytesNeeded)
{
*pcbRdn = bytesNeeded;
SetLastError(ERROR_MORE_DATA);
return FALSE;
}
*pcbRdn = bytesNeeded;
rdn->cRDNAttr = cRDNAttr;
if (rdn->cRDNAttr == 0)
rdn->rgRDNAttr = NULL;
else
{
DWORD size, i;
BYTE *nextData;
const BYTE *ptr;
rdn->rgRDNAttr = (CERT_RDN_ATTR *)((BYTE *)rdn + sizeof(CERT_RDN));
nextData = (BYTE *)rdn->rgRDNAttr +
rdn->cRDNAttr * sizeof(CERT_RDN_ATTR);
for (i = 0, ptr = pbEncoded + 1 + lenBytes; ret && i < cRDNAttr &&
ptr - pbEncoded - 1 - lenBytes < dataLen; i++)
{
rdn->rgRDNAttr[i].Value.pbData = nextData;
size = bytesNeeded;
ret = CRYPT_AsnDecodeRdnAttr(dwCertEncodingType, ptr,
cbEncoded - (ptr - pbEncoded), dwFlags, &rdn->rgRDNAttr[i],
&size);
if (ret)
{
DWORD nextLen;
bytesNeeded -= size;
/* If dwFlags & CRYPT_DECODE_NOCOPY_FLAG, the data may not
* have been copied.
*/
if (rdn->rgRDNAttr[i].Value.pbData == nextData)
nextData += rdn->rgRDNAttr[i].Value.cbData;
/* Ugly: the OID, if copied, is stored in memory after the
* value, so increment by its string length if it's set and
* points here.
*/
if ((const BYTE *)rdn->rgRDNAttr[i].pszObjId == nextData)
nextData += strlen(rdn->rgRDNAttr[i].pszObjId) + 1;
ret = CRYPT_GetLen(ptr, cbEncoded - (ptr - pbEncoded),
&nextLen);
if (ret)
ptr += nextLen + 1 + GET_LEN_BYTES(ptr[1]);
}
}
}
}
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;
DWORD bytesNeeded, dataLen, cRDN = 0;
BYTE lenBytes;
if (!pbEncoded)
{
SetLastError(CRYPT_E_ASN1_EOD);
return FALSE;
}
if (!CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen))
return FALSE;
if (pbEncoded[0] != (ASN_CONSTRUCTOR | ASN_SEQUENCEOF))
{
SetLastError(CRYPT_E_ASN1_BADTAG);
return FALSE;
}
lenBytes = GET_LEN_BYTES(pbEncoded[1]);
bytesNeeded = sizeof(CERT_NAME_INFO);
if (dataLen)
{
const BYTE *ptr;
DWORD size;
for (ptr = pbEncoded + 1 + lenBytes; ret && ptr - pbEncoded - 1 -
lenBytes < dataLen; )
{
ret = CRYPT_AsnDecodeRdn(dwCertEncodingType, ptr,
cbEncoded - (ptr - pbEncoded), dwFlags, NULL, &size);
if (ret)
{
DWORD nextLen;
cRDN++;
bytesNeeded += size;
ret = CRYPT_GetLen(ptr, cbEncoded - (ptr - pbEncoded),
&nextLen);
if (ret)
ptr += nextLen + 1 + GET_LEN_BYTES(ptr[1]);
}
}
}
if (ret)
{
CERT_NAME_INFO *info;
if (!pvStructInfo)
{
*pcbStructInfo = bytesNeeded;
return TRUE;
}
if (!CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara, pvStructInfo,
pcbStructInfo, bytesNeeded))
return FALSE;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
info = (CERT_NAME_INFO *)pvStructInfo;
info->cRDN = cRDN;
if (info->cRDN == 0)
info->rgRDN = NULL;
else
{
DWORD size, i;
BYTE *nextData;
const BYTE *ptr;
info->rgRDN = (CERT_RDN *)((BYTE *)pvStructInfo +
sizeof(CERT_NAME_INFO));
nextData = (BYTE *)info->rgRDN + info->cRDN * sizeof(CERT_RDN);
for (i = 0, ptr = pbEncoded + 1 + lenBytes; ret && i < cRDN &&
ptr - pbEncoded - 1 - lenBytes < dataLen; i++)
{
info->rgRDN[i].rgRDNAttr = (CERT_RDN_ATTR *)nextData;
size = bytesNeeded;
ret = CRYPT_AsnDecodeRdn(dwCertEncodingType, ptr,
cbEncoded - (ptr - pbEncoded), dwFlags, &info->rgRDN[i],
&size);
if (ret)
{
DWORD nextLen;
nextData += size;
bytesNeeded -= size;
ret = CRYPT_GetLen(ptr, cbEncoded - (ptr - pbEncoded),
&nextLen);
if (ret)
ptr += nextLen + 1 + GET_LEN_BYTES(ptr[1]);
}
}
}
}
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)
{
CRYPT_DATA_BLOB *blob;
DWORD bytesNeeded, dataLen;
if (!pbEncoded)
{
SetLastError(CRYPT_E_ASN1_EOD);
return FALSE;
}
if (!CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen))
return FALSE;
