password-hash: use Salt type with PasswordHasher#1187
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Previously `PasswordHash::hash_password` and `PasswordHash::generate` took `&str` for `Salt`, however this is a bit of a confusing API because the first thing it does is attempt to convert to a `Salt` which upholds several invariants including "B64" encoding. This change makes the `Salt` parameter explicit so it's clear what type is responsible for checking those invariants.
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Previously
PasswordHash::hash_passwordandPasswordHash::generatetook&strforSalt, however this is a bit of a confusing API because the first thing it does is attempt to convert to aSaltwhich upholds several invariants including "B64" encoding.This change makes the
Saltparameter explicit so it's clear what type is responsible for checking those invariants.Closes #1029.