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Merge pull request #273 from sarciszewski/patch-1

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Make Util/KeyAlgorithm/DefaultAlgorithm guarantee $len bytes of output even in edge cases.
This commit is contained in:
Alex Bilbie 2014-12-09 12:53:04 +00:00
commit 0ce7ecb45a
1 changed files with 13 additions and 13 deletions
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12
src/Util/KeyAlgorithm/DefaultAlgorithm.php
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@ -18,10 +18,9 @@ class DefaultAlgorithm implements KeyAlgorithmInterface
*/
public function generate($len = 40)
{
// We generate twice as many bytes here because we want to ensure we have
// enough after we base64 encode it to get the length we need because we
// take out the "/", "+", and "=" characters.
$bytes = openssl_random_pseudo_bytes($len * 2, $strong);
$stripped = '';
do {
$bytes = openssl_random_pseudo_bytes($len, $strong);
// We want to stop execution if the key fails because, well, that is bad.
if ($bytes === false || $strong === false) {
@ -29,7 +28,8 @@ class DefaultAlgorithm implements KeyAlgorithmInterface
throw new \Exception('Error Generating Key');
// @codeCoverageIgnoreEnd
}
return substr(str_replace(['/', '+', '='], '', base64_encode($bytes)), 0, $len);
$stripped .= str_replace(['/', '+', '='], '', base64_encode($bytes));
} while (strlen($stripped) < $len);
return substr($stripped, 0, $len);
}
}