1.php和java的aes默认加密算法有点区别，php能解密java加密的密文，但java不能解密php加密的密文。原因在于：

1.Java中AES加密与解密默认使用AES/ECB/PKCS5Padding模式；

2.php中的AES算法实现使用AES/ECB/NoPadding

所以，把php的aes加密算法的补码方式采用 PKCS5Padding 模式即可。

附上可用的php和java 加解密互通的算法类。

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);

$rt=base64_encode($cyper_text);

//$rt = bin2hex($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));

$decrypted_text = mdecrypt_generic($td, base64_decode($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);

}

}

$keyStr = '1345679';

$plainText = 'a1e470e3bcc2953626cd6341fea4bd68';

$aes = new CryptAES();

$aes->set_key($keyStr);

$aes->require_pkcs5();

$encText = $aes->encrypt($plainText);

$decString = $aes->decrypt('$encText');