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# frozen_string_literal: true
require "cbor"
require "cose/key/ec2"
require "cose/key/okp"
require "cose/key/rsa"
require "cose/key/symmetric"
require "openssl"
module COSE
class Error < StandardError; end
class KeyDeserializationError < Error; end
class MalformedKeyError < KeyDeserializationError; end
class UnknownKeyType < KeyDeserializationError; end
module Key
def self.serialize(pkey)
from_pkey(pkey).serialize
end
def self.from_pkey(pkey)
case pkey
when OpenSSL::PKey::EC, OpenSSL::PKey::EC::Point
COSE::Key::EC2.from_pkey(pkey)
when OpenSSL::PKey::RSA
COSE::Key::RSA.from_pkey(pkey)
when OpenSSL::PKey::PKey
COSE::Key::OKP.from_pkey(pkey)
else
raise "Unsupported #{pkey.class} object"
end
end
def self.deserialize(data)
map = cbor_decode(data)
case map[Base::LABEL_KTY]
when COSE::Key::OKP::KTY_OKP
COSE::Key::OKP.from_map(map)
when COSE::Key::EC2::KTY_EC2
COSE::Key::EC2.from_map(map)
when COSE::Key::RSA::KTY_RSA
COSE::Key::RSA.from_map(map)
when COSE::Key::Symmetric::KTY_SYMMETRIC
COSE::Key::Symmetric.from_map(map)
when nil
raise COSE::UnknownKeyType, "Missing required key type kty label"
else
raise COSE::UnknownKeyType, "Unsupported or unknown key type #{map[Base::LABEL_KTY]}"
end
end
def self.cbor_decode(data)
CBOR.decode(data)
rescue CBOR::MalformedFormatError, EOFError, FloatDomainError, RegexpError, TypeError, URI::InvalidURIError
raise COSE::MalformedKeyError, "Malformed CBOR key input"
end
end
end
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