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我正在尝试从现有公钥以编程方式创建证书请求。但我得到一个“请求的属性值为空。（来自 HRESULT 的异常：0x80094004）”异常。这是我的代码：

    private static string CreateCertRequestMessage(string encodedPublicKeyInfo)
    {
        CObjectId objAlg = new CObjectId();
        objAlg.InitializeFromAlgorithmName(
            ObjectIdGroupId.XCN_CRYPT_PUBKEY_ALG_OID_GROUP_ID, 
            ObjectIdPublicKeyFlags.XCN_CRYPT_OID_INFO_PUBKEY_ANY, 
            AlgorithmFlags.AlgorithmFlagsNone, 
            "RSA");

        CX509PublicKey objPublicKey = new CX509PublicKey();
        objPublicKey.Initialize(objAlg, encodedPublicKeyInfo, "", EncodingType.XCN_CRYPT_STRING_HEX);
        Console.WriteLine(objPublicKey.Algorithm.FriendlyName);
        Console.WriteLine(objPublicKey.Algorithm.Value);
        Console.WriteLine(objPublicKey.Length);
        Console.WriteLine(objPublicKey.EncodedKey);

        var objPkcs10 = new CX509CertificateRequestCertificate();

        objPkcs10.InitializeFromPublicKey(
            X509CertificateEnrollmentContext.ContextUser,
            objPublicKey,
            string.Empty);


        var objExtensionKeyUsage = new CX509ExtensionKeyUsage();
        objExtensionKeyUsage.InitializeEncode(
            CERTENROLLLib.X509KeyUsageFlags.XCN_CERT_DIGITAL_SIGNATURE_KEY_USAGE |
            CERTENROLLLib.X509KeyUsageFlags.XCN_CERT_NON_REPUDIATION_KEY_USAGE |
            CERTENROLLLib.X509KeyUsageFlags.XCN_CERT_KEY_ENCIPHERMENT_KEY_USAGE |
            CERTENROLLLib.X509KeyUsageFlags.XCN_CERT_DATA_ENCIPHERMENT_KEY_USAGE);
        objPkcs10.X509Extensions.Add((CX509Extension)objExtensionKeyUsage);

        var objObjectId = new CObjectId();
        var objObjectIds = new CObjectIds();
        var objX509ExtensionEnhancedKeyUsage = new CX509ExtensionEnhancedKeyUsage();
        objObjectId.InitializeFromValue("1.3.6.1.5.5.7.3.2");
        objObjectIds.Add(objObjectId);
        objX509ExtensionEnhancedKeyUsage.InitializeEncode(objObjectIds);
        objPkcs10.X509Extensions.Add((CX509Extension)objX509ExtensionEnhancedKeyUsage);

        string templateName = "MHM Template";
        CX509ExtensionTemplateName template = new CX509ExtensionTemplateName();
        template.InitializeEncode(templateName);
        objPkcs10.X509Extensions.Add((CX509Extension)template);

        var objDN = new CX500DistinguishedName();
        var subjectName = "CN = shaunxu.me, OU = ADCS, O = Blog, L = Beijng, S = Beijing, C = CN";
        objDN.Encode(subjectName, X500NameFlags.XCN_CERT_NAME_STR_NONE);
        objPkcs10.Subject = objDN;

        CObjectId objHash = new CObjectId();
        objHash.InitializeFromAlgorithmName(
            ObjectIdGroupId.XCN_CRYPT_HASH_ALG_OID_GROUP_ID, 
            ObjectIdPublicKeyFlags.XCN_CRYPT_OID_INFO_PUBKEY_ANY, 
            AlgorithmFlags.AlgorithmFlagsNone, 
            "SHA1");
        objPkcs10.HashAlgorithm = objHash;

        var objEnroll = new CX509Enrollment();
        objEnroll.InitializeFromRequest(objPkcs10);

        var strRequest = objEnroll.CreateRequest(EncodingType.XCN_CRYPT_STRING_BASE64);
        return strRequest;
    }

我成功地从私钥创建请求。但我需要从公钥创建请求。请帮我。我到底在这里想念什么。

提前致谢

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1 回答 1

1

公钥证书的目的是确认密钥对（私钥和公钥）的所有权。这意味着，当我向另一方出示带有我姓名的证书时，证书颁发机构会确认（通过签署证书）该密钥对实际上属于我。特别是，这意味着我“拥有”私钥。（在这种情况下，所有权意味着我知道，但没有其他人知道。）

In order to confirm this, the certification authority must be sure that I am in possession of the private key. So, any certification process must, at some point, involve the private key. I will not give away the private key but at least I have to use it in a challenge/response exchange. The public key is used to verify the validity of my response and thus the certification authority knows that I am having the private key.

Look at it a different way. The public key is publicly known. What use would it be to have a certificate that confirms that I am the "owner" of the public key? Everybody knows it, you cannot "own" the public key.

于 2014-11-19T08:10:41.563 回答