#region DES加密解密 ///

/// DES加密 ///

/// 待加密字串 /// 32位Key值 /// 加密后的字符串 public string DESEncrypt(string strSource) { return DESEncrypt(strSource, DESKey); } public string DESEncrypt(string strSource, byte[] key) { SymmetricAlgorithm sa = Rijndael.Create(); sa.Key = key; sa.Mode = CipherMode.ECB; sa.Padding = PaddingMode.Zeros; MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, sa.CreateEncryptor(), CryptoStreamMode.Write); byte[] byt = Encoding.Unicode.GetBytes(strSource); cs.Write(byt, 0, byt.Length); cs.FlushFinalBlock(); cs.Close(); return Convert.ToBase64String(ms.ToArray()); } ///

/// DES解密 ///

/// 待解密的字串 /// 32位Key值 /// 解密后的字符串 public string DESDecrypt(string strSource) { return DESDecrypt(strSource, DESKey); } public string DESDecrypt(string strSource, byte[] key) { SymmetricAlgorithm sa = Rijndael.Create(); sa.Key = key; sa.Mode = CipherMode.ECB; sa.Padding = PaddingMode.Zeros; ICryptoTransform ct = sa.CreateDecryptor(); byte[] byt = Convert.FromBase64String(strSource); MemoryStream ms = new MemoryStream(byt); CryptoStream cs = new CryptoStream(ms, ct, CryptoStreamMode.Read); StreamReader sr = new StreamReader(cs, Encoding.Unicode); return sr.ReadToEnd(); }

解密字符串时偶尔出现错误数据错误：System.Security.Cryptography.CryptographicException

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