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<?php

if (class_exists('ParagonIE_Sodium_File', false)) {
    return;
}
class ParagonIE_Sodium_File extends ParagonIE_Sodium_Core_Util
{
    const BUFFER_SIZE = 8192;
    public static function box($inputFile, $outputFile, $nonce, $keyPair)
    {
        if (!is_string($inputFile)) {
            throw new TypeError('Argument 1 must be a string, ' . gettype($inputFile) . ' given.');
        }
        if (!is_string($outputFile)) {
            throw new TypeError('Argument 2 must be a string, ' . gettype($outputFile) . ' given.');
        }
        if (!is_string($nonce)) {
            throw new TypeError('Argument 3 must be a string, ' . gettype($nonce) . ' given.');
        }
        if (!is_string($keyPair)) {
            throw new TypeError('Argument 4 must be a string, ' . gettype($keyPair) . ' given.');
        }
        if (self::strlen($nonce) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_NONCEBYTES) {
            throw new TypeError('Argument 3 must be CRYPTO_BOX_NONCEBYTES bytes');
        }
        if (self::strlen($keyPair) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES) {
            throw new TypeError('Argument 4 must be CRYPTO_BOX_KEYPAIRBYTES bytes');
        }
        $size = filesize($inputFile);
        if (!is_int($size)) {
            throw new SodiumException('Could not obtain the file size');
        }
        $ifp = fopen($inputFile, 'rb');
        if (!is_resource($ifp)) {
            throw new SodiumException('Could not open input file for reading');
        }
        $ofp = fopen($outputFile, 'wb');
        if (!is_resource($ofp)) {
            fclose($ifp);
            throw new SodiumException('Could not open output file for writing');
        }
        $res = self::box_encrypt($ifp, $ofp, $size, $nonce, $keyPair);
        fclose($ifp);
        fclose($ofp);
        return $res;
    }
    public static function box_open($inputFile, $outputFile, $nonce, $keypair)
    {
        if (!is_string($inputFile)) {
            throw new TypeError('Argument 1 must be a string, ' . gettype($inputFile) . ' given.');
        }
        if (!is_string($outputFile)) {
            throw new TypeError('Argument 2 must be a string, ' . gettype($outputFile) . ' given.');
        }
        if (!is_string($nonce)) {
            throw new TypeError('Argument 3 must be a string, ' . gettype($nonce) . ' given.');
        }
        if (!is_string($keypair)) {
            throw new TypeError('Argument 4 must be a string, ' . gettype($keypair) . ' given.');
        }
        if (self::strlen($nonce) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_NONCEBYTES) {
            throw new TypeError('Argument 4 must be CRYPTO_BOX_NONCEBYTES bytes');
        }
        if (self::strlen($keypair) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES) {
            throw new TypeError('Argument 4 must be CRYPTO_BOX_KEYPAIRBYTES bytes');
        }
        $size = filesize($inputFile);
        if (!is_int($size)) {
            throw new SodiumException('Could not obtain the file size');
        }
        $ifp = fopen($inputFile, 'rb');
        if (!is_resource($ifp)) {
            throw new SodiumException('Could not open input file for reading');
        }
        $ofp = fopen($outputFile, 'wb');
        if (!is_resource($ofp)) {
            fclose($ifp);
            throw new SodiumException('Could not open output file for writing');
        }
        $res = self::box_decrypt($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 $res;
    }
    public static function box_seal($inputFile, $outputFile, $publicKey)
    {
        if (!is_string($inputFile)) {
            throw new TypeError('Argument 1 must be a string, ' . gettype($inputFile) . ' given.');
        }
        if (!is_string($outputFile)) {
            throw new TypeError('Argument 2 must be a string, ' . gettype($outputFile) . ' given.');
        }
        if (!is_string($publicKey)) {
            throw new TypeError('Argument 3 must be a string, ' . gettype($publicKey) . ' given.');
        }
        if (self::strlen($publicKey) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES) {
