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云代码 - c#代码库

对称加密3DES加解密

2013-11-22 作者： 小蜜锋举报

[c#]代码库

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Security.Cryptography;
 
namespace Kad.ThridParty.ChinaPayWap
{
    /// <summary>
    /// 对称加密3DES加解密，代码来源于网络
    /// </summary>
    internal class TripleDESHelper
    {
 
        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="toEncrypt">要加密的字符串，即明文</param>
        /// <param name="key">公共密钥</param>
        /// <param name="useHashing">是否使用MD5生成机密秘钥</param>
        /// <returns>加密后的字符串，即密文</returns>
        public static string Encrypt(string toEncrypt, string key, bool useHashing)
        {
            try
            {
                byte[] keyArray;
                byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);
 
                if (useHashing)
                {
                    MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
                    keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
                }
                else
                    keyArray = UTF8Encoding.UTF8.GetBytes(key);
 
                TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
 
                tdes.Key = keyArray;
                tdes.Mode = CipherMode.ECB;
                tdes.Padding = PaddingMode.PKCS7;
 
                ICryptoTransform cTransform = tdes.CreateEncryptor();
                byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
 
                return Convert.ToBase64String(resultArray, 0, resultArray.Length);
            }
            catch
            {
 
            }
            return string.Empty;
        }
        public static string Encrypt(byte[] toEncryptArray, string key, bool useHashing)
        {
            try
            {
                byte[] keyArray;
                //byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);
 
                if (useHashing)
                {
                    MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
                    keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
                }
                else
                    keyArray = UTF8Encoding.UTF8.GetBytes(key);
 
                TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
 
                tdes.Key = keyArray;
                tdes.Mode = CipherMode.ECB;
                tdes.Padding = PaddingMode.PKCS7;
 
                ICryptoTransform cTransform = tdes.CreateEncryptor();
                byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
 
                return Convert.ToBase64String(resultArray, 0, resultArray.Length);
            }
            catch
            {
 
            }
            return string.Empty;
        }
 
        /// <summary>
        /// 解密
        /// </summary>
        /// <param name="toDecrypt">要解密的字符串，即密文</param>
        /// <param name="key">公共密钥</param>
        /// <param name="useHashing">是否使用MD5生成机密密钥</param>
        /// <returns>解密后的字符串，即明文</returns>
        public static string Decrypt(string toDecrypt, string key, bool useHashing)
        {
            try
            {
                byte[] keyArray;
                byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);
 
                if (useHashing)
                {
                    MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
                    keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
                }
                else
                    keyArray = UTF8Encoding.UTF8.GetBytes(key);
 
                TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
                tdes.Key = keyArray;
                tdes.Mode = CipherMode.ECB;
                tdes.Padding = PaddingMode.PKCS7;
 
                ICryptoTransform cTransform = tdes.CreateDecryptor();
                byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
 
                return UTF8Encoding.UTF8.GetString(resultArray);
 
            }
            catch
            {
 
            }
            return string.Empty;
        }
        public static string Decrypt(byte[] toEncryptArray, string key, bool useHashing)
        {
            try
            {
                byte[] keyArray;
                //byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);
 
                if (useHashing)
                {
                    MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
                    keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
                }
                else
                    keyArray = UTF8Encoding.UTF8.GetBytes(key);
 
                TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
                tdes.Key = keyArray;
                tdes.Mode = CipherMode.ECB;
                tdes.Padding = PaddingMode.PKCS7;
 
                ICryptoTransform cTransform = tdes.CreateDecryptor();
                byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
 
                return UTF8Encoding.UTF8.GetString(resultArray);
 
            }
            catch
            {
 
            }
            return string.Empty;
        }
 
    }
}


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