N is iterations and M is key length.
You can use the CRYPT validator to check them automatically

>>> alg = 'pbkdf2(1000,20,sha512)' 

>>> a = str(CRYPT(digest_alg=alg,salt=True)('test')[0])
>>> a == 'pbkdf2(1000,20,sha512)$...$...'





On Saturday, 6 February 2016 23:32:01 UTC-6, Camilo wrote:
>
> Hi,
>
> So am trying to validate passwords against a db generated by web2py.
>
> The format is "pbkdf2(N,M,sha512)$X$Y". I suppose N is iterations 
> (although it seems kind of low), X is salt and Y is encrypted. What would M 
> be?
>
> Thank you
>

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