Crypto Sodium

A simple library that packages functional sodium_crypt_* into objects.

Inputs and outputs are binary data, don't be afraid to use the petrknap/binary.

Examples

Symmetric block encryption

use PetrKnap\CryptoSodium\SecretBox;

$secretBox = new SecretBox();
$message = 'Hello World!';
$key = $secretBox->generateKey();

$ciphertext = $secretBox->encrypt($message, $key);

echo $secretBox->decrypt($ciphertext, $key);

$secretBox->eraseData($key);

Asymmetric block encryption

use PetrKnap\CryptoSodium\Box;

$box = new Box();
$message = 'Hello World!';
$keyPair = $box->generateKeyPair();

$ciphertext = $box->encrypt($message, $keyPair);

echo $box->decrypt($ciphertext, $keyPair);

$box->eraseData($keyPair);

Symmetric stream encryption

use PetrKnap\CryptoSodium\SecretStream\XChaCha20Poly1305;

$xChaCha20Poly1305 = new XChaCha20Poly1305();
$messageChunk1 = 'Hello ';
$messageChunk2 = 'World!';
$key = $xChaCha20Poly1305->generateKey();

$pushStream = $xChaCha20Poly1305->initPush($key);
$ciphertextHeader = $pushStream->header;
$ciphertextChunk1 = $pushStream->push($messageChunk1);
$ciphertextChunk2 = $pushStream->push($messageChunk2, tag: XChaCha20Poly1305::TAG_FINAL);

$pullStream = $xChaCha20Poly1305->initPull($ciphertextHeader, $key);
echo $pullStream->pull($ciphertextChunk1);
echo $pullStream->pull($ciphertextChunk2);

$xChaCha20Poly1305->eraseData($key);

Symmetric block encryption with additional data

use PetrKnap\CryptoSodium\Aead\Aes256Gcm;

$aes256Gcm = new Aes256Gcm();
$message = 'Hello World!';
$purpose = 'example';
$key = $aes256Gcm->generateKey();

$ciphertext = $aes256Gcm->encrypt($message, $key, additionalData: $purpose);

echo $aes256Gcm->decrypt($ciphertext, $key, additionalData: $purpose);

$aes256Gcm->eraseData($key);

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Run composer require petrknap/crypto-sodium to install it. You can support this project via donation. The project is licensed under the terms of the LGPL-3.0-or-later.