C#学习教程：使用RSACryptoServiceProvider进行公钥加密分享

这是一个例子：

  public static void rsaPlayground() { byte[] data = new byte[] { 1, 2, 3, 4, 5 }; RSACryptoServiceProvider csp = new RSACryptoServiceProvider();//make a new csp with a new keypair var pub_key = csp.ExportParameters(false); // export public key var priv_key = csp.ExportParameters(true); // export private key var encData = csp.Encrypt(data, false); // encrypt with PKCS#1_V1.5 Padding var decBytes = MyRSAImpl.plainDecryptPriv(encData, priv_key); //decrypt with own BigInteger based implementation var decData = decBytes.SkipWhile(x => x != 0).Skip(1).ToArray();//strip PKCS#1_V1.5 padding } public class MyRSAImpl { private static byte[] rsaOperation(byte[] data, BigInteger exp, BigInteger mod) { BigInteger bData = new BigInteger( data //our data block .Reverse() //BigInteger has another byte order .Concat(new byte[] { 0 }) // append 0 so we are allways handling positive numbers .ToArray() // constructor wants an array ); return BigInteger.ModPow(bData, exp, mod) // the RSA operation itself .ToByteArray() //make bytes from BigInteger .Reverse() // back to "normal" byte order .ToArray(); // return as byte array /* * * A few words on Padding: * * you will want to strip padding after decryption or apply before encryption * */ } public static byte[] plainEncryptPriv(byte[] data, RSAParameters key) { MyRSAParams myKey = MyRSAParams.fromRSAParameters(key); return rsaOperation(data, myKey.privExponent, myKey.Modulus); } public static byte[] plainEncryptPub(byte[] data, RSAParameters key) { MyRSAParams myKey = MyRSAParams.fromRSAParameters(key); return rsaOperation(data, myKey.pubExponent, myKey.Modulus); } public static byte[] plainDecryptPriv(byte[] data, RSAParameters key) { MyRSAParams myKey = MyRSAParams.fromRSAParameters(key); return rsaOperation(data, myKey.privExponent, myKey.Modulus); } public static byte[] plainDecryptPub(byte[] data, RSAParameters key) { MyRSAParams myKey = MyRSAParams.fromRSAParameters(key); return rsaOperation(data, myKey.pubExponent, myKey.Modulus); } } public class MyRSAParams { public static MyRSAParams fromRSAParameters(RSAParameters key) { var ret = new MyRSAParams(); ret.Modulus = new BigInteger(key.Modulus.Reverse().Concat(new byte[] { 0 }).ToArray()); ret.privExpOnent= new BigInteger(key.D.Reverse().Concat(new byte[] { 0 }).ToArray()); ret.pubExpOnent= new BigInteger(key.Exponent.Reverse().Concat(new byte[] { 0 }).ToArray()); return ret; } public BigInteger Modulus; public BigInteger privExponent; public BigInteger pubExponent; } 

以此编码/解码示例为例

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  byte[] toEncryptData = Encoding.ASCII.GetBytes("hello world"); //Generate keys RSACryptoServiceProvider rsaGenKeys = new RSACryptoServiceProvider(); string privateXml = rsaGenKeys.ToXmlString(true); string publicXml = rsaGenKeys.ToXmlString(false); //Encode with public key RSACryptoServiceProvider rsaPublic = new RSACryptoServiceProvider(); rsaPublic.FromXmlString(publicXml); byte[] encryptedRSA = rsaPublic.Encrypt(toEncryptData, false); string EncryptedResult = Encoding.Default.GetString(encryptedRSA); //Decode with private key var rsaPrivate = new RSACryptoServiceProvider(); rsaPrivate.FromXmlString(privateXml); byte[] decryptedRSA = rsaPrivate.Decrypt(encryptedRSA, false); string originalResult = Encoding.Default.GetString(decryptedRSA);