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File: src/Core/ChaCha20/IetfCtx.php

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File: src/Core/ChaCha20/IetfCtx.php
Role: Class source
Content type: text/plain
Description: Class source
Class: PHP Sodium Compat
Cryptographic functions of libsodium in pure PHP
Author: By
Last change: Update docblocks.
Date: 6 months ago
Size: 1,322 bytes
 

Contents

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<?php

if (class_exists('ParagonIE_Sodium_Core_ChaCha20_IetfCtx', false)) {
    return;
}

/**
 * Class ParagonIE_Sodium_Core_ChaCha20_IetfCtx
 */
class ParagonIE_Sodium_Core_ChaCha20_IetfCtx extends ParagonIE_Sodium_Core_ChaCha20_Ctx
{
   
/**
     * ParagonIE_Sodium_Core_ChaCha20_IetfCtx constructor.
     *
     * @internal You should not use this directly from another application
     *
     * @param string $key ChaCha20 key.
     * @param string $iv Initialization Vector (a.k.a. nonce).
     * @param string $counter The initial counter value.
     * Defaults to 4 0x00 bytes.
     * @throws InvalidArgumentException
     * @throws TypeError
     */
   
public function __construct($key = '', $iv = '', $counter = '')
    {
        if (
self::strlen($iv) !== 12) {
            throw new
InvalidArgumentException('ChaCha20 expects a 96-bit nonce in IETF mode.');
        }
       
parent::__construct($key, self::substr($iv, 0, 8), $counter);

        if (!empty(
$counter)) {
           
$this->container[12] = self::load_4(self::substr($counter, 0, 4));
        }
       
$this->container[13] = self::load_4(self::substr($iv, 0, 4));
       
$this->container[14] = self::load_4(self::substr($iv, 4, 4));
       
$this->container[15] = self::load_4(self::substr($iv, 8, 4));
    }
}