Class | Authlogic::CryptoProviders::BCrypt |
In: |
lib/casserver/authenticators/authlogic_crypto_providers/bcrypt.rb
|
Parent: | Object |
For most apps Sha512 is plenty secure, but if you are building an app that stores nuclear launch codes you might want to consier BCrypt. This is an extremely secure hashing algorithm, mainly because it is slow. A brute force attack on a BCrypt encrypted password would take much longer than a brute force attack on a password encrypted with a Sha algorithm. Keep in mind you are sacrificing performance by using this, generating a password takes exponentially longer than any of the Sha algorithms. I did some benchmarking to save you some time with your decision:
require "bcrypt" require "digest" require "benchmark" Benchmark.bm(18) do |x| x.report("BCrypt (cost = 10:") { 100.times { BCrypt::Password.create("mypass", :cost => 10) } } x.report("BCrypt (cost = 2:") { 100.times { BCrypt::Password.create("mypass", :cost => 2) } } x.report("Sha512:") { 100.times { Digest::SHA512.hexdigest("mypass") } } x.report("Sha1:") { 100.times { Digest::SHA1.hexdigest("mypass") } } end user system total real BCrypt (cost = 10): 10.780000 0.060000 10.840000 ( 11.100289) BCrypt (cost = 2): 0.180000 0.000000 0.180000 ( 0.181914) Sha512: 0.000000 0.000000 0.000000 ( 0.000829) Sha1: 0.000000 0.000000 0.000000 ( 0.000395)
You can play around with the cost to get that perfect balance between performance and security.
Decided BCrypt is for you? Just insall the bcrypt gem:
gem install bcrypt-ruby
Tell acts_as_authentic to use it:
acts_as_authentic do |c| c.crypto_provider = Authlogic::CryptoProviders::BCrypt end
You are good to go!
cost | [W] |
This is the :cost option for the BCrpyt library. The higher the cost the more secure it is and the longer is take the generate a hash. By default this is 10. Set this to whatever you want, play around with it to get that perfect balance between security and performance.
# File lib/casserver/authenticators/authlogic_crypto_providers/bcrypt.rb, line 47 47: def cost 48: @cost ||= 10 49: end
This method is used as a flag to tell Authlogic to "resave" the password upon a successful login, using the new cost
# File lib/casserver/authenticators/authlogic_crypto_providers/bcrypt.rb, line 68 68: def cost_matches?(hash) 69: hash = new_from_hash(hash) 70: if hash.blank? 71: false 72: else 73: hash.cost == cost 74: end 75: end
Does the hash match the tokens? Uses the same tokens that were used to encrypt.
# File lib/casserver/authenticators/authlogic_crypto_providers/bcrypt.rb, line 58 58: def matches?(hash, *tokens) 59: $LOG.debug hash 60: $LOG.debug tokens.inspect 61: 62: hash = new_from_hash(hash) 63: return false if hash.blank? 64: hash == join_tokens(tokens) 65: end