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<?php

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if (class_exists('ParagonIE_Sodium_Core32_XChaCha20', false)) {

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return;

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}

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/**

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* Class ParagonIE_Sodium_Core32_XChaCha20

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class ParagonIE_Sodium_Core32_XChaCha20 extends ParagonIE_Sodium_Core32_HChaCha20

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{

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/**

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

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* @param int $len

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* @param string $nonce

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* @param string $key

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* @return string

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* @throws SodiumException

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* @throws TypeError

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public static function stream($len = 64, $nonce = '', $key = '')

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{

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if (self::strlen($nonce) !== 24) {

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throw new SodiumException('Nonce must be 24 bytes long');

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}

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return self::encryptBytes(

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new ParagonIE_Sodium_Core32_ChaCha20_Ctx(

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self::hChaCha20(

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self::substr($nonce, 0, 16),

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$key

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self::substr($nonce, 16, 8)

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str_repeat("\x00", $len)

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);

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}

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/**

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

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* @param string $message

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* @param string $nonce

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* @param string $key

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* @param string $ic

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* @return string

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* @throws SodiumException

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* @throws TypeError

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public static function streamXorIc($message, $nonce = '', $key = '', $ic = '')

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{

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if (self::strlen($nonce) !== 24) {

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throw new SodiumException('Nonce must be 24 bytes long');

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}

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return self::encryptBytes(

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new ParagonIE_Sodium_Core32_ChaCha20_Ctx(

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self::hChaCha20(self::substr($nonce, 0, 16), $key),

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self::substr($nonce, 16, 8),

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$ic

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$message

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);

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}

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/**

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

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* @param string $message

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* @param string $nonce

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* @param string $key

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* @param string $ic

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* @return string

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* @throws SodiumException

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* @throws TypeError

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public static function ietfStreamXorIc($message, $nonce = '', $key = '', $ic = '')

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{

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return self::encryptBytes(

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new ParagonIE_Sodium_Core32_ChaCha20_IetfCtx(

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self::hChaCha20(self::substr($nonce, 0, 16), $key),

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"\x00\x00\x00\x00" . self::substr($nonce, 16, 8),

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$ic

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$message

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);

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}

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}

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