HMACSHA256编码

HMACSHA256编码：

private static string GeneratePrivateKey(string secret, string orignalStr)
{
    try
    {
        if (string.IsNullOrEmpty(secret))
            throw new ArgumentException("密钥不能为空！");

        using (var hmacsha256 = new HMACSHA256(Encoding.UTF8.GetBytes(secret)))
        {
            byte[] hashmessage = hmacsha256.ComputeHash(Encoding.UTF8.GetBytes(orignalStr));
            return HttpUtility.UrlEncode(Convert.ToBase64String(hashmessage), Encoding.UTF8);
        }
    }
    catch (Exception e)
    {
        throw new Exception(e.Message, e);
    }
}