PHP AES加密实现案例

最新推荐文章于 2024-01-13 09:14:43 发布

转载最新推荐文章于 2024-01-13 09:14:43 发布 · 375 阅读

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#PHP #AES #加密

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博客介绍了PHP实现AES加密的使用方法，重点围绕PHP代码展开，为开发者提供了在PHP环境下运用AES加密技术的相关指引。

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使用方法：

$aes = new Crypt();// 把加密后的字符串按十六进制进行存储
$encode = “4323453fsdf”;// 被加密的字符串
$ct = $aes->encrypt($encode);
echo "encode = ".$ct."<br>";
$cpt = $aes->decrypt($ct);
echo "decode = ".$cpt;

PHP代码：

<?php

class Crypt {

    /**
     * [$cipher 加密模式]
     * @var [type]
     */
    private $cipher = MCRYPT_RIJNDAEL_128;
    private $mode = MCRYPT_MODE_CBC;

    /**
     * [$key 密匙]
     * @var string
     */
    private $secret_key = '153453532534';
    /**
     * [$iv 偏移量]
     * @var string
     */
    private $iv = '0102030405060708';

    function setCipher($cipher=''){
        $cipher && $this->cipher = $cipher;
    }

    function setMode($mode=''){
        $mode && $this->mode = $mode;
    }

    function setSecretKey($secret_key=''){
        $secret_key && $this->secret_key = $secret_key;
    }

    function setIv($iv=''){
        $iv && $this->iv = $iv;
    }

    //加密
    function encrypt($str)
    {       
        $size = mcrypt_get_block_size ( MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC );
        $str = $this->pkcs5Pad ( $str, $size );

        $data=mcrypt_cbc(MCRYPT_RIJNDAEL_128, $this->secret_key, $str, MCRYPT_ENCRYPT, $this->iv);

        //bin2hex() 函数把 ASCII 字符的字符串转换为十六进制值
        $data=strtolower(bin2hex($data));
        return $data;
    }

    //解密
    function decrypt($str)
    {
        $str = $this->hex2bin( strtolower($str));
        $str = mcrypt_cbc(MCRYPT_RIJNDAEL_128, $this->secret_key, $str, MCRYPT_DECRYPT, $this->iv );
        $str = $this->pkcs5Unpad( $str );
        return $str;
    }

    //bin2hex还原
    private function hex2bin($hexData)
    {
        $binData = "";
        for($i = 0; $i < strlen ( $hexData ); $i += 2)
        {
            $binData .= chr(hexdec(substr($hexData, $i, 2)));
        }
        return $binData;
    }

    //PKCS5Padding
    private function pkcs5Pad($text, $blocksize)
    {
        $pad = $blocksize - (strlen ( $text ) % $blocksize);
        return $text . str_repeat ( chr ( $pad ), $pad );
    }

    private function pkcs5Unpad($text)
    {
        $pad = ord ( $text {strlen ( $text ) - 1} );
        if ($pad > strlen ( $text ))
            return false;
        if (strspn ( $text, chr ( $pad ), strlen ( $text ) - $pad ) != $pad)
            return false;
        return substr ( $text, 0, - 1 * $pad );
    }

}
?>