获取windows下执行文件签名和证书信息
获取证书信息
验证文件数字签名是否有效可以使用函数 WinVerifyTrust，
可以用：
取得文件数字签名证书信息需要使用函数 CryptQueryObject，再用CertFindCertificateInStore获取证书Cert
也可以通过，WTHelperProvDataFromStateData WTHelperGetProvSignerFromChain WTHelperGetProvCertFromChain获取证书Cert
这里算法是：
typedef struct _CERT_INFO {
DWORD dwVersion;
CRYPT_INTEGER_BLOB SerialNumber;
CRYPT_ALGORITHM_IDENTIFIER SignatureAlgorithm;
CERT_NAME_BLOB Issuer;
FILETIME NotBefore;
FILETIME NotAfter;
CERT_NAME_BLOB Subject;
CERT_PUBLIC_KEY_INFO SubjectPublicKeyInfo;
CRYPT_BIT_BLOB IssuerUniqueId;
CRYPT_BIT_BLOB SubjectUniqueId;
DWORD cExtension;
PCERT_EXTENSION rgExtension;
} CERT_INFO, *PCERT_INFO;CERT_INFO结构体中SignatureAlgorithm字段 同时这个字段也是一个结构体
typedef struct _CRYPT_ALGORITHM_IDENTIFIER {
LPSTR pszObjId;
CRYPT_OBJID_BLOB Parameters;
} CRYPT_ALGORITHM_IDENTIFIER, *PCRYPT_ALGORITHM_IDENTIFIER;
CRYPT_ALGORITHM_IDENTIFIER第一个字段就是对应算法，但是值是一个字符串 要通过宏查看 得自己转换
宏有：
#define szOID_RSA "1.2.840.113549"
#define szOID_PKCS "1.2.840.113549.1"
#define szOID_RSA_HASH "1.2.840.113549.2"
#define szOID_RSA_ENCRYPT "1.2.840.113549.3"
#define szOID_PKCS_1 "1.2.840.113549.1.1"
#define szOID_PKCS_2 "1.2.840.113549.1.2"
#define szOID_PKCS_3 "1.2.840.113549.1.3"
#define szOID_PKCS_4 "1.2.840.113549.1.4"
#define szOID_PKCS_5 "1.2.840.113549.1.5"
#define szOID_PKCS_6 "1.2.840.113549.1.6"
#define szOID_PKCS_7 "1.2.840.113549.1.7"
#define szOID_PKCS_8 "1.2.840.113549.1.8"
#define szOID_PKCS_9 "1.2.840.113549.1.9"
#define szOID_PKCS_10 "1.2.840.113549.1.10"
#define szOID_PKCS_12 "1.2.840.113549.1.12"
#define szOID_RSA_RSA "1.2.840.113549.1.1.1"
#define szOID_RSA_MD2RSA "1.2.840.113549.1.1.2"
#define szOID_RSA_MD4RSA "1.2.840.113549.1.1.3"
#define szOID_RSA_MD5RSA "1.2.840.113549.1.1.4"
#define szOID_RSA_SHA1RSA "1.2.840.113549.1.1.5"
#define szOID_RSA_SETOAEP_RSA "1.2.840.113549.1.1.6"
#define szOID_RSAES_OAEP "1.2.840.113549.1.1.7"
#define szOID_RSA_MGF1 "1.2.840.113549.1.1.8"
#define szOID_RSA_PSPECIFIED "1.2.840.113549.1.1.9"
#define szOID_RSA_SSA_PSS "1.2.840.113549.1.1.10"
#define szOID_RSA_SHA256RSA "1.2.840.113549.1.1.11"
#define szOID_RSA_SHA384RSA "1.2.840.113549.1.1.12"
#define szOID_RSA_SHA512RSA "1.2.840.113549.1.1.13"
#define szOID_RSA_DH "1.2.840.113549.1.3.1"
#define szOID_RSA_data "1.2.840.113549.1.7.1"
#define szOID_RSA_signedData "1.2.840.113549.1.7.2"
#define szOID_RSA_envelopedData "1.2.840.113549.1.7.3"
#define szOID_RSA_signEnvData "1.2.840.113549.1.7.4"
#define szOID_RSA_digestedData "1.2.840.113549.1.7.5"
#define szOID_RSA_hashedData "1.2.840.113549.1.7.5"