            throw new TypeError('Argument 3 must be CRYPTO_BOX_PUBLICKEYBYTES bytes');
        }
        $size = filesize($inputFile);
        if (!is_int($size)) {
            throw new SodiumException('Could not obtain the file size');
        }
        $ifp = fopen($inputFile, 'rb');
        if (!is_resource($ifp)) {
            throw new SodiumException('Could not open input file for reading');
        }
        $ofp = fopen($outputFile, 'wb');
        if (!is_resource($ofp)) {
            fclose($ifp);
            throw new SodiumException('Could not open output file for writing');
        }
        $ephKeypair = ParagonIE_Sodium_Compat::crypto_box_keypair();
        $msgKeypair = ParagonIE_Sodium_Compat::crypto_box_keypair_from_secretkey_and_publickey(ParagonIE_Sodium_Compat::crypto_box_secretkey($ephKeypair), $publicKey);
        $ephemeralPK = ParagonIE_Sodium_Compat::crypto_box_publickey($ephKeypair);
        $nonce = ParagonIE_Sodium_Compat::crypto_generichash($ephemeralPK . $publicKey, '', 24);
        $firstWrite = fwrite($ofp, $ephemeralPK, ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES);
        if (!is_int($firstWrite)) {
            fclose($ifp);
            fclose($ofp);
            ParagonIE_Sodium_Compat::memzero($ephKeypair);
            throw new SodiumException('Could not write to output file');
        }
        if ($firstWrite !== ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES) {
            ParagonIE_Sodium_Compat::memzero($ephKeypair);
            fclose($ifp);
            fclose($ofp);
            throw new SodiumException('Error writing public key to output file');
        }
        $res = self::box_encrypt($ifp, $ofp, $size, $nonce, $msgKeypair);
        fclose($ifp);
        fclose($ofp);
        try {
            ParagonIE_Sodium_Compat::memzero($nonce);
            ParagonIE_Sodium_Compat::memzero($ephKeypair);
        } catch (SodiumException $ex) {
            unset($ephKeypair);
        }
        return $res;
    }
    public static function box_seal_open($inputFile, $outputFile, $ecdhKeypair)
    {
        if (!is_string($inputFile)) {
            throw new TypeError('Argument 1 must be a string, ' . gettype($inputFile) . ' given.');
        }
        if (!is_string($outputFile)) {
            throw new TypeError('Argument 2 must be a string, ' . gettype($outputFile) . ' given.');
        }
        if (!is_string($ecdhKeypair)) {
            throw new TypeError('Argument 3 must be a string, ' . gettype($ecdhKeypair) . ' given.');
        }
        if (self::strlen($ecdhKeypair) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES) {
            throw new TypeError('Argument 3 must be CRYPTO_BOX_KEYPAIRBYTES bytes');
        }
        $publicKey = ParagonIE_Sodium_Compat::crypto_box_publickey($ecdhKeypair);
        $size = filesize($inputFile);
        if (!is_int($size)) {
            throw new SodiumException('Could not obtain the file size');
        }
        $ifp = fopen($inputFile, 'rb');
        if (!is_resource($ifp)) {
            throw new SodiumException('Could not open input file for reading');
        }
        $ofp = fopen($outputFile, 'wb');
        if (!is_resource($ofp)) {
            fclose($ifp);
            throw new SodiumException('Could not open output file for writing');
        }
        $ephemeralPK = fread($ifp, ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES);
        if (!is_string($ephemeralPK)) {
            throw new SodiumException('Could not read input file');
        }
        if (self::strlen($ephemeralPK) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES) {
            fclose($ifp);
            fclose($ofp);
            throw new SodiumException('Could not read public key from sealed file');
        }
        $nonce = ParagonIE_Sodium_Compat::crypto_generichash($ephemeralPK . $publicKey, '', 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 $res;
    }
    public static function generichash($filePath, $key = '', $outputLength = 32)
    {
        if (!is_string($filePath)) {
            throw new TypeError('Argument 1 must be a string, ' . gettype($filePath) . ' given.');
