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 Class Methods
Creates an SCrypt hash for the password passed.
# File lib/authlogic/crypto_providers/scrypt.rb, line 58 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 32 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 70 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 47 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 53 def max_memfrac @max_memfrac ||= DEFAULTS[:max_memfrac] end
Max time - maximum time spent in computation
# File lib/authlogic/crypto_providers/scrypt.rb, line 42 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 37 def salt_size @salt_size ||= DEFAULTS[:salt_size] end
Private Class Methods
# File lib/authlogic/crypto_providers/scrypt.rb, line 78 def join_tokens(tokens) tokens.flatten.join end
# File lib/authlogic/crypto_providers/scrypt.rb, line 82 def new_from_hash(hash) ::SCrypt::Password.new(hash) rescue ::SCrypt::Errors::InvalidHash nil end