用Bouncy Castle的C#版API产生公钥和私钥

开源API链接地址：The Legion of the Bouncy Castle

     Bouncy Castle，简称为BC，原本是java的一个开源JCE提供者，后来也提供了C#版本的API，我下载其编译好的DLL，在C#项目中直接引用，用其几个API，产生我指定位数的公钥和私钥（目前是1024位，但产生CA的密钥时，要2048位才能满足安全需求）。虽然开源很好很强大，但这个API就是文档很缺陷，C#的文档更是少得可怜，没办法，下载源代码慢慢看吧。。。

     在接下来的几篇关于CA文章中，大体按下面链接网址的思路去整理，不过整理出来的是C#版本的实现，基本目标架设一个CA，产生用户使用的数字证书。网页链接：bouncycastle 产生证书 

     产生密钥，主要是用RsaKeyPairGenerator，根据参数RsaKeyGenerationParameters，产生一个密钥对，再分离出公钥和私钥，再用公钥和私钥进行加解密。

RsaKeyPairGenerator的类，类中的其他类自行加载“BouncyCastle.Crypto.dll”到VS中自行查看

namespace Org.BouncyCastle.Crypto.Generators
{
    public class RsaKeyPairGenerator : IAsymmetricCipherKeyPairGenerator
    {
        public RsaKeyPairGenerator();
        public AsymmetricCipherKeyPair GenerateKeyPair();
        public void Init(KeyGenerationParameters parameters);
    }
}

namespace Org.BouncyCastle.Crypto.Generators { public class RsaKeyPairGenerator : IAsymmetricCipherKeyPairGenerator { public RsaKeyPairGenerator(); public AsymmetricCipherKeyPair GenerateKeyPair(); public void Init(KeyGenerationParameters parameters); } }

 

接口IAsymmetricBlockCipher，RSA加解密算法实现的类，就是继承了该接口

namespace Org.BouncyCastle.Crypto
{
    public interface IAsymmetricBlockCipher
    {
        string AlgorithmName { get; }
        int GetInputBlockSize();
        int GetOutputBlockSize();
        void Init(bool forEncryption, ICipherParameters parameters);
        byte[] ProcessBlock(byte[] inBuf, int inOff, int inLen);
    }
}

namespace Org.BouncyCastle.Crypto { public interface IAsymmetricBlockCipher { string AlgorithmName { get; } int GetInputBlockSize(); int GetOutputBlockSize(); void Init(bool forEncryption, ICipherParameters parameters); byte[] ProcessBlock(byte[] inBuf, int inOff, int inLen); } }

 

测试代码：

using System;
using System.Collections.Generic;
using System.Text;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Crypto.Engines;  //IAsymmetricBlockCipher engine = new RsaEngine();
namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //RSA密钥对的构造器
            RsaKeyPairGenerator keyGenerator = new RsaKeyPairGenerator();

            //RSA密钥构造器的参数
            RsaKeyGenerationParameters param = new RsaKeyGenerationParameters(
                Org.BouncyCastle.Math.BigInteger.ValueOf(3),
                new Org.BouncyCastle.Security.SecureRandom(),
                1024,   //密钥长度
                25);
            //用参数初始化密钥构造器
            keyGenerator.Init(param);
            //产生密钥对
            AsymmetricCipherKeyPair keyPair = keyGenerator.GenerateKeyPair();
            //获取公钥和密钥
            AsymmetricKeyParameter publicKey = keyPair.Public;
            AsymmetricKeyParameter privateKey = keyPair.Private;
            if( ((RsaKeyParameters)publicKey).Modulus.BitLength<1024 )
            {
                Console.WriteLine("failed key generation (1024) length test");
            }
            //一个测试……………………
            //输入，十六进制的字符串，解码为byte[]
            //string input = "4e6f77206973207468652074696d6520666f7220616c6c20676f6f64206d656e";
            //byte[] testData = Org.BouncyCastle.Utilities.Encoders.Hex.Decode(input);
            string input = "popozh RSA test";
            byte[] testData = Encoding.UTF8.GetBytes(input);
            Console.WriteLine("明文:" + input + Environment.NewLine);
            //非对称加密算法，加解密用
            IAsymmetricBlockCipher engine = new RsaEngine();
            //公钥加密
            engine.Init(true, publicKey);
            try
            {
                testData = engine.ProcessBlock(testData, 0, testData.Length);
                Console.WriteLine("密文（base64编码）:" + Convert.ToBase64String(testData) + Environment.NewLine);
            }
            catch (Exception ex)
            {
                Console.WriteLine("failed - exception " + Environment.NewLine + ex.ToString());
            }
            //私钥解密
            engine.Init(false, privateKey);
            try
            {
                testData = engine.ProcessBlock(testData, 0, testData.Length);

