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require "digest/sha2"
module Authlogic
# The acts_as_authentic method has a crypto_provider option. This allows you
# to use any type of encryption you like. Just create a class with a class
# level encrypt and matches? method. See example below.
#
# === Example
#
# class MyAwesomeEncryptionMethod
# def self.encrypt(*tokens)
# # the tokens passed will be an array of objects, what type of object
# # is irrelevant, just do what you need to do with them and return a
# # single encrypted string. for example, you will most likely join all
# # of the objects into a single string and then encrypt that string
# end
#
# def self.matches?(crypted, *tokens)
# # return true if the crypted string matches the tokens. Depending on
# # your algorithm you might decrypt the string then compare it to the
# # token, or you might encrypt the tokens and make sure it matches the
# # crypted string, its up to you.
# end
# end
module CryptoProviders
# = Sha256
#
# Uses the Sha256 hash algorithm to encrypt passwords.
class Sha256
class << self
attr_accessor :join_token
# The number of times to loop through the encryption.
def stretches
@stretches ||= 20
end
attr_writer :stretches
# Turns your raw password into a Sha256 hash.
def encrypt(*tokens)
digest = tokens.flatten.join(join_token)
stretches.times { digest = Digest::SHA256.hexdigest(digest) }
digest
end
# Does the crypted password match the tokens? Uses the same tokens that
# were used to encrypt.
def matches?(crypted, *tokens)
encrypt(*tokens) == crypted
end
end
end
end
end
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