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