原文在 http://bbs.pediy.com/archive/index.php?t-97663.html,但是觉得这篇文章非常好,我抄下来作我笔记用
一、解析X509证书
1.从磁盘上的证书文件中读取证书数据
unsigned char* pbX509Data; // 证书数据
unsigned long ulX509DataLen; // 证书数据长度
2.获取CertContext
PCCERT_CONTEXT pCertContext = CertCreateCertificateContext(X509_ASN_ENCODING, pbX509Data, ulX509DataLen);
3.获取证书信息
pCertContext->pCertInfo->dwVersion; // 证书版本号
CRYPT_INTEGER_BLOB snBlob = pCertContext->pCertInfo->SerialNumber; // 证书SN
CERT_NAME_BLOB issuerBlob = pCertContext->pCertInfo->Issuer; // 证书颁发者
CERT_NAME_BLOB subjectBlob = pCertContext->pCertInfo->Subject; // 证书主题
// 证书有效起始日期
SYSTEMTIME sysTime;
memset(&sysTime, 0, sizeof(sysTime));
FileTimeToSystemTime(&pCertContext->pCertInfo->NotBefore, &sysTime);
char szTime[128] = {0};
sprintf_s(szTime, 128, "%d年%d月%d日 %d:%d:%d", sysTime.wYear,
sysTime.wMonth, sysTime.wDay, sysTime.wHour, sysTime.wMinute,
sysTime.wSecond);
// 证书有效终止日期
memset(&sysTime, 0, sizeof(sysTime));
FileTimeToSystemTime(&pCertContext->pCertInfo->NotAfter, &sysTime);
memset(szTime, 0, sizeof(szTime));
sprintf_s(szTime, 128, "%d年%d月%d日 %d:%d:%d", sysTime.wYear,
sysTime.wMonth, sysTime.wDay, sysTime.wHour, sysTime.wMinute,
sysTime.wSecond);
4.创建临时密钥容器
HCRYPTPROV hTmpProv = NULL;
if (RCRYPT_FAILED(CryptAcquireContext(&hTmpProv,
"My_Temporary_Container", NULL, PROV_RSA_AES, CRYPT_NEWKEYSET))) //
NULL表示使用系统默认CSP
{
if (RCRYPT_FAILED(CryptAcquireContext(&hTmpProv,
"My_Temporary_Container", NULL, PROV_RSA_AES, 0))) // NULL表示使用系统默认CSP
{
CertFreeCertificateContext(pCertContext);
return NTE_FAIL;
}
}
5.向容器中导入公钥,获取公钥句柄
HCRYPTKEY hKey = NULL;
CERT_PUBLIC_KEY_INFO certPubKeyInfo = pCertContext->pCertInfo->SubjectPublicKeyInfo;
CryptImportPublicKeyInfo(hTmpProv, X509_ASN_ENCODING|PKCS_7_ASN_ENCODING, &certPubKeyInfo, &hKey);
6.导出公钥(最好采用二次调用方式)
unsigned char* pBuf = NULL;
unsigned long ulBufLen = 0;
CryptExportKey(hKey, 0, PUBLICKEYBLOB, 0, pBuf, &ulBufLen);
pBuf = new unsigned char[ulBufLen];
memset(pBuf, 0, ulBufLen);
CryptExportKey(hKey, 0, PUBLICKEYBLOB, 0, pBuf, &ulBufLen);
7.获取公钥信息
unsigned char* p = pBuf + sizeof(PUBLICKEYSTRUC);
(*(RSAPUBKEY*)p).bitlen; // 公钥模长(以bit为单位)
(*(RSAPUBKEY*)p).pubexp; // 公钥的e(注意字节顺序)
p += sizeof(RSAPUBKEY); // 公钥的n(注意字节顺序)
8.清理工作
delete[] pBuf;
pBuf = NULL;
CryptDestroyKey(hKey);
CryptReleaseContext(hTmpProv, 0);
