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Contents
# frozen_string_literal: true
require "cose/algorithm"
require "cose/key/ec2"
require "webauthn/attestation_statement/base"
module WebAuthn
module AttestationStatement
class FidoU2f < Base
class PublicKey
COORDINATE_LENGTH = 32
UNCOMPRESSED_FORM_INDICATOR = "\x04"
def self.uncompressed_point?(data)
data.size &&
data.length == UNCOMPRESSED_FORM_INDICATOR.length + COORDINATE_LENGTH * 2 &&
data[0] == UNCOMPRESSED_FORM_INDICATOR
end
def initialize(data)
@data = data
end
def valid?
data.size >= COORDINATE_LENGTH * 2 &&
cose_key.x.length == COORDINATE_LENGTH &&
cose_key.y.length == COORDINATE_LENGTH &&
cose_key.alg == COSE::Algorithm.by_name("ES256").id
end
def to_uncompressed_point
UNCOMPRESSED_FORM_INDICATOR + cose_key.x + cose_key.y
end
private
attr_reader :data
def cose_key
@cose_key ||= COSE::Key::EC2.deserialize(data)
end
end
end
end
end
Version data entries
25 entries across 25 versions & 1 rubygems