covid-certificate/lib/cose/header/headers.js

Parse and verify a european digital covid certificate (dcc)

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.extractAlgorithm = exports.extractKid = void 0;
const extractHeader_1 = require("./extractHeader");
const header_1 = require("../header");
/**
 * Extract kid
 *
 * @param protectedHeaders
 * @param unprotectedHeaders
 */
const extractKid = (protectedHeaders, unprotectedHeaders) => {
    const kid = (0, extractHeader_1.extractHeader)(protectedHeaders, unprotectedHeaders, header_1.Header.kid);
    if (!Buffer.isBuffer(kid)) {
        throw new Error("kid header is not a buffer");
    }
    return kid.toString("base64");
};
exports.extractKid = extractKid;
/**
 * Extract algorithm
 *
 * @param protectedHeaders
 * @param unprotectedHeaders
 */
const extractAlgorithm = (protectedHeaders, unprotectedHeaders) => {
    const alg = (0, extractHeader_1.extractHeader)(protectedHeaders, unprotectedHeaders, header_1.Header.algorithm);
    if (typeof alg !== "number") {
        throw new Error("Algorithm header is not a number");
    }
    return alg;
};
exports.extractAlgorithm = extractAlgorithm;