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# frozen_string_literal: true
require "cbor"
require "cose/security_message"
require "openssl"
module COSE
class Mac0 < SecurityMessage
CONTEXT = "MAC0"
attr_reader :payload, :tag
def self.keyword_arguments_for_initialize(decoded)
{ payload: decoded[0], tag: decoded[1] }
end
def self.tag
17
end
def initialize(payload:, tag:, **keyword_arguments)
super(**keyword_arguments)
@payload = payload
@tag = tag
end
def verify(key, external_aad = nil)
tag == algorithm.mac(key.k, data(external_aad)) || raise(COSE::Error, "Mac0 verification failed")
end
private
def data(external_aad = nil)
CBOR.encode([context, serialized_map(protected_headers), external_aad || zero_length_bin_string, payload])
end
def context
CONTEXT
end
end
end
|