        }
        if (!is_string($key)) {
            if (is_null($key)) {
                $key = '';
            } else {
                throw new TypeError('Argument 2 must be a string, ' . gettype($key) . ' given.');
            }
        }
        if (!is_int($outputLength)) {
            if (!is_numeric($outputLength)) {
                throw new TypeError('Argument 3 must be an integer, ' . gettype($outputLength) . ' given.');
            }
            $outputLength = (int) $outputLength;
        }
        if (!empty($key)) {
            if (self::strlen($key) < ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_KEYBYTES_MIN) {
                throw new TypeError('Argument 2 must be at least CRYPTO_GENERICHASH_KEYBYTES_MIN bytes');
            }
            if (self::strlen($key) > ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_KEYBYTES_MAX) {
                throw new TypeError('Argument 2 must be at most CRYPTO_GENERICHASH_KEYBYTES_MAX bytes');
            }
        }
        if ($outputLength < ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_BYTES_MIN) {
            throw new SodiumException('Argument 3 must be at least CRYPTO_GENERICHASH_BYTES_MIN');
        }
        if ($outputLength > ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_BYTES_MAX) {
            throw new SodiumException('Argument 3 must be at least CRYPTO_GENERICHASH_BYTES_MAX');
        }
        $size = filesize($filePath);
        if (!is_int($size)) {
            throw new SodiumException('Could not obtain the file size');
        }
        $fp = fopen($filePath, 'rb');
        if (!is_resource($fp)) {
            throw new SodiumException('Could not open input file for reading');
        }
        $ctx = ParagonIE_Sodium_Compat::crypto_generichash_init($key, $outputLength);
        while ($size > 0) {
            $blockSize = $size > 64 ? 64 : $size;
            $read = fread($fp, $blockSize);
            if (!is_string($read)) {
                throw new SodiumException('Could not read input file');
            }
            ParagonIE_Sodium_Compat::crypto_generichash_update($ctx, $read);
            $size -= $blockSize;
        }
        fclose($fp);
        return ParagonIE_Sodium_Compat::crypto_generichash_final($ctx, $outputLength);
    }
    public static function secretbox($inputFile, $outputFile, $nonce, $key)
    {
        if (!is_string($inputFile)) {
            throw new TypeError('Argument 1 must be a string, ' . gettype($inputFile) . ' given..');
        }
        if (!is_string($outputFile)) {
            throw new TypeError('Argument 2 must be a string, ' . gettype($outputFile) . ' given.');
        }
        if (!is_string($nonce)) {
            throw new TypeError('Argument 3 must be a string, ' . gettype($nonce) . ' given.');
        }
        if (self::strlen($nonce) !== ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_NONCEBYTES) {
            throw new TypeError('Argument 3 must be CRYPTO_SECRETBOX_NONCEBYTES bytes');
        }
        if (!is_string($key)) {
            throw new TypeError('Argument 4 must be a string, ' . gettype($key) . ' given.');
        }
        if (self::strlen($key) !== ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_KEYBYTES) {
            throw new TypeError('Argument 4 must be CRYPTO_SECRETBOX_KEYBYTES bytes');
        }
        $size = filesize($inputFile);
        if (!is_int($size)) {
            throw new SodiumException('Could not obtain the file size');
        }
        $ifp = fopen($inputFile, 'rb');
        if (!is_resource($ifp)) {
            throw new SodiumException('Could not open input file for reading');
        }
        $ofp = fopen($outputFile, 'wb');
        if (!is_resource($ofp)) {
            fclose($ifp);
            throw new SodiumException('Could not open output file for writing');
        }
        $res = self::secretbox_encrypt($ifp, $ofp, $size, $nonce, $key);
        fclose($ifp);
        fclose($ofp);
        return $res;
    }
    public static function secretbox_open($inputFile, $outputFile, $nonce, $key)
    {
        if (!is_string($inputFile)) {
