Asp.Net 实现SHA1加密

using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;

namespace WebToolkit.Encrypt
{
    public class SHA1Helper
    {
        /// <summary>
        /// Net实现Sha1加密算法
        /// </summary>
        /// <param name="str">要加密的字符串,默认编码为UTF-8</param>
        /// <returns>加密后的十六进制的哈希散列（字符串）</returns>
        public static string Sha1Signature(string str)
        {
            return Sha1Signature(str, Encoding.UTF8);
        }

        public static string Sha1Signature(string str, Encoding encoding)
        {
            var buffer = encoding.GetBytes(str);
            var data = SHA1.Create().ComputeHash(buffer);
            StringBuilder sub = new StringBuilder();
            foreach (var t in data)
            {
                sub.Append(t.ToString("X2"));
            }

            return sub.ToString();
        }
    }
}