文件 md5 sha1 加密

文件加密

     /// <summary>
        /// 获取文件的MD5码
        /// </summary>
        /// <param name="fileName">传入的文件名（含路径及后缀名）</param>
        /// <returns></returns>
        public static string GetMD5HashFromFile( string fileName)
        {
            try
            {
                using (var file = new FileStream(fileName, System.IO.FileMode.Open))
                {
                    MD5 md5 = new MD5CryptoServiceProvider();
                    byte[] retVal = md5.ComputeHash(file);
                    StringBuilder sb = new StringBuilder();
                    for (int i = 0; i < retVal.Length; i++)
                    {
                        sb.Append(retVal[i].ToString("x2"));//加密结果"x2"结果为32位,"x3"结果为48位,"x4"结果为64位

                    }

                    return sb.ToString();
                }
               
            }
            catch (Exception ex)
            {
                throw new Exception("GetMD5HashFromFile() fail,error:" + ex.Message);
            }
        }

        public static string GetSha1HashFromFile(string fileName)
        {
            try
            {
                using (var file = new FileStream(fileName, System.IO.FileMode.Open))
                {
                    SHA1 sha = new SHA1CryptoServiceProvider();
                    byte[] retVal = sha.ComputeHash(file);
                    StringBuilder sb = new StringBuilder();
                    for (int i = 0; i < retVal.Length; i++)
                    {
                        sb.Append(retVal[i].ToString("x2"));//加密结果"x2"结果为40位,"x3"结果为60位,"x4"结果为80位

                    }

                    return sb.ToString();
                }

            }
            catch (Exception ex)
            {
                throw new Exception("GetMD5HashFromFile() fail,error:" + ex.Message);
            }
        }