            throw new TypeError('Argument 1 must be a string, ' . gettype($inputFile) . ' given.');
        }
        if (!is_string($outputFile)) {
            throw new TypeError('Argument 2 must be a string, ' . gettype($outputFile) . ' given.');
        }
        if (!is_string($nonce)) {
            throw new TypeError('Argument 3 must be a string, ' . gettype($nonce) . ' given.');
        }
        if (!is_string($key)) {
            throw new TypeError('Argument 4 must be a string, ' . gettype($key) . ' given.');
        }
        if (self::strlen($nonce) !== ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_NONCEBYTES) {
            throw new TypeError('Argument 4 must be CRYPTO_SECRETBOX_NONCEBYTES bytes');
        }
        if (self::strlen($key) !== ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_KEYBYTES) {
            throw new TypeError('Argument 4 must be CRYPTO_SECRETBOXBOX_KEYBYTES bytes');
        }
        $size = filesize($inputFile);
        if (!is_int($size)) {
            throw new SodiumException('Could not obtain the file size');
        }
        $ifp = fopen($inputFile, 'rb');
        if (!is_resource($ifp)) {
            throw new SodiumException('Could not open input file for reading');
        }
        $ofp = fopen($outputFile, 'wb');
        if (!is_resource($ofp)) {
            fclose($ifp);
            throw new SodiumException('Could not open output file for writing');
        }
        $res = self::secretbox_decrypt($ifp, $ofp, $size, $nonce, $key);
        fclose($ifp);
        fclose($ofp);
        try {
            ParagonIE_Sodium_Compat::memzero($key);
        } catch (SodiumException $ex) {
            unset($key);
        }
        return $res;
    }
    public static function sign($filePath, $secretKey)
    {
        if (!is_string($filePath)) {
            throw new TypeError('Argument 1 must be a string, ' . gettype($filePath) . ' given.');
        }
        if (!is_string($secretKey)) {
            throw new TypeError('Argument 2 must be a string, ' . gettype($secretKey) . ' given.');
        }
        if (self::strlen($secretKey) !== ParagonIE_Sodium_Compat::CRYPTO_SIGN_SECRETKEYBYTES) {
            throw new TypeError('Argument 2 must be CRYPTO_SIGN_SECRETKEYBYTES bytes');
        }
        if (PHP_INT_SIZE === 4) {
            return self::sign_core32($filePath, $secretKey);
        }
        $size = filesize($filePath);
        if (!is_int($size)) {
            throw new SodiumException('Could not obtain the file size');
        }
        $fp = fopen($filePath, 'rb');
        if (!is_resource($fp)) {
            throw new SodiumException('Could not open input file for reading');
        }
        $az = hash('sha512', self::substr($secretKey, 0, 32), true);
        $az[0] = self::intToChr(self::chrToInt($az[0]) & 248);
        $az[31] = self::intToChr(self::chrToInt($az[31]) & 63 | 64);
        $hs = hash_init('sha512');
        hash_update($hs, self::substr($az, 32, 32));
        $hs = self::updateHashWithFile($hs, $fp, $size);
        $nonceHash = hash_final($hs, true);
        $pk = self::substr($secretKey, 32, 32);
        $nonce = ParagonIE_Sodium_Core_Ed25519::sc_reduce($nonceHash) . self::substr($nonceHash, 32);
        $sig = ParagonIE_Sodium_Core_Ed25519::ge_p3_tobytes(ParagonIE_Sodium_Core_Ed25519::ge_scalarmult_base($nonce));
        $hs = hash_init('sha512');
        hash_update($hs, self::substr($sig, 0, 32));
        hash_update($hs, self::substr($pk, 0, 32));
        $hs = self::updateHashWithFile($hs, $fp, $size);
        $hramHash = hash_final($hs, true);
        $hram = ParagonIE_Sodium_Core_Ed25519::sc_reduce($hramHash);
        $sigAfter = ParagonIE_Sodium_Core_Ed25519::sc_muladd($hram, $az, $nonce);
        $sig = self::substr($sig, 0, 32) . self::substr($sigAfter, 0, 32);
        try {
            ParagonIE_Sodium_Compat::memzero($az);
        } catch (SodiumException $ex) {
            $az = null;
        }
        fclose($fp);
        return $sig;
    }
    public static function verify($sig, $filePath, $publicKey)
    {
        if (!is_string($sig)) {
            throw new TypeError('Argument 1 must be a string, ' . gettype($sig) . ' given.');
