Bouncycastle在C#的证书处理

Bouncy Castle是一个流行的加密库，提供了许多加密算法和密码学功能。在C#中，你可以使用Bouncy Castle来处理证书，例如验证证书、创建证书签名请求（CSR）或生成自签名证书等。

要在C#中使用Bouncy Castle，首先需要将其添加到项目中。你可以通过NuGet包管理器安装Bouncy Castle库。在Visual Studio中，右键单击项目，选择“管理NuGet程序包”，然后搜索并安装“BouncyCastle”包。

以下是一些使用Bouncy Castle处理证书的示例：

验证证书：

using System;
using System.Security.Cryptography.X509Certificates;
using BouncyCastle.Crypto.Parameters;
using BouncyCastle.X509;

public bool ValidateCertificate(string certificatePath, string certificatePassword)
{
    var certStore = new X509Store(StoreName.Root, StoreLocation.LocalMachine);
    certStore.Open(OpenFlags.ReadOnly);
    var cert = certStore.FindCertificateBySubjectName(new X509Name("CN=" + certificateSubject));
    certStore.Close();

    if (cert == null)
        return false;

    var certBytes = cert.Export(X509ContentType.Pfx);
    var certParams = new Pkcs12Parameters(Convert.FromBase64String(certificatePassword), certBytes);
    var certDecryptor = new Pkcs12SafeBagDecryptor(certParams);
    var cert = (X509Certificate2)certDecryptor.Decrypt(certBytes);

    return cert.Verify();
}

创建证书签名请求（CSR）：

using System;
using System.Security.Cryptography.X509Certificates;
using BouncyCastle.Crypto.Parameters;
using BouncyCastle.X509;

public X509Certificate2 CreateCsr(string subjectName, string privateKeyPassword)
{
    var keyPair = GenerateKeyPair();
    var subjectPublicKeyInfo = new SubjectPublicKeyInfo(keyPair.Public);
    var certRequest = new X509CertificateRequest("CN=" + subjectName, subjectPublicKeyInfo, keyPair.Private);

    var certBuilder = new X509v3CertificateBuilder(
        certRequest.Issuer,
        new BigInteger(DateTime.UtcNow.Ticks),
        DateTime.UtcNow,
        DateTime.UtcNow.AddYears(1),
        new DerSequence(new DerInteger(0)),
        subjectPublicKeyInfo);

    var signatureAlgorithm = new AlgorithmIdentifier("SHA256WithRSA", null);
    var signature = keyPair.Private.Sign(certBuilder, signatureAlgorithm);

    var certBytes = certBuilder.Build(signature);
    return new X509Certificate2(certBytes, privateKeyPassword);
}

生成自签名证书：

using System;
using System.Security.Cryptography.X509Certificates;
using BouncyCastle.Crypto.Parameters;
using BouncyCastle.X509;

public X509Certificate2 GenerateSelfSignedCertificate(string subjectName, string privateKeyPassword)
{
    var keyPair = GenerateKeyPair();
    var subjectPublicKeyInfo = new SubjectPublicKeyInfo(keyPair.Public);
    var certBuilder = new X509v3CertificateBuilder(
        new X509Name("CN=" + subjectName),
        new BigInteger(DateTime.UtcNow.Ticks),
        DateTime.UtcNow,
        DateTime.UtcNow.AddYears(1),
        new DerSequence(new DerInteger(0)),
        subjectPublicKeyInfo);

    var signatureAlgorithm = new AlgorithmIdentifier("SHA256WithRSA", null);
    var signature = keyPair.Private.Sign(certBuilder, signatureAlgorithm);

    var certBytes = certBuilder.Build(signature);
    return new X509Certificate2(certBytes, privateKeyPassword);
}

注意：这些示例中的GenerateKeyPair方法需要你自己实现，用于生成RSA密钥对。你可以使用Bouncy Castle的RsaKeyPairGenerator类来生成密钥对。

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