To answer my first question, the work factor can be extracted from the hash. It is stored as a 2-digit decimal number in the fifth and sixth bytes of the hash.

To answer my first question, the work factor can be extracted from the hash. It is stored as a 2-digit decimal number in the fifth and sixth bytes of the hash. See http://code.google.com/p/py-bcrypt/source/browse/bcrypt/bcrypt.c#141 http://code.google.com/p/py-bcrypt/source/browse/bcrypt/bcry...