class Authlogic::CryptoProviders::SCrypt
SCrypt is the default provider for Authlogic. It is the only choice in the adaptive hash family that accounts for hardware based attacks by compensating with memory bound as well as cpu bound computational constraints. It offers the same guarantees as BCrypt in the way of one-way, unique and slow.
Decided SCrypt is for you? Just install the scrypt gem:
gem install scrypt
Tell acts_as_authentic to use it:
acts_as_authentic do |c| c.crypto_provider = Authlogic::CryptoProviders::SCrypt end
Constants
- DEFAULTS
Attributes
Public Instance Methods
Creates an SCrypt hash for the password passed.
# File lib/authlogic/crypto_providers/scrypt.rb, line 51 def encrypt(*tokens) ::SCrypt::Password.create(join_tokens(tokens), :key_len => key_len, :salt_size => salt_size, :max_mem => max_mem, :max_memfrac => max_memfrac, :max_time => max_time) end
Key length - length in bytes of generated key, from 16 to 512.
# File lib/authlogic/crypto_providers/scrypt.rb, line 26 def key_len @key_len ||= DEFAULTS[:key_len] end
Does the hash match the tokens? Uses the same tokens that were used to encrypt.
# File lib/authlogic/crypto_providers/scrypt.rb, line 56 def matches?(hash, *tokens) hash = new_from_hash(hash) return false if hash.blank? hash == join_tokens(tokens) end
Max memory - maximum memory usage. The minimum is always 1MB
# File lib/authlogic/crypto_providers/scrypt.rb, line 41 def max_mem @max_mem ||= DEFAULTS[:max_mem] end
Max memory fraction - maximum memory out of all available. Always greater than zero and <= 0.5.
# File lib/authlogic/crypto_providers/scrypt.rb, line 46 def max_memfrac @max_memfrac ||= DEFAULTS[:max_memfrac] end
Max time - maximum time spent in computation
# File lib/authlogic/crypto_providers/scrypt.rb, line 36 def max_time @max_time ||= DEFAULTS[:max_time] end
Salt size - size in bytes of random salt, from 8 to 32
# File lib/authlogic/crypto_providers/scrypt.rb, line 31 def salt_size @salt_size ||= DEFAULTS[:salt_size] end
Private Instance Methods
# File lib/authlogic/crypto_providers/scrypt.rb, line 63 def join_tokens(tokens) tokens.flatten.join end
# File lib/authlogic/crypto_providers/scrypt.rb, line 67 def new_from_hash(hash) begin ::SCrypt::Password.new(hash) rescue ::SCrypt::Errors::InvalidHash return nil end end