#define szOID_RSA_encryptedData "1.2.840.113549.1.7.6"
#define szOID_RSA_emailAddr "1.2.840.113549.1.9.1"
#define szOID_RSA_unstructName "1.2.840.113549.1.9.2"
#define szOID_RSA_contentType "1.2.840.113549.1.9.3"
#define szOID_RSA_messageDigest "1.2.840.113549.1.9.4"
#define szOID_RSA_signingTime "1.2.840.113549.1.9.5"
#define szOID_RSA_counterSign "1.2.840.113549.1.9.6"
#define szOID_RSA_challengePwd "1.2.840.113549.1.9.7"
#define szOID_RSA_unstructAddr "1.2.840.113549.1.9.8"
#define szOID_RSA_extCertAttrs "1.2.840.113549.1.9.9"
#define szOID_RSA_certExtensions "1.2.840.113549.1.9.14"
#define szOID_RSA_SMIMECapabilities "1.2.840.113549.1.9.15"
#define szOID_RSA_preferSignedData "1.2.840.113549.1.9.15.1"
#define szOID_TIMESTAMP_TOKEN "1.2.840.113549.1.9.16.1.4"
#define szOID_RFC3161_counterSign "1.3.6.1.4.1.311.3.3.1"
#define szOID_RSA_SMIMEalg "1.2.840.113549.1.9.16.3"
#define szOID_RSA_SMIMEalgESDH "1.2.840.113549.1.9.16.3.5"
#define szOID_RSA_SMIMEalgCMS3DESwrap "1.2.840.113549.1.9.16.3.6"
#define szOID_RSA_SMIMEalgCMSRC2wrap "1.2.840.113549.1.9.16.3.7"
#define szOID_RSA_MD2 "1.2.840.113549.2.2"
#define szOID_RSA_MD4 "1.2.840.113549.2.4"
#define szOID_RSA_MD5 "1.2.840.113549.2.5"
#define szOID_RSA_RC2CBC "1.2.840.113549.3.2"
#define szOID_RSA_RC4 "1.2.840.113549.3.4"
#define szOID_RSA_DES_EDE3_CBC "1.2.840.113549.3.7"
#define szOID_RSA_RC5_CBCPad "1.2.840.113549.3.9"
#define szOID_ANSI_X942 "1.2.840.10046"
#define szOID_ANSI_X942_DH "1.2.840.10046.2.1"
#define szOID_X957 "1.2.840.10040"
#define szOID_X957_DSA "1.2.840.10040.4.1"
#define szOID_X957_SHA1DSA "1.2.840.10040.4.3"
// iso(1) member-body(2) us(840) 10045 keyType(2) unrestricted(1)
#define szOID_ECC_PUBLIC_KEY "1.2.840.10045.2.1"
// iso(1) member-body(2) us(840) 10045 curves(3) prime(1) 7
#define szOID_ECC_CURVE_P256 "1.2.840.10045.3.1.7"
// iso(1) identified-organization(3) certicom(132) curve(0) 34
#define szOID_ECC_CURVE_P384 "1.3.132.0.34"
// iso(1) identified-organization(3) certicom(132) curve(0) 35
#define szOID_ECC_CURVE_P521 "1.3.132.0.35"
// iso(1) member-body(2) us(840) 10045 signatures(4) sha1(1)
#define szOID_ECDSA_SHA1 "1.2.840.10045.4.1"
// iso(1) member-body(2) us(840) 10045 signatures(4) specified(3)
#define szOID_ECDSA_SPECIFIED "1.2.840.10045.4.3"
// iso(1) member-body(2) us(840) 10045 signatures(4) specified(3) 2
#define szOID_ECDSA_SHA256 "1.2.840.10045.4.3.2"
// iso(1) member-body(2) us(840) 10045 signatures(4) specified(3) 3
#define szOID_ECDSA_SHA384 "1.2.840.10045.4.3.3"
