文件File加密解密

    /// <summary>
    /// 文件操作帮助类,提供文件加密、解密
    /// </summary>
    public class FileHelper
    {

        //public const string fileEncrityKey = "dbe06967-669d-41dbe06967-669d-41";
        public const string fileEncrityKey = "ihlih*0037JOHT*)(PIJY*(()JI^)IO%";


        /// <summary>
        /// 加密
        /// </summary>
        /// <param name="docPath">要加密的文件路径</param>
        /// <param name="destPath">加密后的文件路径</param>
        /// <param name="strKey">秘钥</param>
        public static void Encrypt(string docPath, string destPath, string strKey)
        {
            //分组加密算法
            using (var fs = new FileStream(docPath, FileMode.Open))
            {
                var buffer = new byte[fs.Length];
                fs.Read(buffer, 0, buffer.Length);//得到需要加密的字节数组    
                //设置密钥,密钥向量，两个一样，都是16个byte
                var rDel = new RijndaelManaged();
                var key = Encoding.UTF8.GetBytes(strKey);
                rDel.Key = key;
                rDel.Mode = CipherMode.ECB;
                rDel.Padding = PaddingMode.PKCS7;
                ICryptoTransform cTransform = rDel.CreateEncryptor();
                byte[] cipherBytes = cTransform.TransformFinalBlock(buffer, 0, buffer.Length);
                var fsEncrypt = new FileStream(destPath, FileMode.Create, FileAccess.Write);
                fsEncrypt.Write(cipherBytes, 0, cipherBytes.Length);
            }
        }

        //解密，fileIn:解密的文件路径，fileOut:解密后的文件存放路径,strKey:秘钥
        public static void Decrypt(string fileIn, string fileOut, string strKey)
        {
            var fsIn = new FileStream(fileIn, FileMode.Open, FileAccess.Read);
            var fsOut = new FileStream(fileOut, FileMode.OpenOrCreate, FileAccess.Write);
            var rDel = new RijndaelManaged();
            var key = Encoding.UTF8.GetBytes(strKey);
            rDel.Key = key;
            rDel.Mode = CipherMode.ECB;
            rDel.Padding = PaddingMode.PKCS7;
            var cs = new CryptoStream(fsOut, rDel.CreateDecryptor(), CryptoStreamMode.Write);
            var bufferLen = 4096;
            var buffer = new byte[bufferLen];
            int bytesRead;
            do
            {
                bytesRead = fsIn.Read(buffer, 0, bufferLen);
                cs.Write(buffer, 0, bytesRead);
            } while (bytesRead != 0);
            cs.Close();
            fsIn.Close();
            fsIn.Dispose();
            fsOut.Dispose();
        }
    }