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Dec 26, 2024 pm 08:33 PM

How Can I Encrypt and Decrypt Strings in PHP Securely?

PHP ???? ??? ????? ??????

PHP ???? ?????? ?? ???? ?? ???? ???? ???? ???? ???. ?? ??. ???? ????? ?? ???? ???? ?? ??? ? ?? ??? ?????.

??? ????

  1. ???: ?? ???? ??????. CTR(??? ??) ?? GCM(Galois/Counter)?? AES-256? ?? ?? ????? ?????. ??).
  2. ??: HMAC-SHA-256? ???? ???? ???? ?? MAC(??? ?? ??)? ?????. ???? ???? MAC? ???? ?? ???? ??? ?????.

??? ????

  1. ??: ???? ??? MAC?? ???? ??? MAC? ?????. ?? ??? ?????.
  2. ???: ??? ?? ???? ???? ???? ??????.

?? ?? ??

  • ??? ??? ???? ??(?: AES-GCM, ChaCha20-Poly1305)? ???? ??? ? ??? ?? ?????.
  • ??? ??? ? ?? ?? ??? ?? libsodium ?? defuse/php-encryption? ?? ?? ?????? ?????.
  • ???? ?? ???? ?? ?? ??? ??? ????. .
  • CSPRNG(Cryptographically Secure)? ???? IV(??? ??) ?? ?? ?? ???)(?: Random_bytes ?? Sodium_randombytes).
  • ??? ?? ???? ?????. ? ??? ? ?? ?? ? ?? ??? ??? ??????.

Libsodium ?? ?:

<?php
use Sodium\Crypto;

function encrypt(string $message, string $key): string
{
    $nonce = random_bytes(Crypto::SECRETBOX_NONCEBYTES);
    $encrypted = Crypto::secretbox($message, $nonce, $key);
    return base64_encode($nonce . $encrypted);
}

function decrypt(string $encrypted, string $key): string
{
    $decoded = base64_decode($encrypted);
    $nonce = substr($decoded, 0, Crypto::SECRETBOX_NONCEBYTES);
    $ciphertext = substr($decoded, Crypto::SECRETBOX_NONCEBYTES);
    $decrypted = Crypto::secretbox_open($ciphertext, $nonce, $key);
    
    return $decrypted;
}

$message = 'Hello, world!';
$key = random_bytes(Crypto::SECRETBOX_KEYBYTES);
$encrypted = encrypt($message, $key);
$decrypted = decrypt($encrypted, $key);

var_dump($encrypted);
var_dump($decrypted);

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