@meterio/devkit
Version:
Typescript library to aid DApp development on Meter network
85 lines • 6.9 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.secp256k1 = void 0;
const crypto_1 = require("crypto");
const elliptic_1 = require("elliptic");
const curve = new elliptic_1.ec('secp256k1');
const N = Buffer.from('fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141', 'hex');
const ZERO = Buffer.alloc(32, 0);
function isValidPrivateKey(key) {
return Buffer.isBuffer(key) && key.length === 32 && !key.equals(ZERO) && key.compare(N) < 0;
}
function isValidMessageHash(hash) {
return Buffer.isBuffer(hash) && hash.length === 32;
}
/** secp256k1 methods set */
var secp256k1;
(function (secp256k1) {
/**
* generate private key
* @param rng the optional random number generator, which exactly generates 32 random bytes
*/
function generatePrivateKey(rng) {
rng = rng || (() => (0, crypto_1.randomBytes)(32));
for (;;) {
const privKey = rng();
if (isValidPrivateKey(privKey)) {
return privKey;
}
}
}
secp256k1.generatePrivateKey = generatePrivateKey;
/**
* derive public key(uncompressed) from private key
* @param privKey the private key
*/
function derivePublicKey(privKey) {
if (!isValidPrivateKey(privKey)) {
throw new Error('invalid private key');
}
const keyPair = curve.keyFromPrivate(privKey);
return Buffer.from(keyPair.getPublic().encode('array', false));
}
secp256k1.derivePublicKey = derivePublicKey;
/**
* sign a message using elliptic curve algorithm on the curve secp256k1
* @param msgHash hash of message
* @param privKey serialized private key
*/
function sign(msgHash, privKey) {
if (!isValidMessageHash(msgHash)) {
throw new Error('invalid message hash');
}
if (!isValidPrivateKey(privKey)) {
throw new Error('invalid private key');
}
const keyPair = curve.keyFromPrivate(privKey);
const sig = keyPair.sign(msgHash, { canonical: true });
const r = Buffer.from(sig.r.toArray('be', 32));
const s = Buffer.from(sig.s.toArray('be', 32));
return Buffer.concat([r, s, Buffer.from([sig.recoveryParam])]);
}
secp256k1.sign = sign;
/**
* recovery signature to public key
* @param msgHash hash of message
* @param sig signature
*/
function recover(msgHash, sig) {
if (!isValidMessageHash(msgHash)) {
throw new Error('invalid message hash');
}
if (!Buffer.isBuffer(sig) || sig.length !== 65) {
throw new Error('invalid signature');
}
const recovery = sig[64];
if (recovery !== 0 && recovery !== 1) {
throw new Error('invalid signature recovery');
}
const r = sig.slice(0, 32);
const s = sig.slice(32, 64);
return Buffer.from(curve.recoverPubKey(msgHash, { r, s }, recovery).encode('array', false));
}
secp256k1.recover = recover;
})(secp256k1 = exports.secp256k1 || (exports.secp256k1 = {}));
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