        }
        if (!is_string($filePath)) {
            throw new TypeError('Argument 2 must be a string, ' . gettype($filePath) . ' given.');
        }
        if (!is_string($publicKey)) {
            throw new TypeError('Argument 3 must be a string, ' . gettype($publicKey) . ' given.');
        }
        if (self::strlen($sig) !== ParagonIE_Sodium_Compat::CRYPTO_SIGN_BYTES) {
            throw new TypeError('Argument 1 must be CRYPTO_SIGN_BYTES bytes');
        }
        if (self::strlen($publicKey) !== ParagonIE_Sodium_Compat::CRYPTO_SIGN_PUBLICKEYBYTES) {
            throw new TypeError('Argument 3 must be CRYPTO_SIGN_PUBLICKEYBYTES bytes');
        }
        if (self::strlen($sig) < 64) {
            throw new SodiumException('Signature is too short');
        }
        if (PHP_INT_SIZE === 4) {
            return self::verify_core32($sig, $filePath, $publicKey);
        }
        if (ParagonIE_Sodium_Core_Ed25519::chrToInt($sig[63]) & 240 && ParagonIE_Sodium_Core_Ed25519::check_S_lt_L(self::substr($sig, 32, 32))) {
            throw new SodiumException('S < L - Invalid signature');
        }
        if (ParagonIE_Sodium_Core_Ed25519::small_order($sig)) {
            throw new SodiumException('Signature is on too small of an order');
        }
        if ((self::chrToInt($sig[63]) & 224) !== 0) {
            throw new SodiumException('Invalid signature');
        }
        $d = 0;
        for ($i = 0; $i < 32; ++$i) {
            $d |= self::chrToInt($publicKey[$i]);
        }
        if ($d === 0) {
            throw new SodiumException('All zero public key');
        }
        $size = filesize($filePath);
        if (!is_int($size)) {
            throw new SodiumException('Could not obtain the file size');
        }
        $fp = fopen($filePath, 'rb');
        if (!is_resource($fp)) {
            throw new SodiumException('Could not open input file for reading');
        }
        $orig = ParagonIE_Sodium_Compat::$fastMult;
        ParagonIE_Sodium_Compat::$fastMult = true;
        $A = ParagonIE_Sodium_Core_Ed25519::ge_frombytes_negate_vartime($publicKey);
        $hs = hash_init('sha512');
        hash_update($hs, self::substr($sig, 0, 32));
        hash_update($hs, self::substr($publicKey, 0, 32));
        $hs = self::updateHashWithFile($hs, $fp, $size);
        $hDigest = hash_final($hs, true);
        $h = ParagonIE_Sodium_Core_Ed25519::sc_reduce($hDigest) . self::substr($hDigest, 32);
        $R = ParagonIE_Sodium_Core_Ed25519::ge_double_scalarmult_vartime($h, $A, self::substr($sig, 32));
        $rcheck = ParagonIE_Sodium_Core_Ed25519::ge_tobytes($R);
        fclose($fp);
        ParagonIE_Sodium_Compat::$fastMult = $orig;
        return self::verify_32($rcheck, self::substr($sig, 0, 32));
    }
    protected static function box_encrypt($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($boxKeypair)));
    }
    protected static function box_decrypt($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($boxKeypair)));
    }
    protected static function secretbox_encrypt($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('Could not read input file');
        }
        $first32 = self::ftell($ifp);
        $subkey = ParagonIE_Sodium_Core_HSalsa20::hsalsa20($nonce, $key);
        $realNonce = ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8);
        $block0 = str_repeat("\0", 32);
        $mlen0 = $mlen;
        if ($mlen0 > 64 - ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES) {
            $mlen0 = 64 - ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES;
        }
        $block0 .= ParagonIE_Sodium_Core_Util::substr($plaintext, 0, $mlen0);
        $block0 = ParagonIE_Sodium_Core_Salsa20::salsa20_xor($block0, $realNonce, $subkey);
        $state = new ParagonIE_Sodium_Core_Poly1305_State(ParagonIE_Sodium_Core_Util::substr($block0, 0, ParagonIE_Sodium_Crypto::onetimeauth_poly1305_KEYBYTES));
        $start = self::ftell($ofp);
        fwrite($ofp, str_repeat("\0", 16));
        $cBlock = ParagonIE_Sodium_Core_Util::substr($block0, ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES);
        $state->update($cBlock);
