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;
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