DTcms.API/DTcms.API.Payment.alipaymb/AlipayMD5.cs

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using System;
using System.Security.Cryptography;
using System.Text;

namespace DTcms.API.Payment.alipaymb
{
	public sealed class AlipayMD5
	{
		public static string Sign(string prestr, string key, string _input_charset)
		{
			System.Text.StringBuilder sb = new System.Text.StringBuilder(32);
			prestr += key;
			System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
			byte[] t = md5.ComputeHash(System.Text.Encoding.GetEncoding(_input_charset).GetBytes(prestr));
			for (int i = 0; i < t.Length; i++)
			{
				sb.Append(t[i].ToString("x").PadLeft(2, '0'));
			}
			return sb.ToString();
		}

		public static bool Verify(string prestr, string sign, string key, string _input_charset)
		{
			string mysign = AlipayMD5.Sign(prestr, key, _input_charset);
			return mysign == sign;
		}
	}
}