HMAC SHA256的实现比较简单，可以用多种语言实现，下面我用C#语言实现，一种结果是居于BASE64,另外一种是居于64位。

C# HMAC SHA256 (Base64)

 

using System.Security.Cryptography;namespace Test{  public class MyHmac  {    private string CreateToken(string message, string secret)    {      secret = secret ?? "";      var encoding = new System.Text.ASCIIEncoding();      byte[] keyByte = encoding.GetBytes(secret);      byte[] messageBytes = encoding.GetBytes(message);      using (var hmacsha256 = new HMACSHA256(keyByte))      {        byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);        return Convert.ToBase64String(hashmessage);      }    }  }}

C# HMAC SHA256 (64位原始)

public static string Encrypt(string message, string secret)            {                secret = secret ?? "";                var encoding = new System.Text.UTF8Encoding();                byte[] keyByte = encoding.GetBytes(secret);                byte[] messageBytes = encoding.GetBytes(message);                using (var hmacsha256 = new HMACSHA256(keyByte))                {                    byte[] hashmessage = hmacsha256.ComputeHash(messageBytes);                    StringBuilder builder = new StringBuilder();                    for (int i = 0; i < hashmessage.Length; i++)                    {                        builder.Append(hashmessage[i].ToString("x2"));                    }                    return builder.ToString();                }            }

IOS客户端源码、API源码呈献给大家，完整的示例大家可以到AppStore下载安装“知音”