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Fix: generatePKCECodeVerifier length #199

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Merged
ADmad merged 3 commits into from
Aug 28, 2025
Merged

Fix: generatePKCECodeVerifier length #199

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a29858c
- Fixes generatePKCECodeVerifier() to never generate strings < 43 or …
Aug 27, 2025
a34c276
Space
Aug 27, 2025
5dbe1c8
Rename length to byteLength
Aug 28, 2025
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14 changes: 9 additions & 5 deletions src/OAuth2/AbstractProvider.php
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Original file line number Diff line number Diff line change
Expand Up @@ -27,6 +27,8 @@ abstract class AbstractProvider extends AbstractBaseProvider

protected bool $pkce = false;

protected int $pkceCodeVerifierByteLength = 96;

/**
* @return string
*/
Expand All @@ -50,7 +52,7 @@ public function getAuthUrlParameters(): array
$parameters['response_type'] = 'code';

if ($this->pkce) {
$codeVerifier = $this->generatePKCECodeVerifier();
$codeVerifier = $this->generatePKCECodeVerifier($this->pkceCodeVerifierByteLength);
$this->session->set('code_verifier', $codeVerifier);

$parameters['code_challenge'] = $this->generatePKCECodeChallenge($codeVerifier);
Expand All @@ -60,13 +62,15 @@ public function getAuthUrlParameters(): array
return $parameters;
}

private function generatePKCECodeVerifier(int $length = 128)
private function generatePKCECodeVerifier(int $byteLength = 96): string
{
if ($length < 43 || $length > 128) {
throw new \Exception("Length must be between 43 and 128");
if ($byteLength < 32 || $byteLength > 96) {
throw new \Exception(
"Final length must be between 43 and 128, so the number of random bytes must be between 32 and 96"
);
}

$randomBytes = random_bytes($length);
$randomBytes = random_bytes($byteLength);
return rtrim(strtr(base64_encode($randomBytes), '+/', '-_'), '=');
}

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