Make use of timing-safe functions to compare HMAC signatures #329
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Basic string comparisons are not timing-safe for validating HMAC signatures. PHP has a built in function (
hash_equals) that is timing-safe.There are parts of the official Help Scout documentation that should be updated to make use of constant-time string comparisons for validating signatures.
https://developer.helpscout.com/webhooks/
https://developer.helpscout.com/apps/guides/signature-validation/