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<?php

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if (class_exists('ParagonIE_Sodium_Core_ChaCha20_IetfCtx', false)) {

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return;

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}

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/**

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* Class ParagonIE_Sodium_Core_ChaCha20_IetfCtx

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class ParagonIE_Sodium_Core_ChaCha20_IetfCtx extends ParagonIE_Sodium_Core_ChaCha20_Ctx

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{

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/**

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* ParagonIE_Sodium_Core_ChaCha20_IetfCtx constructor.

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* @internal You should not use this directly from another application

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* @param string $key ChaCha20 key.

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* @param string $iv Initialization Vector (a.k.a. nonce).

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* @param string $counter The initial counter value.

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* Defaults to 4 0x00 bytes.

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* @throws InvalidArgumentException

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* @throws TypeError

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public function __construct($key = '', $iv = '', $counter = '')

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{

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if (self::strlen($iv) !== 12) {

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throw new InvalidArgumentException('ChaCha20 expects a 96-bit nonce in IETF mode.');

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}

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parent::__construct($key, self::substr($iv, 0, 8), $counter);

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if (!empty($counter)) {

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$this->container[12] = self::load_4(self::substr($counter, 0, 4));

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}

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$this->container[13] = self::load_4(self::substr($iv, 0, 4));

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$this->container[14] = self::load_4(self::substr($iv, 4, 4));

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$this->container[15] = self::load_4(self::substr($iv, 8, 4));

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}

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}

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