src/lib/authToken.ts · bridge

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bridge/src/lib/authToken.ts

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1import { crypto } from 'bitcoinjs-lib';

2import { ecdsaSign } from 'secp256k1';

4import { WALLET_TYPES } from './constants';

5import { ledgerSignMessage } from './ledger';

6import { trezorSignMessage } from './trezor';

8const MESSAGE = 'Bridge Authentication Token';

10function signMessage(privateKey: Buffer) {

11 const msg = '\x19Ethereum Signed Message:\n' + MESSAGE.length + MESSAGE;

12 // #ecdsaSign requires a 32-byte buffer, hence sha256

13 const hashed = crypto.sha256(Buffer.from(msg));

14 const { signature } = ecdsaSign(Buffer.from(hashed), privateKey);

16 // add key recovery parameter

17 const ethSignature = new Uint8Array(65);

18 ethSignature.set(signature);

19 const v = (ethSignature[32] & 1) + 27;

20 ethSignature[64] = v;

22 return ethSignature;

25export const getAuthToken = async ({

26 wallet,

27 walletType,

28 walletHdPath,

29 web3,

30}) => {

31 if (walletType === WALLET_TYPES.METAMASK) {

32 return web3.eth.personal.sign(MESSAGE, wallet.address, '');

33 }

34 if (walletType === WALLET_TYPES.LEDGER) {

35 return ledgerSignMessage(MESSAGE, walletHdPath);

36 }

37 if (walletType === WALLET_TYPES.TREZOR) {

38 return trezorSignMessage(MESSAGE, walletHdPath);

39 }

41 const signature = signMessage(wallet.privateKey);

43 const token = `0x${Buffer.from(signature).toString('hex')}`;

45 return token;