字符串生成及加密

<?php
namespace actionstrlib;

class basicAction extends action
{
    // 数值型字符串，代号 1
    private $cs1 = array('0','1','2','3','4','5','6','7','8','9');
    // 纯小写字符串，代号 2
    private $cs2 = array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z');
    // 多类型字符串，代号 3
    private $cs3 = array
    (
        '0','1','2','3','4','5','6','7','8','9',
        'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
        'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'
    );
    
    public function randstr($len,$type=1)
    {
        if( $len<1 ) return false;
        $RET = '';
        switch( $type )
        {
            case 1:
                $RET = $RET.$this->randcs1(false);
                for( $i=2; $i<=$len; $i++ ) $RET = $RET.$this->randcs1();
                return $RET;
            case 2:
                for( $i=1; $i<=$len; $i++ ) $RET = $RET.$this->cs2[rand(0,25)];
                return $RET;
            case 3:
                $RET = $RET.$this->randcs3(false);
                for( $i=2; $i<=$len; $i++ ) $RET = $RET.$this->randcs3();
                return $RET;
            default:
                return false;
        }
    }
    
    private function randcs1($zero=true)
    {
        $from = 1;
        if( $zero ) $from = 0;
        return $this->cs1[rand($from,9)];
    }
    
    private function randcs3($zero=true)
    {
        $from = 1;
        if( $zero ) $from = 0;
        return $this->cs3[rand($from,61)];
    }
    
    public function adpassword($password){
        $a=range('A','Z');
        $b=range('a','z');
        $c=range(0,9);
        $a=implode('',$a);
        $b=implode('',$b);
        $c=implode('',$c);
        $res=$a.$b.$c;//生成随机字符串的源字符串
        $str='';//初始化一个空的字符串
        for($i=1;$i<=32;$i++){
            $tmp=str_shuffle($res);
            $str.=$tmp[0];
        }
        //$str 为我们生成的随机密码
        $result_str=md5($password.$str);
        $data=array(
            'password'=>$result_str,
            'salt'=>$str
            );
        return $data;
    }

    //可逆加密  key  密钥
    /** $data = 'orderid=11';    // 被加密信息
        $key = '3n4w';    // 密钥
        $encrypt = A('strlib/basic/encrypt',array($data, $key));
        $decrypt = A('strlib/basic/decrypt',array($encrypt, $key));
        echo $encrypt, "
", $decrypt;
    **/
    public function encrypt($data, $key)
    {
        $key    =    md5($key);
        $x        =    0;
        $len    =    strlen($data);
        $l        =    strlen($key);
        $char = $str = '';
        for ($i = 0; $i < $len; $i++)
        {
            if ($x == $l)
            {
                $x = 0;
            }
            $char .= $key{$x};
            $x++;
        }
        for ($i = 0; $i < $len; $i++)
        {
            $str .= chr(ord($data{$i}) + (ord($char{$i})) % 256);
        }
        return base64_encode($str);
    }

    public function decrypt($data, $key)
    {
        $key = md5($key);
        $x = 0;
        $data = base64_decode($data);
        $len = strlen($data);
        $l = strlen($key);
        $char = $str = '';
        for ($i = 0; $i < $len; $i++)
        {
            if ($x == $l)
            {
                $x = 0;
            }
            $char .= substr($key, $x, 1);
            $x++;
        }
        for ($i = 0; $i < $len; $i++)
        {
            if (ord(substr($data, $i, 1)) < ord(substr($char, $i, 1)))
            {
                $str .= chr((ord(substr($data, $i, 1)) + 256) - ord(substr($char, $i, 1)));
            }
            else
            {
                $str .= chr(ord(substr($data, $i, 1)) - ord(substr($char, $i, 1)));
            }
        }
        return $str;
    }
}




?>