目录

[1]AES加密算法和DES加密算法的效率比较 [2]AES和DES加密解密代码

/// <summary>///  DES加密/// </summary>/// <param name="pToEncrypt">要加密的内容</param>/// <param name="sKey">密钥</param>/// <param name="StrMs">输出加密后的字符串</param>/// <returns>加密后的byte数组</returns>public static byte[] Encrypt(string pToEncrypt, string sKey, out string StrMs){//访问数据加密标准(DES)算法的加密服务提供程序 (CSP) 版本的包装对象DESCryptoServiceProvider des = new DESCryptoServiceProvider();des.Mode = CipherMode.ECB;des.Padding = PaddingMode.PKCS7;des.Key = Encoding.UTF8.GetBytes(sKey);　//建立加密对象的密钥和偏移量//des.IV = Encoding.UTF8.GetBytes(sKey);　 // 如果是用ECB模式，则IV不管是什么都不会影响加密/解密的结果byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);//把字符串放到byte数组中
MemoryStream ms = new MemoryStream();//创建其支持存储区为内存的流　CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);//定义将数据流链接到加密转换的流cs.Write(inputByteArray, 0, inputByteArray.Length);//上面已经完成了把加密后的结果放到内存中去
        cs.FlushFinalBlock();        StringBuilder ret = new StringBuilder();foreach (byte b in ms.ToArray()){ret.AppendFormat("{0:X2}", b);}StrMs = ret.ToString();return ms.ToArray();}/// <summary>/// DEs 解密过程/// </summary>/// <param name="pToDecrypt">被解密的字符串</param>/// <param name="sKey">密钥（只支持8个字节的密钥，同前面的加密密钥相同）</param>/// <returns>返回被解密的字符串</returns>public static string Decrypt(string pToDecrypt, string sKey){DESCryptoServiceProvider des = new DESCryptoServiceProvider();des.Mode = CipherMode.ECB;des.Padding = PaddingMode.PKCS7;byte[] inputByteArray = new byte[pToDecrypt.Length / 2];for (int x = 0; x < pToDecrypt.Length / 2; x++){int i = (Convert.ToInt32(pToDecrypt.Substring(x * 2, 2), 16));inputByteArray[x] = (byte)i;}des.Key = Encoding.UTF8.GetBytes(sKey);　//建立加密对象的密钥和偏移量，此值重要，不能修改//des.IV = Encoding.UTF8.GetBytes(sKey);// 如果是用ECB模式，则IV不管是什么都不会影响加密/解密的结果MemoryStream ms = new MemoryStream();CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);cs.Write(inputByteArray, 0, inputByteArray.Length);cs.FlushFinalBlock();return System.Text.Encoding.UTF8.GetString(ms.ToArray());}

/// <summary>/// AES加密/// </summary>/// <param name="toEncrypt">要加密的内容</param>/// <param name="strKey">密钥（16或者32位）</param>/// <returns>Base64转码后的密文</returns>public static string Encrypt(string toEncrypt, string strKey){byte[] keyArray = UTF8Encoding.UTF8.GetBytes(strKey);byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);RijndaelManaged rDel = new RijndaelManaged();//using System.Security.Cryptography;    rDel.Key = keyArray;rDel.Mode = CipherMode.ECB;//using System.Security.Cryptography;    rDel.Padding = PaddingMode.PKCS7;//using System.Security.Cryptography;
ICryptoTransform cTransform = rDel.CreateEncryptor();//using System.Security.Cryptography;    byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);return Convert.ToBase64String(resultArray, 0, resultArray.Length);}/// <summary>/// AES解密/// </summary>/// <param name="toDecrypt">要解密的内容</param>/// <param name="strKey">密钥（16或者32位）</param>/// <returns>解密后的明文</returns>public static string Decrypt(string toDecrypt, string strKey){byte[] keyArray = UTF8Encoding.UTF8.GetBytes(strKey);byte[] toEncryptArray = Convert.FromBase64String(toDecrypt);RijndaelManaged rDel = new RijndaelManaged();rDel.Key = keyArray;rDel.Mode = CipherMode.ECB;rDel.Padding = PaddingMode.PKCS7;ICryptoTransform cTransform = rDel.CreateDecryptor();byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);return UTF8Encoding.UTF8.GetString(resultArray);}#endregion AES解密
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