/
taquito-ledger-signer.ts
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taquito-ledger-signer.ts
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/**
* @packageDocumentation
* @module @taquito/ledger-signer
*/
import { Signer } from '@taquito/taquito';
import Transport from '@ledgerhq/hw-transport';
import { b58cencode, prefix, Prefix, ProhibitedActionError } from '@taquito/utils';
import {
appendWatermark,
transformPathToBuffer,
compressPublicKey,
chunkOperation,
validateResponse,
extractValue,
} from './utils';
import { hash } from '@stablelib/blake2b';
import {
PublicKeyHashRetrievalError,
PublicKeyRetrievalError,
InvalidLedgerResponseError,
} from './error';
export type LedgerTransport = Pick<Transport, 'send' | 'decorateAppAPIMethods' | 'setScrambleKey'>;
export enum DerivationType {
ED25519 = 0x00, // tz1
SECP256K1 = 0x01, // tz2
P256 = 0x02, // tz3
BIP32_ED25519 = 0x03, // tz1 BIP32
}
/**
* @category Error
* @description Error that indicates an invalid derivation type being passed or used
*/
export class InvalidDerivationTypeError extends Error {
public name = 'InvalidDerivationTypeError';
constructor(public derivationType: string) {
super(
`The derivation type ${derivationType} is invalid. The derivation type must be DerivationType.ED25519, DerivationType.SECP256K1, DerivationType.P256 or DerivationType.BIP32_ED25519`
);
}
}
/**
* @category Error
* @description Error that indicates an invalid derivation path being passed or used
*/
export class InvalidDerivationPathError extends Error {
public name = 'InvalidDerivationPathError';
constructor(public derivationPath: string) {
super(
`The derivation path ${derivationPath} is invalid. The derivation path must start with 44'/1729`
);
}
}
export const HDPathTemplate = (account: number) => {
return `44'/1729'/${account}'/0'`;
};
export { VERSION } from './version';
/**
*
* @description Implementation of the Signer interface that will allow signing operation from a Ledger Nano device
*
* @param transport A transport instance from LedgerJS libraries depending on the platform used (e.g. Web, Node)
* @param path The ledger derivation path (default is "44'/1729'/0'/0'")
* @param prompt Whether to prompt the ledger for public key (default is true)
* @param derivationType The value which defines the curve to use (DerivationType.ED25519(default), DerivationType.SECP256K1, DerivationType.P256, DerivationType.BIP32_ED25519)
*
* @example
* ```
* import TransportNodeHid from "@ledgerhq/hw-transport-node-hid";
* const transport = await TransportNodeHid.create();
* const ledgerSigner = new LedgerSigner(transport, "44'/1729'/0'/0'", false, DerivationType.ED25519);
* ```
*
* @example
* ```
* import TransportU2F from "@ledgerhq/hw-transport-u2f";
* const transport = await TransportU2F.create();
* const ledgerSigner = new LedgerSigner(transport, "44'/1729'/0'/0'", true, DerivationType.SECP256K1);
* ```
*
* @example
* ```
* import TransportU2F from "@ledgerhq/hw-transport-u2f";
* const transport = await TransportU2F.create();
* const ledgerSigner = new LedgerSigner(transport, "44'/1729'/6'/0'", true, DerivationType.BIP32_ED25519);
* ```
*/
export class LedgerSigner implements Signer {
// constants for APDU requests (https://github.com/obsidiansystems/ledger-app-tezos/blob/master/APDUs.md)
private readonly CLA = 0x80; // Instruction class (always 0x80)
private readonly INS_GET_PUBLIC_KEY = 0x02; // Instruction code to get the ledger’s internal public key without prompt
private readonly INS_PROMPT_PUBLIC_KEY = 0x03; // Instruction code to get the ledger’s internal public key with prompt
private readonly INS_SIGN = 0x04; // Sign a message with the ledger’s key
private readonly FIRST_MESSAGE_SEQUENCE = 0x00;
private readonly LAST_MESSAGE_SEQUENCE = 0x81;
private readonly OTHER_MESSAGE_SEQUENCE = 0x01;
private _publicKey?: string;
private _publicKeyHash?: string;
constructor(
private transport: LedgerTransport,
private path: string = "44'/1729'/0'/0'",
