80 lines
2.0 KiB
C#
80 lines
2.0 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Web;
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using System.Text;
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namespace Education
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{
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public class EncDec
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{
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/// <summary>
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/// WLIB 新版密碼的加密函數
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/// </summary>
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/// <param name="S">欲加密之密碼字串，最大長度 8 位，僅可包含A-Z、a-z、0-9</param>
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/// <returns>加密後之密碼字串</returns>
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public static string KeyEnc(string S)
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{
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int k1 = 0;
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int k2 = 0;
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int i, j;
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Random rnd = new Random(DateTime.UtcNow.AddHours(8).Millisecond);
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byte[] inBuf = new byte[8];
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byte[] outBuf = new byte[10];
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string tmp;
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while (true)
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{
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k1 = rnd.Next(31);
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k2 = rnd.Next(31);
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outBuf[0] = (byte)(k1 + 44);
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outBuf[9] = (byte)(k2 + 66);
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if (S.Length < 8)
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inBuf = Encoding.ASCII.GetBytes(S.PadRight(8));
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else
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inBuf = Encoding.ASCII.GetBytes(S);
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for (i = 1; i <= 8; i++)
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{
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j = (k1 % 31) + i;
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j = ((k2 + j) % 31) + 1;
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outBuf[i] = (byte)(inBuf[i - 1] ^ j);
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}
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tmp = Encoding.ASCII.GetString(outBuf);
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if (tmp.IndexOf('\'') < 0 && tmp.IndexOf('"') < 0)
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break;
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}
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return tmp;
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}
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/// <summary>
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/// WLIB 新版密碼的解密函數
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/// </summary>
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/// <param name="S">欲解密之密碼字串，固定 10 位</param>
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/// <returns>解密後之密碼字串。若參數 S 長度不是 10 位，則傳回".." + S + ".."</returns>
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public static string KeyDec(string S)
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{
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int i, j;
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int Key1, Key2;
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byte[] inBuf;
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byte[] outBuf = new byte[8];
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if (S.Length != 10)
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return ".." + S + "..";
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//解密
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inBuf = Encoding.ASCII.GetBytes(S);
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Key1 = inBuf[0] - 44;
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Key2 = inBuf[9] - 66;
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for (i = 1; i <= 8; i++)
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{
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j = Key1 % 31 + i;
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j = (Key2 + j) % 31 + 1;
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outBuf[i - 1] = (byte)(inBuf[i] ^ j);
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}
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return Encoding.ASCII.GetString(outBuf).Trim();
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}
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}
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} |