Summery Summery
AEAD Encryption with ChaCha20-Poly1305
Syntax Syntax
Parameters Parameters
- $message
-
(Optional)
Default value: ''
- $ad
-
(Optional)
Default value: ''
- $nonce
-
(Optional)
Default value: ''
- $key
-
(Optional)
Default value: ''
Return Return
(string)
Source Source
File: wp-includes/sodium_compat/src/Crypto.php
public static function aead_chacha20poly1305_encrypt( $message = '', $ad = '', $nonce = '', $key = '' ) { /** @var int $len - Length of the plaintext message */ $len = ParagonIE_Sodium_Core_Util::strlen($message); /** @var int $adlen - Length of the associated data */ $adlen = ParagonIE_Sodium_Core_Util::strlen($ad); /** @var string The first block of the chacha20 keystream, used as a poly1305 key */ $block0 = ParagonIE_Sodium_Core_ChaCha20::stream( 32, $nonce, $key ); $state = new ParagonIE_Sodium_Core_Poly1305_State($block0); try { ParagonIE_Sodium_Compat::memzero($block0); } catch (SodiumException $ex) { $block0 = null; } /** @var string $ciphertext - Raw encrypted data */ $ciphertext = ParagonIE_Sodium_Core_ChaCha20::streamXorIc( $message, $nonce, $key, ParagonIE_Sodium_Core_Util::store64_le(1) ); $state->update($ad); $state->update(ParagonIE_Sodium_Core_Util::store64_le($adlen)); $state->update($ciphertext); $state->update(ParagonIE_Sodium_Core_Util::store64_le($len)); return $ciphertext . $state->finish(); }