if (pbEncoded[0] != ASN_OCTETSTRING)
{
SetLastError(CRYPT_E_ASN1_BADTAG);
return FALSE;
}
if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
bytesNeeded = sizeof(CRYPT_DATA_BLOB);
else
bytesNeeded = dataLen + sizeof(CRYPT_DATA_BLOB);
if (!pvStructInfo)
{
*pcbStructInfo = bytesNeeded;
return TRUE;
}
if (!CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara, pvStructInfo,
pcbStructInfo, bytesNeeded))
return FALSE;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
blob = (CRYPT_DATA_BLOB *)pvStructInfo;
blob->cbData = dataLen;
if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
blob->pbData = (BYTE *)pbEncoded + 1 + GET_LEN_BYTES(pbEncoded[1]);
else
{
blob->pbData = (BYTE *)pvStructInfo + sizeof(CRYPT_DATA_BLOB);
if (blob->cbData)
memcpy(blob->pbData, pbEncoded + 1 + GET_LEN_BYTES(pbEncoded[1]),
blob->cbData);
}
return TRUE;
}
static BOOL WINAPI CRYPT_AsnDecodeBits(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
CRYPT_BIT_BLOB *blob;
DWORD bytesNeeded, dataLen;
if (!pbEncoded)
{
SetLastError(CRYPT_E_ASN1_EOD);
return FALSE;
}
if (!CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen))
return FALSE;
if (pbEncoded[0] != ASN_BITSTRING)
{
SetLastError(CRYPT_E_ASN1_BADTAG);
return FALSE;
}
if (dwFlags & CRYPT_DECODE_NOCOPY_FLAG)
bytesNeeded = sizeof(CRYPT_BIT_BLOB);
else
bytesNeeded = dataLen - 1 + sizeof(CRYPT_BIT_BLOB);
if (!pvStructInfo)
{
*pcbStructInfo = bytesNeeded;
return TRUE;
}
if (!CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara, pvStructInfo,
pcbStructInfo, bytesNeeded))
return FALSE;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
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
{
blob->pbData = (BYTE *)pvStructInfo + sizeof(CRYPT_BIT_BLOB);
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;
}
}
return TRUE;
}
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;
if (!pbEncoded || !cbEncoded)
{
SetLastError(CRYPT_E_ASN1_EOD);
return FALSE;
}
if (!pvStructInfo)
{
*pcbStructInfo = sizeof(int);
return TRUE;
}
if (pbEncoded[0] != ASN_INTEGER)
{
SetLastError(CRYPT_E_ASN1_BADTAG);
return FALSE;
}
if (cbEncoded <= 1)
{
SetLastError(CRYPT_E_ASN1_EOD);
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 (!CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara, pvStructInfo,
pcbStructInfo, sizeof(int)))
return FALSE;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
memcpy(pvStructInfo, &val, sizeof(int));
return TRUE;
}
static BOOL WINAPI CRYPT_AsnDecodeInteger(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
DWORD bytesNeeded, dataLen;
BYTE lenBytes;
CRYPT_INTEGER_BLOB *blob;
if (!pbEncoded)
{
SetLastError(CRYPT_E_ASN1_EOD);
return FALSE;
}
if (!CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen))
return FALSE;
if (pbEncoded[0] != ASN_INTEGER)
{
SetLastError(CRYPT_E_ASN1_BADTAG);
return FALSE;
}
lenBytes = GET_LEN_BYTES(pbEncoded[1]);
bytesNeeded = dataLen + sizeof(CRYPT_INTEGER_BLOB);
if (!pvStructInfo)
{
*pcbStructInfo = bytesNeeded;
return TRUE;
}
if (!CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara, pvStructInfo,
pcbStructInfo, bytesNeeded))
return FALSE;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
blob = (CRYPT_INTEGER_BLOB *)pvStructInfo;
blob->cbData = dataLen;
blob->pbData = (BYTE *)pvStructInfo + sizeof(CRYPT_INTEGER_BLOB);
if (blob->cbData)
{
DWORD i;
for (i = 0; i < blob->cbData; i++)
blob->pbData[i] = *(pbEncoded + 1 + lenBytes + dataLen - i - 1);
}
return TRUE;
}
