使用BouncyCastle签名X509证书-无效的数字签名

问题描述

我按照以下示例操作：

但是生成的已签名客户端证书具有在Windows中打开时出现以下错误：

But the resulting signed client certificate has the following error when opened in windows:

此文件无法用作以下文件：安全证书

"This file is invalid for use as the following: Security Certificate"

如果我仍然安装它并使用certmgr查看，则证书路径看起来不错-我看到我的自签名证书颁发机构（whic h很好，没有问题），但是客户端证书具有以下状态：

If I install it anyway and view it with certmgr, the certification path looks OK - I see my self-signed Certificate Authority (which is fine, no problems there) but the client cert has the following status:

此证书的数字签名无效。

"This certificate has an invalid digital signature."

如果我调用X509Certificate.Verify（），则会引发以下异常：

If I call X509Certificate.Verify() it throws the following exception:

公开密钥不用于证书签名

"Public key presented not for certificate signature"

但是我使用的是从Pkcs10CertificationRequest中提取的完全相同的公钥，当我调用Verify（）就可以了。

Yet I'm using the same exact public key extracted from the Pkcs10CertificationRequest and when I called Verify() on that it's fine.

有什么想法吗？经过几天的努力，除了最后一个，我已经完成了所有工作-真正令人困惑的是，我自己签名的CA证书还不错。客户端证书只是发生了一些事情。这是整个代码块：

Any ideas? After days of struggling through this, I've got all the pieces working except this last one - and what's really confusing is that my self-signed CA cert is fine. There's just something going on with the client cert. Here's the entire block of code:

        TextReader textReader = new StreamReader("certificaterequest.pkcs10");
        PemReader pemReader = new PemReader(textReader);

        Pkcs10CertificationRequest certificationRequest = (Pkcs10CertificationRequest)pemReader.ReadObject();
        CertificationRequestInfo certificationRequestInfo = certificationRequest.GetCertificationRequestInfo();
        SubjectPublicKeyInfo publicKeyInfo = certificationRequestInfo.SubjectPublicKeyInfo;

        RsaPublicKeyStructure publicKeyStructure = RsaPublicKeyStructure.GetInstance(publicKeyInfo.GetPublicKey());

        RsaKeyParameters publicKey = new RsaKeyParameters(false, publicKeyStructure.Modulus, publicKeyStructure.PublicExponent);

        bool certIsOK = certificationRequest.Verify(publicKey);
        // public key is OK here...

        // get the server certificate
        Org.BouncyCastle.X509.X509Certificate serverCertificate = DotNetUtilities.FromX509Certificate(System.Security.Cryptography.X509Certificates.X509Certificate.CreateFromCertFile("servermastercertificate.cer"));

        // get the server private key
        byte[] privateKeyBytes = File.ReadAllBytes("serverprivate.key");
        AsymmetricKeyParameter serverPrivateKey = PrivateKeyFactory.CreateKey(privateKeyBytes);

        // generate the client certificate
        X509V3CertificateGenerator generator = new X509V3CertificateGenerator();

        generator.SetSerialNumber(BigInteger.ProbablePrime(120, new Random()));
        generator.SetIssuerDN(serverCertificate.SubjectDN);
        generator.SetNotBefore(DateTime.Now);
        generator.SetNotAfter(DateTime.Now.AddYears(5));
        generator.SetSubjectDN(certificationRequestInfo.Subject);
        generator.SetPublicKey(publicKey);
        generator.SetSignatureAlgorithm("SHA512withRSA");
        generator.AddExtension(X509Extensions.AuthorityKeyIdentifier, false, new AuthorityKeyIdentifierStructure(serverCertificate));
        generator.AddExtension(X509Extensions.SubjectKeyIdentifier, false, new SubjectKeyIdentifierStructure(publicKey));

        var newClientCert = generator.Generate(serverPrivateKey);

        newClientCert.Verify(publicKey); // <-- this blows up

        return DotNetUtilities.ToX509Certificate(newClientCert).Export(X509ContentType.Pkcs12, "user password");

推荐答案

我知道了。如果调用 X509Certificate.Verify（publicKey），则必须从 Pkcs10CertificationRequest 。

I figured this out. If you call X509Certificate.Verify(publicKey) you have to pass the CA's public key, not the client's public key from the Pkcs10CertificationRequest.

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