Function verify_password_with_policy 

pub fn verify_password_with_policy(
    password: &str,
    hash: &str,
    policy: &PasswordHashPolicy,
) -> Result<PasswordHashVerification>

Verifies a password with an explicit policy and reports whether a matching hash needs upgrade.

Errors

Returns an error when the stored PHC string is malformed, unsupported, outside policy’s verification limits, or the Argon2 verifier fails for a reason other than password mismatch.