PHP での DES 暗号化と復号化のコード例

<?php
require_once(&#39;Des.php&#39;);
$des = new Des();
$data[&#39;a&#39;] = &#39;a&#39;;
$data[&#39;b&#39;] = &#39;b&#39;;
$conf = [&#39;appkey&#39;=>&#39;AbcdefghijklmnopqrstuvwX&#39;,&#39;secretcode&#39;=>&#39;Abcdefgh&#39;];
$encode = $des->encode($data, $conf);
print_r($encode);
echo "<br>";
$decode = $des->decode($encode,$conf);
print_r($decode);
?>

<?php

require_once(&#39;TripleDES.php&#39;);

class Des {

    public static function encode($data, $configKey) {
        $tripleDes = new TripleDES();
        if (is_array($data)) {
            $data = json_encode($data);
        }
        return $tripleDes->encode($data, $configKey["appkey"], $configKey["secretcode"]);
    }

    public static function decode($data, $configKey) {
        $tripleDes = new TripleDES();
        return $tripleDes->decode($data, $configKey["appkey"], $configKey["secretcode"]);
    }

    public static function encodeArr($data, $configKey) {
        $data = json_encode($data);
        return self::encode($data, $configKey);
    }

    public static function decodeArr($data, $configKey) {
        $res = self::decode($data, $configKey);
        return json_decode($res,true);
    }

}

<?php

class TripleDES {

    public static function genIvParameter() {
        return mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_TRIPLEDES, MCRYPT_MODE_CBC), MCRYPT_RAND);
    }

    private static function pkcs5Pad($text, $blocksize) {
        $pad = $blocksize - (strlen($text) % $blocksize); // in php, strlen returns the bytes of $text
        return $text . str_repeat(chr($pad), $pad);
    }

    private static 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);
    }

    public static function encryptText($plain_text, $key, $iv) {
        $padded = TripleDES::pkcs5Pad($plain_text, mcrypt_get_block_size(MCRYPT_TRIPLEDES, MCRYPT_MODE_CBC));
        return mcrypt_encrypt(MCRYPT_TRIPLEDES, $key, $padded, MCRYPT_MODE_CBC, $iv);
    }

    public static function decryptText($cipher_text, $key, $iv) {
        if(function_exists(&#39;mcrypt_decrypt&#39;)){
            $plain_text = mcrypt_decrypt(MCRYPT_TRIPLEDES, $key, $cipher_text, MCRYPT_MODE_CBC, $iv);
        }else{
            $plain_text = openssl_decrypt($cipher_text, &#39;DES-EDE3-CBC&#39;,$key, OPENSSL_NO_PADDING,$iv);
        }
        return TripleDES::pkcs5Unpad($plain_text);
    }

    public static function decode($cipher_text, $key, $iv) {
        $cipher_text = base64_decode($cipher_text);
        $cipher_text = TripleDES::decryptText($cipher_text, $key, $iv);
        return $cipher_text;
    }

    public static function encode($cipher_text, $key, $iv) {
        $cipher_text = TripleDES::encryptText($cipher_text, $key, $iv);
        return base64_encode($cipher_text);
    }

}