Erster Commit
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+161
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import { decode as base64url } from '../../runtime/base64url.js';
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import decrypt from '../../runtime/decrypt.js';
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import { JOSEAlgNotAllowed, JOSENotSupported, JWEInvalid } from '../../util/errors.js';
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import isDisjoint from '../../lib/is_disjoint.js';
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import isObject from '../../lib/is_object.js';
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import decryptKeyManagement from '../../lib/decrypt_key_management.js';
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import { encoder, decoder, concat } from '../../lib/buffer_utils.js';
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import generateCek from '../../lib/cek.js';
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import validateCrit from '../../lib/validate_crit.js';
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import validateAlgorithms from '../../lib/validate_algorithms.js';
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export async function flattenedDecrypt(jwe, key, options) {
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if (!isObject(jwe)) {
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throw new JWEInvalid('Flattened JWE must be an object');
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}
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if (jwe.protected === undefined && jwe.header === undefined && jwe.unprotected === undefined) {
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throw new JWEInvalid('JOSE Header missing');
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}
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if (jwe.iv !== undefined && typeof jwe.iv !== 'string') {
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throw new JWEInvalid('JWE Initialization Vector incorrect type');
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}
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if (typeof jwe.ciphertext !== 'string') {
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throw new JWEInvalid('JWE Ciphertext missing or incorrect type');
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}
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if (jwe.tag !== undefined && typeof jwe.tag !== 'string') {
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throw new JWEInvalid('JWE Authentication Tag incorrect type');
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}
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if (jwe.protected !== undefined && typeof jwe.protected !== 'string') {
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throw new JWEInvalid('JWE Protected Header incorrect type');
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}
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if (jwe.encrypted_key !== undefined && typeof jwe.encrypted_key !== 'string') {
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throw new JWEInvalid('JWE Encrypted Key incorrect type');
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}
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if (jwe.aad !== undefined && typeof jwe.aad !== 'string') {
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throw new JWEInvalid('JWE AAD incorrect type');
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}
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if (jwe.header !== undefined && !isObject(jwe.header)) {
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throw new JWEInvalid('JWE Shared Unprotected Header incorrect type');
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}
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if (jwe.unprotected !== undefined && !isObject(jwe.unprotected)) {
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throw new JWEInvalid('JWE Per-Recipient Unprotected Header incorrect type');
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}
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let parsedProt;
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if (jwe.protected) {
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try {
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const protectedHeader = base64url(jwe.protected);
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parsedProt = JSON.parse(decoder.decode(protectedHeader));
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}
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catch {
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throw new JWEInvalid('JWE Protected Header is invalid');
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}
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}
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if (!isDisjoint(parsedProt, jwe.header, jwe.unprotected)) {
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throw new JWEInvalid('JWE Protected, JWE Unprotected Header, and JWE Per-Recipient Unprotected Header Parameter names must be disjoint');
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}
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const joseHeader = {
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...parsedProt,
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...jwe.header,
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...jwe.unprotected,
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};
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validateCrit(JWEInvalid, new Map(), options?.crit, parsedProt, joseHeader);
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if (joseHeader.zip !== undefined) {
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throw new JOSENotSupported('JWE "zip" (Compression Algorithm) Header Parameter is not supported.');
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}
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const { alg, enc } = joseHeader;
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if (typeof alg !== 'string' || !alg) {
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throw new JWEInvalid('missing JWE Algorithm (alg) in JWE Header');
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}
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if (typeof enc !== 'string' || !enc) {
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throw new JWEInvalid('missing JWE Encryption Algorithm (enc) in JWE Header');
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}
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const keyManagementAlgorithms = options && validateAlgorithms('keyManagementAlgorithms', options.keyManagementAlgorithms);
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const contentEncryptionAlgorithms = options &&
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validateAlgorithms('contentEncryptionAlgorithms', options.contentEncryptionAlgorithms);
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if ((keyManagementAlgorithms && !keyManagementAlgorithms.has(alg)) ||
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(!keyManagementAlgorithms && alg.startsWith('PBES2'))) {
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throw new JOSEAlgNotAllowed('"alg" (Algorithm) Header Parameter value not allowed');
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}
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if (contentEncryptionAlgorithms && !contentEncryptionAlgorithms.has(enc)) {
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throw new JOSEAlgNotAllowed('"enc" (Encryption Algorithm) Header Parameter value not allowed');
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}
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let encryptedKey;
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if (jwe.encrypted_key !== undefined) {
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try {
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encryptedKey = base64url(jwe.encrypted_key);
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}
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catch {
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throw new JWEInvalid('Failed to base64url decode the encrypted_key');
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}
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}
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let resolvedKey = false;
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if (typeof key === 'function') {
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key = await key(parsedProt, jwe);
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resolvedKey = true;
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}
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let cek;
