54 lines
2.3 KiB
Plaintext
54 lines
2.3 KiB
Plaintext
import digest from '../runtime/digest.js';
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import { encode as base64url } from '../runtime/base64url.js';
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import { JOSENotSupported, JWKInvalid } from '../util/errors.js';
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import { encoder } from '../lib/buffer_utils.js';
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import isObject from '../lib/is_object.js';
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const check = (value, description) => {
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if (typeof value !== 'string' || !value) {
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throw new JWKInvalid(`${description} missing or invalid`);
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}
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};
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export async function calculateJwkThumbprint(jwk, digestAlgorithm) {
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if (!isObject(jwk)) {
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throw new TypeError('JWK must be an object');
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}
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digestAlgorithm ?? (digestAlgorithm = 'sha256');
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if (digestAlgorithm !== 'sha256' &&
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digestAlgorithm !== 'sha384' &&
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digestAlgorithm !== 'sha512') {
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throw new TypeError('digestAlgorithm must one of "sha256", "sha384", or "sha512"');
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}
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let components;
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switch (jwk.kty) {
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case 'EC':
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check(jwk.crv, '"crv" (Curve) Parameter');
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check(jwk.x, '"x" (X Coordinate) Parameter');
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check(jwk.y, '"y" (Y Coordinate) Parameter');
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components = { crv: jwk.crv, kty: jwk.kty, x: jwk.x, y: jwk.y };
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break;
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case 'OKP':
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check(jwk.crv, '"crv" (Subtype of Key Pair) Parameter');
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check(jwk.x, '"x" (Public Key) Parameter');
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components = { crv: jwk.crv, kty: jwk.kty, x: jwk.x };
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break;
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case 'RSA':
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check(jwk.e, '"e" (Exponent) Parameter');
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check(jwk.n, '"n" (Modulus) Parameter');
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components = { e: jwk.e, kty: jwk.kty, n: jwk.n };
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break;
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case 'oct':
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check(jwk.k, '"k" (Key Value) Parameter');
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components = { k: jwk.k, kty: jwk.kty };
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break;
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default:
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throw new JOSENotSupported('"kty" (Key Type) Parameter missing or unsupported');
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}
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const data = encoder.encode(JSON.stringify(components));
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return base64url(await digest(digestAlgorithm, data));
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}
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export async function calculateJwkThumbprintUri(jwk, digestAlgorithm) {
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digestAlgorithm ?? (digestAlgorithm = 'sha256');
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const thumbprint = await calculateJwkThumbprint(jwk, digestAlgorithm);
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return `urn:ietf:params:oauth:jwk-thumbprint:sha-${digestAlgorithm.slice(-3)}:${thumbprint}`;
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}
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