PROSAGA码农传奇-Windows-如何从Windows系统certstore中的证书获取公钥

<div class =“post-text”itemprop =“text”>
  <P>
    所以我找到了下面的解决方案。所有非必要的理解代码都省略了。
  </p>
  <P>
    迭代商店中的证书并通过其属性查找我的证书，然后使用
     <code>
      CryptDecodeObjectEx()
    </code>
     将键转换为的函数
     <code>
      RSA_CSP_PUBLICKEYBLOB
    </code>
     格式。
  </p>
  <P>
    钥匙保留在这个位置
     <code>
      pCertContext->pCertInfo->SubjectPublicKeyInfo.PublicKey.pbData
    </code>
     它的大小在
     <code>
      pCertContext->pCertInfo->SubjectPublicKeyInfo.PublicKey.cbData
    </code>
    。
  </p>
   <pre>
    <code>
      HCERTSTORE hCertStore = NULL;
PCCERT_CONTEXT pCertContext = NULL;
PBYTE pbPKEY = NULL;
DWORD iPKEYSize;

hCertStore = CertOpenSystemStore(NULL, L"MY");

while(pCertContext = CertEnumCertificatesInStore(
    hCertStore,
    pCertContext))
{
    DWORD dwPropId = 0;
    while(dwPropId = CertEnumCertificateContextProperties(
        pCertContext, // The context whose properties are to be listed.
        dwPropId))    // Number of the last property found.  
    {
        // ...
        // here I compare the properties to see if it is the certificate that I want.
        // ...
        CryptDecodeObjectEx((PKCS_7_ASN_ENCODING | X509_ASN_ENCODING), 
            RSA_CSP_PUBLICKEYBLOB, 
            pCertContext->pCertInfo->SubjectPublicKeyInfo.PublicKey.pbData, 
            pCertContext->pCertInfo->SubjectPublicKeyInfo.PublicKey.cbData, 
            CRYPT_ENCODE_ALLOC_FLAG, 
            NULL, 
            &pbPKEY, 
            &iPKEYSize);

// pbData and pcbDataLen are output parameters of the function
            *pcbDataLen = iPKEYSize;
            memcpy(pbData, pbPKEY, *pcbDataLen);
            LocalFree((HANDLE)pbPKEY);
        }
    }
}

</code>
  </pre>
</DIV>