NetSkycn.Security/RC2Provider.cs

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

namespace NetSkycn.Security
{
    /// <summary>
    /// RC2加密解密
    /// </summary>
    public sealed class RC2Provider
    {
        private RC2Provider()
        {
        }

        public static string Encrypt(string sourceString,string key)
        {
            if (string.IsNullOrEmpty(sourceString))
            {
                throw new ArgumentNullException("encryptString", "不能为空");
            }
            byte[] keyBytes = Encoding.UTF8.GetBytes(key.Substring(0, 8));
            byte[] keyIV = keyBytes;
            byte[] inputByteArray = Encoding.UTF8.GetBytes(sourceString);
            RC2CryptoServiceProvider provider = new RC2CryptoServiceProvider();
            MemoryStream mStream = new MemoryStream();
            CryptoStream cStream = new CryptoStream(mStream, provider.CreateEncryptor(keyBytes, keyIV), CryptoStreamMode.Write);
            cStream.Write(inputByteArray, 0, inputByteArray.Length);
            cStream.FlushFinalBlock();
            return Convert.ToBase64String(mStream.ToArray());
        }

        /// <summary>
        /// RC2解密
        /// </summary>
        /// <param name="decryptString">要解密的字符串</param>
        /// <returns></returns>
        public static string Decrypt(string decryptString,string key)
        {
            if (string.IsNullOrEmpty(decryptString))
            {
                throw new ArgumentNullException("decryptString", "不能为空");
            }
            byte[] keyBytes = Encoding.UTF8.GetBytes(key.Substring(0, 8));
            byte[] keyIV = keyBytes;
            byte[] inputByteArray = Convert.FromBase64String(decryptString);
            RC2CryptoServiceProvider provider = new RC2CryptoServiceProvider();
            MemoryStream mStream = new MemoryStream();
            CryptoStream cStream = new CryptoStream(mStream, provider.CreateDecryptor(keyBytes, keyIV), CryptoStreamMode.Write);
            cStream.Write(inputByteArray, 0, inputByteArray.Length);
            cStream.FlushFinalBlock();
            return Encoding.UTF8.GetString(mStream.ToArray());
        }
    }
}