static BOOL WINAPI CRYPT_AsnDecodeUnsignedInteger(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
DWORD bytesNeeded, dataLen;
BYTE lenBytes;
CRYPT_INTEGER_BLOB *blob;
if (!pbEncoded)
{
SetLastError(CRYPT_E_ASN1_EOD);
return FALSE;
}
if (!CRYPT_GetLen(pbEncoded, cbEncoded, &dataLen))
return FALSE;
if (pbEncoded[0] != ASN_INTEGER)
{
SetLastError(CRYPT_E_ASN1_BADTAG);
return FALSE;
}
lenBytes = GET_LEN_BYTES(pbEncoded[1]);
bytesNeeded = dataLen + sizeof(CRYPT_INTEGER_BLOB);
if (!pvStructInfo)
{
*pcbStructInfo = bytesNeeded;
return TRUE;
}
if (!CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara, pvStructInfo,
pcbStructInfo, bytesNeeded))
return FALSE;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
blob = (CRYPT_INTEGER_BLOB *)pvStructInfo;
blob->cbData = dataLen;
blob->pbData = (BYTE *)pvStructInfo + sizeof(CRYPT_INTEGER_BLOB);
/* 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 + pbEncoded[1] - i -
1);
}
return TRUE;
}
static BOOL WINAPI CRYPT_AsnDecodeEnumerated(DWORD dwCertEncodingType,
LPCSTR lpszStructType, const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
unsigned int val = 0, i;
/* Based on CRYPT_AsnDecodeInt, but interprets as unsigned */
if (!pbEncoded || !cbEncoded)
{
SetLastError(CRYPT_E_ASN1_EOD);
return FALSE;
}
if (!pvStructInfo)
{
*pcbStructInfo = sizeof(int);
return TRUE;
}
if (pbEncoded[0] != ASN_ENUMERATED)
{
SetLastError(CRYPT_E_ASN1_BADTAG);
return FALSE;
}
if (cbEncoded <= 1)
{
SetLastError(CRYPT_E_ASN1_EOD);
return FALSE;
}
if (pbEncoded[1] == 0)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
return FALSE;
}
/* 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 (!CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara, pvStructInfo,
pcbStructInfo, sizeof(unsigned int)))
return FALSE;
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
memcpy(pvStructInfo, &val, sizeof(unsigned int));
return TRUE;
}
#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); \
return FALSE; \
} \
(word) *= 10; \
(word) += *(pbEncoded)++ - '0'; \
} \
} while (0)
static BOOL CRYPT_AsnDecodeTimeZone(const BYTE *pbEncoded, DWORD len,
SYSTEMTIME *sysTime)
{
BOOL ret = TRUE;
if (len >= 3 && (*pbEncoded == '+' || *pbEncoded == '-'))
{
WORD hours, minutes = 0;
BYTE sign = *pbEncoded++;
len--;
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, hours);
if (hours >= 24)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
goto end;
}
if (len >= 2)
{
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, minutes);
if (minutes >= 60)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
ret = FALSE;
goto end;
}
}
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;
}
}
end:
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)
{
SYSTEMTIME sysTime = { 0 };
BYTE len;
BOOL ret = TRUE;
if (!pbEncoded || !cbEncoded)
{
SetLastError(CRYPT_E_ASN1_EOD);
return FALSE;
}
if (!pvStructInfo)
{
*pcbStructInfo = sizeof(FILETIME);
return TRUE;
}
if (pbEncoded[0] != ASN_UTCTIME)
{
SetLastError(CRYPT_E_ASN1_BADTAG);
return FALSE;
}
if (cbEncoded <= 1)
{
SetLastError(CRYPT_E_ASN1_EOD);
return FALSE;
}
if (pbEncoded[1] > 0x7f)
{
/* long-form date strings really can't be valid */
SetLastError(CRYPT_E_ASN1_CORRUPT);
return FALSE;
}
len = pbEncoded[1];
if (len < MIN_ENCODED_TIME_LENGTH)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
return FALSE;
}
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 (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);
ret = CRYPT_AsnDecodeTimeZone(pbEncoded, len, &sysTime);
}
if (ret)
