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getWindow($window); $startingTimestamp++ ) { if ( hash_equals($this->oathTotp($secret, $startingTimestamp), $key) ) { return is_null($oldTimestamp) ? true : $startingTimestamp; } } return false; } /** * Generate the HMAC OTP. * * @param string $secret * @param int $counter * * @return string */ protected function generateHotp($secret, $counter) { return hash_hmac( $this->getAlgorithm(), pack('N*', 0, $counter), // Counter must be 64-bit int $secret, true ); } /** * Generate a digit secret key in base32 format. * * @param int $length * @param string $prefix * * @throws \PragmaRX\Google2FA\Exceptions\IncompatibleWithGoogleAuthenticatorException * @throws \PragmaRX\Google2FA\Exceptions\InvalidCharactersException * @throws \PragmaRX\Google2FA\Exceptions\SecretKeyTooShortException * * @return string */ public function generateSecretKey($length = 16, $prefix = '') { return $this->generateBase32RandomKey($length, $prefix); } /** * Get the current one time password for a key. * * @param string $secret * * @throws \PragmaRX\Google2FA\Exceptions\SecretKeyTooShortException * @throws \PragmaRX\Google2FA\Exceptions\InvalidCharactersException * @throws \PragmaRX\Google2FA\Exceptions\IncompatibleWithGoogleAuthenticatorException * * @return string */ public function getCurrentOtp($secret) { return $this->oathTotp($secret, $this->getTimestamp()); } /** * Get the HMAC algorithm. * * @return string */ public function getAlgorithm() { return $this->algorithm; } /** * Get key regeneration. * * @return int */ public function getKeyRegeneration() { return $this->keyRegeneration; } /** * Get OTP length. * * @return int */ public function getOneTimePasswordLength() { return $this->oneTimePasswordLength; } /** * Get secret. * * @param string|null $secret * * @return string */ public function getSecret($secret = null) { return is_null($secret) ? $this->secret : $secret; } /** * Returns the current Unix Timestamp divided by the $keyRegeneration * period. * * @return int **/ public function getTimestamp() { return (int) floor(microtime(true) / $this->keyRegeneration); } /** * Get a list of valid HMAC algorithms. * * @return array */ protected function getValidAlgorithms() { return [ Constants::SHA1, Constants::SHA256, Constants::SHA512, ]; } /** * Get the OTP window. * * @param null|int $window * * @return int */ public function getWindow($window = null) { return is_null($window) ? $this->window : $window; } /** * Make a window based starting timestamp. * * @param int|null $window * @param int $timestamp * @param int|null $oldTimestamp * * @return mixed */ private function makeStartingTimestamp($window, $timestamp, $oldTimestamp = null) { return is_null($oldTimestamp) ? $timestamp - $this->getWindow($window) : max($timestamp - $this->getWindow($window), $oldTimestamp + 1); } /** * Get/use a starting timestamp for key verification. * * @param string|int|null $timestamp * * @return int */ protected function makeTimestamp($timestamp = null) { if (is_null($timestamp)) { return $this->getTimestamp(); } return (int) $timestamp; } /** * Takes the secret key and the timestamp and returns the one time * password. * * @param string $secret Secret key in binary form. * @param int $counter Timestamp as returned by getTimestamp. * * @throws \PragmaRX\Google2FA\Exceptions\SecretKeyTooShortException * @throws \PragmaRX\Google2FA\Exceptions\InvalidCharactersException * @throws Exceptions\IncompatibleWithGoogleAuthenticatorException * * @return string */ public function oathTotp($secret, $counter) { if (strlen($secret) < 8) { throw new SecretKeyTooShortException(); } $secret = $this->base32Decode($this->getSecret($secret)); return str_pad( $this->oathTruncate($this->generateHotp($secret, $counter)), $this->getOneTimePasswordLength(), '0', STR_PAD_LEFT ); } /** * Extracts the OTP from the SHA1 hash. * * @param string $hash * * @return string **/ public function oathTruncate($hash) { $offset = ord($hash[strlen($hash) - 1]) & 0xF; $temp = unpack('N', substr($hash, $offset, 4)); $temp = $temp[1] & 0x7FFFFFFF; return substr( (string) $temp, -$this->getOneTimePasswordLength() ); } /** * Remove invalid chars from a base 32 string. * * @param string $string * * @return string|null */ public function removeInvalidChars($string) { return preg_replace( '/[^'.Constants::VALID_FOR_B32.']