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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 | 1x 1x 1x 1x 1x 1x 1x 1x 64x 64x 64x 1x 1x 1x 1x 1x 1x 1x 1x | import { Account } from '../types';
import { bytesToHex, utf8ToBytes } from 'micro-stacks/common';
import { hashSha256 } from 'micro-stacks/crypto-sha';
import { HDKey, Versions } from '@scure/bip32';
import { isHardened } from '../utils';
const BITCOIN_VERSIONS: Versions = { private: 0x0488ade4, public: 0x0488b21e };
function hashCode(string: string): number {
let hash = 0;
Iif (string.length === 0) return hash;
for (let i = 0; i < string.length; i++) {
const character = string.charCodeAt(i);
hash = (hash << 5) - hash + character;
hash &= hash;
}
return hash & 0x7fffffff;
}
export function getAppPrivateKey(account: Account, appDomain: string, legacy = true): string {
if (legacy) return getLegacyAppPrivateKey(account, appDomain);
// Rather than using the `hashCode` function to derive an index for the child
// which makes it so there's a unreasonable high probability that someone can
// log into a new app (website) and it accidentally shares data with another one
//
// we want to use the `appDomain` + `salt` to generate a sha256 hash that is
// then used as the chaincode for the new app keychain
const chainCode = hashSha256(utf8ToBytes(`${appDomain}${account.salt}`));
const rootNode = HDKey.fromExtendedKey(account.appsKey);
Iif (!rootNode.privateKey) throw Error('no rootNode.privateKey');
const appKeychain = new HDKey({
privateKey: rootNode.privateKey,
chainCode,
versions: BITCOIN_VERSIONS,
}).deriveChild(isHardened(0));
Iif (!appKeychain.privateKey)
throw new Error('[micro-stacks/wallet-sdk] getAppPrivateKey: No private key found');
return bytesToHex(appKeychain.privateKey);
}
export function getLegacyAppPrivateKey(account: Account, appDomain: string): string {
const hashBuffer = bytesToHex(hashSha256(utf8ToBytes(`${appDomain}${account.salt}`)));
const appIndex = hashCode(hashBuffer);
const appKeychain = HDKey.fromExtendedKey(account.appsKey).deriveChild(isHardened(appIndex));
Iif (!appKeychain.privateKey)
throw new Error('[micro-stacks/wallet-sdk] getLegacyAppPrivateKey: No private key found');
return bytesToHex(appKeychain.privateKey);
}
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