RSA解密提示“不正确的散列算法”


/// <summary>
        /// 对原始数据进行MD5加密
        /// </summary>
        /// <param name="key">待加密的注册码</param>
        /// <returns>加密后的注册码</returns>
        public static string GetMD5(string key)
        {
            HashAlgorithm algorithm = HashAlgorithm.Create("MD5");
            byte[] bytes = Encoding.GetEncoding("GB2312").GetBytes(key);
            byte[] inArray = algorithm.ComputeHash(bytes);
            string strEncrypt = Convert.ToBase64String(inArray);
            return strEncrypt;        }/// <summary>
        /// 使用私钥加密客户注册码[注册码+GUID码]
        /// </summary>
        /// <param name="key">客户注册码[注册码+GUID码]</param>
        /// <param name="keyContainerName">密钥容器名称</param>
        /// <param name="keyPath">私钥文件地址</param>
        /// <returns>加密后的注册码</returns>
        public static string EncryptKey(string key,string keyContainerName, string keyPath)
        {
            CspParameters cspParameter = new CspParameters();
            StreamReader sr = new StreamReader(keyPath);
            cspParameter.KeyContainerName = keyContainerName;
            string strKey = sr.ReadLine();
            string strEncrypt = string.Empty;
            byte[] byteKeys = Convert.FromBase64String(GetMD5(key));            RSACryptoServiceProvider provider = new RSACryptoServiceProvider(cspParameter);
            provider.FromXmlString(strKey);
            RSAPKCS1SignatureFormatter formatter = new RSAPKCS1SignatureFormatter(provider);
            formatter.SetHashAlgorithm("MD5");
            byte[] byteEncrypt = formatter.CreateSignature(byteKeys);
            strEncrypt = Convert.ToBase64String(byteEncrypt);
            return strEncrypt;
        }        /// <summary>
        /// 使用公钥解密客户注册码验证
        /// </summary>
        /// <param name="publicKey">公钥</param>
        /// <param name="key">授权文件信息</param>
        /// <param name="computeInfo">电脑硬件信息</param>
        public static bool Decrypt(string publicKey,string key,string computeInfo)
        {
            try
            {
                CspParameters cspParameter = new CspParameters();
                cspParameter.KeyContainerName = "public";
                RSACryptoServiceProvider provider = new RSACryptoServiceProvider(cspParameter);
                provider.FromXmlString(publicKey);
                RSAPKCS1SignatureDeformatter deformatter = new RSAPKCS1SignatureDeformatter(provider);
                deformatter.SetHashAlgorithm("MD5");                //转换授权文件信息字符串
                byte[] byteAuthorization = Convert.FromBase64String(key);
                //转换当前电脑硬件信息
                byte[] byteComputeInfo = Convert.FromBase64String(GetMD5(computeInfo));
                if (deformatter.VerifySignature(byteAuthorization, byteComputeInfo))
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                WriteSystemLog(5, 3, "000000", ex.Message);
                throw new Exception(ex.Message, ex);
            }
        }
执行以上代码之后提示“不正确的散列算法”，请问是代码哪里出了问题？急