C#编程

开发平台：
C#

CryptoHelper.cs：源码内容
							﻿using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
public class CryptoHelper
{
    /// <summary>
    /// 复合 Hash：string --> byte[] --> hashed byte[] --> base64 string
    /// </summary>
    /// <param name="s"></param>
    /// <returns></returns>
    public static string ComputeHashString(string s)
    {
        return ToBase64String(ComputeHash(ConvertStringToByteArray(s)));
    }
    public static byte[] ComputeHash(byte[] buf)
    {
        //return ((HashAlgorithm)CryptoConfig.CreateFromName("SHA1")).ComputeHash(buf);
        return SHA1.Create().ComputeHash(buf);
    }
    /// <summary>
    /// //System.Convert.ToBase64String
    /// </summary>
    /// <param name="buf"></param>
    /// <returns></returns>
    public static string ToBase64String(byte[] buf)
    {
        return System.Convert.ToBase64String(buf);
    }
    public static byte[] FromBase64String(string s)
    {
        return System.Convert.FromBase64String(s);
    }
    /// <summary>
    /// //Encoding.UTF8.GetBytes(s)
    /// </summary>
    /// <param name="s"></param>
    /// <returns></returns>
    public static byte[] ConvertStringToByteArray(String s)
    {
        return Encoding.UTF8.GetBytes(s);//gb2312
    }
    public static string ConvertByteArrayToString(byte[] buf)
    {
        //return System.Text.Encoding.GetEncoding("utf-8").GetString(buf);
        return Encoding.UTF8.GetString(buf);
    }
    /// <summary>
    /// 字节数组转换为十六进制字符串
    /// </summary>
    /// <param name="buf"></param>
    /// <returns></returns>
    public static string ByteArrayToHexString(byte[] buf)
    {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < buf.Length; i++)
        {
            sb.Append(buf[i].ToString("X").Length == 2 ? buf[i].ToString("X") : "0" + buf[i].ToString("X"));
        }
        return sb.ToString();
    }
    /// <summary>
    /// 十六进制字符串转换为字节数组
    /// </summary>
    /// <param name="s"></param>
    /// <returns></returns>
    public static byte[] HexStringToByteArray(string s)
    {
        Byte[] buf = new byte[s.Length / 2];
        for (int i = 0; i < buf.Length; i++)
        {
            buf[i] = (byte)(Char2Hex(s.Substring(i * 2, 1)) * 0x10 + Char2Hex(s.Substring(i * 2 + 1, 1)));
        }
        return buf;
    }
    private static byte Char2Hex(string chr)
    {
        switch (chr)
        {
            case "0":
                return 0x00;
            case "1":
                return 0x01;
            case "2":
                return 0x02;
            case "3":
                return 0x03;
            case "4":
                return 0x04;
            case "5":
                return 0x05;
            case "6":
                return 0x06;
            case "7":
                return 0x07;
            case "8":
                return 0x08;
            case "9":
                return 0x09;
            case "A":
                return 0x0a;
            case "B":
                return 0x0b;
            case "C":
                return 0x0c;
            case "D":
                return 0x0d;
            case "E":
                return 0x0e;
            case "F":
                return 0x0f;
        }
        return 0x00;
    }
}

						