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module JSON
class JWK
module JWKizable
module RSA
def to_jwk(ex_params = {})
params = {
kty: :RSA,
e: UrlSafeBase64.encode64(e.to_s(2)),
n: UrlSafeBase64.encode64(n.to_s(2))
}.merge ex_params
if private?
params.merge!(
d: UrlSafeBase64.encode64(d.to_s(2)),
p: UrlSafeBase64.encode64(p.to_s(2)),
q: UrlSafeBase64.encode64(q.to_s(2))
)
end
JWK.new params
end
end
module EC
def to_jwk(ex_params = {})
params = {
kty: :EC,
crv: curve_name,
x: UrlSafeBase64.encode64(coordinates[:x].to_s(2)),
y: UrlSafeBase64.encode64(coordinates[:y].to_s(2))
}.merge ex_params
params[:d] = UrlSafeBase64.encode64(coordinates[:d].to_s(2)) if private_key?
JWK.new params
end
private
def curve_name
case group.curve_name
when 'prime256v1'
:'P-256'
when 'secp384r1'
:'P-384'
when 'secp521r1'
:'P-521'
else
raise UnknownAlgorithm.new('Unknown EC Curve')
end
end
def coordinates
unless @coordinates
hex = public_key.to_bn.to_s(16)
data_len = hex.length - 2
hex_x = hex[2, data_len / 2]
hex_y = hex[2 + data_len / 2, data_len / 2]
@coordinates = {
x: OpenSSL::BN.new([hex_x].pack('H*'), 2),
y: OpenSSL::BN.new([hex_y].pack('H*'), 2)
}
@coordinates[:d] = private_key if private_key?
end
@coordinates
end
end
end
end
end
OpenSSL::PKey::RSA.send :include, JSON::JWK::JWKizable::RSA
OpenSSL::PKey::EC.send :include, JSON::JWK::JWKizable::EC
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