// iso(1) member-body(2) us(840) 10045 signatures(4) specified(3) 4
#define szOID_ECDSA_SHA512 "1.2.840.10045.4.3.4"
// NIST AES CBC Algorithms
// joint-iso-itu-t(2) country(16) us(840) organization(1) gov(101) csor(3) nistAlgorithms(4) aesAlgs(1) }
#define szOID_NIST_AES128_CBC "2.16.840.1.101.3.4.1.2"
#define szOID_NIST_AES192_CBC "2.16.840.1.101.3.4.1.22"
#define szOID_NIST_AES256_CBC "2.16.840.1.101.3.4.1.42"
// For the above Algorithms, the AlgorithmIdentifier parameters must be
// present and the parameters field MUST contain an AES-IV:
//
// AES-IV ::= OCTET STRING (SIZE(16))
// NIST AES WRAP Algorithms
#define szOID_NIST_AES128_WRAP "2.16.840.1.101.3.4.1.5"
#define szOID_NIST_AES192_WRAP "2.16.840.1.101.3.4.1.25"
#define szOID_NIST_AES256_WRAP "2.16.840.1.101.3.4.1.45"
代码1
#include <windows.h>
#include <wincrypt.h>
#include <wintrust.h>
#include <stdio.h>
#include <tchar.h>
#pragma comment(lib, "crypt32.lib")
#define ENCODING (X509_ASN_ENCODING | PKCS_7_ASN_ENCODING)
typedef struct {
LPWSTR lpszProgramName;
LPWSTR lpszPublisherLink;
LPWSTR lpszMoreInfoLink;
} SPROG_PUBLISHERINFO, *PSPROG_PUBLISHERINFO;
BOOL GetProgAndPublisherInfo(PCMSG_SIGNER_INFO pSignerInfo,
PSPROG_PUBLISHERINFO Info);
BOOL GetDateOfTimeStamp(PCMSG_SIGNER_INFO pSignerInfo, SYSTEMTIME *st);
BOOL PrintCertificateInfo(PCCERT_CONTEXT pCertContext);
BOOL GetTimeStampSignerInfo(PCMSG_SIGNER_INFO pSignerInfo,
PCMSG_SIGNER_INFO *pCounterSignerInfo);
wchar_t * char2wchar(const char* cchar)
{
wchar_t *m_wchar;
int len = MultiByteToWideChar(CP_ACP, 0, cchar, strlen(cchar), NULL, 0);
m_wchar = new wchar_t[len + 1];
MultiByteToWideChar(CP_ACP, 0, cchar, strlen(cchar), m_wchar, len);
m_wchar[len] = ‘\0‘;
return m_wchar;
}
int main(int argc, TCHAR *argv[])
{
WCHAR szFileName[MAX_PATH];
HCERTSTORE hStore = NULL;
HCRYPTMSG hMsg = NULL;
PCCERT_CONTEXT pCertContext = NULL;
BOOL fResult;
DWORD dwEncoding, dwContentType, dwFormatType;
PCMSG_SIGNER_INFO pSignerInfo = NULL;
PCMSG_SIGNER_INFO pCounterSignerInfo = NULL;
DWORD dwSignerInfo;
CERT_INFO CertInfo;
SPROG_PUBLISHERINFO ProgPubInfo;
SYSTEMTIME st;
ZeroMemory(&ProgPubInfo, sizeof(ProgPubInfo));
__try
{
//if (argc != 2)
//{
// _tprintf(_T("Usage: SignedFileInfo <filename>\n"));
// return 0;
//}
#ifdef UNICODE
lstrcpynW(szFileName, argv[1], MAX_PATH);
#else
//if (mbstowcs(szFileName, argv[1], MAX_PATH) == -1)
//{
// printf("Unable to convert to unicode.\n");
// __leave;
//}
#endif
// Get message handle and store handle from the signed file.
