asp.net的DES加密和解密算法
/// <summary> /// DES(56位) /// DES算法为密码体制中的对称密码体制，又被成为美国数据加密标准，是1972年美国IBM公司研制的对称密码体制加密算法。 /// 其密钥长度为56位，明文按64位进行分组，将分组后的明文组和56位的密钥按位替代或交换的方法形成密文组的加密方法。 /// </summary> public class DES { #region 公用des /// <summary> /// 改变密钥向量 /// </summary> public void ChangeKeys() { Keys = PuKeys; } /// <summary> /// 改变密钥向量 /// </summary> /// <param name="keys">自定义向量</param> public void ChangeKeys(byte[] keys) { if (keys.Length != 8) { throw new Exception("必须是8 为的 byte"); } Keys = keys; } //默认密钥向量 static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; /// <summary> /// 自定义公共 /// </summary> public static byte[] PuKeys = { 0x15, 0x1, 0x0, 0x78, 0x91, 0xAD, 0x1D, 0xCF }; /// <summary> /// 默认密钥 /// </summary> static string okey = "CMDKDCJC"; /// <summary> /// DES加密字符串 /// </summary> /// <param name="encryptString">待加密的字符串</param> /// <param name="encryptKey">加密密钥,要求为8位</param> public static string EncryptDES(string encryptString) { return EncryptDES(encryptString, okey); } /// <summary> /// DES加密字符串 /// </summary> /// <param name="encryptString">待加密的字符串</param> /// <param name="encryptKey">加密密钥,要求为8位</param> /// <returns>加密成功返回加密后的字符串，失败返回源串</returns> public static string EncryptDES(string encryptString, string encryptKey) { try { byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8)); byte[] rgbIV = Keys; byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString); DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider(); MemoryStream mStream = new MemoryStream(); CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey,rgbIV), CryptoStreamMode.Write); cStream.Write(inputByteArray, 0, inputByteArray.Length); cStream.FlushFinalBlock(); return Convert.ToBase64String(mStream.ToArray()); } catch { return encryptString; } } /// <summary> /// DES解密字符串 /// </summary> /// <param name="decryptString">待解密的字符串</param> /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param> /// <returns>解密成功返回解密后的字符串，失败返源串</returns> public static string DecryptDES(string decryptString) { return DecryptDES(decryptString, okey); } /// <summary> /// DES解密字符串 /// </summary> /// <param name="decryptString">待解密的字符串</param> /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param> /// <returns>解密成功返回解密后的字符串，失败返源串</returns> public static string DecryptDES(string decryptString, string decryptKey) { try { byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey); byte[] rgbIV = Keys; byte[] inputByteArray = Convert.FromBase64String(decryptString); DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider(); MemoryStream mStream = new MemoryStream(); CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey,rgbIV), CryptoStreamMode.Write); cStream.Write(inputByteArray, 0, inputByteArray.Length); cStream.FlushFinalBlock(); return Encoding.UTF8.GetString(mStream.ToArray()); } catch { return decryptString; } } #endregion #region /// <summary> /// des解密方式 /// </summary> /// <param name="mq">密文</param> /// <param name="Key">密钥</param> /// <param name="Vector"></param> /// <returns></returns> public static Byte[] Decrypt(String mq, String Key, String Vector) { Byte[] Data = Convert.FromBase64String(mq); Byte[] bKey = new Byte[8]; bKey[0] = 82; bKey[1] = 82; bKey[2] = 79; bKey[3] = 70; bKey[4] = 79; bKey[5] = 84; bKey[6] = 79; bKey[7] = 69; Array.Copy(Encoding.UTF8.GetBytes(Key.PadRight(bKey.Length)), bKey, bKey.Length); Byte[] bVector = new Byte[8]; bVector = bKey; Array.Copy(Encoding.UTF8.GetBytes(Vector.PadRight(bVector.Length)), bVector, bVector.Length); Byte[] original = null; DESCryptoServiceProvider CryptoProvider = new DESCryptoServiceProvider(); CryptoProvider.Mode = CipherMode.ECB; //CryptoProvider.Padding = PaddingMode.Zeros; try { // 开辟一块内存流，存储密文 using (MemoryStream Memory = new MemoryStream(Data)) { // 把内存流对象包装成加密流对象 using (CryptoStream Decryptor = new CryptoStream(Memory, CryptoProvider.CreateDecryptor(bKey, bVector), CryptoStreamMode.Read)) { // 明文存储区 using (MemoryStream originalMemory = new MemoryStream()) { Byte[] Buffer = new Byte[1024]; Int32 readBytes = 0; while ((readBytes = Decryptor.Read(Buffer, 0, Buffer.Length)) > 0) { originalMemory.Write(Buffer, 0, readBytes); } original = originalMemory.ToArray(); } } } } catch(Exception e) { original = null; } return original; } /// <summary> /// DES加密方法 /// </summary> /// <param name="strPlain">明文</param> /// <param name="strDESKey">密钥</param> /// <param name="strDESIV">向量</param> /// <returns>密文</returns> public static string DESEncrypt(string strPlain, string strDESKey, string strDESIV) { Byte[] bytesDESKey = new Byte[8]; bytesDESKey[0] = 82; bytesDESKey[1] = 82; bytesDESKey[2] = 79; bytesDESKey[3] = 70; bytesDESKey[4] = 79; bytesDESKey[5] = 84; bytesDESKey[6] = 79; bytesDESKey[7] = 69; Array.Copy(Encoding.UTF8.GetBytes(strDESKey.PadRight(bytesDESKey.Length)), bytesDESKey, bytesDESKey.Length); Byte[] bytesDESIV = new Byte[8]; bytesDESIV = bytesDESKey; Array.Copy(Encoding.UTF8.GetBytes(strDESIV.PadRight(bytesDESIV.Length)), bytesDESIV, bytesDESIV.Length); //声明1个新的DES对象 DESCryptoServiceProvider desEncrypt = new DESCryptoServiceProvider(); desEncrypt.Mode = CipherMode.ECB; //desEncrypt.Padding = PaddingMode.Zeros; //开辟一块内存流 MemoryStream msEncrypt = new MemoryStream(); //把内存流对象包装成加密流对象 CryptoStream csEncrypt = new CryptoStream(msEncrypt, desEncrypt.CreateEncryptor(bytesDESKey, bytesDESIV), CryptoStreamMode.Write); byte[] inputByteArray = Encoding.UTF8.GetBytes(strPlain); csEncrypt.Write(inputByteArray, 0, inputByteArray.Length); csEncrypt.FlushFinalBlock(); return Convert.ToBase64String(msEncrypt.ToArray()); } #endregion #region MD5 /// <summary> /// MD5函数 /// </summary> /// <param name="str">原始字符串</param> /// <returns>MD5结果</returns> public static string MD5(string str) { if (string.IsNullOrEmpty(str)) return ""; byte[] b = Encoding.Default.GetBytes(str); b = new MD5CryptoServiceProvider().ComputeHash(b); StringBuilder ret = new StringBuilder(); for (int i = 0; i < b.Length; i++) ret.Append(b[i].ToString("x").PadLeft(2, '0')); return ret.ToString(); } public static string GMD5(string message) { Byte[] clearBytes = new UnicodeEncoding().GetBytes(message); Byte[] hashedBytes = ((HashAlgorithm)CryptoConfig.CreateFromName("MD5")).ComputeHash(clearBytes); String tt = BitConverter.ToString(hashedBytes).Replace("-", ""); // MessageBox.Show(tt.Length.ToString()); return tt; } public static string ToGB2312(string str) { string r = ""; System.Text.RegularExpressions.MatchCollection mc = System.Text.RegularExpressions.Regex.Matches(str, @"\\u([\w]{2})([\w]{2})", System.Text.RegularExpressions.RegexOptions.Compiled | System.Text.RegularExpressions.RegexOptions.IgnoreCase); byte[] bts = new byte[2]; foreach (System.Text.RegularExpressions.Match m in mc) { bts[0] = (byte)int.Parse(m.Groups[2].Value, System.Globalization.NumberStyles.HexNumber); bts[1] = (byte)int.Parse(m.Groups[1].Value, System.Globalization.NumberStyles.HexNumber); r += Encoding.Unicode.GetString(bts); } return r; }