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# frozen_string_literal: true
require "openssl"
module AndroidKeyAttestation
module FixedLengthSecureCompare
unless OpenSSL.singleton_class.method_defined?(:fixed_length_secure_compare)
refine OpenSSL.singleton_class do
def fixed_length_secure_compare(a, b) # rubocop:disable Naming/UncommunicativeMethodParamName
raise ArgumentError, "inputs must be of equal length" unless a.bytesize == b.bytesize
# borrowed from Rack::Utils
l = a.unpack("C*")
r, i = 0, -1
b.each_byte { |v| r |= v ^ l[i += 1] }
r == 0
end
end
end
end
end
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