fResult = CryptQueryObject(CERT_QUERY_OBJECT_FILE,
char2wchar("D:\\Users\\lhl.liu\\Documents\\shunwang\\SWtool1\\test\\WeChat.exe"),
CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED_EMBED,
CERT_QUERY_FORMAT_FLAG_BINARY,
0,
&dwEncoding,
&dwContentType,
&dwFormatType,
&hStore,
&hMsg,
NULL);
if (!fResult)
{
_tprintf(_T("CryptQueryObject failed with %x\n"), GetLastError());
__leave;
}
// Get signer information size.
fResult = CryptMsgGetParam(hMsg,
CMSG_SIGNER_INFO_PARAM,
0,
NULL,
&dwSignerInfo);
if (!fResult)
{
_tprintf(_T("CryptMsgGetParam failed with %x\n"), GetLastError());
__leave;
}
// Allocate memory for signer information.
pSignerInfo = (PCMSG_SIGNER_INFO)LocalAlloc(LPTR, dwSignerInfo);
if (!pSignerInfo)
{
_tprintf(_T("Unable to allocate memory for Signer Info.\n"));
__leave;
}
// Get Signer Information.
fResult = CryptMsgGetParam(hMsg,
CMSG_SIGNER_INFO_PARAM,
0,
(PVOID)pSignerInfo,
&dwSignerInfo);
if (!fResult)
{
_tprintf(_T("CryptMsgGetParam failed with %x\n"), GetLastError());
__leave;
}
// Get program name and publisher information from
// signer info structure.
if (GetProgAndPublisherInfo(pSignerInfo, &ProgPubInfo))
{
if (ProgPubInfo.lpszProgramName != NULL)
{
wprintf(L"Program Name : %s\n",
ProgPubInfo.lpszProgramName);
}
if (ProgPubInfo.lpszPublisherLink != NULL)
{
wprintf(L"Publisher Link : %s\n",
ProgPubInfo.lpszPublisherLink);
}
if (ProgPubInfo.lpszMoreInfoLink != NULL)
{
wprintf(L"MoreInfo Link : %s\n",
ProgPubInfo.lpszMoreInfoLink);
}
}
_tprintf(_T("\n"));
// Search for the signer certificate in the temporary
// certificate store.
CertInfo.Issuer = pSignerInfo->Issuer;
CertInfo.SerialNumber = pSignerInfo->SerialNumber;
pCertContext = CertFindCertificateInStore(hStore,
ENCODING,
0,
CERT_FIND_SUBJECT_CERT,
(PVOID)&CertInfo,
NULL);
if (!pCertContext)
{
_tprintf(_T("CertFindCertificateInStore failed with %x\n"),
GetLastError());
__leave;
}
// Print Signer certificate information.
_tprintf(_T("Signer Certificate:"));
PrintCertificateInfo(pCertContext);
_tprintf(_T("\n"));
// Get the timestamp certificate signerinfo structure.
if (GetTimeStampSignerInfo(pSignerInfo, &pCounterSignerInfo))
{
// Search for Timestamp certificate in the temporary
// certificate store.
CertInfo.Issuer = pCounterSignerInfo->Issuer;
CertInfo.SerialNumber = pCounterSignerInfo->SerialNumber;
pCertContext = CertFindCertificateInStore(hStore,
ENCODING,
0,
CERT_FIND_SUBJECT_CERT,
(PVOID)&CertInfo,
NULL);
if (!pCertContext)
{
_tprintf(_T("CertFindCertificateInStore failed with %x\n"),
GetLastError());
__leave;
}
// Print timestamp certificate information.
