Marc Mintel
5397309103
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101 lines
3.8 KiB
Plaintext
101 lines
3.8 KiB
Plaintext
import crypto from './webcrypto.js';
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import { JOSENotSupported } from '../util/errors.js';
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function subtleMapping(jwk) {
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let algorithm;
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let keyUsages;
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switch (jwk.kty) {
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case 'RSA': {
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switch (jwk.alg) {
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case 'PS256':
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case 'PS384':
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case 'PS512':
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algorithm = { name: 'RSA-PSS', hash: `SHA-${jwk.alg.slice(-3)}` };
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keyUsages = jwk.d ? ['sign'] : ['verify'];
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break;
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case 'RS256':
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case 'RS384':
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case 'RS512':
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algorithm = { name: 'RSASSA-PKCS1-v1_5', hash: `SHA-${jwk.alg.slice(-3)}` };
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keyUsages = jwk.d ? ['sign'] : ['verify'];
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break;
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case 'RSA-OAEP':
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case 'RSA-OAEP-256':
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case 'RSA-OAEP-384':
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case 'RSA-OAEP-512':
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algorithm = {
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name: 'RSA-OAEP',
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hash: `SHA-${parseInt(jwk.alg.slice(-3), 10) || 1}`,
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};
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keyUsages = jwk.d ? ['decrypt', 'unwrapKey'] : ['encrypt', 'wrapKey'];
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break;
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default:
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throw new JOSENotSupported('Invalid or unsupported JWK "alg" (Algorithm) Parameter value');
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}
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break;
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}
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case 'EC': {
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switch (jwk.alg) {
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case 'ES256':
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algorithm = { name: 'ECDSA', namedCurve: 'P-256' };
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keyUsages = jwk.d ? ['sign'] : ['verify'];
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break;
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case 'ES384':
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algorithm = { name: 'ECDSA', namedCurve: 'P-384' };
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keyUsages = jwk.d ? ['sign'] : ['verify'];
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break;
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case 'ES512':
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algorithm = { name: 'ECDSA', namedCurve: 'P-521' };
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keyUsages = jwk.d ? ['sign'] : ['verify'];
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break;
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case 'ECDH-ES':
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case 'ECDH-ES+A128KW':
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case 'ECDH-ES+A192KW':
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case 'ECDH-ES+A256KW':
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algorithm = { name: 'ECDH', namedCurve: jwk.crv };
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keyUsages = jwk.d ? ['deriveBits'] : [];
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break;
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default:
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throw new JOSENotSupported('Invalid or unsupported JWK "alg" (Algorithm) Parameter value');
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}
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break;
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}
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case 'OKP': {
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switch (jwk.alg) {
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case 'EdDSA':
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algorithm = { name: jwk.crv };
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keyUsages = jwk.d ? ['sign'] : ['verify'];
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break;
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case 'ECDH-ES':
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case 'ECDH-ES+A128KW':
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case 'ECDH-ES+A192KW':
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case 'ECDH-ES+A256KW':
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algorithm = { name: jwk.crv };
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keyUsages = jwk.d ? ['deriveBits'] : [];
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break;
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default:
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throw new JOSENotSupported('Invalid or unsupported JWK "alg" (Algorithm) Parameter value');
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}
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break;
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}
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default:
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throw new JOSENotSupported('Invalid or unsupported JWK "kty" (Key Type) Parameter value');
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}
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return { algorithm, keyUsages };
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}
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const parse = async (jwk) => {
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if (!jwk.alg) {
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throw new TypeError('"alg" argument is required when "jwk.alg" is not present');
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}
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const { algorithm, keyUsages } = subtleMapping(jwk);
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const rest = [
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algorithm,
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jwk.ext ?? false,
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jwk.key_ops ?? keyUsages,
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];
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const keyData = { ...jwk };
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delete keyData.alg;
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delete keyData.use;
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return crypto.subtle.importKey('jwk', keyData, ...rest);
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};
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export default parse;
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