dart_ecpair

Description:

dart ecpair

dart_ecpair #
A library for managing SECP256k1 keypairs written in Dart.
Inspired by bitcoinjs/ecpair
Add Dependencies #
dart pub add dart_ecpair
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Example #
import 'dart:math';
import 'dart:typed_data';

import 'package:dart_bip32/dart_bip32.dart';
import 'package:dart_ecpair/dart_ecpair.dart';
import 'package:dart_ecpair/src/networks.dart';
import 'package:dart_ecpair/src/utils/random_bytes.dart';

void main() {
// From WIF
final keyPair1 =
ECPair.fromWIF('KynD8ZKdViVo5W82oyxvE18BbG6nZPVQ8Td8hYbwU94RmyUALUik');
print(keyPair1.toWIF());
// => KynD8ZKdViVo5W82oyxvE18BbG6nZPVQ8Td8hYbwU94RmyUALUik
// Random private key
final keyPair2 = ECPair.fromPrivateKey(randomBytes(32));
print(keyPair2.toWIF());
// => {Random WIF}
// OR (uses randombytes library, compatible with browser)
final keyPair3 = ECPair.makeRandom();
print(keyPair3.toWIF());
// => {Random WIF}

final random = Random.secure();
// OR use your own custom random buffer generator BE CAREFUL!!!!
Uint8List customRandomBufferFunc(int size) =>
Uint8List.fromList(List<int>.generate(size, (i) => random.nextInt(256)));

final keyPair4 =
ECPair.makeRandom(ECPairOptions(rng: customRandomBufferFunc));
print(keyPair4.toWIF());
// => {Random WIF}

// From pubkey (33 or 65 byte DER format public key)
final keyPair5 = ECPair.fromPublicKey(keyPair1.publicKey);
print(keyPair5.publicKeyHex);
// => 03a2529f752ad3986334ecef119600ffced36fc5853447e1b01ac0c30193b92c02

// Pass a custom network
final network = Network(
messagePrefix: '\x19Litecoin Signed Message:\n',
bip32: Bip32Type(
public: 0x019da462,
private: 0x019d9cfe,
),
pubKeyHash: 0x30,
scriptHash: 0x32,
wif: 0xb0,
bech32: ''); // Your custom network object here
final networkECPairOptions = ECPairOptions(network: network);
ECPair.makeRandom(networkECPairOptions);
ECPair.fromPrivateKey(customRandomBufferFunc(32), networkECPairOptions);
ECPair.fromPublicKey(keyPair1.publicKey, networkECPairOptions);
// fromWIF will check the WIF version against the network you pass in
// pass in multiple networks if you are not sure
ECPair.fromWIF(
'cTwJw1TREGFrFLARApkvLrEMNsksgqYWBYNPw6ES1U7yLfeSihjY', networks.testnet);
ECPair.fromWIF('T6tT4xL9LAUb16xz5w8MGrF3G5DkqHXHKQMNgNV7rGDX6yxjeSGj',
[networks.bitcoin, networks.testnet, networks.regtest, network]);
}
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TODO #

Add lower-r future to signing for sign with entropy.

LICENSE MIT #