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import { get } from 'svelte/store';
import * as ecc from 'tiny-secp256k1';
import { generateMnemonic, entropyToMnemonic, mnemonicToEntropy, mnemonicToSeedSync } from 'bip39';
import { Buffer } from 'buffer';
import { bech32m } from 'bech32';
import { bip32, failure, wait, post, stretch } from '$lib/utils';
import { calculateId, signId } from 'nostr';
import { password as pw, passwordPrompt, pin, loginRedirect } from '$lib/store';
import { goto, invalidate } from '$app/navigation';
const { encode, decode, fromWords, toWords } = bech32m;
export let generate = async (user) => {
let password = get(pw);
let mnemonic, key, seed, entropy, cipher, salt, child;
if (!get(pin)?.length === 6) return;
mnemonic = generateMnemonic();
seed = mnemonicToSeedSync(mnemonic);
entropy = mnemonicToEntropy(mnemonic);
key = bip32.fromSeed(seed);
child = key.derivePath("m/44'/1237'/0'/0/0");
salt = crypto.getRandomValues(new Uint8Array(16));
let bytes = new Uint8Array(
await crypto.subtle.encrypt(
{ name: 'AES-GCM', iv: new Uint8Array(16) },
await stretch(password, salt),
Uint8Array.from(Buffer.from(entropy, 'hex'))
)
);
user.pubkey = Buffer.from(ecc.xOnlyPointFromPoint(child.publicKey)).toString('hex');
user.cipher = encode('en', toWords(bytes), 180);
user.salt = Buffer.from(salt).toString('hex');
};
export let encrypt = async ({ message, recipient, user }) => {
let sharedPoint = Buffer.from(
ecc.pointMultiply(
Uint8Array.from(Buffer.from('02' + recipient, 'hex')),
Buffer.from(await getPrivateKey(user), 'hex')
)
);
let iv = crypto.getRandomValues(new Uint8Array(16));
let cipher = await crypto.subtle.encrypt(
{ name: 'AES-CBC', iv },
await crypto.subtle.importKey('raw', sharedPoint.slice(1), 'AES-CBC', true, [
'encrypt',
'decrypt'
]),
new TextEncoder().encode(message)
);
return Buffer.from(cipher).toString('base64') + '?iv=' + Buffer.from(iv).toString('base64');
};
export let decrypt = async ({ event, user }) => {
try {
let { content, pubkey } = event;
if (pubkey === user.pubkey) pubkey = event.tags[0][1];
pubkey = Uint8Array.from(Buffer.from('02' + pubkey, 'hex'));
let sharedPoint = Buffer.from(
ecc.pointMultiply(pubkey, Buffer.from(await getPrivateKey(user), 'hex'))
);
let [cipher, iv] = content.split('?iv=');
cipher = Uint8Array.from(Buffer.from(cipher, 'base64'));
iv = Uint8Array.from(Buffer.from(iv, 'base64'));
let key = await crypto.subtle.importKey('raw', sharedPoint.slice(1), 'AES-CBC', true, [
'encrypt',
'decrypt'
]);
let message = await crypto.subtle.decrypt({ name: 'AES-CBC', iv }, key, cipher);
return Buffer.from(message).toString('utf8');
} catch (e) {
console.log(e);
}
};
function typedArrayToBuffer(array) {
return array.buffer.slice(array.byteOffset, array.byteLength + array.byteOffset);
}
let getPrivateKey = async (user) => {
let { cipher, username, salt } = user;
let password = get(pw);
if (!password) {
passwordPrompt.set(true);
}
try {
await post('/password', { password });
} catch (e) {
passwordPrompt.set(true);
}
await wait(() => !!get(pw));
password = get(pw);
let mnemonic, key, seed, entropy, child, privkey;
entropy = Buffer.from(
await crypto.subtle.decrypt(
{ name: 'AES-GCM', iv: new Uint8Array(16) },
await stretch(password, Buffer.from(salt, 'hex')),
Uint8Array.from(fromWords(decode(cipher, 180).words))
),
'hex'
).toString('hex');
mnemonic = entropyToMnemonic(entropy);
seed = mnemonicToSeedSync(mnemonic);
key = bip32.fromSeed(seed);
child = key.derivePath("m/44'/1237'/0'/0/0");
return child.privateKey;
};
export let sign = async ({ event, user }) => {
let privkey = await getPrivateKey(user);
event.id = await calculateId(event);
event.sig = await signId(privkey, event.id);
};
export let send = (event) => {
return post('/events', { event });
};
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