        fwrite($ofp, $cBlock);
        $mlen -= 32;
        $iter = 1;
        $incr = self::BUFFER_SIZE >> 6;
        fseek($ifp, $first32, SEEK_SET);
        while ($mlen > 0) {
            $blockSize = $mlen > self::BUFFER_SIZE ? self::BUFFER_SIZE : $mlen;
            $plaintext = fread($ifp, $blockSize);
            if (!is_string($plaintext)) {
                throw new SodiumException('Could not read input file');
            }
            $cBlock = ParagonIE_Sodium_Core_Salsa20::salsa20_xor_ic($plaintext, $realNonce, $iter, $subkey);
            fwrite($ofp, $cBlock, $blockSize);
            $state->update($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);
        fseek($ofp, $start, SEEK_SET);
        fwrite($ofp, $state->finish(), ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_MACBYTES);
        fseek($ofp, $end, SEEK_SET);
        unset($state);
        return true;
    }
    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('Could not read input file');
        }
        $subkey = ParagonIE_Sodium_Core_HSalsa20::hsalsa20($nonce, $key);
        $realNonce = ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8);
        $block0 = ParagonIE_Sodium_Core_Salsa20::salsa20(64, ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8), $subkey);
        $state = new ParagonIE_Sodium_Core_Poly1305_State(self::substr($block0, 0, 32));
        if (!self::onetimeauth_verify($state, $ifp, $tag, $mlen)) {
            throw new SodiumException('Invalid MAC');
        }
        $first32 = fread($ifp, 32);
        if (!is_string($first32)) {
            throw new SodiumException('Could not read input file');
        }
        $first32len = self::strlen($first32);
        fwrite($ofp, self::xorStrings(self::substr($block0, 32, $first32len), self::substr($first32, 0, $first32len)));
        $mlen -= 32;
        $iter = 1;
        $incr = self::BUFFER_SIZE >> 6;
        while ($mlen > 0) {
            $blockSize = $mlen > self::BUFFER_SIZE ? self::BUFFER_SIZE : $mlen;
            $ciphertext = fread($ifp, $blockSize);
            if (!is_string($ciphertext)) {
                throw new SodiumException('Could not read input file');
            }
            $pBlock = ParagonIE_Sodium_Core_Salsa20::salsa20_xor_ic($ciphertext, $realNonce, $iter, $subkey);
            fwrite($ofp, $pBlock, $blockSize);
            $mlen -= $blockSize;
            $iter += $incr;
        }
        return true;
    }
    protected static function onetimeauth_verify(ParagonIE_Sodium_Core_Poly1305_State $state, $ifp, $tag = '', $mlen = 0)
    {
        $pos = self::ftell($ifp);
        $iter = 1;
        $incr = self::BUFFER_SIZE >> 6;
        while ($mlen > 0) {
            $blockSize = $mlen > self::BUFFER_SIZE ? self::BUFFER_SIZE : $mlen;
            $ciphertext = fread($ifp, $blockSize);
            if (!is_string($ciphertext)) {
                throw new SodiumException('Could not read input file');
            }
            $state->update($ciphertext);
            $mlen -= $blockSize;
            $iter += $incr;
        }
        $res = ParagonIE_Sodium_Core_Util::verify_16($tag, $state->finish());
        fseek($ifp, $pos, SEEK_SET);
        return $res;
    }
    public static function updateHashWithFile($hash, $fp, $size = 0)
    {
        if (PHP_VERSION_ID < 70200) {
            if (!is_resource($hash)) {
                throw new TypeError('Argument 1 must be a resource, ' . gettype($hash) . ' given.');
            }
        } else {
            if (!is_object($hash)) {
                throw new TypeError('Argument 1 must be an object (PHP 7.2+), ' . gettype($hash) . ' given.');
            }
        }
        if (!is_resource($fp)) {
            throw new TypeError('Argument 2 must be a resource, ' . gettype($fp) . ' given.');
        }
        if (!is_int($size)) {
            throw new TypeError('Argument 3 must be an integer, ' . gettype($size) . ' given.');
        }
        $originalPosition = self::ftell($fp);
        fseek($fp, 0, SEEK_SET);
        for ($i = 0; $i < $size; $i += self::BUFFER_SIZE) {
            $message = fread($fp, $size - $i > self::BUFFER_SIZE ? $size - $i : self::BUFFER_SIZE);
