php/java AES encrypt ref: 1. https://bluehua.org/2010/03/20/1039.html 2. https://github.com/stevenholder/PHP-Java-AES-Encrypt

aes.java

package demo;


import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

public class aes {
 
    /** 
     * java字节码转字符串 
     * @param b 
     * @return 
     */
    public static String byte2hex(byte[] b) { //一个字节的数，
 
        // 转成16进制字符串
 
        String hs = "";
        String tmp = "";
        for (int n = 0; n < b.length; n++) {
            //整数转成十六进制表示
            tmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
            if (tmp.length() == 1) {
                hs = hs + "0" + tmp;
            } else {
                hs = hs + tmp;
            }
        }
        tmp = null;
        return hs.toUpperCase(); //转成大写
 
    }
 
    /**
     * 字符串转java字节码
     * @param b
     * @return
     */
    public static byte[] hex2byte(byte[] b) {
        if ((b.length % 2) != 0) {
            throw new IllegalArgumentException("长度不是偶数");
        }
        byte[] b2 = new byte[b.length / 2];
        for (int n = 0; n < b.length; n += 2) {
            String item = new String(b, n, 2);
            // 两位一组，表示一个字节,把这样表示的16进制字符串，还原成一个进制字节
 
            b2[n / 2] = (byte) Integer.parseInt(item, 16);
        }
        b = null;
        return b2;
    }
	
	public static String encrypt(String input, String key) {
		byte[] crypted = null;
		try {
			SecretKeySpec skey = new SecretKeySpec(key.getBytes(), "AES");
			Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
			cipher.init(Cipher.ENCRYPT_MODE, skey);
			crypted = cipher.doFinal(input.getBytes());
		} catch (Exception e) {
			System.out.println(e.toString());
		}
		return new String(byte2hex(crypted));
	}

	public static String decrypt(String input, String key) {
		byte[] output = null;
		try {
			SecretKeySpec skey = new SecretKeySpec(key.getBytes(), "AES");
			Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
			cipher.init(Cipher.DECRYPT_MODE, skey);
			output = cipher.doFinal(hex2byte(input.getBytes()));
		} catch (Exception e) {
			System.out.println(e.toString());
		}
		return new String(output);
	}

	public static void main(String[] args) {

		String key = "1234567890123456";
		String data = "abcd";
		System.out.println(encrypt(data, key));

		System.out.println(decrypt(encrypt(data, key), key));
	}
}

example.php

$aes = new CryptAES();
$aes->set_key('1234567890123456');
$aes->require_pkcs5();
$rt = $aes->encrypt('abcd');
echo $rt . PHP_EOL;
echo $aes->decrypt($rt) . PHP_EOL;

gistfile1.txt

class CryptAES
{
    protected $cipher     = MCRYPT_RIJNDAEL_128;
    protected $mode       = MCRYPT_MODE_ECB;
    protected $pad_method = NULL;
    protected $secret_key = '';
    protected $iv         = '';


    public function set_cipher($cipher)
    {
        $this->cipher = $cipher;
    }

    public function set_mode($mode)
    {
        $this->mode = $mode;
    }

    public function set_iv($iv)
    {
        $this->iv = $iv;
    }

    public function set_key($key)
    {
        $this->secret_key = $key;
    }

    public function require_pkcs5()
    {
        $this->pad_method = 'pkcs5';
    }

    protected function pad_or_unpad($str, $ext)
    {
        if ( is_null($this->pad_method) )
        {
            return $str;
        }
        else
        {
            $func_name = __CLASS__ . '::' . $this->pad_method . '_' . $ext . 'pad';
            if ( is_callable($func_name) )
            {
                $size = mcrypt_get_block_size($this->cipher, $this->mode);
                return call_user_func($func_name, $str, $size);
            }
        }

        return $str;
    }

    protected function pad($str)
    {
        return $this->pad_or_unpad($str, '');
    }

    protected function unpad($str)
    {
        return $this->pad_or_unpad($str, 'un');
    }


    public function encrypt($str)
    {
        $str = $this->pad($str);
        $td = mcrypt_module_open($this->cipher, '', $this->mode, '');

        if ( empty($this->iv) )
        {
            $iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
        }
        else
        {
            $iv = $this->iv;
        }

        mcrypt_generic_init($td, $this->secret_key, $iv);
        $cyper_text = mcrypt_generic($td, $str);

        $rt = bin2hex($cyper_text);

        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);

        return $rt;
    }


    public function decrypt($str){
        $td = mcrypt_module_open($this->cipher, '', $this->mode, '');

        if ( empty($this->iv) )
        {
            $iv = @mcrypt_create_iv(mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
        }
        else
        {
            $iv = $this->iv;
        }

        mcrypt_generic_init($td, $this->secret_key, $iv);
        $decrypted_text = mdecrypt_generic($td, self::hex2bin($str));
        $rt = $decrypted_text;
        mcrypt_generic_deinit($td);
        mcrypt_module_close($td);

        return $this->unpad($rt);
    }

    public static function hex2bin($hexdata) {
        $bindata = '';
        $length = strlen($hexdata);
        for ($i=0; $i < $length; $i += 2)
        {
            $bindata .= chr(hexdec(substr($hexdata, $i, 2)));
        }
        return $bindata;
    }

    public static function pkcs5_pad($text, $blocksize)
    {
        $pad = $blocksize - (strlen($text) % $blocksize);
        return $text . str_repeat(chr($pad), $pad);
    }

    public static function pkcs5_unpad($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);
    }
}