88 lines
3.4 KiB
Plaintext
88 lines
3.4 KiB
Plaintext
import { wrap as aesKw } from '../runtime/aeskw.js';
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import * as ECDH from '../runtime/ecdhes.js';
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import { encrypt as pbes2Kw } from '../runtime/pbes2kw.js';
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import { encrypt as rsaEs } from '../runtime/rsaes.js';
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import { encode as base64url } from '../runtime/base64url.js';
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import generateCek, { bitLength as cekLength } from '../lib/cek.js';
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import { JOSENotSupported } from '../util/errors.js';
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import { exportJWK } from '../key/export.js';
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import checkKeyType from './check_key_type.js';
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import { wrap as aesGcmKw } from './aesgcmkw.js';
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async function encryptKeyManagement(alg, enc, key, providedCek, providedParameters = {}) {
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let encryptedKey;
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let parameters;
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let cek;
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checkKeyType(alg, key, 'encrypt');
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switch (alg) {
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case 'dir': {
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cek = key;
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break;
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}
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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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if (!ECDH.ecdhAllowed(key)) {
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throw new JOSENotSupported('ECDH with the provided key is not allowed or not supported by your javascript runtime');
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}
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const { apu, apv } = providedParameters;
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let { epk: ephemeralKey } = providedParameters;
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ephemeralKey ||= (await ECDH.generateEpk(key)).privateKey;
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const { x, y, crv, kty } = await exportJWK(ephemeralKey);
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const sharedSecret = await ECDH.deriveKey(key, ephemeralKey, alg === 'ECDH-ES' ? enc : alg, alg === 'ECDH-ES' ? cekLength(enc) : parseInt(alg.slice(-5, -2), 10), apu, apv);
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parameters = { epk: { x, crv, kty } };
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if (kty === 'EC')
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parameters.epk.y = y;
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if (apu)
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parameters.apu = base64url(apu);
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if (apv)
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parameters.apv = base64url(apv);
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if (alg === 'ECDH-ES') {
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cek = sharedSecret;
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break;
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}
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cek = providedCek || generateCek(enc);
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const kwAlg = alg.slice(-6);
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encryptedKey = await aesKw(kwAlg, sharedSecret, cek);
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break;
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}
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case 'RSA1_5':
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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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cek = providedCek || generateCek(enc);
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encryptedKey = await rsaEs(alg, key, cek);
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break;
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}
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case 'PBES2-HS256+A128KW':
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case 'PBES2-HS384+A192KW':
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case 'PBES2-HS512+A256KW': {
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cek = providedCek || generateCek(enc);
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const { p2c, p2s } = providedParameters;
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({ encryptedKey, ...parameters } = await pbes2Kw(alg, key, cek, p2c, p2s));
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break;
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}
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case 'A128KW':
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case 'A192KW':
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case 'A256KW': {
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cek = providedCek || generateCek(enc);
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encryptedKey = await aesKw(alg, key, cek);
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break;
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}
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case 'A128GCMKW':
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case 'A192GCMKW':
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case 'A256GCMKW': {
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cek = providedCek || generateCek(enc);
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const { iv } = providedParameters;
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({ encryptedKey, ...parameters } = await aesGcmKw(alg, key, cek, iv));
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break;
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}
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default: {
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throw new JOSENotSupported('Invalid or unsupported "alg" (JWE Algorithm) header value');
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}
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}
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return { cek, encryptedKey, parameters };
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}
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export default encryptKeyManagement;
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