            if (!is_string($message)) {
                throw new SodiumException('Unexpected error reading from file.');
            }
            hash_update($hash, $message);
        }
        fseek($fp, $originalPosition, SEEK_SET);
        return $hash;
    }
    private static function sign_core32($filePath, $secretKey)
    {
        $size = filesize($filePath);
        if (!is_int($size)) {
            throw new SodiumException('Could not obtain the file size');
        }
        $fp = fopen($filePath, 'rb');
        if (!is_resource($fp)) {
            throw new SodiumException('Could not open input file for reading');
        }
        $az = hash('sha512', self::substr($secretKey, 0, 32), true);
        $az[0] = self::intToChr(self::chrToInt($az[0]) & 248);
        $az[31] = self::intToChr(self::chrToInt($az[31]) & 63 | 64);
        $hs = hash_init('sha512');
        hash_update($hs, self::substr($az, 32, 32));
        $hs = self::updateHashWithFile($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));
        $hs = hash_init('sha512');
        hash_update($hs, self::substr($sig, 0, 32));
        hash_update($hs, self::substr($pk, 0, 32));
        $hs = self::updateHashWithFile($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);
        $sig = self::substr($sig, 0, 32) . self::substr($sigAfter, 0, 32);
        try {
            ParagonIE_Sodium_Compat::memzero($az);
        } catch (SodiumException $ex) {
            $az = null;
        }
        fclose($fp);
        return $sig;
    }
    public static function verify_core32($sig, $filePath, $publicKey)
    {
        if (ParagonIE_Sodium_Core32_Ed25519::check_S_lt_L(self::substr($sig, 32, 32))) {
            throw new SodiumException('S < L - Invalid signature');
        }
        if (ParagonIE_Sodium_Core32_Ed25519::small_order($sig)) {
            throw new SodiumException('Signature is on too small of an order');
        }
        if ((self::chrToInt($sig[63]) & 224) !== 0) {
            throw new SodiumException('Invalid signature');
        }
        $d = 0;
        for ($i = 0; $i < 32; ++$i) {
            $d |= self::chrToInt($publicKey[$i]);
        }
        if ($d === 0) {
            throw new SodiumException('All zero public key');
        }
        $size = filesize($filePath);
        if (!is_int($size)) {
            throw new SodiumException('Could not obtain the file size');
        }
        $fp = fopen($filePath, 'rb');
        if (!is_resource($fp)) {
            throw new SodiumException('Could not open input file for reading');
        }
        $orig = ParagonIE_Sodium_Compat::$fastMult;
        ParagonIE_Sodium_Compat::$fastMult = true;
        $A = ParagonIE_Sodium_Core32_Ed25519::ge_frombytes_negate_vartime($publicKey);
        $hs = hash_init('sha512');
        hash_update($hs, self::substr($sig, 0, 32));
        hash_update($hs, self::substr($publicKey, 0, 32));
        $hs = self::updateHashWithFile($hs, $fp, $size);
        $hDigest = hash_final($hs, true);
        $h = ParagonIE_Sodium_Core32_Ed25519::sc_reduce($hDigest) . self::substr($hDigest, 32);
        $R = ParagonIE_Sodium_Core32_Ed25519::ge_double_scalarmult_vartime($h, $A, self::substr($sig, 32));
        $rcheck = ParagonIE_Sodium_Core32_Ed25519::ge_tobytes($R);
        fclose($fp);
        ParagonIE_Sodium_Compat::$fastMult = $orig;
        return self::verify_32($rcheck, self::substr($sig, 0, 32));
    }
    protected static function secretbox_encrypt_core32($ifp, $ofp, $mlen, $nonce, $key)
    {
        $plaintext = fread($ifp, 32);
        if (!is_string($plaintext)) {
            throw new SodiumException('Could not read input file');
        }
        $first32 = self::ftell($ifp);
        $subkey = ParagonIE_Sodium_Core32_HSalsa20::hsalsa20($nonce, $key);
        $realNonce = ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8);
        $block0 = str_repeat("\0", 32);
        $mlen0 = $mlen;
        if ($mlen0 > 64 - ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES) {
            $mlen0 = 64 - ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES;
        }
