59 lines
1.8 KiB
TypeScript
59 lines
1.8 KiB
TypeScript
// Basically Macaroons [1] in a Dataspace context
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//
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// [1]: Birgisson, Arnar, Joe Gibbs Politz, Úlfar Erlingsson, Ankur
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// Taly, Michael Vrable, and Mark Lentczner. “Macaroons: Cookies with
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// Contextual Caveats for Decentralized Authorization in the Cloud.”
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// In Network and Distributed System Security Symposium. San Diego,
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// California: Internet Society, 2014.
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import { mac } from './cryptography.js';
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import { Bytes, decode, encode, is } from '@preserves/core';
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import * as S from '../gen/sturdy.js';
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export * from '../gen/sturdy.js';
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export type SturdyValue = S._val;
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export const KEY_LENGTH = 16; // 128 bits
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export function pointerNotAllowed(): never {
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throw new Error("Embedded Ref not permitted in SturdyRef");
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}
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export function sturdyEncode(v: SturdyValue): Bytes {
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return encode<S._ptr>(v, {
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canonical: true,
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includeAnnotations: false,
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encodePointer: pointerNotAllowed,
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});
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}
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export function sturdyDecode(bs: Bytes): SturdyValue {
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return decode<S._ptr>(bs, {
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includeAnnotations: false,
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decodePointer: pointerNotAllowed,
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});
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}
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export async function mint(oid: SturdyValue, secretKey: Bytes): Promise<S.SturdyRef> {
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return S.SturdyRef({
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oid,
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caveatChain: [],
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sig: await mac(secretKey, sturdyEncode(oid)),
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});
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}
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export async function attenuate(r: S.SturdyRef, ... a: S.Attenuation): Promise<S.SturdyRef> {
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return S.SturdyRef({
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oid: r.oid,
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caveatChain: [... r.caveatChain, a],
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sig: await mac(r.sig, sturdyEncode(S.fromAttenuation(a)))
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});
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}
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export async function validate(r: S.SturdyRef, secretKey: Bytes): Promise<boolean> {
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const sig = await r.caveatChain.reduce(
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async (sig, a) => mac(await sig, sturdyEncode(S.fromAttenuation(a))),
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mac(secretKey, sturdyEncode(r.oid)));
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return is(sig, r.sig);
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}
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