symfony/symfony — pull request #11822 by dunglas (2014-09-01 22:43:44+00:00)
Title: [Security] Use hash_equals for constant-time string comparison (again)

| Q | A
| ------------- | ---
| Bug fix? | no
| New feature? | no
| BC breaks? | no
| Deprecations? | no
| Tests pass? | yes
| Fixed tickets | n/a
| License | MIT
| Doc PR | n/a

Use the `hash_equals` function (introduced in PHP 5.6) for timing attack safe string comparison when available.
Add in the DocBlock that length will leak (https://github.com/symfony/symfony/pull/11797#issuecomment-53990712).