如何使用BouncyCastle生成根證書，然後生成由該根證書籤名的站點證書？

Question

我在嘗試構建一個自我託管的服務，使用WebAPI和SSL，我需要能夠自行生成SSL證書才能使用。我希望能夠從C#這樣做。我一直在玩BouncyCastle。

我需要生成2個證書，一個根和一個站點證書。然後，我需要將它們安裝在Windows中正確的位置。

我無法弄清楚如何使我的第二個證書引用我的根ca.我試過的一切都讓我感到不可信的證書錯誤。任何幫助，將不勝感激。

Answer 1

這就是我所做的（我正在使用DSA，但如果您使用RSA，只需更改密鑰生成）。

public void IssueClientFromCA() 
{ 
    // get CA 
    string caCn = "MyCA CommonName"; 
    Stream caCertFile = File.OpenRead(string.Format(@"{0}\{1}", _certificatesDir, "MyCAFile.pfx")); 
    char[] caPass = "passwordForThePfx".ToCharArray(); 

    Pkcs12Store store = new Pkcs12StoreBuilder().Build(); 
    store.Load(caCertFile, caPass);    
    var caCert = store.GetCertificate(caCn).Certificate; 
    var caPrivKey = store.GetKey(caCn).Key; 

    var clientCert = CertIssuer.GenerateDsaCertificateAsPkcs12(
     "My Client FriendlyName", 
     "My Client SubjectName", 
     "GT", 
     new DateTime(2011,9,19), 
     new DateTime(2014,9,18), 
     "PFXPASS", 
     caCert, 
     caPrivKey); 

    var saveAS = string.Format(@"{0}\{1}", _certificatesDir, "clientCertFile.pfx"); 
    File.WriteAllBytes(saveAS, clientCert); 
} 

public static byte[] GenerateDsaCertificateAsPkcs12(
    string friendlyName, 
    string subjectName, 
    string country, 
    DateTime validStartDate, 
    DateTime validEndDate, 
    string password, 
    Org.BouncyCastle.X509.X509Certificate caCert, 
    AsymmetricKeyParameter caPrivateKey) 
{ 
    var keys = GenerateDsaKeys(); 

    #region build certificate 
    var certGen = new X509V3CertificateGenerator(); 

    // build name attributes 
    var nameOids = new ArrayList(); 
    nameOids.Add(Org.BouncyCastle.Asn1.X509.X509Name.CN); 
    nameOids.Add(X509Name.O); 
    nameOids.Add(X509Name.C); 

    var nameValues = new ArrayList(); 
    nameValues.Add(friendlyName); 
    nameValues.Add(subjectName); 
    nameValues.Add(country); 
    var subjectDN = new X509Name(nameOids, nameValues); 

    // certificate fields 
    certGen.SetSerialNumber(BigInteger.ValueOf(1)); 
    certGen.SetIssuerDN(caCert.SubjectDN); 
    certGen.SetNotBefore(validStartDate); 
    certGen.SetNotAfter(validEndDate); 
    certGen.SetSubjectDN(subjectDN); 
    certGen.SetPublicKey(keys.Public); 
    certGen.SetSignatureAlgorithm("SHA1withDSA"); 

    // extended information 
    certGen.AddExtension(X509Extensions.AuthorityKeyIdentifier, false, new AuthorityKeyIdentifierStructure(caCert.GetPublicKey())); 
    certGen.AddExtension(X509Extensions.SubjectKeyIdentifier, false, new SubjectKeyIdentifierStructure(keys.Public)); 
    #endregion 

    // generate x509 certificate 
    var cert = certGen.Generate(caPrivateKey); 
    //ert.Verify(caCert.GetPublicKey()); 

    var chain = new Dictionary<string, Org.BouncyCastle.X509.X509Certificate>(); 
    //chain.Add("CertiFirmas CA", caCert); 
    var caCn = caCert.SubjectDN.GetValues(X509Name.CN)[0].ToString(); 
    chain.Add(caCn, caCert); 

