54 lines
2.2 KiB
C#
54 lines
2.2 KiB
C#
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.Crypto.Prng;
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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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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Security.Cryptography.X509Certificates;
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using System.Text;
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using System.Threading.Tasks;
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namespace AsyncRAT_Sharp.Helper
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{
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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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var random = new SecureRandom(new CryptoApiRandomGenerator());
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var keyPairGen = new RsaKeyPairGenerator();
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keyPairGen.Init(new KeyGenerationParameters(random, keyStrength));
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AsymmetricCipherKeyPair keypair = keyPairGen.GenerateKeyPair();
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var certificateGenerator = new X509V3CertificateGenerator();
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var CN = new X509Name("CN=" + caName);
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var SN = BigInteger.ProbablePrime(120, random);
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certificateGenerator.SetSerialNumber(SN);
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certificateGenerator.SetSubjectDN(CN);
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certificateGenerator.SetIssuerDN(CN);
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certificateGenerator.SetNotAfter(DateTime.MaxValue);
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certificateGenerator.SetNotBefore(DateTime.UtcNow.Subtract(new TimeSpan(2, 0, 0, 0)));
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certificateGenerator.SetPublicKey(keypair.Public);
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certificateGenerator.AddExtension(X509Extensions.SubjectKeyIdentifier, false, new SubjectKeyIdentifierStructure(keypair.Public));
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certificateGenerator.AddExtension(X509Extensions.BasicConstraints, true, new BasicConstraints(true));
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ISignatureFactory signatureFactory = new Asn1SignatureFactory("SHA512WITHRSA", keypair.Private, random);
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var certificate = certificateGenerator.Generate(signatureFactory);
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var certificate2 = new X509Certificate2(DotNetUtilities.ToX509Certificate(certificate));
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certificate2.PrivateKey = DotNetUtilities.ToRSA(keypair.Private as RsaPrivateCrtKeyParameters);
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return certificate2;
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}
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}
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}
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