Function ring::hmac::verify

pub fn verify(key: &Key, data: &[u8], tag: &[u8]) -> Result<(), Unspecified>

Calculates the HMAC of data using the signing key key, and verifies whether the resultant value equals tag, in one step.

This is logically equivalent to, but more efficient than, constructing a Key with the same value as key and then using verify.

The verification will be done in constant time to prevent timing attacks.