public static function ParagonIE_Sodium_Crypto32::aead_chacha20poly1305_encrypt in Automatic Updates 7

Same name and namespace in other branches

1. 8 vendor/paragonie/sodium_compat/src/Crypto32.php \ParagonIE_Sodium_Crypto32::aead_chacha20poly1305_encrypt()

AEAD Encryption with ChaCha20-Poly1305

@internal Do not use this directly. Use ParagonIE_Sodium_Compat.

Parameters

string $message:

string $ad:

string $nonce:

string $key:

Return value

string

Throws

SodiumException

TypeError

1 call to ParagonIE_Sodium_Crypto32::aead_chacha20poly1305_encrypt()

ParagonIE_Sodium_Compat::crypto_aead_chacha20poly1305_encrypt in vendor/paragonie/sodium_compat/src/Compat.php

Authenticated Encryption with Associated Data

File

vendor/paragonie/sodium_compat/src/Crypto32.php, line 143

Class

ParagonIE_Sodium_Crypto32

Class ParagonIE_Sodium_Crypto

Code

public static function aead_chacha20poly1305_encrypt($message = '', $ad = '', $nonce = '', $key = '') {

  /** @var int $len - Length of the plaintext message */
  $len = ParagonIE_Sodium_Core32_Util::strlen($message);

  /** @var int $adlen - Length of the associated data */
  $adlen = ParagonIE_Sodium_Core32_Util::strlen($ad);

  /** @var string The first block of the chacha20 keystream, used as a poly1305 key */
  $block0 = ParagonIE_Sodium_Core32_ChaCha20::stream(32, $nonce, $key);
  $state = new ParagonIE_Sodium_Core32_Poly1305_State($block0);
  try {
    ParagonIE_Sodium_Compat::memzero($block0);
  } catch (SodiumException $ex) {
    $block0 = null;
  }

  /** @var string $ciphertext - Raw encrypted data */
  $ciphertext = ParagonIE_Sodium_Core32_ChaCha20::streamXorIc($message, $nonce, $key, ParagonIE_Sodium_Core32_Util::store64_le(1));
  $state
    ->update($ad);
  $state
    ->update(ParagonIE_Sodium_Core32_Util::store64_le($adlen));
  $state
    ->update($ciphertext);
  $state
    ->update(ParagonIE_Sodium_Core32_Util::store64_le($len));
  return $ciphertext . $state
    ->finish();
}