Asp.Net 文件加解密

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using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Security.Cryptography;using System.Text;using System.Threading.Tasks;namespace PD.Common{    public static class AES    {        #region 加密        #region 加密字符串        /// <summary>        /// 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)        /// </summary>        /// <param name="EncryptString">待加密密文</param>        /// <param name="EncryptKey">加密密钥</param>        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        /// <summary>        /// 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)        /// </summary>        /// <param name="EncryptString">待加密密文</param>        /// <param name="EncryptKey">加密密钥</param>        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        /// <summary>        /// 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)        /// </summary>        /// <param name="DecryptString">待解密密文</param>        /// <param name="DecryptKey">解密密钥</param>        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        /// <summary>        /// 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)        /// </summary>        /// <param name="DecryptString">待解密密文</param>        /// <param name="DecryptKey">解密密钥</param>        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    }}

using System;using System.Collections.Generic;using System.IO;using System.Linq;using System.Text;using System.Threading.Tasks;namespace PD.Common{   public class FileEncrypt    {        #region 变量        /// <summary>        /// 一次处理的明文字节数        /// </summary>        public static readonly int encryptSize = 10000000;        /// <summary>        /// 一次处理的密文字节数        /// </summary>        public static readonly int decryptSize = 10000016;        #endregion        #region 加密文件        /// <summary>        /// 加密文件        /// </summary>        public static void EncryptFile(string Inputpath, string Outputpath, string pwd)        {            try            {                if (File.Exists(Inputpath))                {                    using (FileStream fs = new FileStream(Inputpath, FileMode.Open, FileAccess.Read))                    {                        if (fs.Length > 0)                        {                            using (FileStream fsnew = new FileStream(Outputpath, FileMode.OpenOrCreate, FileAccess.Write))                            {                                //if (File.Exists(path + ".temp")) File.SetAttributes(path + ".temp", FileAttributes.Hidden);                                int blockCount = ((int)fs.Length - 1) / encryptSize + 1;                                for (int i = 0; i < blockCount; i++)                                {                                    int size = encryptSize;                                    if (i == blockCount - 1) size = (int)(fs.Length - i * encryptSize);                                    byte[] bArr = new byte[size];                                    fs.Read(bArr, 0, size);                                    byte[] result = AES.AESEncrypt(bArr, pwd);                                    fsnew.Write(result, 0, result.Length);                                    fsnew.Flush();                                }                                fsnew.Close();                                fsnew.Dispose();                            }                            fs.Close();                            fs.Dispose();                        }                    }                }            }            catch (Exception ex)            {                throw ex;            }        }        #endregion        #region 解密文件        /// <summary>        /// 解密文件        /// </summary>        public static void DecryptFile(string Inputpath, string Outputpath, string pwd)        {            try            {                if (File.Exists(Inputpath))                {                    using (FileStream fs = new FileStream(Inputpath, FileMode.Open, FileAccess.Read))                    {                        if (fs.Length > 0)                        {                            using (FileStream fsnew = new FileStream(Outputpath, FileMode.OpenOrCreate, FileAccess.Write))                            {                                int blockCount = ((int)fs.Length - 1) / decryptSize + 1;                                for (int i = 0; i < blockCount; i++)                                {                                    int size = decryptSize;                                    if (i == blockCount - 1) size = (int)(fs.Length - i * decryptSize);                                    byte[] bArr = new byte[size];                                    fs.Read(bArr, 0, size);                                    byte[] result = AES.AESDecrypt(bArr, pwd);                                    fsnew.Write(result, 0, result.Length);                                    fsnew.Flush();                                }                                fsnew.Close();                                fsnew.Dispose();                            }                            fs.Close();                            fs.Dispose();                        }                    }                }            }            catch (Exception ex)            {                throw ex;            }        }        #endregion    }}

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