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<?php |
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if (class_exists('ParagonIE_Sodium_Core_XChaCha20', false)) { |
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return; |
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} |
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/** |
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* Class ParagonIE_Sodium_Core_XChaCha20 |
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*/ |
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class ParagonIE_Sodium_Core_XChaCha20 extends ParagonIE_Sodium_Core_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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* |
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* @param int $len |
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* @param string $nonce |
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* @param string $key |
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* @return string |
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* @throws SodiumException |
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* @throws TypeError |
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*/ |
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public static function stream($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_Core_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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), |
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self::substr($nonce, 16, 8) |
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), |
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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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* |
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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 $ic |
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* @return string |
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* @throws SodiumException |
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* @throws TypeError |
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*/ |
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public static function streamXorIc($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_Core_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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$ic |
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), |
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$message |
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); |
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} |
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} |