        $block0 .= ParagonIE_Sodium_Core32_Util::substr($plaintext, 0, $mlen0);
        $block0 = ParagonIE_Sodium_Core32_Salsa20::salsa20_xor($block0, $realNonce, $subkey);
        $state = new ParagonIE_Sodium_Core32_Poly1305_State(ParagonIE_Sodium_Core32_Util::substr($block0, 0, ParagonIE_Sodium_Crypto::onetimeauth_poly1305_KEYBYTES));
        $start = self::ftell($ofp);
        fwrite($ofp, str_repeat("\0", 16));
        $cBlock = ParagonIE_Sodium_Core32_Util::substr($block0, ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES);
        $state->update($cBlock);
        fwrite($ofp, $cBlock);
        $mlen -= 32;
        $iter = 1;
        $incr = self::BUFFER_SIZE >> 6;
        fseek($ifp, $first32, SEEK_SET);
        while ($mlen > 0) {
            $blockSize = $mlen > self::BUFFER_SIZE ? self::BUFFER_SIZE : $mlen;
            $plaintext = fread($ifp, $blockSize);
            if (!is_string($plaintext)) {
                throw new SodiumException('Could not read input file');
            }
            $cBlock = ParagonIE_Sodium_Core32_Salsa20::salsa20_xor_ic($plaintext, $realNonce, $iter, $subkey);
            fwrite($ofp, $cBlock, $blockSize);
            $state->update($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);
        fseek($ofp, $start, SEEK_SET);
        fwrite($ofp, $state->finish(), ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_MACBYTES);
        fseek($ofp, $end, SEEK_SET);
        unset($state);
        return true;
    }
    protected static function secretbox_decrypt_core32($ifp, $ofp, $mlen, $nonce, $key)
    {
        $tag = fread($ifp, 16);
        if (!is_string($tag)) {
            throw new SodiumException('Could not read input file');
        }
        $subkey = ParagonIE_Sodium_Core32_HSalsa20::hsalsa20($nonce, $key);
        $realNonce = ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8);
        $block0 = ParagonIE_Sodium_Core32_Salsa20::salsa20(64, ParagonIE_Sodium_Core32_Util::substr($nonce, 16, 8), $subkey);
        $state = new ParagonIE_Sodium_Core32_Poly1305_State(self::substr($block0, 0, 32));
        if (!self::onetimeauth_verify_core32($state, $ifp, $tag, $mlen)) {
            throw new SodiumException('Invalid MAC');
        }
        $first32 = fread($ifp, 32);
        if (!is_string($first32)) {
            throw new SodiumException('Could not read input file');
        }
        $first32len = self::strlen($first32);
        fwrite($ofp, self::xorStrings(self::substr($block0, 32, $first32len), self::substr($first32, 0, $first32len)));
        $mlen -= 32;
        $iter = 1;
        $incr = self::BUFFER_SIZE >> 6;
        while ($mlen > 0) {
            $blockSize = $mlen > self::BUFFER_SIZE ? self::BUFFER_SIZE : $mlen;
            $ciphertext = fread($ifp, $blockSize);
            if (!is_string($ciphertext)) {
                throw new SodiumException('Could not read input file');
            }
            $pBlock = ParagonIE_Sodium_Core32_Salsa20::salsa20_xor_ic($ciphertext, $realNonce, $iter, $subkey);
            fwrite($ofp, $pBlock, $blockSize);
            $mlen -= $blockSize;
            $iter += $incr;
        }
        return true;
    }
    protected static function onetimeauth_verify_core32(ParagonIE_Sodium_Core32_Poly1305_State $state, $ifp, $tag = '', $mlen = 0)
    {
        $pos = self::ftell($ifp);
        $iter = 1;
        $incr = self::BUFFER_SIZE >> 6;
        while ($mlen > 0) {
            $blockSize = $mlen > self::BUFFER_SIZE ? self::BUFFER_SIZE : $mlen;
            $ciphertext = fread($ifp, $blockSize);
            if (!is_string($ciphertext)) {
                throw new SodiumException('Could not read input file');
            }
            $state->update($ciphertext);
            $mlen -= $blockSize;
            $iter += $incr;
        }
        $res = ParagonIE_Sodium_Core32_Util::verify_16($tag, $state->finish());
        fseek($ifp, $pos, SEEK_SET);
        return $res;
    }
    private static function ftell($resource)
    {
        $return = ftell($resource);
        if (!is_int($return)) {
            throw new SodiumException('ftell() returned false');
        }
        return (int) $return;
    }
}