--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/sodium_compat/src/File.php Mon Oct 14 18:28:13 2019 +0200
@@ -0,0 +1,1543 @@
+<?php
+
+if (class_exists('ParagonIE_Sodium_File', false)) {
+ return;
+}
+/**
+ * Class ParagonIE_Sodium_File
+ */
+class ParagonIE_Sodium_File extends ParagonIE_Sodium_Core_Util
+{
+ /* PHP'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, $keyPair)
+ {
+ /* Type checks: */
+ if (!is_string($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($nonce) . ' given.');
+ }
+
+ /* Input validation: */
+ if (!is_string($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');
+ }
+
+ /** @var int $size */
+ $size = filesize($inputFile);
+ if (!is_int($size)) {
+ throw new SodiumException('Could not obtain the file size');
+ }
+
+ /** @var resource $ifp */
+ $ifp = fopen($inputFile, 'rb');
+ if (!is_resource($ifp)) {
+ throw new SodiumException('Could not open input file for reading');
+ }
+
+ /** @var resource $ofp */
+ $ofp = fopen($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;
+ }
+
+ /**
+ * 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, $keypair)
+ {
+ /* Type checks: */
+ if (!is_string($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($keypair) . ' given.');
+ }
+
+ /* Input validation: */
+ if (self::strlen($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');
+ }
+
+ /** @var int $size */
+ $size = filesize($inputFile);
+ if (!is_int($size)) {
+ throw new SodiumException('Could not obtain the file size');
+ }
+
+ /** @var resource $ifp */
+ $ifp = fopen($inputFile, 'rb');
+ if (!is_resource($ifp)) {
+ throw new SodiumException('Could not open input file for reading');
+ }
+
+ /** @var resource $ofp */
+ $ofp = fopen($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 $ex) {
+ unset($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, $publicKey)
+ {
+ /* Type checks: */
+ if (!is_string($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($publicKey) . ' given.');
+ }
+
+ /* Input validation: */
+ if (self::strlen($publicKey) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES) {
+ throw new TypeError('Argument 3 must be CRYPTO_BOX_PUBLICKEYBYTES bytes');
+ }
+
+ /** @var int $size */
+ $size = filesize($inputFile);
+ if (!is_int($size)) {
+ throw new SodiumException('Could not obtain the file size');
+ }
+
+ /** @var resource $ifp */
+ $ifp = fopen($inputFile, 'rb');
+ if (!is_resource($ifp)) {
+ throw new SodiumException('Could not open input file for reading');
+ }
+
+ /** @var resource $ofp */
+ $ofp = fopen($outputFile, 'wb');
+ if (!is_resource($ofp)) {
+ fclose($ifp);
+ throw new SodiumException('Could not open output file for writing');
+ }
+
+ /** @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,
+ '',
+ 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($ephKeypair);
+ throw new SodiumException('Could not write to output file');
+ }
+ if ($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;
+ }
+
+ /**
+ * 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, $ecdhKeypair)
+ {
+ /* Type checks: */
+ if (!is_string($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($ecdhKeypair) . ' given.');
+ }
+
+ /* Input validation: */
+ if (self::strlen($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);
+
+ /** @var int $size */
+ $size = filesize($inputFile);
+ if (!is_int($size)) {
+ throw new SodiumException('Could not obtain the file size');
+ }
+
+ /** @var resource $ifp */
+ $ifp = fopen($inputFile, 'rb');
+ if (!is_resource($ifp)) {
+ throw new SodiumException('Could not open input file for reading');
+ }
+
+ /** @var resource $ofp */
+ $ofp = fopen($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 $ex) {
+ unset($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, $key = '', $outputLength = 32)
+ {
+ /* Type checks: */
+ if (!is_string($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) $outputLength;
+ }
+
+ /* Input validation: */
+ if (!empty($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');
+ }
+
+ /** @var int $size */
+ $size = filesize($filePath);
+ if (!is_int($size)) {
+ throw new SodiumException('Could not obtain the file size');
+ }
+
+ /** @var resource $fp */
+ $fp = fopen($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);
+ }
+
+ /**
+ * 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, $key)
+ {
+ /* Type checks: */
+ if (!is_string($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($nonce) . ' given.');
+ }
+
+ /* Input validation: */
+ if (self::strlen($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');
+ }
+
+ /** @var int $size */
+ $size = filesize($inputFile);
+ if (!is_int($size)) {
+ throw new SodiumException('Could not obtain the file size');
+ }
+
+ /** @var resource $ifp */
+ $ifp = fopen($inputFile, 'rb');
+ if (!is_resource($ifp)) {
+ throw new SodiumException('Could not open input file for reading');
+ }
+
+ /** @var resource $ofp */
+ $ofp = fopen($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;
+ }
+ /**
+ * 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, $key)
+ {
+ /* Type checks: */
+ if (!is_string($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($key) . ' given.');