_tprintf(_T("TimeStamp Certificate:
"));
PrintCertificateInfo(pCertContext);
_tprintf(_T("\n"));
// Find Date of timestamp.
if (GetDateOfTimeStamp(pCounterSignerInfo, &st))
{
_tprintf(_T("Date of TimeStamp : %02d/%02d/%04d %02d:%02d\n"),
st.wMonth,
st.wDay,
st.wYear,
st.wHour,
st.wMinute);
}
_tprintf(_T("\n"));
}
}
__finally
{
// Clean up.
if (ProgPubInfo.lpszProgramName != NULL)
LocalFree(ProgPubInfo.lpszProgramName);
if (ProgPubInfo.lpszPublisherLink != NULL)
LocalFree(ProgPubInfo.lpszPublisherLink);
if (ProgPubInfo.lpszMoreInfoLink != NULL)
LocalFree(ProgPubInfo.lpszMoreInfoLink);
if (pSignerInfo != NULL) LocalFree(pSignerInfo);
if (pCounterSignerInfo != NULL) LocalFree(pCounterSignerInfo);
if (pCertContext != NULL) CertFreeCertificateContext(pCertContext);
if (hStore != NULL) CertCloseStore(hStore, 0);
if (hMsg != NULL) CryptMsgClose(hMsg);
}
getchar();
return 0;
}
BOOL PrintCertificateInfo(PCCERT_CONTEXT pCertContext)
{
BOOL fReturn = FALSE;
LPTSTR szName = NULL;
DWORD dwData;
__try
{
// Print Serial Number.
_tprintf(_T("Serial Number: "));
dwData = pCertContext->pCertInfo->SerialNumber.cbData;
for (DWORD n = 0; n < dwData; n++)
{
_tprintf(_T("%02x "),
pCertContext->pCertInfo->SerialNumber.pbData[dwData - (n + 1)]);
}
_tprintf(_T("\n"));
// Get Issuer name size.
if (!(dwData = CertGetNameString(pCertContext,
CERT_NAME_SIMPLE_DISPLAY_TYPE,
CERT_NAME_ISSUER_FLAG,
NULL,
NULL,
0)))
{
_tprintf(_T("CertGetNameString failed.\n"));
__leave;
}
// Allocate memory for Issuer name.
szName = (LPTSTR)LocalAlloc(LPTR, dwData * sizeof(TCHAR));
if (!szName)
{
_tprintf(_T("Unable to allocate memory for issuer name.\n"));
__leave;
}
// Get Issuer name.
if (!(CertGetNameString(pCertContext,
CERT_NAME_SIMPLE_DISPLAY_TYPE,
CERT_NAME_ISSUER_FLAG,
NULL,
szName,
dwData)))
{
_tprintf(_T("CertGetNameString failed.\n"));
__leave;
}
// print Issuer name.
_tprintf(_T("Issuer Name: %s\n"), szName);
LocalFree(szName);
szName = NULL;
// Get Subject name size.
if (!(dwData = CertGetNameString(pCertContext,
CERT_NAME_SIMPLE_DISPLAY_TYPE,
0,
NULL,
NULL,
0)))
{
_tprintf(_T("CertGetNameString failed.\n"));
__leave;
}
// Allocate memory for subject name.
szName = (LPTSTR)LocalAlloc(LPTR, dwData * sizeof(TCHAR));
if (!szName)
{
_tprintf(_T("Unable to allocate memory for subject name.\n"));
__leave;
}
// Get subject name.
if (!(CertGetNameString(pCertContext,
CERT_NAME_SIMPLE_DISPLAY_TYPE,
0,
NULL,
szName,
dwData)))
{
_tprintf(_T("CertGetNameString failed.\n"));
__leave;
}
// Print Subject Name.
