biometric encryption

I need to make an efficient approach based on biometrics (Iris or fingerprint) for generation of secure cryptographic key. The proposed approach is composed of three modules namely, 1) Feature extraction, 2) Multimodal biometric template generation and 3) Cryptographic key generation. Initially, the features, minutiae points and texture properties are extracted from the fingerprint or iris images respectively. Subsequently, the extracted features are fused together at the feature level to construct the multi-biometric template. Finally, a 256-bit secure cryptographic key is generated from the biometric [login to view URL] I the key is generated I would want to make an scenario of three way check The steps I wish to have in my checking program are: 1. Measure biometric 2. Claim ID 3. Bio-encrypted key 4. Retrieve key1 from live biometric and bio-encrypted key 5. Retrieve key2 from smartcard biometric and bio-encrypted key 6. Hashed key1, key2 7. Match:Hashed key == Hashed key1== Hashed key2