PHP 中的 AES-256 加密

我需要一个PHP函数,将加密成AES-256,另一个函数则相反。有谁知道这个函数应该有什么代码?AES256_encode($dataToEcrypt)$dataAES256_decode($encryptedData)


答案 1

查看 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


答案 2

我需要一个PHP函数,将加密成AES-256,另一个函数则相反。有谁知道这个函数应该有什么代码?AES256_encode($dataToEcrypt)$dataAES256_decode($encryptedData)

加密和编码之间是有区别的

你真的需要AES-256吗?AES-256与AES-128的安全性并不那么重要。你更有可能在协议层搞砸,而不是被黑客入侵,因为你使用了128位块密码而不是256位块密码。

重要 - 使用库

A flowchart for PHP users

快速且肮脏的AES-256实施

如果您有兴趣构建自己的产品,不是为了在生产环境中部署它,而是为了您自己的教育,那么我提供了一个示例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,生成两个密钥(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);

如果没有,请random_compatrandom_bytes()


推荐