非对称加密类

摘自http://topic.csdn.net/u/20101231/09/039bdd22-3f0a-4bbb-908e-d887b4d7bbfe.html?19933

using System;
using System.Text;
using System.Security.Cryptography;

/// <summary>
/// 非对称加密类
/// </summary>
public static class AsymmetricEncrytClass
{
    #region 自动生成公钥、私钥方法
    /// <summary>
    /// 自动生成非对称公钥、私钥
    /// </summary>
    /// <param name="publicKey">返回的公钥</param>
    /// <param name="privateKey">返回的私钥</param>
    public static void GenerateKey(out string publicKey, out string privateKey)
    {
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        publicKey = rsa.ToXmlString(false);
        privateKey = rsa.ToXmlString(true);
    }

    #endregion
    #region 非对称加密代码
    /// <summary>
    /// 非对称加密方法
    /// </summary>
    /// <param name="strMsg">要加密的数据</param>
    /// <param name="strPublicKey">加密的公钥</param>
    /// <returns>返回加密后的byte[]数据</returns>
    public static byte[] AsymmetricEncryptRSAFunction(this string strMsg, string strPublicKey)
    {
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        rsa.FromXmlString(strPublicKey);
        byte[] buffers = Encoding.UTF8.GetBytes(strMsg);
        byte[] encryBuffer;
        try
        {
            encryBuffer = rsa.Encrypt(buffers, false);
        }
        catch
        {
            return null;
        }
        return encryBuffer;
    }
    #endregion
    #region 非对称解密代码
    /// <summary>
    /// 非对称解密方法
    /// </summary>
    /// <param name="byteMsg">需要解密的byte[]类型数据</param>
    /// <param name="strPrivateKey">解密的私钥</param>
    /// <returns>解密后的数据string类型</returns>
    public static string AsymmetricDecryptRSAFunction(this byte[] byteMsg, string strPrivateKey)
    {
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        rsa.FromXmlString(strPrivateKey);
        byte[] decryptBuffers;
        try
        {
            decryptBuffers = rsa.Decrypt(byteMsg, false);
        }
        catch (Exception e)
        {
            return e.Message;
        }
        return Encoding.UTF8.GetString(decryptBuffers);
    }
    #endregion
}