This package provides bindings to Colin Percival's scrypt
implementation (http://www.tarsnap.com/scrypt.html). Scrypt is a key
derivation function designed to be far more secure against hardware
brute-force attacks than alternative functions such as PBKDF2 or bcrypt.
Details of the scrypt key derivation function are given in a paper by
Colin Percival, Stronger Key Derivation via Sequential Memory-Hard
Functions: http://www.tarsnap.com/scrypt/scrypt.pdf.