PHP中的AES-256加密

Question

我需要一个PHP函数,AES256_encode($dataToEcrypt)加密$data到AES-256,另一个AES256_decode($encryptedData)反过来.有谁知道这个函数应该有什么代码？

Answer 1

看看mcrypt模块

AES-Rijndael示例取自此处

$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128, MCRYPT_MODE_CBC);
$iv = mcrypt_create_iv($iv_size, MCRYPT_DEV_URANDOM);
$key = pack('H*', "bcb04b7e103a0cd8b54763051cef08bc55abe029fdebae5e1d417e2ffb2a00a3");
# show key size use either 16, 24 or 32 byte keys for AES-128, 192
# and 256 respectively
$key_size =  strlen($key);
echo "Key size: " . $key_size . "\n";
$text = "Meet me at 11 o'clock behind the monument.";
echo strlen($text) . "\n";

$crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $text, MCRYPT_MODE_CBC, $iv);
echo strlen($crypttext) . "\n";

这是解密功能

Answer 2

我需要一个PHP函数,AES256_encode($dataToEcrypt)加密$data到AES-256,另一个AES256_decode($encryptedData)反过来.有谁知道这个函数应该有什么代码？

加密和编码之间存在差异.

你真的需要AES-256吗？AES-256与AES-128的安全性并不显着; 你更容易搞砸协议层而不是被黑客攻击,因为你使用的是128位分组密码而不是256位分组密码.

重要 - 使用库

• 化解/ PHP的加密
• PECL libsodium
• 岩盐(libsodium包装,现在稳定)

快速而肮脏的AES-256实施

如果你有兴趣建立自己的不是为了在生产中部署它而是为了你自己的教育,我已经包括一个样本AES256

/**
 * This is a quick and dirty proof of concept for StackOverflow.
 * 
 * @ref http://stackoverflow.com/q/6770370/2224584
 * 
 * Do not use this in production.
 */
abstract class ExperimentalAES256DoNotActuallyUse
{
    /**
     * Encrypt with AES-256-CTR + HMAC-SHA-512
     * 
     * @param string $plaintext Your message
     * @param string $encryptionKey Key for encryption
     * @param string $macKey Key for calculating the MAC
     * @return string
     */
    public static function encrypt($plaintext, $encryptionKey, $macKey)
    {
        $nonce = random_bytes(16);
        $ciphertext = openssl_encrypt(
            $plaintext,
            'aes-256-ctr',
            $encryptionKey,
            OPENSSL_RAW_DATA,
            $nonce
        );
        $mac = hash_hmac('sha512', $nonce.$ciphertext, $macKey, true);
        return base64_encode($mac.$nonce.$ciphertext);
    }

    /**
     * Verify HMAC-SHA-512 then decrypt AES-256-CTR
     * 
     * @param string $message Encrypted message
     * @param string $encryptionKey Key for encryption
     * @param string $macKey Key for calculating the MAC
     */
    public static function decrypt($message, $encryptionKey, $macKey)
    {
        $decoded = base64_decode($message);
        $mac = mb_substr($message, 0, 64, '8bit');
        $nonce = mb_substr($message, 64, 16, '8bit');
        $ciphertext = mb_substr($message, 80, null, '8bit');

        $calc = hash_hmac('sha512', $nonce.$ciphertext, $macKey, true);
        if (!hash_equals($calc, $mac)) {
            throw new Exception('Invalid MAC');
        }
        return openssl_decrypt(
            $ciphertext,
            'aes-256-ctr',
            $encryptionKey,
            OPENSSL_RAW_DATA,
            $nonce
        );
    }
}

用法

首先,生成两个键(是的,其中两个)并以某种方式存储它们.

$eKey = random_bytes(32);
$aKey = random_bytes(32);

然后加密/解密消息:

$plaintext = 'This is just a test message.';
$encrypted = ExperimentalAES256DoNotActuallyUse::encrypt($plaintext, $eKey, $aKey);
$decrypted = ExperimentalAES256DoNotActuallyUse::decrypt($encrypted, $eKey, $aKey);

如果你没有random_bytes(),请获取random_compat.

Answer 3

MCRYPT_RIJNDAEL_256不等同于AES_256.

使RIJNDAEL从AES解密的方法是使用MCRYPT_RIJNDAEL_128并在加密前填充字符串进行加密

AES-256的BlockSize = 128bit,KeySize = 256bit Rijndael-256的BlockSize = 256bit,KeySize = 256bit

只有AES/Rijndael 128bit是完全相同的.Rijndael-192和Rijndael-256与AES-192和AES-256不同(块大小和轮数不同).