/', '', $string ); } /** * Setter for the enforce Google Authenticator compatibility property. * * @param mixed $enforceGoogleAuthenticatorCompatibility * * @return $this */ public function setEnforceGoogleAuthenticatorCompatibility( $enforceGoogleAuthenticatorCompatibility ) { $this->enforceGoogleAuthenticatorCompatibility = $enforceGoogleAuthenticatorCompatibility; return $this; } /** * Set the HMAC hashing algorithm. * * @param mixed $algorithm * * @throws \PragmaRX\Google2FA\Exceptions\InvalidAlgorithmException * * @return \PragmaRX\Google2FA\Google2FA */ public function setAlgorithm($algorithm) { // Default to SHA1 HMAC algorithm if (!in_array($algorithm, $this->getValidAlgorithms())) { throw new InvalidAlgorithmException(); } $this->algorithm = $algorithm; return $this; } /** * Set key regeneration. * * @param mixed $keyRegeneration */ public function setKeyRegeneration($keyRegeneration) { $this->keyRegeneration = $keyRegeneration; } /** * Set OTP length. * * @param mixed $oneTimePasswordLength */ public function setOneTimePasswordLength($oneTimePasswordLength) { $this->oneTimePasswordLength = $oneTimePasswordLength; } /** * Set secret. * * @param mixed $secret */ public function setSecret($secret) { $this->secret = $secret; } /** * Set the OTP window. * * @param mixed $window */ public function setWindow($window) { $this->window = $window; } /** * Verifies a user inputted key against the current timestamp. Checks $window * keys either side of the timestamp. * * @param string $key User specified key * @param string $secret * @param null|int $window * @param null|int $timestamp * @param null|int $oldTimestamp * * @throws \PragmaRX\Google2FA\Exceptions\SecretKeyTooShortException * @throws \PragmaRX\Google2FA\Exceptions\InvalidCharactersException * @throws \PragmaRX\Google2FA\Exceptions\IncompatibleWithGoogleAuthenticatorException * * @return bool|int */ public function verify( $key, $secret, $window = null, $timestamp = null, $oldTimestamp = null ) { return $this->verifyKey( $secret, $key, $window, $timestamp, $oldTimestamp ); } /** * Verifies a user inputted key against the current timestamp. Checks $window * keys either side of the timestamp. * * @param string $secret * @param string $key User specified key * @param int|null $window * @param null|int $timestamp * @param null|int $oldTimestamp * * @throws \PragmaRX\Google2FA\Exceptions\SecretKeyTooShortException * @throws \PragmaRX\Google2FA\Exceptions\InvalidCharactersException * @throws \PragmaRX\Google2FA\Exceptions\IncompatibleWithGoogleAuthenticatorException * * @return bool|int */ public function verifyKey( $secret, $key, $window = null, $timestamp = null, $oldTimestamp = null ) { $timestamp = $this->makeTimestamp($timestamp); return $this->findValidOTP( $secret, $key, $window, $this->makeStartingTimestamp($window, $timestamp, $oldTimestamp), $timestamp, $oldTimestamp ); } /** * Verifies a user inputted key against the current timestamp. Checks $window * keys either side of the timestamp, but ensures that the given key is newer than * the given oldTimestamp. Useful if you need to ensure that a single key cannot * be used twice. * * @param string $secret * @param string $key User specified key * @param int|null $oldTimestamp The timestamp from the last verified key * @param int|null $window * @param int|null $timestamp * * @throws \PragmaRX\Google2FA\Exceptions\SecretKeyTooShortException * @throws \PragmaRX\Google2FA\Exceptions\InvalidCharactersException * @throws \PragmaRX\Google2FA\Exceptions\IncompatibleWithGoogleAuthenticatorException * * @return bool|int */ public function verifyKeyNewer( $secret, $key, $oldTimestamp, $window = null, $timestamp = null ) { return $this->verifyKey( $secret, $key, $window, $timestamp, $oldTimestamp ); } }