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Versions: 9
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Contents
module Rmega
module Nodes
# The key associated to a node. It can be 128 or 256 bits long,
# when is 256 bits long is composed by:
# * A 128 bit AES-128 key
# * The upper 64 bit of the counter start value (the lower 64 bit
# are starting at 0 and incrementing by 1 for each AES block of 16
# bytes)
# * A 64 bit meta-MAC of all chunk MACs
class NodeKey
attr_reader :aes_key, :ctr_nonce, :meta_mac
attr_accessor :meta_mac
def initialize(string)
@aes_key = string[0..15]
@ctr_nonce = string[16..23]
@meta_mac = string[24..31]
end
def generate
self.class.compact("#{@aes_key}#{@ctr_nonce}#{@meta_mac}") + @ctr_nonce + @meta_mac
end
# note: folder key is 16 bytes long while file key is 32
def self.load(string)
new("#{compact(string)}#{string[16..-1]}")
end
def self.compact(string)
if string.size > 16
bytes = string.bytes.to_a
return 16.times.inject([]) { |ary, i| ary[i] = bytes[i] ^ bytes[i+16]; ary }.map(&:chr).join
else
return string
end
end
def self.random
new(OpenSSL::Random.random_bytes(16 + 8 + 0))
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems