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Editing: XChaCha20.php
<?php if (class_exists('ParagonIE_Sodium_Core_XChaCha20', false)) { return; } /** * Class ParagonIE_Sodium_Core_XChaCha20 */ class ParagonIE_Sodium_Core_XChaCha20 extends ParagonIE_Sodium_Core_HChaCha20 { /** * @internal You should not use this directly from another application * * @param int $len * @param string $nonce * @param string $key * @return string * @throws SodiumException * @throws TypeError */ public static function stream($len, $nonce, $key) { if (self::strlen($nonce) !== 24) { throw new SodiumException('Nonce must be 24 bytes long'); } return self::encryptBytes( new ParagonIE_Sodium_Core_ChaCha20_Ctx( self::hChaCha20( self::substr($nonce, 0, 16), $key ), self::substr($nonce, 16, 8) ), str_repeat("\x00", $len) ); } /** * @internal You should not use this directly from another application * * @param int $len * @param string $nonce * @param string $key * @return string * @throws SodiumException * @throws TypeError */ public static function ietfStream($len, $nonce, $key) { if (self::strlen($nonce) !== 24) { throw new SodiumException('Nonce must be 24 bytes long'); } return self::encryptBytes( new ParagonIE_Sodium_Core_ChaCha20_IetfCtx( self::hChaCha20( self::substr($nonce, 0, 16), $key ), "\x00\x00\x00\x00" . self::substr($nonce, 16, 8) ), str_repeat("\x00", $len) ); } /** * @internal You should not use this directly from another application * * @param string $message * @param string $nonce * @param string $key * @param string $ic * @return string * @throws SodiumException * @throws TypeError */ public static function streamXorIc($message, $nonce, $key, $ic = '') { if (self::strlen($nonce) !== 24) { throw new SodiumException('Nonce must be 24 bytes long'); } return self::encryptBytes( new ParagonIE_Sodium_Core_ChaCha20_Ctx( self::hChaCha20(self::substr($nonce, 0, 16), $key), self::substr($nonce, 16, 8), $ic ), $message ); } /** * @internal You should not use this directly from another application * * @param string $message * @param string $nonce * @param string $key * @param string $ic * @return string * @throws SodiumException * @throws TypeError */ public static function ietfStreamXorIc($message, $nonce, $key, $ic = '') { if (self::strlen($nonce) !== 24) { throw new SodiumException('Nonce must be 24 bytes long'); } return self::encryptBytes( new ParagonIE_Sodium_Core_ChaCha20_IetfCtx( self::hChaCha20(self::substr($nonce, 0, 16), $key), "\x00\x00\x00\x00" . self::substr($nonce, 16, 8), $ic ), $message ); } }
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