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# frozen_string_literal: true
require_relative "authorization_list"
module AndroidKeyAttestation
class KeyDescription
# https://developer.android.com/training/articles/security-key-attestation#certificate_schema
ATTESTATION_VERSION_INDEX = 0
ATTESTATION_SECURITY_LEVEL_INDEX = 1
KEYMASTER_VERSION_INDEX = 2
KEYMASTER_SECURITY_LEVEL_INDEX = 3
ATTESTATION_CHALLENGE_INDEX = 4
UNIQUE_ID_INDEX = 5
SOFTWARE_ENFORCED_INDEX = 6
TEE_ENFORCED_INDEX = 7
SECURITY_LEVEL_ENUM = {
0 => :software,
1 => :trusted_environment,
2 => :strong_box
}.freeze
def initialize(sequence)
@sequence = sequence
end
def attestation_version
Integer(sequence[ATTESTATION_VERSION_INDEX].value)
end
def attestation_security_level
SECURITY_LEVEL_ENUM.fetch(Integer(sequence[ATTESTATION_SECURITY_LEVEL_INDEX].value))
end
def keymaster_version
Integer(sequence[KEYMASTER_VERSION_INDEX].value)
end
def keymaster_security_level
SECURITY_LEVEL_ENUM.fetch(Integer(sequence[KEYMASTER_SECURITY_LEVEL_INDEX].value))
end
def attestation_challenge
sequence[ATTESTATION_CHALLENGE_INDEX].value
end
def unique_id
sequence[UNIQUE_ID_INDEX].value
end
def tee_enforced
@tee_enforced ||= AuthorizationList.new(sequence[TEE_ENFORCED_INDEX].value)
end
def software_enforced
@software_enforced ||= AuthorizationList.new(sequence[SOFTWARE_ENFORCED_INDEX].value)
end
private
attr_reader :sequence
end
end
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