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# frozen_string_literal: true
require "cbor"
require "cose/algorithm"
require "cose/error"
require "cose/security_message/headers"
module COSE
class SecurityMessage
ZERO_LENGTH_BIN_STRING = "".b
attr_reader :protected_headers, :unprotected_headers
def self.deserialize(cbor)
decoded = CBOR.decode(cbor)
if decoded.is_a?(CBOR::Tagged)
if respond_to?(:tag) && tag != decoded.tag
raise(COSE::Error, "Invalid CBOR tag")
end
decoded = decoded.value
end
from_array(decoded)
end
def self.from_array(array)
new(
protected_headers: deserialize_headers(array[0]),
unprotected_headers: array[1],
**keyword_arguments_for_initialize(array[2..-1])
)
end
def self.deserialize_headers(data)
if data == ZERO_LENGTH_BIN_STRING
{}
else
CBOR.decode(data)
end
end
def initialize(protected_headers:, unprotected_headers:)
@protected_headers = protected_headers
@unprotected_headers = unprotected_headers
end
def algorithm
@algorithm ||= COSE::Algorithm.find(headers.alg) || raise(COSE::Error, "Unsupported algorithm '#{headers.alg}'")
end
def headers
@headers ||= Headers.new(protected_headers, unprotected_headers)
end
private
def serialized_map(map)
if map && !map.empty?
map.to_cbor
else
zero_length_bin_string
end
end
def zero_length_bin_string
ZERO_LENGTH_BIN_STRING
end
end
end
|