            }
            catch (Exception e)
            {
                Console.WriteLine("failed - exception " + e.ToString());
            }
            if (input.Equals(Encoding.UTF8.GetString(testData)))
            {
                Console.WriteLine("解密成功");
            }
            Console.Read();
        }
    }
}

using System; using System.Collections.Generic; using System.Text; using Org.BouncyCastle.Crypto.Generators; using Org.BouncyCastle.Crypto.Parameters; using Org.BouncyCastle.Crypto; using Org.BouncyCastle.Security; using Org.BouncyCastle.Crypto.Engines; //IAsymmetricBlockCipher engine = new RsaEngine(); namespace ConsoleApplication1 { class Program { static void Main(string[] args) { //RSA密钥对的构造器 RsaKeyPairGenerator keyGenerator = new RsaKeyPairGenerator(); //RSA密钥构造器的参数 RsaKeyGenerationParameters param = new RsaKeyGenerationParameters( Org.BouncyCastle.Math.BigInteger.ValueOf(3), new Org.BouncyCastle.Security.SecureRandom(), 1024, //密钥长度 25); //用参数初始化密钥构造器 keyGenerator.Init(param); //产生密钥对 AsymmetricCipherKeyPair keyPair = keyGenerator.GenerateKeyPair(); //获取公钥和密钥 AsymmetricKeyParameter publicKey = keyPair.Public; AsymmetricKeyParameter privateKey = keyPair.Private; if( ((RsaKeyParameters)publicKey).Modulus.BitLength<1024 ) { Console.WriteLine("failed key generation (1024) length test"); } //一个测试…………………… //输入，十六进制的字符串，解码为byte[] //string input = "4e6f77206973207468652074696d6520666f7220616c6c20676f6f64206d656e"; //byte[] testData = Org.BouncyCastle.Utilities.Encoders.Hex.Decode(input); string input = "popozh RSA test"; byte[] testData = Encoding.UTF8.GetBytes(input); Console.WriteLine("明文:" + input + Environment.NewLine); //非对称加密算法，加解密用 IAsymmetricBlockCipher engine = new RsaEngine(); //公钥加密 engine.Init(true, publicKey); try { testData = engine.ProcessBlock(testData, 0, testData.Length); Console.WriteLine("密文（base64编码）:" + Convert.ToBase64String(testData) + Environment.NewLine); } catch (Exception ex) { Console.WriteLine("failed - exception " + Environment.NewLine + ex.ToString()); } //私钥解密 engine.Init(false, privateKey); try { testData = engine.ProcessBlock(testData, 0, testData.Length); } catch (Exception e) { Console.WriteLine("failed - exception " + e.ToString()); } if (input.Equals(Encoding.UTF8.GetString(testData))) { Console.WriteLine("解密成功"); } Console.Read(); } } }

 

BC的API源代码中，以上的代码测试思路来自：csharp/crypto/test/src/crypto/test/RsaTest.cs，可以定位到该CS文件参考官方提供的测试和代码