Rather than answer your question directly, I'm going to dissuade you entirely:
I don't feel biometrics are a suitable replacement for passwords, because things like fingerprints
can easily be duplicated (or sawn off, if necessary). They're of the "something you have" variety of security system, whereas passwords are "something you know" and can easily be changed over time and not easily lifted off someone (Rubberhose cryptography
notwithstanding, but that's what password age, plausible-deniability, and duress-code policies are for, none of these are thing you can do with biometric security).
Fingerprint/biometric security is more of a security theatre: it sure looks impressive to the MBA/PHB-types, especially because of its cliched use as plot-devices in Hollywood, but if you want a proper secure system you should use some kind of two-factor
authentication system. The "know" requirement is easily met with a dictionary attack-proof password and the "have" requirement met by a smartcard or SecureID-esque keyfob.
I'll also mention there are a variety of different ways to read fingerprints, those desktop scanners you can get for under $50 are easy enough to fool. There are also different ways for fingerprint readers to work in a security system: the system could use
a password database which is 'unlocked' via the fingerprint reader (either by looking for a match and using machine-key or user-key symmetric encryption) or one that uses some kind of hash of the fingerprint as key in itself, but for that to work reliably
you need to allow lots of tolerance in your matching algorithm, which makes the reader easier to fool. I'm not an expert on fingerprint recognition, but I stand by my original point that fingerprint security is mostly for show and shouldn't seriously be considered
in a secure system.
One argument for using fingerprint security in low-security environments is convinience, that you can read a fingerprint faster than you can recall and type a password. I'm not buying it, I can type my password in under a half-second (if my hands are already
on my keyboard) so that's got to be moot.