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<?php namespace PragmaRX\Google2FA\Support; use ParagonIE\ConstantTime\Base32 as ParagonieBase32; use PragmaRX\Google2FA\Exceptions\IncompatibleWithGoogleAuthenticatorException; use PragmaRX\Google2FA\Exceptions\InvalidCharactersException; use PragmaRX\Google2FA\Exceptions\SecretKeyTooShortException; trait Base32 { /** * Enforce Google Authenticator compatibility. / protected $enforceGoogleAuthenticatorCompatibility = true; /* * Calculate char count bits. * * @param string $b32 * * @return int / protected function charCountBits($b32) { return strlen($b32) 8; } /** * Generate a digit secret key in base32 format. * * @param int $length * @param string $prefix * * @throws \Exception * @throws \PragmaRX\Google2FA\Exceptions\InvalidCharactersException * @throws \PragmaRX\Google2FA\Exceptions\SecretKeyTooShortException * @throws \PragmaRX\Google2FA\Exceptions\IncompatibleWithGoogleAuthenticatorException * * @return string / public function generateBase32RandomKey($length = 16, $prefix = '') { $secret = $prefix ? $this->toBase32($prefix) : ''; $secret = $this->strPadBase32($secret, $length); $this->validateSecret($secret); return $secret; } /* * Decodes a base32 string into a binary string. * * @param string $b32 * * @throws \PragmaRX\Google2FA\Exceptions\InvalidCharactersException * @throws \PragmaRX\Google2FA\Exceptions\SecretKeyTooShortException * @throws \PragmaRX\Google2FA\Exceptions\IncompatibleWithGoogleAuthenticatorException * * @return string / public function base32Decode($b32) { $b32 = strtoupper($b32); $this->validateSecret($b32); return ParagonieBase32::decodeUpper($b32); } /* * Check if the string length is power of two. * * @param string $b32 * * @return bool / protected function isCharCountNotAPowerOfTwo($b32) { return (strlen($b32) & (strlen($b32) - 1)) !== 0; } /* * Pad string with random base 32 chars. * * @param string $string * @param int $length * * @throws \Exception * * @return string / private function strPadBase32($string, $length) { for ($i = 0; $i < $length; $i++) { $string .= substr( Constants::VALID_FOR_B32_SCRAMBLED, $this->getRandomNumber(), 1 ); } return $string; } /* * Encode a string to Base32. * * @param string $string * * @return string / public function toBase32($string) { $encoded = ParagonieBase32::encodeUpper($string); return str_replace('=', '', $encoded); } /* * Get a random number. * * @param int $from * @param int $to * * @throws \Exception * * @return int / protected function getRandomNumber($from = 0, $to = 31) { return random_int($from, $to); } /* * Validate the secret. * * @param string $b32 * * @throws \PragmaRX\Google2FA\Exceptions\InvalidCharactersException * @throws \PragmaRX\Google2FA\Exceptions\SecretKeyTooShortException * @throws \PragmaRX\Google2FA\Exceptions\IncompatibleWithGoogleAuthenticatorException / protected function validateSecret($b32) { $this->checkForValidCharacters($b32); $this->checkGoogleAuthenticatorCompatibility($b32); $this->checkIsBigEnough($b32); } /* * Check if the secret key is compatible with Google Authenticator. * * @param string $b32 * * @throws IncompatibleWithGoogleAuthenticatorException / protected function checkGoogleAuthenticatorCompatibility($b32) { if ( $this->enforceGoogleAuthenticatorCompatibility && $this->isCharCountNotAPowerOfTwo($b32) // Google Authenticator requires it to be a power of 2 base32 length string ) { throw new IncompatibleWithGoogleAuthenticatorException(); } } /* * Check if all secret key characters are valid. * * @param string $b32 * * @throws \PragmaRX\Google2FA\Exceptions\InvalidCharactersException / protected function checkForValidCharacters($b32) { if ( preg_replace('/[^'.Constants::VALID_FOR_B32.']/', '', $b32) !== $b32 ) { throw new InvalidCharactersException(); } } /* * Check if secret key length is big enough. * * @param string $b32 * * @throws \PragmaRX\Google2FA\Exceptions\SecretKeyTooShortException */ protected function checkIsBigEnough($b32) { // Minimum = 128 bits // Recommended = 160 bits // Compatible with Google Authenticator = 256 bits if ( $this->charCountBits($b32) < 128 ) { throw new SecretKeyTooShortException(); } } }

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