Encrypt and Decrypt with public key and private key(RSA based)

RSAEnryption.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
using System.IO;


namespace ConsoleTester
{
    public class BitConverter
    {
        static public string EncodeTo64(string toEncode)
        {
            byte[] toEncodeAsBytes
                  = System.Text.ASCIIEncoding.ASCII.GetBytes(toEncode);
            string returnValue
                  = System.Convert.ToBase64String(toEncodeAsBytes);
            return returnValue;
        }
        static public string DecodeFrom64(string encodedData)
        {
            byte[] encodedDataAsBytes
                = System.Convert.FromBase64String(encodedData);
            string returnValue =
               System.Text.ASCIIEncoding.ASCII.GetString(encodedDataAsBytes);
            return returnValue;
        }

        static public byte[] GetBytes(string s)
        {
            return Convert.FromBase64String(EncodeTo64(s));
        }

        static public string GetString(byte[] b)
        {
            return DecodeFrom64(Convert.ToBase64String(b));
        }
    }

    class Program
    {
        //Reference:http://stackoverflow.com/questions/21702662/system-security-cryptography-cryptographicexception-bad-length-in-rsacryptoser
        //RSA is only meant to be used for encrypting small amounts of data. The exact amount you can encrypt depends on the key length + the amount used by the padding. A 1024 bit key would allow for a bit above 100 bytes.
        //Since RSA is QUITE SLOW, the usual way to encrypt large messages is using hybrid encryption. In hybrid encryption you use a fast symmetric encryption algorithm (like AES) for encrypting the data with a random key. The random key is then encrypted with RSA and send along with the symmetric key encrypted data.

        static void Main(string[] args)
        {
            string data = "this string is often very short, used for key from symmetric encryption ";
            byte[] binaryData = BitConverter.GetBytes(data);

            //密钥对生成：private key: rsa.ToXmlString(true),  public key rsa.ToXmlString(false);
            //加密用公钥
            RSACryptoServiceProvider rsaPublic = new RSACryptoServiceProvider();
            rsaPublic.FromXmlString("<RSAKeyValue><Modulus>wRF/xutZI+fDG+2381DXXYmcGPdc1QHv7ymVGcAT+YHyjXAdlJlODGhsNT3TRuVc6XTInKblPflPTWt90SQ2llOZuFQyBo6McqZh1yKpquDzhPxMrFeX/hERYMYFapNATvKC+D61/4KCET9UFIJ37X3TYJ5xduo6r66M46DZ9uE=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>");   
            var encryptedBinary = rsaPublic.Encrypt(binaryData, true);

            //解密用私钥
            RSACryptoServiceProvider rsaPrivate = new RSACryptoServiceProvider();
            rsaPrivate.FromXmlString("<RSAKeyValue><Modulus>wRF/xutZI+fDG+2381DXXYmcGPdc1QHv7ymVGcAT+YHyjXAdlJlODGhsNT3TRuVc6XTInKblPflPTWt90SQ2llOZuFQyBo6McqZh1yKpquDzhPxMrFeX/hERYMYFapNATvKC+D61/4KCET9UFIJ37X3TYJ5xduo6r66M46DZ9uE=</Modulus><Exponent>AQAB</Exponent><P>/xqGK4jsKFqPx4kTtWl1g+SuXEcnu/1nfDYz6C2RqI8IqAeYM67NCyyZr+95vKoatrHpJjV3J2iESWnOR27Cyw==</P><Q>wb8r/W1F+9530AoiUySwG1lAX67cpqt5lJj8sSes+YQwbQs2pwcGgK5NXgbDjRZxVjpX2WPUjq5ZULro6ma7gw==</Q><DP>KXWLFqozDz/gnCIoBNS115Cj0bVyvLerSOGaQAKf6JAObRiG4OdoxYcjFxfJZiMTIlv5s07/JXV0AmZisvNKTw==</DP><DQ>mJ8p3gc4fAJxy3ZQN8LM355dMYKj2r91lPM3C66/egcBxsRwlv7XxoKH+6vEW930BgMLtPoJNSRuw0OZuxyWVQ==</DQ><InverseQ>dSdahMN927+HTuKg3AUpkGHPv56XplZDswQriVMBuyVfLZoYnDnMr19ErB/3RcfPjHaocu5L4x9S+KQ5IR6KVQ==</InverseQ><D>mnz/KtP9sy5rwDha3nbMrktDvfKJtORk8pHqff1lvlxOEwEomlSF0IXqODwtiGhWDXTmZftiKlIJM+EUfzqj9gTrZMRJjrI558ukaeLzLJEk1YLMFH94qlMfo17O5YqJ0hor+uLLBGLM5oU0GtiGXJE0T+gR/5gsJZkwtoVrJXU=</D></RSAKeyValue>");   //key created by rsa.ToXmlString(true) and key.pub created by rsa.rsa.ToXmlString(false);
            var decryptedBinary = rsaPrivate.Decrypt(encryptedBinary, true);

            var decryptedString = BitConverter.GetString(decryptedBinary);

            if (data == decryptedString)
            {
                Console.WriteLine("success!");
            }

            Console.ReadKey();
        }
    }
}