_tprintf(_T("Subject Name: %s\n"), szName);
fReturn = TRUE;
}
__finally
{
if (szName != NULL) LocalFree(szName);
}
return fReturn;
}
LPWSTR AllocateAndCopyWideString(LPCWSTR inputString)
{
LPWSTR outputString = NULL;
outputString = (LPWSTR)LocalAlloc(LPTR,
(wcslen(inputString) + 1) * sizeof(WCHAR));
if (outputString != NULL)
{
lstrcpyW(outputString, inputString);
}
return outputString;
}
BOOL GetProgAndPublisherInfo(PCMSG_SIGNER_INFO pSignerInfo,
PSPROG_PUBLISHERINFO Info)
{
BOOL fReturn = FALSE;
PSPC_SP_OPUS_INFO OpusInfo = NULL;
DWORD dwData;
BOOL fResult;
__try
{
// Loop through authenticated attributes and find
// SPC_SP_OPUS_INFO_OBJID OID.
for (DWORD n = 0; n < pSignerInfo->AuthAttrs.cAttr; n++)
{
if (lstrcmpA(SPC_SP_OPUS_INFO_OBJID,
pSignerInfo->AuthAttrs.rgAttr[n].pszObjId) == 0)
{
// Get Size of SPC_SP_OPUS_INFO structure.
fResult = CryptDecodeObject(ENCODING,
SPC_SP_OPUS_INFO_OBJID,
pSignerInfo->AuthAttrs.rgAttr[n].rgValue[0].pbData,
pSignerInfo->AuthAttrs.rgAttr[n].rgValue[0].cbData,
0,
NULL,
&dwData);
if (!fResult)
{
_tprintf(_T("CryptDecodeObject failed with %x\n"),
GetLastError());
__leave;
}
// Allocate memory for SPC_SP_OPUS_INFO structure.
OpusInfo = (PSPC_SP_OPUS_INFO)LocalAlloc(LPTR, dwData);
if (!OpusInfo)
{
_tprintf(_T("Unable to allocate memory for Publisher Info.\n"));
__leave;
}
// Decode and get SPC_SP_OPUS_INFO structure.
fResult = CryptDecodeObject(ENCODING,
SPC_SP_OPUS_INFO_OBJID,
pSignerInfo->AuthAttrs.rgAttr[n].rgValue[0].pbData,
pSignerInfo->AuthAttrs.rgAttr[n].rgValue[0].cbData,
0,
OpusInfo,
&dwData);
if (!fResult)
{
_tprintf(_T("CryptDecodeObject failed with %x\n"),
GetLastError());
__leave;
}
// Fill in Program Name if present.
if (OpusInfo->pwszProgramName)
{
Info->lpszProgramName =
AllocateAndCopyWideString(OpusInfo->pwszProgramName);
}
else
Info->lpszProgramName = NULL;
// Fill in Publisher Information if present.
if (OpusInfo->pPublisherInfo)
{
switch (OpusInfo->pPublisherInfo->dwLinkChoice)
{
case SPC_URL_LINK_CHOICE:
Info->lpszPublisherLink =
AllocateAndCopyWideString(OpusInfo->pPublisherInfo->pwszUrl);
break;
case SPC_FILE_LINK_CHOICE:
Info->lpszPublisherLink =
AllocateAndCopyWideString(OpusInfo->pPublisherInfo->pwszFile);
break;
default:
Info->lpszPublisherLink = NULL;
break;
}
}
else
{
Info->lpszPublisherLink = NULL;
}
// Fill in More Info if present.
if (OpusInfo->pMoreInfo)
{
switch (OpusInfo->pMoreInfo->dwLinkChoice)
{
case SPC_URL_LINK_CHOICE:
Info->lpszMoreInfoLink =
AllocateAndCopyWideString(OpusInfo->pMoreInfo->pwszUrl);
break;
case SPC_FILE_LINK_CHOICE:
Info->lpszMoreInfoLink =
AllocateAndCopyWideString(OpusInfo->pMoreInfo->pwszFile);
break;
default:
Info->lpszMoreInfoLink = NULL;
break;
}
}
else
{
Info->lpszMoreInfoLink = NULL;
}
fReturn = TRUE;
break; // Break from for loop.
