42 lines
2.3 KiB
C#
42 lines
2.3 KiB
C#
using System;
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using System.Security.Cryptography.X509Certificates;
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using Org.BouncyCastle.Asn1.X509;
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using Org.BouncyCastle.Crypto;
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using Org.BouncyCastle.Crypto.Generators;
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using Org.BouncyCastle.Crypto.Operators;
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using Org.BouncyCastle.Crypto.Parameters;
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using Org.BouncyCastle.Math;
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using Org.BouncyCastle.Security;
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using Org.BouncyCastle.X509;
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using Org.BouncyCastle.X509.Extension;
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namespace Server.Helper;
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public static class CreateCertificate
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{
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public static X509Certificate2 CreateCertificateAuthority(string caName, int keyStrength)
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{
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SecureRandom random = new SecureRandom();
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RsaKeyPairGenerator rsaKeyPairGenerator = new RsaKeyPairGenerator();
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rsaKeyPairGenerator.Init(new KeyGenerationParameters(random, keyStrength));
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AsymmetricCipherKeyPair asymmetricCipherKeyPair = rsaKeyPairGenerator.GenerateKeyPair();
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X509V3CertificateGenerator x509V3CertificateGenerator = new X509V3CertificateGenerator();
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X509Name issuerDN = new X509Name("CN=" + caName + ",OU=qwqdanchun,O=VenomRAT By qwqdanchun,L=SH,C=CN");
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X509Name subjectDN = new X509Name("CN=VenomRAT");
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BigInteger serialNumber = BigInteger.ProbablePrime(160, new SecureRandom());
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x509V3CertificateGenerator.SetSerialNumber(serialNumber);
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x509V3CertificateGenerator.SetSubjectDN(subjectDN);
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x509V3CertificateGenerator.SetIssuerDN(issuerDN);
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x509V3CertificateGenerator.SetNotAfter(DateTime.UtcNow.Subtract(new TimeSpan(-3650, 0, 0, 0)));
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x509V3CertificateGenerator.SetNotBefore(DateTime.UtcNow.Subtract(new TimeSpan(285, 0, 0, 0)));
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x509V3CertificateGenerator.SetPublicKey(asymmetricCipherKeyPair.Public);
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x509V3CertificateGenerator.AddExtension(X509Extensions.SubjectKeyIdentifier, critical: false, new SubjectKeyIdentifierStructure(asymmetricCipherKeyPair.Public));
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x509V3CertificateGenerator.AddExtension(X509Extensions.BasicConstraints, critical: true, new BasicConstraints(cA: true));
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ISignatureFactory signatureCalculatorFactory = new Asn1SignatureFactory("SHA512WITHRSA", asymmetricCipherKeyPair.Private, random);
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return new X509Certificate2(DotNetUtilities.ToX509Certificate(x509V3CertificateGenerator.Generate(signatureCalculatorFactory)))
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{
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PrivateKey = DotNetUtilities.ToRSA(asymmetricCipherKeyPair.Private as RsaPrivateCrtKeyParameters)
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};
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}
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}
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