pub fn verify(
) -> Result<(), Unspecified>
Verifies that a previously-derived (e.g., using
derive) PBKDF2 value
matches the PBKDF2 value derived from the other inputs.
The comparison is done in constant time to prevent timing attacks. The
comparison will fail if
previously_derived is empty (has a length of
|Parameter||RFC 2898 Section 5.2 Term|
|digest_alg||PRF (HMAC with the given digest algorithm).|
|c (iteration count)|
|dk (derived key)|
|dkLen (derived key length)|
verify panics if
out.len() is larger than (2**32 - 1) * the digest
algorithm's output length, per the PBKDF2 specification.