C#简单的加密类

1.加密

 public class EncryptHepler {
         // 验值
         static string saltValue = "XXXX";
         // 密码值
         static string pwdValue = "XXXX";

         /// <summary>
         /// 加密
         /// </summary>
         public static string Encrypt( string input ) {
             byte[ ] data = System.Text.UTF8Encoding.UTF8.GetBytes( input );
             byte[ ] salt = System.Text.UTF8Encoding.UTF8.GetBytes( saltValue );

             // AesManaged - 高级加密标准(AES) 对称算法的管理类
             System.Security.Cryptography.AesManaged aes = new System.Security.Cryptography.AesManaged( );
             // Rfc2898DeriveBytes - 通过使用基于 HMACSHA1 的伪随机数生成器，实现基于密码的密钥派生功能 (PBKDF2 - 一种基于密码的密钥派生函数)
             // 通过 密码 和 salt 派生密钥
             System.Security.Cryptography.Rfc2898DeriveBytes rfc = new System.Security.Cryptography.Rfc2898DeriveBytes( pwdValue, salt );

             aes.BlockSize = aes.LegalBlockSizes[].MaxSize;
             aes.KeySize = aes.LegalKeySizes[].MaxSize;
             aes.Key = rfc.GetBytes( aes.KeySize /  );
             aes.IV = rfc.GetBytes( aes.BlockSize /  );

             // 用当前的 Key 属性和初始化向量 IV 创建对称加密器对象
             System.Security.Cryptography.ICryptoTransform encryptTransform = aes.CreateEncryptor( );
             // 加密后的输出流
             System.IO.MemoryStream encryptStream = new System.IO.MemoryStream( );
             // 将加密后的目标流（encryptStream）与加密转换（encryptTransform）相连接
             System.Security.Cryptography.CryptoStream encryptor = new System.Security.Cryptography.CryptoStream
                 ( encryptStream, encryptTransform, System.Security.Cryptography.CryptoStreamMode.Write );

             // 将一个字节序列写入当前 CryptoStream （完成加密的过程）
             encryptor.Write( data, , data.Length );
             encryptor.Close( );
             // 将加密后所得到的流转换成字节数组，再用Base64编码将其转换为字符串
             string encryptedString = Convert.ToBase64String( encryptStream.ToArray( ) );
             return encryptedString;
         }

2.解密

 /// <summary>
         /// 解密
         /// </summary>
         public static string Decrypt( string input ) {
             byte[ ] encryptBytes = Convert.FromBase64String( input );
             byte[ ] salt = Encoding.UTF8.GetBytes( saltValue );
             System.Security.Cryptography.AesManaged aes = new System.Security.Cryptography.AesManaged( );
             System.Security.Cryptography.Rfc2898DeriveBytes rfc = new System.Security.Cryptography.Rfc2898DeriveBytes( pwdValue, salt );

             aes.BlockSize = aes.LegalBlockSizes[].MaxSize;
             aes.KeySize = aes.LegalKeySizes[].MaxSize;
             aes.Key = rfc.GetBytes( aes.KeySize /  );
             aes.IV = rfc.GetBytes( aes.BlockSize /  );

             // 用当前的 Key 属性和初始化向量 IV 创建对称解密器对象
             System.Security.Cryptography.ICryptoTransform decryptTransform = aes.CreateDecryptor( );
             // 解密后的输出流
             System.IO.MemoryStream decryptStream = new System.IO.MemoryStream( );

             // 将解密后的目标流（decryptStream）与解密转换（decryptTransform）相连接
             System.Security.Cryptography.CryptoStream decryptor = new System.Security.Cryptography.CryptoStream(
                 decryptStream, decryptTransform, System.Security.Cryptography.CryptoStreamMode.Write );
             // 将一个字节序列写入当前 CryptoStream （完成解密的过程）
             decryptor.Write( encryptBytes, , encryptBytes.Length );
             decryptor.Close( );

             // 将解密后所得到的流转换为字符串
             byte[ ] decryptBytes = decryptStream.ToArray( );
             string decryptedString = UTF8Encoding.UTF8.GetString( decryptBytes, , decryptBytes.Length );
             return decryptedString;
         }
     }//class end