+ }
+
+ /* Input validation: */
+ if (self::strlen($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');
+ }
+
+ /** @var int $size */
+ $size = filesize($inputFile);
+ if (!is_int($size)) {
+ throw new SodiumException('Could not obtain the file size');
+ }
+
+ /** @var resource $ifp */
+ $ifp = fopen($inputFile, 'rb');
+ if (!is_resource($ifp)) {
+ throw new SodiumException('Could not open input file for reading');
+ }
+
+ /** @var resource $ofp */
+ $ofp = fopen($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;
+ }
+
+ /**
+ * 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, $secretKey)
+ {
+ /* Type checks: */
+ if (!is_string($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($secretKey) . ' given.');
+ }
+
+ /* Input validation: */
+ if (self::strlen($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);
+ }
+
+ /** @var int $size */
+ $size = filesize($filePath);
+ if (!is_int($size)) {
+ throw new SodiumException('Could not obtain the file size');
+ }
+
+ /** @var resource $fp */
+ $fp = fopen($filePath, 'rb');
+ if (!is_resource($fp)) {
+ throw new SodiumException('Could not open input file for reading');
+ }
+
+ /** @var string $az */
+ $az = hash('sha512', self::substr($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));
+ /** @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)
+ );
+
+ $hs = hash_init('sha512');
+ hash_update($hs, self::substr($sig, 0, 32));
+ hash_update($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('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($publicKey) . ' given.');
+ }
+
+ /* Input validation: */
+ if (self::strlen($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, $publicKey);
+ }
+
+ /* Security checks */
+ if (ParagonIE_Sodium_Core_Ed25519::check_S_lt_L(self::substr($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');
+ }
+
+ /** @var int $size */
+ $size = filesize($filePath);
+ if (!is_int($size)) {
+ throw new SodiumException('Could not obtain the file size');
+ }
+
+ /** @var resource $fp */
+ $fp = fopen($filePath, 'rb');
+ if (!is_resource($fp)) {
+ throw new SodiumException('Could not open input file for reading');
+ }
+
+ /** @var bool The original value of ParagonIE_Sodium_Compat::$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_Core_Curve25519_Ge_P3 $A */
+ $A = ParagonIE_Sodium_Core_Ed25519::ge_frombytes_negate_vartime($publicKey);
+
+ $hs = hash_init('sha512');
+ hash_update($hs, self::substr($sig, 0, 32));
+ hash_update($hs, self::substr($publicKey, 0, 32));
+ /** @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('Could not read input file');
+ }
+ $first32 = ftell($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("\x00", 32);
+
+ /** @var int $mlen - Length of the plaintext message */
+ $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);
+
+ /** @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
+ $start = ftell($ofp);
+ fwrite($ofp, str_repeat("\x00", 16));
+
+ /** @var string $c */
+ $cBlock = ParagonIE_Sodium_Core_Util::substr(
+ $block0,
+ ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES
+ );
+ $state->update($cBlock);
+ fwrite($ofp, $cBlock);
+ $mlen -= 32;
+
+ /** @var int $iter */
+ $iter = 1;
+
+ /** @var int $incr */
+ $incr = self::BUFFER_SIZE >> 6;
+
+ /*
+ * Set the cursor to the end of the first half-block. All future bytes will
+ * generated from salsa20_xor_ic, starting from 1 (second block).
+ */
+ fseek($ifp, $first32, SEEK_SET);
+
+ while ($mlen > 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;
+ }
+ $end = ftell($ofp);
+
+ /*
+ * Write the Poly1305 authentication tag that provides integrity
+ * over the ciphertext (encrypt-then-MAC)
+ */
+ fseek($ofp, $start, SEEK_SET);
+ fwrite($ofp, $state->finish(), ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_MACBYTES);
+ fseek($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('Could not read input file');
+ }
+
+ /** @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('Invalid MAC');
+ }
+
+ /*
+ * 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('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;
+
+ /** @var int $iter */
+ $iter = 1;
+
+ /** @var int $incr */
+ $incr = self::BUFFER_SIZE >> 6;
+
+ /* Decrypts ciphertext, writes to output file. */
+ while ($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;
+ }
+
+ /**
+ * @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 = '',
+ $mlen = 0
+ ) {
+ /** @var int $pos */
+ $pos = ftell($ifp);
+
+ /** @var int $iter */
+ $iter = 1;
+
+ /** @var int $incr */
+ $incr = self::BUFFER_SIZE >> 6;
+
+ while ($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;
+ }
+
+ /**
+ * Update a hash context with the contents of a file, without
+ * loading the entire file into memory.
+ *
+ * @param resource|object $hash
+ * @param resource $fp
+ * @param int $size
+ * @return resource|object Resource on PHP < 7.2, HashContext object on PHP >= 7.2
+ * @throws SodiumException
+ * @throws TypeError
+ * @psalm-suppress PossiblyInvalidArgument
+ * PHP 7.2 changes from a resource to an object,
+ * which causes Psalm to complain about an error.
+ * @psalm-suppress TypeCoercion
+ * Ditto.
