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Port of the OpenBSD `bcrypt_pbkdf` function to pure Javascript. `npm`-ified
version of [Devi Mandiri's port]
(https://github.com/devi/tmp/blob/master/js/bcrypt_pbkdf.js),
with some minor performance improvements. The code is copied verbatim (and
un-styled) from Devi's work.
This product includes software developed by Niels Provos.
## API
### `bcrypt_pbkdf.pbkdf(pass, passlen, salt, saltlen, key, keylen, rounds)`
Derive a cryptographic key of arbitrary length from a given password and salt,
using the OpenBSD `bcrypt_pbkdf` function. This is a combination of Blowfish and
SHA-512.
See [this article](http://www.tedunangst.com/flak/post/bcrypt-pbkdf) for
further information.
Parameters:
* `pass`, a Uint8Array of length `passlen`
* `passlen`, an integer Number
* `salt`, a Uint8Array of length `saltlen`
* `saltlen`, an integer Number
* `key`, a Uint8Array of length `keylen`, will be filled with output
* `keylen`, an integer Number
* `rounds`, an integer Number, number of rounds of the PBKDF to run
### `bcrypt_pbkdf.hash(sha2pass, sha2salt, out)`
Calculate a Blowfish hash, given SHA2-512 output of a password and salt. Used as
part of the inner round function in the PBKDF.
Parameters:
* `sha2pass`, a Uint8Array of length 64
* `sha2salt`, a Uint8Array of length 64
* `out`, a Uint8Array of length 32, will be filled with output
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