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try {
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cek = await decryptKeyManagement(alg, key, encryptedKey, joseHeader, options);
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}
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catch (err) {
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if (err instanceof TypeError || err instanceof JWEInvalid || err instanceof JOSENotSupported) {
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throw err;
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}
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cek = generateCek(enc);
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}
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let iv;
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let tag;
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if (jwe.iv !== undefined) {
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try {
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iv = base64url(jwe.iv);
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}
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catch {
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throw new JWEInvalid('Failed to base64url decode the iv');
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}
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}
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if (jwe.tag !== undefined) {
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try {
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tag = base64url(jwe.tag);
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}
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catch {
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throw new JWEInvalid('Failed to base64url decode the tag');
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}
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}
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const protectedHeader = encoder.encode(jwe.protected ?? '');
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let additionalData;
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if (jwe.aad !== undefined) {
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additionalData = concat(protectedHeader, encoder.encode('.'), encoder.encode(jwe.aad));
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}
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else {
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additionalData = protectedHeader;
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}
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let ciphertext;
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try {
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ciphertext = base64url(jwe.ciphertext);
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}
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catch {
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throw new JWEInvalid('Failed to base64url decode the ciphertext');
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}
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const plaintext = await decrypt(enc, cek, ciphertext, iv, tag, additionalData);
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const result = { plaintext };
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if (jwe.protected !== undefined) {
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result.protectedHeader = parsedProt;
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}
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if (jwe.aad !== undefined) {
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try {
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result.additionalAuthenticatedData = base64url(jwe.aad);
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}
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catch {
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throw new JWEInvalid('Failed to base64url decode the aad');
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}
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}
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if (jwe.unprotected !== undefined) {
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result.sharedUnprotectedHeader = jwe.unprotected;
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}
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if (jwe.header !== undefined) {
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result.unprotectedHeader = jwe.header;
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}
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if (resolvedKey) {
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return { ...result, key };
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}
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return result;
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}
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+153
@@ -0,0 +1,153 @@
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import { encode as base64url } from '../../runtime/base64url.js';
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import { unprotected } from '../../lib/private_symbols.js';
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import encrypt from '../../runtime/encrypt.js';
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import encryptKeyManagement from '../../lib/encrypt_key_management.js';
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import { JOSENotSupported, JWEInvalid } from '../../util/errors.js';
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import isDisjoint from '../../lib/is_disjoint.js';
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import { encoder, decoder, concat } from '../../lib/buffer_utils.js';
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import validateCrit from '../../lib/validate_crit.js';
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export class FlattenedEncrypt {
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constructor(plaintext) {
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if (!(plaintext instanceof Uint8Array)) {
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throw new TypeError('plaintext must be an instance of Uint8Array');
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}
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this._plaintext = plaintext;
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}
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setKeyManagementParameters(parameters) {
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if (this._keyManagementParameters) {
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throw new TypeError('setKeyManagementParameters can only be called once');
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}
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this._keyManagementParameters = parameters;
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return this;
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}
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setProtectedHeader(protectedHeader) {
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if (this._protectedHeader) {
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throw new TypeError('setProtectedHeader can only be called once');
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}
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this._protectedHeader = protectedHeader;
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return this;
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}
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setSharedUnprotectedHeader(sharedUnprotectedHeader) {
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if (this._sharedUnprotectedHeader) {
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throw new TypeError('setSharedUnprotectedHeader can only be called once');
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}
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this._sharedUnprotectedHeader = sharedUnprotectedHeader;
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return this;
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}
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setUnprotectedHeader(unprotectedHeader) {
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if (this._unprotectedHeader) {
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throw new TypeError('setUnprotectedHeader can only be called once');
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}
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this._unprotectedHeader = unprotectedHeader;
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return this;
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}
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setAdditionalAuthenticatedData(aad) {