CertFreeCertificateContext(pCertContext);
二、解析P12证书
1.从磁盘上的证书文件中读取证书数据
unsigned char* pbP12Data; // 证书数据
unsigned long ulP12DataLen; // 证书数据长度
2.让用户输入证书密码
char* szPwd; // 证书密码
3.将证书密码转换成UNICODE格式(最好采用二次调用方式)
LPWSTR pWideChar = NULL;
int nWideChar = 0;
nWideChar = MultiByteToWideChar(CP_ACP, 0, szPwd, -1, pWideChar, nWideChar);
pWideChar = new WCHAR[nWideChar];
memset(pWideChar, 0, sizeof(WCHAR)*nWideChar);
MultiByteToWideChar(CP_ACP, 0, szPwd, -1, pWideChar, nWideChar);
4.将证书数据导入临时store
CRYPT_DATA_BLOB blob;
memset(&blob, 0, sizeof(blob));
blob.pbData = pbP12Data;
blob.cbData = ulP12DataLen;
HCERTSTORE hCertStore = NULL;
hCertStore = PFXImportCertStore(&blob, pWideChar, CRYPT_EXPORTABLE);
5.在store中查找证书,获取CertContext
PCCERT_CONTEXT pCertContext = CertFindCertificateInStore(hCertStore,
X509_ASN_ENCODING|PKCS_7_ASN_ENCODING, 0, CERT_FIND_ANY, NULL, NULL);
6.获取证书信息
CRYPT_INTEGER_BLOB snBlob = pCertContext->pCertInfo->SerialNumber; // 证书SN
pCertContext->pbCertEncoded; // X509格式证书数据
pCertContext->cbCertEncoded; // X509格式证书数据长度
7.获取CSP句柄
HCRYPTPROV hProv = NULL;
DWORD dwKeySpec = 0;
BOOL bCallerFreeProv = FALSE;
CryptAcquireCertificatePrivateKey(pCertContext, 0, NULL, &hProv, &dwKeySpec, &bCallerFreeProv);
8.获取密钥句柄
HCRYPTKEY hKey = NULL;
CryptGetUserKey(hProv, dwKeySpec, &hKey);
9.导出私钥(最好采用二次调用方式)
BYTE* pbData = NULL;
DWORD dwDataLen = 0;
CryptExportKey(hKey, NULL, PRIVATEKEYBLOB, 0, pbData, &dwDataLen);
pbData = new BYTE[dwDataLen];
memset(pbData, 0, dwDataLen);
CryptExportKey(hKey, NULL, PRIVATEKEYBLOB, 0, pbData, &dwDataLen);
10.获取公私钥信息
BYTE *p = pbData+ sizeof(PUBLICKEYSTRUC);
(*(RSAPUBKEY*)p).bitlen; // 公私钥模长(以bit为单位)
(*(RSAPUBKEY*)p).pubexp; // 公钥的e(注意字节顺序)
p += sizeof(RSAPUBKEY); // 公私钥的n(注意字节顺序)
p += ((*(RSAPUBKEY*)p).bitlen)/8; // 私钥的p(注意字节顺序)
p += ((*(RSAPUBKEY*)p).bitlen)/16; // 私钥的q(注意字节顺序)
p += ((*(RSAPUBKEY*)p).bitlen)/16; // 私钥的dp(注意字节顺序)
p += ((*(RSAPUBKEY*)p).bitlen)/16; // 私钥的dq(注意字节顺序)
p += ((*(RSAPUBKEY*)p).bitlen)/16; // 私钥的qu(注意字节顺序)
p += ((*(RSAPUBKEY*)p).bitlen)/16; // 私钥的d(注意字节顺序)
11.清理工作
delete[] pbData;
pbData = NULL;
CryptDestroyKey(hKey);
CryptReleaseContext(hProv, 0);
CertFreeCertificateContext(pCertContext);
CertCloseStore(hCertStore, CERT_CLOSE_STORE_FORCE_FLAG);
delete[] pWideChar;
pWideChar = NULL;
注:为了缩短篇幅,上述代码没有包含错误和异常处理。