老师布置期末要做一个维吉尼亚密码的加密和解密程序,话说我C#、JAVA啊什么得都不会,只会PHP和PYTHON。
压根不知道什么叫维吉尼亚算法,上网查了下,加密的算法蛮简单的,思路很清晰。于是用PHP写了个PHP版的维吉尼亚的加密算法。
<?php
//coder:Jiangbin
//date:2011-11-25
/*****************************************
凯撒密码表
ABCDEFGHIJKLMNOPQRSTUVWXYZ
BCDEFGHIJKLMNOPQRSTUVWXYZA
CDEFGHIJKLMNOPQRSTUVWXYZAB
DEFGHIJKLMNOPQRSTUVWXYZABC
EFGHIJKLMNOPQRSTUVWXYZABCD
FGHIJKLMNOPQRSTUVWXYZABCDE
GHIJKLMNOPQRSTUVWXYZABCDEF
HIJKLMNOPQRSTUVWXYZABCDEFG
IJKLMNOPQRSTUVWXYZABCDEFGH
JKLMNOPQRSTUVWXYZABCDEFGHI
KLMNOPQRSTUVWXYZABCDEFGHIJ
LMNOPQRSTUVWXYZABCDEFGHIJK
MNOPQRSTUVWXYZABCDEFGHIJKL
NOPQRSTUVWXYZABCDEFGHIJKLM
OPQRSTUVWXYZABCDEFGHIJKLMN
PQRSTUVWXYZABCDEFGHIJKLMNO
QRSTUVWXYZABCDEFGHIJKLMNOP
RSTUVWXYZABCDEFGHIJKLMNOPQ
STUVWXYZABCDEFGHIJKLMNOPQR
TUVWXYZABCDEFGHIJKLMNOPQRS
UVWXYZABCDEFGHIJKLMNOPQRST
VWXYZABCDEFGHIJKLMNOPQRSTU
WXYZABCDEFGHIJKLMNOPQRSTUV
XYZABCDEFGHIJKLMNOPQRSTUVW
YZABCDEFGHIJKLMNOPQRSTUVWX
ZABCDEFGHIJKLMNOPQRSTUVWXY
******************************************/
echo '<pre>';
$mkey = 'Jiangbin'; //密钥
$mstr = 'I known what love is because of you'; //原文
$nkey = strtoupper($mkey); //转成大写
$nstr = strtoupper($mstr); //转成大写(明文)
$nstr = str_replace(chr(32),'',$nstr); //去空格
$key = str_split($nkey); //密钥转换成数组
$str = str_split($nstr); //明文转换成数组
$keylen = count($key); //获取密钥长度
$strlen = count($str); //获取去空格后的明文长度
$arr = array();
for( $i = 0; $i < $strlen; $i++) {
$arr[$i] = chr(((ord($str[$i])-65) + (ord($key[$i%$keylen])-65))%26+65);
}
echo '密钥:'.$mkey."<br />";
echo '原文:'.$mstr."<br />";
echo '明文:'.$nstr."<br />";
echo '密文:'.implode("",$arr);
echo '</pre>';
?>