private prompt: boolean = true,
private derivationType: DerivationType = DerivationType.ED25519
) {
this.transport.setScrambleKey('XTZ');
if (!path.startsWith("44'/1729'")) {
throw new InvalidDerivationPathError(path);
}
if (!Object.values(DerivationType).includes(derivationType)) {
throw new InvalidDerivationTypeError(derivationType.toString());
}
}
async publicKeyHash(): Promise<string> {
if (!this._publicKeyHash) {
await this.publicKey();
}
if (this._publicKeyHash) {
return this._publicKeyHash;
}
throw new PublicKeyHashRetrievalError();
}
async publicKey(): Promise<string> {
if (this._publicKey) {
return this._publicKey;
}
const responseLedger = await this.getLedgerPublicKey();
const publicKeyLength = responseLedger[0];
const rawPublicKey = responseLedger.slice(1, 1 + publicKeyLength);
const compressedPublicKey = compressPublicKey(rawPublicKey, this.derivationType);
const prefixes = this.getPrefixes();
const publicKey = b58cencode(compressedPublicKey, prefixes.prefPk);
const publicKeyHash = b58cencode(hash(compressedPublicKey, 20), prefixes.prefPkh);
this._publicKey = publicKey;
this._publicKeyHash = publicKeyHash;
return publicKey;
}
private async getLedgerPublicKey(): Promise<Buffer> {
try {
let ins = this.INS_PROMPT_PUBLIC_KEY;
if (this.prompt === false) {
ins = this.INS_GET_PUBLIC_KEY;
}
const responseLedger = await this.transport.send(
this.CLA,
ins,
this.FIRST_MESSAGE_SEQUENCE,
this.derivationType,
transformPathToBuffer(this.path)
);
return responseLedger;
} catch (error) {
throw new PublicKeyRetrievalError();
}
}
async secretKey(): Promise<string> {
throw new ProhibitedActionError('Secret key cannot be exposed');
}
async sign(bytes: string, watermark?: Uint8Array) {
const watermarkedBytes = appendWatermark(bytes, watermark);
const watermarkedBytes2buff = Buffer.from(watermarkedBytes, 'hex');
let messageToSend = [];
messageToSend.push(transformPathToBuffer(this.path));
messageToSend = chunkOperation(messageToSend, watermarkedBytes2buff);
const ledgerResponse = await this.signWithLedger(messageToSend);
let signature;
if (
this.derivationType === DerivationType.ED25519 ||
this.derivationType === DerivationType.BIP32_ED25519
) {
signature = ledgerResponse.slice(0, ledgerResponse.length - 2).toString('hex');
} else {
if (!validateResponse(ledgerResponse)) {
throw new InvalidLedgerResponseError('Cannot parse ledger response');
}
const idxLengthRVal = 3; // Third element of response is length of r value
const rValue = extractValue(idxLengthRVal, ledgerResponse);
const idxLengthSVal = rValue.idxValueStart + rValue.length + 1;
const sValue = extractValue(idxLengthSVal, ledgerResponse);
const signatureBuffer = Buffer.concat([rValue.buffer, sValue.buffer]);
signature = signatureBuffer.toString('hex');
}
return {
bytes,
sig: b58cencode(signature, prefix[Prefix.SIG]),
prefixSig: b58cencode(signature, this.getPrefixes().prefSig),
sbytes: bytes + signature,
};
}
private async signWithLedger(message: Buffer[]): Promise<Buffer> {
// first element of the message represents the path
let ledgerResponse = await this.transport.send(
this.CLA,
this.INS_SIGN,
this.FIRST_MESSAGE_SEQUENCE,
this.derivationType,
message[0]
);
for (let i = 1; i < message.length; i++) {
const p1 =
i === message.length - 1 ? this.LAST_MESSAGE_SEQUENCE : this.OTHER_MESSAGE_SEQUENCE;
ledgerResponse = await this.transport.send(
this.CLA,
this.INS_SIGN,
p1,
this.derivationType,
message[i]
);
}
return ledgerResponse;
}
private getPrefixes() {
if (
this.derivationType === DerivationType.ED25519 ||
this.derivationType === DerivationType.BIP32_ED25519
) {
return {
prefPk: prefix[Prefix.EDPK],
prefPkh: prefix[Prefix.TZ1],
prefSig: prefix[Prefix.EDSIG],
};
} else if (this.derivationType === DerivationType.SECP256K1) {
return {
prefPk: prefix[Prefix.SPPK],
prefPkh: prefix[Prefix.TZ2],
prefSig: prefix[Prefix.SPSIG],
};
} else {
return {
prefPk: prefix[Prefix.P2PK],
prefPkh: prefix[Prefix.TZ3],
prefSig: prefix[Prefix.P2SIG],
};
}
}
}