    // store the file 
    return GeneratePkcs12(keys, cert, friendlyName, password, chain); 
} 

private static byte[] GeneratePkcs12(AsymmetricCipherKeyPair keys, Org.BouncyCastle.X509.X509Certificate cert, string friendlyName, string password, 
    Dictionary<string, Org.BouncyCastle.X509.X509Certificate> chain) 
{ 
    var chainCerts = new List<X509CertificateEntry>(); 

    // Create the PKCS12 store 
    Pkcs12Store store = new Pkcs12StoreBuilder().Build(); 

    // Add a Certificate entry 
    X509CertificateEntry certEntry = new X509CertificateEntry(cert); 
    store.SetCertificateEntry(friendlyName, certEntry); // use DN as the Alias. 
    //chainCerts.Add(certEntry); 

    // Add chain entries 
    var additionalCertsAsBytes = new List<byte[]>(); 
    if (chain != null && chain.Count > 0) 
    { 
     foreach (var additionalCert in chain) 
     { 
      additionalCertsAsBytes.Add(additionalCert.Value.GetEncoded()); 
     } 
    } 

    if (chain != null && chain.Count > 0) 
    { 
     var addicionalCertsAsX09Chain = BuildCertificateChainBC(cert.GetEncoded(), additionalCertsAsBytes); 

     foreach (var addCertAsX09 in addicionalCertsAsX09Chain) 
     { 
      chainCerts.Add(new X509CertificateEntry(addCertAsX09)); 
     } 
    } 

    // Add a key entry 
    AsymmetricKeyEntry keyEntry = new AsymmetricKeyEntry(keys.Private); 

    // no chain 
    store.SetKeyEntry(friendlyName, keyEntry, new X509CertificateEntry[] { certEntry }); 

    using (var memoryStream = new MemoryStream()) 
    { 
     store.Save(memoryStream, password.ToCharArray(), new SecureRandom()); 
     return memoryStream.ToArray(); 
    } 
} 

缺少一些方法：

static IEnumerable<Org.BouncyCastle.X509.X509Certificate> BuildCertificateChainBC(byte[] primary, IEnumerable<byte[]> additional) 
{ 
    X509CertificateParser parser = new X509CertificateParser(); 
    PkixCertPathBuilder builder = new PkixCertPathBuilder(); 

    // Separate root from itermediate 
    var intermediateCerts = new List<Org.BouncyCastle.X509.X509Certificate>(); 
    HashSet rootCerts = new HashSet(); 

    foreach (byte[] cert in additional) 
    { 
     var x509Cert = parser.ReadCertificate(cert); 

     // Separate root and subordinate certificates 
     if (x509Cert.IssuerDN.Equivalent(x509Cert.SubjectDN)) 
      rootCerts.Add(new TrustAnchor(x509Cert, null)); 
     else 
      intermediateCerts.Add(x509Cert); 
    } 

    // Create chain for this certificate 
    X509CertStoreSelector holder = new X509CertStoreSelector(); 
    holder.Certificate = parser.ReadCertificate(primary); 

    // WITHOUT THIS LINE BUILDER CANNOT BEGIN BUILDING THE CHAIN 
    intermediateCerts.Add(holder.Certificate); 

    PkixBuilderParameters builderParams = new PkixBuilderParameters(rootCerts, holder); 
    builderParams.IsRevocationEnabled = false; 

    X509CollectionStoreParameters intermediateStoreParameters = 
     new X509CollectionStoreParameters(intermediateCerts); 

    builderParams.AddStore(X509StoreFactory.Create(
     "Certificate/Collection", intermediateStoreParameters)); 

    PkixCertPathBuilderResult result = builder.Build(builderParams); 

    return result.CertPath.Certificates.Cast<Org.BouncyCastle.X509.X509Certificate>(); 
} 

private static AsymmetricCipherKeyPair GenerateDsaKeys() 
{ 
    DSACryptoServiceProvider DSA = new DSACryptoServiceProvider(); 
    var dsaParams = DSA.ExportParameters(true); 
    AsymmetricCipherKeyPair keys = DotNetUtilities.GetDsaKeyPair(dsaParams); 
    return keys; 
} 

另外：你必須安裝你的CA證書到客戶機的可信的CA存儲，以及客戶端證書（也可能是在個人或ThirdParty商店）。