AES

AES.php

<?php

namespace NCFGroup\Common\Library;

/**
 * AES对称加密封装 (包括base64)
 * 算法: AES128位
 * 模式: ECB
 * 填充: PKCS5Padding
 */
class AesLib
{

    /**
     * 加密 (Aes + base64)
     */
    public static function encode($input, $key)
    {
        $size = mcrypt_get_block_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_ECB);
        $input = self::pkcs5Padding($input, $size);

        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_ECB, '');
        $iv = mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
        mcrypt_generic_init($td, $key, $iv);
        $data = mcrypt_generic($td, $input);
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);
        $data = base64_encode($data);

        return $data;
    }

    /**
     * PKCS5方式填充
     */
    private static function pkcs5Padding($text, $blocksize)
    {
        $pad = $blocksize - (strlen($text) % $blocksize);
        return $text.str_repeat(chr($pad), $pad);
    }

    /**
     * 解密 (base64 + Aes)
     */
    public static function decode($data, $key)
    {
        $decrypted = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, base64_decode($data), MCRYPT_MODE_ECB);

        $dec_s = strlen($decrypted);
        $padding = ord($decrypted[$dec_s - 1]);
        $decrypted = substr($decrypted, 0, -$padding);

        return $decrypted;
    }

}