/var/www/greso.tech/server/nsm/node_modules/jose/dist/node/esm/runtime
Edit: /var/www/greso.tech/server/nsm/node_modules/jose/dist/node/esm/runtime/decrypt.js (3297B)
import { createDecipheriv, KeyObject } from 'crypto';
import checkIvLength from '../lib/check_iv_length.js';
import checkCekLength from './check_cek_length.js';
import { concat } from '../lib/buffer_utils.js';
import { JOSENotSupported, JWEDecryptionFailed } from '../util/errors.js';
import timingSafeEqual from './timing_safe_equal.js';
import cbcTag from './cbc_tag.js';
import { isCryptoKey } from './webcrypto.js';
import { checkEncCryptoKey } from '../lib/crypto_key.js';
import isKeyObject from './is_key_object.js';
import invalidKeyInput from '../lib/invalid_key_input.js';
import supported from './ciphers.js';
import { types } from './is_key_like.js';
function cbcDecrypt(enc, cek, ciphertext, iv, tag, aad) {
const keySize = parseInt(enc.slice(1, 4), 10);
if (isKeyObject(cek)) {
cek = cek.export();
}
const encKey = cek.subarray(keySize >> 3);
const macKey = cek.subarray(0, keySize >> 3);
const macSize = parseInt(enc.slice(-3), 10);
const algorithm = `aes-${keySize}-cbc`;
if (!supported(algorithm)) {
throw new JOSENotSupported(`alg ${enc} is not supported by your javascript runtime`);
}
const expectedTag = cbcTag(aad, iv, ciphertext, macSize, macKey, keySize);
let macCheckPassed;
try {
macCheckPassed = timingSafeEqual(tag, expectedTag);
}
catch {
}
if (!macCheckPassed) {
throw new JWEDecryptionFailed();
}
let plaintext;
try {
const decipher = createDecipheriv(algorithm, encKey, iv);
plaintext = concat(decipher.update(ciphertext), decipher.final());
}
catch {
}
if (!plaintext) {
throw new JWEDecryptionFailed();
}
return plaintext;
}
function gcmDecrypt(enc, cek, ciphertext, iv, tag, aad) {
const keySize = parseInt(enc.slice(1, 4), 10);
const algorithm = `aes-${keySize}-gcm`;
if (!supported(algorithm)) {
throw new JOSENotSupported(`alg ${enc} is not supported by your javascript runtime`);
}
try {
const decipher = createDecipheriv(algorithm, cek, iv, { authTagLength: 16 });
decipher.setAuthTag(tag);
if (aad.byteLength) {
decipher.setAAD(aad, { plaintextLength: ciphertext.length });
}
const plaintext = decipher.update(ciphertext);
decipher.final();
return plaintext;
}
catch {
throw new JWEDecryptionFailed();
}
}
const decrypt = (enc, cek, ciphertext, iv, tag, aad) => {
let key;
if (isCryptoKey(cek)) {
checkEncCryptoKey(cek, enc, 'decrypt');
key = KeyObject.from(cek);
}
else if (cek instanceof Uint8Array || isKeyObject(cek)) {
key = cek;
}
else {
throw new TypeError(invalidKeyInput(cek, ...types, 'Uint8Array'));
}
checkCekLength(enc, key);
checkIvLength(enc, iv);
switch (enc) {
case 'A128CBC-HS256':
case 'A192CBC-HS384':
case 'A256CBC-HS512':
return cbcDecrypt(enc, key, ciphertext, iv, tag, aad);
case 'A128GCM':
case 'A192GCM':
case 'A256GCM':
return gcmDecrypt(enc, key, ciphertext, iv, tag, aad);
default:
throw new JOSENotSupported('Unsupported JWE Content Encryption Algorithm');
}
};
export default decrypt;