PHP加密算法整理

<?php
// +----------------------------------------------------------------------+
// | Wiki Framework |
// +----------------------------------------------------------------------+
// $string 明文 或 密文 必填
// $isEncrypt 是否加密 可选，默认为加密
// $key 密匙 可选，默认为空格
// $b = gncrypt($a,TRUE,'123');
// $c = gncrypt($b,false,'123');
// 采用SHA1生成密匙簿，超过300个字符使用ZLIB压缩
function gncrypt($string, $isEncrypt = true, $key = KEY_SPACE) {
    if (!isset($string{0}) || !isset($key{0})) {
        return false;
    }
    $dynKey = $isEncrypt ? sha1(microtime(true)) : substr($string, 0, 40);
    //$fixedKey = hash('sha1', $key);
    $fixedKey = sha1($key);
    $dynKeyPart1 = substr($dynKey, 0, 20);
    $dynKeyPart2 = substr($dynKey, 20);
    $fixedKeyPart1 = substr($fixedKey, 0, 20);
    $fixedKeyPart2 = substr($fixedKey, 20);
    $key = sha1($dynKeyPart1 . $fixedKeyPart1 . $dynKeyPart2 . $fixedKeyPart2);
    $string = $isEncrypt ? $fixedKeyPart1 . $string . $dynKeyPart2 : (isset($string{339}) ? gzuncompress(base64_decode(substr($string, 40))) : base64_decode(substr($string, 40)));
    $n = 0;
    $result = '';
    $len = strlen($string);
    for ($n = 0; $n < $len; $n++) {
        $result .= chr(ord($string{$n}) ^ ord($key{$n % 40}));
    }
    return $isEncrypt ? $dynKey . str_replace('=', '', base64_encode($n > 299 ? gzcompress($result) : $result)) : substr($result, 20, -20);
}

$h = "hello world";
$a = gncrypt($h, true, "123");
echo $a."\n";
$b = gncrypt($a, false, "123");
echo $b."\b";

===========================================================================================

<?php

/*/
# 函数功能：加密/解密
# 函数名称：zxingcrypt
# 参数表 ：string date 要加密和解密的数据,$key 密钥,【, string mode = 'encode' 默认为加密 - 'decode'为解密】
# 返回值 ：string
# 更新时间：Thu Mar 06 08:30:46 CST 2008
/*/
function gncrypt($data,$key='greenet',$mode = 'encode')
{
    $key = md5($key);//用MD5哈希生成一个密钥，注意加密和解密的密钥必须统一
    if ($mode == 'decode'){
       $data = base64_decode($data);
    }
    if (function_exists('mcrypt_create_iv')){
       $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
       $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    }
    if (isset($iv) && $mode == 'encode'){
       $passcrypt = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $data, MCRYPT_MODE_ECB, $iv);
    }elseif (isset($iv) && $mode == 'decode'){
       $passcrypt = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $data, MCRYPT_MODE_ECB, $iv);
    }
    if ($mode == 'encode'){
       $passcrypt = base64_encode($passcrypt);
    }
    return $passcrypt;
}

$encodestr = gncrypt('helloworld');
echo "base64=".base64_encode($encodestr)."";
echo "string after encode=".$encodestr."";
$decodestr = gncrypt($encodestr,'greenet','decode');
echo "decrypt string=".$decodestr."";