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View Code? Open in Web Editor NEWA totp library in ts
License: Apache License 2.0
A totp library in ts
License: Apache License 2.0
Hey,
Thanks for writing a totp implementation using webcrypto ๐
Just wanted to let you know in the verifyTOTP function you should use crypto.subtle.verify
to guard against timing attacks.
Right now because of the string comparison it will return false
as soon as a mismatching character is found.
This behavior can be exploited in a timing attack, where an attacker makes multiple verification attempts and measures the time each attempt takes, using the timing information to gradually determine the correct OTP.
Let me know if you need help / input fixing this.
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