úÎ(Ž'Ð    None >A hashing policy defines the type of password hashing to use. IPreferred cost - how strong new passwords should be. This is a trade-off  between making hasing /6 checking passwords faster in your system, and making 4 brute forcing passwords harder for an adversary. H The intention is that this can be increased as computers get faster. = To give a rough indication of the scale of preferredCost, K on a 2.6 GHz AMD Athlon machine (64 bit kernel), using a single core:   Cost 4: 139 passwords / second  Cost 5: 85 passwords / second  Cost 6: 44 passwords / second  Cost 7: 23 passwords / second  Cost 8: 11 passwords / second  Cost 9: 5.7 passwords / second  Cost 10: 2.8 passwords / second  Cost 11: 1.4 passwords / second  Cost 12: 0.72 passwords / second EPreferred algorithm - the preferred hash algorithm. $2y$ for bcrypt. +Hashes a password, using a hashing policy. OValidates a password. The first argument is the hashed password, the second is  the password attempt. Q Note: If a password validates successfully, it is a good idea to check if the P password is up to the current policy using hashUsesPolicy, and re-hashing it  if not. MA policy that allows passwords to be hashed reasonably quickly, but for that  reason isn'+t suitable for high security applications. @A policy which makes password hashing substantially slower than O fastBcryptHashingPolicy, and so makes it more difficult for an adversary to L decrypt passwords. In a high security environment, this policy should be 5 regularly reviewed against hardware developments. KCheck whether a password hash is consistent with the current policy, or if  it should be updated. JHashes a password (first argument) using the settings specified in second P argument. The settings describe the hashing variant and salt to use; because R the settings are prepended to password hashes, passing in an existing password 7 hash will cause the same settings to be used again. ( You can create a hash using genSalt. H Result: Just hash on success, Nothing on failure (invalid settings). HPrepares a settings string and salt suitable for use with hashPassword. I Takes a prefix specifying the type of hash, an integer specifying the G computational cost of hashing (4-32, or 0 for a low default), and a  string of random entropy. LGenerates a salt using a policy, sampling from a system-appropriate source.             bcrypt-0.0.4 Crypto.BCrypt HashingPolicypreferredHashCostpreferredHashAlgorithmhashPasswordUsingPolicyvalidatePasswordfastBcryptHashingPolicyslowerBcryptHashingPolicyhashUsesPolicy hashPasswordgenSaltgenSaltUsingPolicyc_crypt_gensalt_ra c_crypt_ra