/
rsa.rb
45 lines (36 loc) · 1.2 KB
/
rsa.rb
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# frozen_string_literal: true
module JWT
module JWK
class RSA
extend Forwardable
attr_reader :keypair
def_delegators :keypair, :private?, :public_key
BINARY = 2
KTY = 'RSA'.freeze
def initialize(keypair)
raise ArgumentError, 'keypair must be of type OpenSSL::PKey::RSA' unless keypair.is_a?(OpenSSL::PKey::RSA)
@keypair = keypair
end
def kid
sequence = OpenSSL::ASN1::Sequence([OpenSSL::ASN1::Integer.new(public_key.n),
OpenSSL::ASN1::Integer.new(public_key.e)])
OpenSSL::Digest::SHA256.hexdigest(sequence.to_der)
end
def export
{
kty: KTY,
n: Base64.urlsafe_encode64(public_key.n.to_s(BINARY), padding: false),
e: Base64.urlsafe_encode64(public_key.e.to_s(BINARY), padding: false),
kid: kid
}
end
def self.import(jwk_data)
imported_key = OpenSSL::PKey::RSA.new
imported_key.set_key(OpenSSL::BN.new(Base64.urlsafe_decode64(jwk_data[:n]), BINARY),
OpenSSL::BN.new(Base64.urlsafe_decode64(jwk_data[:e]), BINARY),
nil)
self.new(imported_key)
end
end
end
end