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d „ Z RS( sÐ PBKDF2.py : PKCS#5 v2.0 Password-Based Key Derivation
This implementation takes a passphrase and a salt (and optionally an
iteration count, a digest module, and a MAC module) and provides a
file-like object from which an arbitrarily-sized key can be read.
If the passphrase and/or salt are unicode objects, they are encoded as
UTF-8 before they are processed.
The idea behind PBKDF2 is to derive a cryptographic key from a
passphrase and a salt.
PBKDF2 may also be used as a strong salted password hash. The
'crypt' function is provided for that purpose.
Remember: Keys generated using PBKDF2 are only as strong as the
passphrases they are derived from.
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Note that len(obj.hexread(n)) == 2*n.
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| d ƒ S( sº PBKDF2-based unix crypt(3) replacement.
The number of iterations specified in the salt overrides the 'iterations'
parameter.
The effective hash length is 192 bits.
s us-asciis salt must be a strings UTF-8s word must be a string or unicodes $p5k2$s $i i R i i s %xs Invalid salti s@ abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789./s Illegal character %r in salts $p5k2$$s $p5k2$%x$%si s ./N( t Nonet _makesaltR@ RA RB RC RD t
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c C sO d i g } t d ƒ D] } | t d t d d ƒ ƒ q ~ ƒ } t | d ƒ S( s€ Return a 48-bit pseudorandom salt for crypt().
This function is not suitable for generating cryptographic secrets.
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