CertGetSubjectCertificateFromStore 函式 (wincrypt.h)
CertGetSubjectCertificateFromStore 函式會從證書存儲傳回主體憑證內容,由其簽發者和序號唯一識別。
語法
PCCERT_CONTEXT CertGetSubjectCertificateFromStore(
[in] HCERTSTORE hCertStore,
[in] DWORD dwCertEncodingType,
[in] PCERT_INFO pCertId
);
參數
[in] hCertStore
證書存儲的句柄。
[in] dwCertEncodingType
使用的編碼類型。 將憑證和 訊息編碼類型 與位 OR 作業結合在一起,一律可以接受,如下列範例所示:
X509_ASN_ENCODING |PKCS_7_ASN_ENCODING目前定義的編碼類型如下:
- X509_ASN_ENCODING
- PKCS_7_ASN_ENCODING
[in] pCertId
CERT_INFO 結構的指標。 只會使用 Issuer 和 SerialNumber 成員。
傳回值
如果函式成功,函式會傳回只讀 CERT_CONTEXT的指標。 CERT_CONTEXT必須藉由呼叫 CertFreeCertificateContext 來釋放。
傳回的憑證可能無效。 通常,在 CertGetIssuerCertificateFromStore () 取得其簽發者憑證時,會加以驗證。
如需擴充的錯誤資訊,請呼叫 GetLastError。 其中一個可能的錯誤碼如下。
傳回碼 | Description |
---|---|
|
在存放區中找不到主體憑證。 |
備註
您可以呼叫 CertDuplicateCertificateContext 來建立重複的憑證。
範例
下列範例顯示從證書存儲擷取主體的憑證內容,由其簽發者和序號唯一識別。 如需包含此範例完整內容的範例,請參閱 範例 C 程式:簽署、編碼、譯碼和驗證訊息。
#include <windows.h>
#include <stdio.h>
#include <Wincrypt.h>
#define MY_ENCODING_TYPE (PKCS_7_ASN_ENCODING | X509_ASN_ENCODING)
void main()
{
//-------------------------------------------------------------------
// Declare and initialize variables.
HCERTSTORE hStoreHandle; // certificate store handle
HCRYPTMSG hMsg;
PCCERT_CONTEXT pSignerCertContext;
DWORD cbSignerCertInfo;
PCERT_INFO pSignerCertInfo;
//-------------------------------------------------------------------
// This code is based on hMsg being a signed, encoded message
// read from a file or otherwise acquired. For detailed code, see
// "Example C Program: Signing, Encoding, Decoding, and Verifying a
// Message."
//-------------------------------------------------------------------
// Retrieve the signer CERT_INFO from the message by first getting
// the size of the memory required for the certificate.
if(CryptMsgGetParam(
hMsg, // handle to the message
CMSG_SIGNER_CERT_INFO_PARAM, // parameter type
0, // index
NULL,
&cbSignerCertInfo)) // size of the returned information
{
printf("%d bytes needed for the buffer.\n", cbSignerCertInfo);
}
else
{
printf("Verify SIGNER_CERT_INFO #1 failed\n");
exit(1);
}
//-------------------------------------------------------------------
// Allocate memory.
pSignerCertInfo = (PCERT_INFO) malloc(cbSignerCertInfo);
if (!pSignerCertInfo)
{
printf("Verify memory allocation failed.\n");
exit(1);
}
//-------------------------------------------------------------------
// Get the message certificate information (CERT_INFO
// structure).
if(!(CryptMsgGetParam(
hMsg, // handle to the message
CMSG_SIGNER_CERT_INFO_PARAM, // parameter type
0, // index
pSignerCertInfo, // address for returned information
&cbSignerCertInfo))) // size of the returned information
{
printf("Verify SIGNER_CERT_INFO #2 failed.\n");
exit(1);
}
//-------------------------------------------------------------------
// Open a certificate store in memory using CERT_STORE_PROV_MSG,
// which initializes it with the certificates from the message.
hStoreHandle = CertOpenStore(
CERT_STORE_PROV_MSG, // store provider type
MY_ENCODING_TYPE, // encoding type
NULL, // cryptographic provider
// use NULL for the default
0, // flags
hMsg)); // handle to the message
if (hStoreHandle)
{
printf("The certificate store to be used for message\n ");
printf(" verification has been opened. \n");
}
else
{
printf("Verify open store failed.\n");
exit(1);
}
//-------------------------------------------------------------------
// Find the signer's certificate in the store.
pSignerCertContext = CertGetSubjectCertificateFromStore(
hStoreHandle, // handle to store
MY_ENCODING_TYPE, // encoding type
pSignerCertInfo)); // pointer to retrieved CERT_CONTEXT
if(pSignerCertContext)
{
//-------------------------------------------------------------------
// Use the certificate retrieved from the message. For some
// processing that can be done with the certificate, see the full
// program.
}
//-------------------------------------------------------------------
// Clean up.
if(pSignerCertInfo)
free(pSignerCertInfo);
if(pSignerCertContext)
CertFreeCertificateContext(pSignerCertContext);
if(hStoreHandle)
CertCloseStore(hStoreHandle, CERT_CLOSE_STORE_FORCE_FLAG);
if(hMsg)
CryptMsgClose(hMsg);
}
規格需求
需求 | 值 |
---|---|
最低支援的用戶端 | Windows XP [傳統型應用程式 |UWP 應用程式] |
最低支援的伺服器 | Windows Server 2003 [傳統型應用程式 |UWP 應用程式] |
目標平台 | Windows |
標頭 | wincrypt.h |
程式庫 | Crypt32.lib |
Dll | Crypt32.dll |
另請參閱
CertDuplicateCertificateContext