This module implements the Scrypt key derivation function as specified in .
 - C. Percival. Stronger Key Derivation Via Sequential Memory-Hard Functions. http://www.tarsnap.com/scrypt/scrypt.pdf
The Scrypt parameter values.
The scrypt key derivation function.
scrypt_check compares a password against the result of a previous call to scrypt_simple and returns true if the passed in password hashes to the same value.
scrypt_simple is a helper function that should be sufficient for the majority of cases where an application needs to use Scrypt to hash a password for storage. The result is a String that contains the parameters used as part of its encoding. The scrypt_check function may be used on a password to check if it is equal to a hashed value.