HMAC SHA512签名_hmacsha512 验证签名

        /// <summary>
        /// HMAC SHA512签名
        /// </summary>
        /// <param name="plainStr">明文</param>
        /// <param name="key">秘钥</param>
        /// <returns>密文</returns>
        public static string HMACSHA512Encrypt(string plainStr, string key)
        {
            string keyToBase64 = Convert.ToBase64String(Encoding.UTF8.GetBytes(key));
            HMACSHA512 hMAC = new HMACSHA512(Encoding.UTF8.GetBytes(keyToBase64));
            byte[] hashBytes = hMAC.ComputeHash(Encoding.UTF8.GetBytes(plainStr));
            return string.Concat(BitConverter.ToString(hashBytes).Split('-')).ToLower();
        }
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