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<?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, #[\SensitiveParameter] $keyPair ) { /* Type checks: */ if (!is_string($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, #[\SensitiveParameter] $keypair ) { /* Type checks: */ if (!is_string($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($keypair) !== ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES) { throw new TypeError('Argument 4 must be CRYPTO_BOX_KEYPAIRBYTES bytes'); } if (!file_exists($inputFile)) { throw new SodiumException('Input file does not exist'); } /** @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 $ex) { if (isset($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('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'); } if (!file_exists($inputFile)) { throw new SodiumException('Input file does not exist'); } /** @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 $ex) { /** @psalm-suppress PossiblyUndefinedVariable */ unset($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('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); if (!file_exists($inputFile)) { throw new SodiumException('Input file does not exist'); } /** @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 $ex) { if (isset($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 = '', $outputLength = 32 ) { /* Type checks: */ if (!is_string($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'); } if (!file_exists($filePath)) { throw new SodiumException('File does not exist'); } /** @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, #[\SensitiveParameter] $key ) { /* Type checks: */ if (!is_string($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($key) !== ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_KEYBYTES) { throw new TypeError('Argument 4 must be CRYPTO_SECRETBOX_KEYBYTES bytes'); } if (!file_exists($inputFile)) { throw new SodiumException('Input file does not exist'); } /** @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, #[\SensitiveParameter] $key ) { /* Type checks: */ if (!is_string($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 3 must be CRYPTO_SECRETBOX_NONCEBYTES bytes'); } if (self::strlen($key) !== ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_KEYBYTES) { throw new TypeError('Argument 4 must be CRYPTO_SECRETBOX_KEYBYTES bytes'); } if (!file_exists($inputFile)) { throw new SodiumException('Input file does not exist'); } /** @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 $ex) { /** @psalm-suppress PossiblyUndefinedVariable */ unset($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('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, $secretKey); } if (!file_exists($filePath)) { throw new SodiumException('File does not exist'); } /** @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); $hs = hash_init('sha512'); self::hash_update($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) ); $hs = hash_init('sha512'); self::hash_update($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('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, $publicKey); } /* Security checks */ if ( (ParagonIE_Sodium_Core_Ed25519::chrToInt($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'); } if (!file_exists($filePath)) { throw new SodiumException('File does not exist'); } /** @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; if (ParagonIE_Sodium_Core_Ed25519::small_order($publicKey)) { throw new SodiumException('Public key has small order'); } /** @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('Public key is not on a member of the main subgroup'); } $hs = hash_init('sha512'); self::hash_update($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('Could not read input file'); } $first32 = self::ftell($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("\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 $start = self::ftell($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; } $end = self::ftell($ofp); /* * Write the Poly1305 authentication tag that provides integrity * over the ciphertext (encrypt-then-MAC) */ fseek($ofp, $start, SEEK_SET); fwrite($ofp, $state->finish(), ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_MACBYTES); fseek($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 */ $pos = self::ftell($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|HashContext $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 */ $originalPosition = self::ftell($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 $message */ /** @psalm-suppress InvalidArgument */ self::hash_update($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) { $size = filesize($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'); } /** @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); $hs = hash_init('sha512'); self::hash_update($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) ); $hs = hash_init('sha512'); self::hash_update($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('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); $hs = hash_init('sha512'); self::hash_update($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('Could not read input file'); } $first32 = self::ftell($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("\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 $start = self::ftell($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; } $end = self::ftell($ofp); /* * Write the Poly1305 authentication tag that provides integrity * over the ciphertext (encrypt-then-MAC) */ fseek($ofp, $start, SEEK_SET); fwrite($ofp, $state->finish(), ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_MACBYTES); fseek($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 */ $pos = self::ftell($ifp); 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; } $res = ParagonIE_Sodium_Core32_Util::verify_16($tag, $state->finish()); fseek($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('ftell() returned false'); } return (int) $return; } }

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