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✏️ Editing: encrypt.js Writable

import { concat, uint64be } from '../lib/buffer_utils.js';
import checkIvLength from '../lib/check_iv_length.js';
import checkCekLength from './check_cek_length.js';
import crypto, { isCryptoKey } from './webcrypto.js';
import { checkEncCryptoKey } from '../lib/crypto_key.js';
import invalidKeyInput from '../lib/invalid_key_input.js';
import { JOSENotSupported } from '../util/errors.js';
import { types } from './is_key_like.js';
async function cbcEncrypt(enc, plaintext, cek, iv, aad) {
    if (!(cek instanceof Uint8Array)) {
        throw new TypeError(invalidKeyInput(cek, 'Uint8Array'));
    }
    const keySize = parseInt(enc.slice(1, 4), 10);
    const encKey = await crypto.subtle.importKey('raw', cek.subarray(keySize >> 3), 'AES-CBC', false, ['encrypt']);
    const macKey = await crypto.subtle.importKey('raw', cek.subarray(0, keySize >> 3), {
        hash: `SHA-${keySize << 1}`,
        name: 'HMAC',
    }, false, ['sign']);
    const ciphertext = new Uint8Array(await crypto.subtle.encrypt({
        iv,
        name: 'AES-CBC',
    }, encKey, plaintext));
    const macData = concat(aad, iv, ciphertext, uint64be(aad.length << 3));
    const tag = new Uint8Array((await crypto.subtle.sign('HMAC', macKey, macData)).slice(0, keySize >> 3));
    return { ciphertext, tag };
}
async function gcmEncrypt(enc, plaintext, cek, iv, aad) {
    let encKey;
    if (cek instanceof Uint8Array) {
        encKey = await crypto.subtle.importKey('raw', cek, 'AES-GCM', false, ['encrypt']);
    }
    else {
        checkEncCryptoKey(cek, enc, 'encrypt');
        encKey = cek;
    }
    const encrypted = new Uint8Array(await crypto.subtle.encrypt({
        additionalData: aad,
        iv,
        name: 'AES-GCM',
        tagLength: 128,
    }, encKey, plaintext));
    const tag = encrypted.slice(-16);
    const ciphertext = encrypted.slice(0, -16);
    return { ciphertext, tag };
}
const encrypt = async (enc, plaintext, cek, iv, aad) => {
    if (!isCryptoKey(cek) && !(cek instanceof Uint8Array)) {
        throw new TypeError(invalidKeyInput(cek, ...types, 'Uint8Array'));
    }
    checkIvLength(enc, iv);
    switch (enc) {
        case 'A128CBC-HS256':
        case 'A192CBC-HS384':
        case 'A256CBC-HS512':
            if (cek instanceof Uint8Array)
                checkCekLength(cek, parseInt(enc.slice(-3), 10));
            return cbcEncrypt(enc, plaintext, cek, iv, aad);
        case 'A128GCM':
        case 'A192GCM':
        case 'A256GCM':
            if (cek instanceof Uint8Array)
                checkCekLength(cek, parseInt(enc.slice(1, 4), 10));
            return gcmEncrypt(enc, plaintext, cek, iv, aad);
        default:
            throw new JOSENotSupported('Unsupported JWE Content Encryption Algorithm');
    }
};
export default encrypt;

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