RSA加密

加密原理

RSA加密演算法:http://zh.wikipedia.org/wiki/RSA%E5%8A%A0%E5%AF%86%E6%BC%94%E7%AE%97%E6%B3%95

用实例给新手讲解RSA加密算法:http://www.cfca.com.cn/zhishi/wz-012.htm

 

应用

java程序使用生成一个RSA生成一对秘钥,Net程序要使用私钥对消息签名,发送给Java端。

怎么在net中读取PKCS#8 私钥并签名?

最简单使用外部组件

System.Security.Cryptography, BouncyCastle, OpenSSL.Net and Chilkat RSA

用Security.Cryptography ,需要net3.5以上的框架

byte[] dataToSign = Encoding.UTF8.GetBytes("Data to sign");
using (CngKey signingKey = CngKey.Import(pkcs8PrivateKey, CngKeyBlobFormat.Pkcs8PrivateBlob))
  using (RSACng rsa = new RSACng(signingKey))
  {
    rsa.SignatureHashAlgorithm = CngAlgorithm.MD5;
    return rsa.SignData(dataToSign);
  }

BouncyCastle

        /// <summary>
        /// 获取数据签名
        /// </summary>
        /// <param name="source">数据</param>
        /// <param name="keyPath">私钥文件路径</param>
        /// <returns>签名后的信息</returns>
        public static string GetSignString(string data, string keyPath)
        {
            if (string.IsNullOrEmpty(data))
            {
                return string.Empty;
            }

            byte[] dataKey = File.ReadAllBytes(keyPath);
            var key = PrivateKeyFactory.CreateKey(dataKey);
            ISigner sig = SignerUtilities.GetSigner("MD5withRSA");

            /* Populate key */
            sig.Init(true, key);

            /* Get the bytes to be signed from the string */
            var bytes = Encoding.UTF8.GetBytes(data);

            /* Calc the signature */
            sig.BlockUpdate(bytes, 0, bytes.Length);
            byte[] signature = sig.GenerateSignature();

            /* Base 64 encode the sig so its 8-bit clean */
            //var signedstring = Convert.ToBase64String(signature);

            return signature.ToBase64();
        }

  OpenSSL

byte[] msg = System.Text.Encoding.ASCII.GetBytes("text to encrypt");
OpenSSL.Crypto.RSA rsa = new OpenSSL.Crypto.RSA();
byte[]result = rsa.PrivateEncrypt(msg, OpenSSL.Crypto.RSA.Padding.None);
Console.WriteLine(Convert.ToBase64String(result));

  

 NET采用的加密填充标准是PKCS1Padding,由于java的rsa默认的加密没有使用填充算法,导致采用同样的秘钥加密的结果都不一样,其实java同样支持这一填充标准

//进行加密  参数“RSA/ECB/PKCS1Padding”,代表和.NET用相同的填充算法
        Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");     
       cipher.init(Cipher.ENCRYPT_MODE, publicKey);     
       byte[] enBytes = cipher.doFinal(str_m.getBytes());     
       String s = (new BASE64Encoder()).encodeBuffer(enBytes);  
       System.out.println("加密结果为:" + s);  

  

 

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