C#文件加密方法汇总

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace Utils
{
    ///

    /// AES加密解密
    ///

    public class AES
    {
        #region 加密
        #region 加密字符串
        ///

        /// AES 加密(高级加密标准，是下一代的加密算法标准，速度快，安全级别高，目前 AES 标准的一个实现是 Rijndael 算法)
        ///

        /// 待加密密文
        /// 加密密钥
        public static string AESEncrypt(string EncryptString, string EncryptKey)
        {
            return Convert.ToBase64String(AESEncrypt(Encoding.Default.GetBytes(EncryptString), EncryptKey));
        }
        #endregion

        #region 加密字节数组
        ///

        /// AES 加密(高级加密标准，是下一代的加密算法标准，速度快，安全级别高，目前 AES 标准的一个实现是 Rijndael 算法)
        ///

        /// 待加密密文
        /// 加密密钥
        public static byte[] AESEncrypt(byte[] EncryptByte, string EncryptKey)
        {
            if (EncryptByte.Length == 0) { throw (new Exception("明文不得为空")); }
            if (string.IsNullOrEmpty(EncryptKey)) { throw (new Exception("密钥不得为空")); }
            byte[] m_strEncrypt;
            byte[] m_btIV = Convert.FromBase64String("Rkb4jvUy/ye7Cd7k89QQgQ==");
            byte[] m_salt = Convert.FromBase64String("gsf4jvkyhye5/d7k8OrLgM==");
            Rijndael m_AESProvider = Rijndael.Create();
            try
            {
                MemoryStream m_stream = new MemoryStream();
                PasswordDeriveBytes pdb = new PasswordDeriveBytes(EncryptKey, m_salt);
                ICryptoTransform transform = m_AESProvider.CreateEncryptor(pdb.GetBytes(32), m_btIV);
                CryptoStream m_csstream = new CryptoStream(m_stream, transform, CryptoStreamMode.Write);
                m_csstream.Write(EncryptByte, 0, EncryptByte.Length);
                m_csstream.FlushFinalBlock();
                m_strEncrypt = m_stream.ToArray();
                m_stream.Close(); m_stream.Dispose();
                m_csstream.Close(); m_csstream.Dispose();
            }
            catch (IOException ex) { throw ex; }
            catch (CryptographicException ex) { throw ex; }
            catch (ArgumentException ex) { throw ex; }
            catch (Exception ex) { throw ex; }
            finally { m_AESProvider.Clear(); }
            return m_strEncrypt;
        }
        #endregion
        #endregion

        #region 解密
        #region 解密字符串
        ///

        /// AES 解密(高级加密标准，是下一代的加密算法标准，速度快，安全级别高，目前 AES 标准的一个实现是 Rijndael 算法)
        ///

        /// 待解密密文
        /// 解密密钥
        public static string AESDecrypt(string DecryptString, string DecryptKey)
        {
            return Convert.ToBase64String(AESDecrypt(Encoding.Default.GetBytes(DecryptString), DecryptKey));
        }
        #endregion

        #region 解密字节数组
        ///

        /// AES 解密(高级加密标准，是下一代的加密算法标准，速度快，安全级别高，目前 AES 标准的一个实现是 Rijndael 算法)
        ///

        /// 待解密密文
        /// 解密密钥
        public static byte[] AESDecrypt(byte[] DecryptByte, string DecryptKey)
        {
            if (DecryptByte.Length == 0) { throw (new Exception("密文不得为空")); }
            if (string.IsNullOrEmpty(DecryptKey)) { throw (new Exception("密钥不得为空")); }
            byte[] m_strDecrypt;
            byte[] m_btIV = Convert.FromBase64String("Rkb4jvUy/ye7Cd7k89QQgQ==");
            byte[] m_salt = Convert.FromBase64String("gsf4jvkyhye5/d7k8OrLgM==");
            Rijndael m_AESProvider = Rijndael.Create();
            try
            {
                MemoryStream m_stream = new MemoryStream();
                PasswordDeriveBytes pdb = new PasswordDeriveBytes(DecryptKey, m_salt);
                ICryptoTransform transform = m_AESProvider.CreateDecryptor(pdb.GetBytes(32), m_btIV);
                CryptoStream m_csstream = new CryptoStream(m_stream, transform, CryptoStreamMode.Write);
                m_csstream.Write(DecryptByte, 0, DecryptByte.Length);
                m_csstream.FlushFinalBlock();
                m_strDecrypt = m_stream.ToArray();
                m_stream.Close(); m_stream.Dispose();
                m_csstream.Close(); m_csstream.Dispose();
            }
            catch (IOException ex) { throw ex; }
            catch (CryptographicException ex) { throw ex; }
            catch (ArgumentException ex) { throw ex; }
            catch (Exception ex) { throw ex; }
            finally { m_AESProvider.Clear(); }
            return m_strDecrypt;
        }
        #endregion
        #endregion

    }
}