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this._aad = aad;
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return this;
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}
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setContentEncryptionKey(cek) {
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if (this._cek) {
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throw new TypeError('setContentEncryptionKey can only be called once');
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}
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this._cek = cek;
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return this;
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}
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setInitializationVector(iv) {
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if (this._iv) {
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throw new TypeError('setInitializationVector can only be called once');
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}
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this._iv = iv;
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return this;
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}
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async encrypt(key, options) {
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if (!this._protectedHeader && !this._unprotectedHeader && !this._sharedUnprotectedHeader) {
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throw new JWEInvalid('either setProtectedHeader, setUnprotectedHeader, or sharedUnprotectedHeader must be called before #encrypt()');
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}
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if (!isDisjoint(this._protectedHeader, this._unprotectedHeader, this._sharedUnprotectedHeader)) {
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throw new JWEInvalid('JWE Protected, JWE Shared Unprotected and JWE Per-Recipient Header Parameter names must be disjoint');
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}
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const joseHeader = {
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...this._protectedHeader,
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...this._unprotectedHeader,
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...this._sharedUnprotectedHeader,
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};
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validateCrit(JWEInvalid, new Map(), options?.crit, this._protectedHeader, joseHeader);
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if (joseHeader.zip !== undefined) {
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throw new JOSENotSupported('JWE "zip" (Compression Algorithm) Header Parameter is not supported.');
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}
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const { alg, enc } = joseHeader;
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if (typeof alg !== 'string' || !alg) {
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throw new JWEInvalid('JWE "alg" (Algorithm) Header Parameter missing or invalid');
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}
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if (typeof enc !== 'string' || !enc) {
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throw new JWEInvalid('JWE "enc" (Encryption Algorithm) Header Parameter missing or invalid');
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}
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let encryptedKey;
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if (this._cek && (alg === 'dir' || alg === 'ECDH-ES')) {
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throw new TypeError(`setContentEncryptionKey cannot be called with JWE "alg" (Algorithm) Header ${alg}`);
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}
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let cek;
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{
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let parameters;
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({ cek, encryptedKey, parameters } = await encryptKeyManagement(alg, enc, key, this._cek, this._keyManagementParameters));
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if (parameters) {
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if (options && unprotected in options) {
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if (!this._unprotectedHeader) {
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this.setUnprotectedHeader(parameters);
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}
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else {
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this._unprotectedHeader = { ...this._unprotectedHeader, ...parameters };
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}
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}
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else if (!this._protectedHeader) {
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this.setProtectedHeader(parameters);
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}
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else {
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this._protectedHeader = { ...this._protectedHeader, ...parameters };
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}
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}
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}
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let additionalData;
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let protectedHeader;
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let aadMember;
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if (this._protectedHeader) {
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protectedHeader = encoder.encode(base64url(JSON.stringify(this._protectedHeader)));
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}
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else {
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protectedHeader = encoder.encode('');
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}
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if (this._aad) {
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aadMember = base64url(this._aad);
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additionalData = concat(protectedHeader, encoder.encode('.'), encoder.encode(aadMember));
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}
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else {
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additionalData = protectedHeader;
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}
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const { ciphertext, tag, iv } = await encrypt(enc, this._plaintext, cek, this._iv, additionalData);
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const jwe = {
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ciphertext: base64url(ciphertext),
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};
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if (iv) {
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jwe.iv = base64url(iv);
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}
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if (tag) {
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jwe.tag = base64url(tag);
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}
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if (encryptedKey) {
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jwe.encrypted_key = base64url(encryptedKey);
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}
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if (aadMember) {
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jwe.aad = aadMember;
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}
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if (this._protectedHeader) {
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jwe.protected = decoder.decode(protectedHeader);
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}
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if (this._sharedUnprotectedHeader) {
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jwe.unprotected = this._sharedUnprotectedHeader;
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}
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if (this._unprotectedHeader) {
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jwe.header = this._unprotectedHeader;
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}
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return jwe;
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}
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}
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