+ */
+ public static function updateHashWithFile($hash, $fp, $size = 0)
+ {
+ /* Type checks: */
+ if (PHP_VERSION_ID < 70200) {
+ if (!is_resource($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.');
+ }
+
+ /** @var int $originalPosition */
+ $originalPosition = ftell($fp);
+
+ // Move file pointer to beginning of file
+ fseek($fp, 0, SEEK_SET);
+ for ($i = 0; $i < $size; $i += self::BUFFER_SIZE) {
+ /** @var string|bool $message */
+ $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.');
+ }
+ /** @var string $message */
+ /** @psalm-suppress InvalidArgument */
+ hash_update($hash, $message);
+ }
+ // Reset file pointer's position
+ fseek($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)
+ {
+ /** @var int|bool $size */
+ $size = filesize($filePath);
+ if (!is_int($size)) {
+ throw new SodiumException('Could not obtain the file size');
+ }
+ /** @var int $size */
+
+ /** @var resource|bool $fp */
+ $fp = fopen($filePath, 'rb');
+ if (!is_resource($fp)) {
+ throw new SodiumException('Could not open input file for reading');
+ }
+ /** @var resource $fp */
+
+ /** @var string $az */
+ $az = hash('sha512', self::substr($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));
+ /** @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 */
+ $nonce = ParagonIE_Sodium_Core32_Ed25519::sc_reduce($nonceHash) . self::substr($nonceHash, 32);
+
+ /** @var string $sig */
+ $sig = ParagonIE_Sodium_Core32_Ed25519::ge_p3_tobytes(
+ ParagonIE_Sodium_Core32_Ed25519::ge_scalarmult_base($nonce)
+ );
+
+ $hs = hash_init('sha512');
+ hash_update($hs, self::substr($sig, 0, 32));
+ hash_update($hs, self::substr($pk, 0, 32));
+ /** @var resource $hs */
+ $hs = self::updateHashWithFile($hs, $fp, $size);
+
+ /** @var string $hramHash */
+ $hramHash = hash_final($hs, true);
+
+ /** @var string $hram */
+ $hram = ParagonIE_Sodium_Core32_Ed25519::sc_reduce($hramHash);
+
+ /** @var string $sigAfter */
+ $sigAfter = ParagonIE_Sodium_Core32_Ed25519::sc_muladd($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('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');
+ }
+
+ /** @var int|bool $size */
+ $size = filesize($filePath);
+ if (!is_int($size)) {
+ throw new SodiumException('Could not obtain the file size');
+ }
+ /** @var int $size */
+
+ /** @var resource|bool $fp */
+ $fp = fopen($filePath, 'rb');
+ if (!is_resource($fp)) {
+ throw new SodiumException('Could not open input file for reading');
+ }
+ /** @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);
+
+ $hs = hash_init('sha512');
+ hash_update($hs, self::substr($sig, 0, 32));
+ hash_update($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('Could not read input file');
+ }
+ $first32 = ftell($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("\x00", 32);
+
+ /** @var int $mlen - Length of the plaintext message */
+ $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);
+
+ /** @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
+ $start = ftell($ofp);
+ fwrite($ofp, str_repeat("\x00", 16));
+
+ /** @var string $c */
+ $cBlock = ParagonIE_Sodium_Core32_Util::substr(
+ $block0,
+ ParagonIE_Sodium_Crypto::secretbox_xsalsa20poly1305_ZEROBYTES
+ );
+ $state->update($cBlock);
+ fwrite($ofp, $cBlock);
+ $mlen -= 32;
+
+ /** @var int $iter */
+ $iter = 1;
+
+ /** @var int $incr */
+ $incr = self::BUFFER_SIZE >> 6;
+
+ /*
+ * Set the cursor to the end of the first half-block. All future bytes will
+ * generated from salsa20_xor_ic, starting from 1 (second block).
+ */
+ fseek($ifp, $first32, SEEK_SET);
+
+ while ($mlen > 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;
+ }
+ $end = ftell($ofp);
+
+ /*
+ * Write the Poly1305 authentication tag that provides integrity
+ * over the ciphertext (encrypt-then-MAC)
+ */
+ fseek($ofp, $start, SEEK_SET);
+ fwrite($ofp, $state->finish(), ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_MACBYTES);
+ fseek($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('Could not read input file');
+ }
+
+ /** @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('Invalid MAC');
+ }
+
+ /*
+ * 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('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;
+
+ /** @var int $iter */
+ $iter = 1;
+
+ /** @var int $incr */
+ $incr = self::BUFFER_SIZE >> 6;
+
+ /* Decrypts ciphertext, writes to output file. */
+ while ($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;
+ }
+
+ /**
+ * 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 = '',
+ $mlen = 0
+ ) {
+ /** @var int $pos */
+ $pos = ftell($ifp);
+
+ /** @var int $iter */
+ $iter = 1;
+
+ /** @var int $incr */
+ $incr = self::BUFFER_SIZE >> 6;
+
+ while ($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;
+ }
+}