} // lstrcmp SPC_SP_OPUS_INFO_OBJID
} // for
}
__finally
{
if (OpusInfo != NULL) LocalFree(OpusInfo);
}
return fReturn;
}
BOOL GetDateOfTimeStamp(PCMSG_SIGNER_INFO pSignerInfo, SYSTEMTIME *st)
{
BOOL fResult;
FILETIME lft, ft;
DWORD dwData;
BOOL fReturn = FALSE;
// Loop through authenticated attributes and find
// szOID_RSA_signingTime OID.
for (DWORD n = 0; n < pSignerInfo->AuthAttrs.cAttr; n++)
{
if (lstrcmpA(szOID_RSA_signingTime,
pSignerInfo->AuthAttrs.rgAttr[n].pszObjId) == 0)
{
// Decode and get FILETIME structure.
dwData = sizeof(ft);
fResult = CryptDecodeObject(ENCODING,
szOID_RSA_signingTime,
pSignerInfo->AuthAttrs.rgAttr[n].rgValue[0].pbData,
pSignerInfo->AuthAttrs.rgAttr[n].rgValue[0].cbData,
0,
(PVOID)&ft,
&dwData);
if (!fResult)
{
_tprintf(_T("CryptDecodeObject failed with %x\n"),
GetLastError());
break;
}
// Convert to local time.
FileTimeToLocalFileTime(&ft, &lft);
FileTimeToSystemTime(&lft, st);
fReturn = TRUE;
break; // Break from for loop.
} //lstrcmp szOID_RSA_signingTime
} // for
return fReturn;
}
BOOL GetTimeStampSignerInfo(PCMSG_SIGNER_INFO pSignerInfo, PCMSG_SIGNER_INFO *pCounterSignerInfo)
{
PCCERT_CONTEXT pCertContext = NULL;
BOOL fReturn = FALSE;
BOOL fResult;
DWORD dwSize;
__try
{
*pCounterSignerInfo = NULL;
// Loop through unathenticated attributes for
// szOID_RSA_counterSign OID.
for (DWORD n = 0; n < pSignerInfo->UnauthAttrs.cAttr; n++)
{
if (lstrcmpA(pSignerInfo->UnauthAttrs.rgAttr[n].pszObjId,
szOID_RSA_counterSign) == 0)
{
// Get size of CMSG_SIGNER_INFO structure.
fResult = CryptDecodeObject(ENCODING,
PKCS7_SIGNER_INFO,
pSignerInfo->UnauthAttrs.rgAttr[n].rgValue[0].pbData,
pSignerInfo->UnauthAttrs.rgAttr[n].rgValue[0].cbData,
0,
NULL,
&dwSize);
if (!fResult)
{
_tprintf(_T("CryptDecodeObject failed with %x\n"),
GetLastError());
__leave;
}
// Allocate memory for CMSG_SIGNER_INFO.
*pCounterSignerInfo = (PCMSG_SIGNER_INFO)LocalAlloc(LPTR, dwSize);
if (!*pCounterSignerInfo)
{
_tprintf(_T("Unable to allocate memory for timestamp info.\n"));
__leave;
}
// Decode and get CMSG_SIGNER_INFO structure
// for timestamp certificate.
fResult = CryptDecodeObject(ENCODING,
PKCS7_SIGNER_INFO,
pSignerInfo->UnauthAttrs.rgAttr[n].rgValue[0].pbData,
pSignerInfo->UnauthAttrs.rgAttr[n].rgValue[0].cbData,
0,
(PVOID)*pCounterSignerInfo,
&dwSize);
if (!fResult)
{
_tprintf(_T("CryptDecodeObject failed with %x\n"),
GetLastError());
__leave;
}
fReturn = TRUE;
break; // Break from for loop.
}
}
}
__finally
{
// Clean up.
if (pCertContext != NULL) CertFreeCertificateContext(pCertContext);
}
return fReturn;
}
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