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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
+
+## License
+
+This source form is a 1:1 port from the OpenBSD `blowfish.c` and `bcrypt_pbkdf.c`.
+As a result, it retains the original copyright and license. The two files are
+under slightly different (but compatible) licenses, and are here combined in
+one file. For each of the full license texts see `LICENSE`.