cscの作法 その217

概要

cscの作法、調べてみた。
練習問題やってみた。

練習問題

自己署名証明書を作れ。

サンプルコード

using System;
using System.IO;
using System.Security.Cryptography;
using Org.BouncyCastle.X509;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Crypto.Operators;
using Org.BouncyCastle.Security;
using System.Collections.Generic;
using System.Text;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto.Prng;
using Org.BouncyCastle.OpenSsl;
using Org.BouncyCastle.Pkcs;

static class X509CreateTest {
	static void Main(string[] args) {
		DateTime notBefore = DateTime.Now;
		DateTime notAfter = DateTime.Now.AddYears(1);
		RSA privateKey = new RSACryptoServiceProvider(2048);
		string issuerDN = "CN=127.0.0.1";
		string serialString = "123456789";
		var x509gen = new X509V3CertificateGenerator();
		var serial = new BigInteger(serialString);
		var keyPair = DotNetUtilities.GetKeyPair(privateKey);
		x509gen.SetSerialNumber(serial);
		x509gen.SetIssuerDN(new X509Name(issuerDN));
		x509gen.SetSubjectDN(new X509Name(issuerDN));
		x509gen.SetNotBefore(notBefore);
		x509gen.SetNotAfter(notAfter);
		x509gen.SetPublicKey(keyPair.Public);
		var signerFactory = new Asn1SignatureFactory(PkcsObjectIdentifiers.Sha256WithRsaEncryption.Id, keyPair.Private);
		var cert = x509gen.Generate(signerFactory);
		using (var sw = new StreamWriter("test0.crt"))
		{
			var writer = new PemWriter(sw);
			writer.WriteObject(cert);
		}
		Console.WriteLine("OK");
	}
}

以上。