{
if (!CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara, pvStructInfo,
pcbStructInfo, sizeof(FILETIME)))
ret = FALSE;
else
{
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
ret = SystemTimeToFileTime(&sysTime, (FILETIME *)pvStructInfo);
}
}
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)
{
SYSTEMTIME sysTime = { 0 };
BYTE len;
BOOL ret = TRUE;
if (!pbEncoded || !cbEncoded)
{
SetLastError(CRYPT_E_ASN1_EOD);
return FALSE;
}
if (!pvStructInfo)
{
*pcbStructInfo = sizeof(FILETIME);
return TRUE;
}
if (pbEncoded[0] != ASN_GENERALTIME)
{
SetLastError(CRYPT_E_ASN1_BADTAG);
return FALSE;
}
if (cbEncoded <= 1)
{
SetLastError(CRYPT_E_ASN1_EOD);
return FALSE;
}
if (pbEncoded[1] > 0x7f)
{
/* long-form date strings really can't be valid */
SetLastError(CRYPT_E_ASN1_CORRUPT);
return FALSE;
}
len = pbEncoded[1];
if (len < MIN_ENCODED_TIME_LENGTH)
{
SetLastError(CRYPT_E_ASN1_CORRUPT);
return FALSE;
}
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 (len > 0)
{
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wMinute);
if (len > 0)
CRYPT_TIME_GET_DIGITS(pbEncoded, len, 2, sysTime.wSecond);
if (len > 0 && (*pbEncoded == '.' || *pbEncoded == ','))
{
BYTE digits;
pbEncoded++;
len--;
digits = min(len, 3); /* workaround macro weirdness */
CRYPT_TIME_GET_DIGITS(pbEncoded, len, digits,
sysTime.wMilliseconds);
}
ret = CRYPT_AsnDecodeTimeZone(pbEncoded, len, &sysTime);
}
if (ret)
{
if (!CRYPT_DecodeEnsureSpace(dwFlags, pDecodePara, pvStructInfo,
pcbStructInfo, sizeof(FILETIME)))
ret = FALSE;
else
{
if (dwFlags & CRYPT_DECODE_ALLOC_FLAG)
pvStructInfo = *(BYTE **)pvStructInfo;
ret = SystemTimeToFileTime(&sysTime, (FILETIME *)pvStructInfo);
}
}
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;
if (!pbEncoded || !cbEncoded)
{
SetLastError(CRYPT_E_ASN1_EOD);
return FALSE;
}
if (!pvStructInfo)
{
*pcbStructInfo = sizeof(FILETIME);
return TRUE;
}
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;
}
return ret;
}
typedef BOOL (WINAPI *CryptDecodeObjectExFunc)(DWORD, LPCSTR, const BYTE *,
DWORD, DWORD, PCRYPT_DECODE_PARA, void *, DWORD *);
BOOL WINAPI CryptDecodeObjectEx(DWORD dwCertEncodingType, LPCSTR lpszStructType,
const BYTE *pbEncoded, DWORD cbEncoded, DWORD dwFlags,
PCRYPT_DECODE_PARA pDecodePara, void *pvStructInfo, DWORD *pcbStructInfo)
{
BOOL ret = FALSE;
HMODULE lib = NULL;
CryptDecodeObjectExFunc decodeFunc = NULL;
TRACE("(0x%08lx, %s, %p, %ld, 0x%08lx, %p, %p, %p)\n",
dwCertEncodingType, HIWORD(lpszStructType) ? debugstr_a(lpszStructType) :
"(integer value)", 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;
}
SetLastError(NOERROR);
if (!HIWORD(lpszStructType))
{
switch (LOWORD(lpszStructType))
{
case (WORD)X509_NAME:
decodeFunc = CRYPT_AsnDecodeName;
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)PKCS_UTC_TIME:
decodeFunc = CRYPT_AsnDecodeUtcTime;
break;
default:
FIXME("%d: unimplemented\n", LOWORD(lpszStructType));
}
}
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
TRACE("OID %s not found or unimplemented, looking for DLL\n",
debugstr_a(lpszStructType));
if (!decodeFunc)
decodeFunc = (CryptDecodeObjectExFunc)CRYPT_GetFunc(dwCertEncodingType,
lpszStructType, "CryptDecodeObjectEx", &lib);
if (decodeFunc)
ret = decodeFunc(dwCertEncodingType, lpszStructType, pbEncoded,
cbEncoded, dwFlags, pDecodePara, pvStructInfo, pcbStructInfo);
else
SetLastError(ERROR_FILE_NOT_FOUND);
if (lib)
FreeLibrary(lib);
return ret;
}
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