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...e run into a problem with the prefix of bcrypt-hashed passwords. Our generated hash values include the prefix $2b$, but our crypt library rejects these, only accepting hash formats with the prefix $2a$. Our current bcrypt java library (http://www.mindrot.org/projects/jBCrypt also https://github.com/jeremyh/jBCrypt) uses the modular crypt format (http://pythonhosted.org/passlib/modular_crypt_format.html) to store both the salt and the hash of the password. The python library we have selected uses bcrypt.c. In (http://www.openwall.com/lists/oss-security/2012/01/02/4), 'Alexander' describes that...