hxBitcoin - the Bitcoin, cryptocurrency and cryptography library for Haxe

Features

Bitcoin

• BIP0038 (encrypted private keys)
• WIF
• Convert private keys to public keys & addresses
• Base58

Crypto

• scrypt
• AES
• SHA-1, SHA-256, RIPEMD160
• Elliptic curve arithmetic
• secp256k1 & NIST curves

Other

• Modular arithmetic (Fp)
• Arbitrary-size (big) integer
• Unicode 7.0
• Extensive test suite of over 22,000 individual tests and vectors
• Pure Haxe implementation
• No additional/external dependencies

Supported Platforms & Targets

• iOS (C++)
• Windows (C++)
• Mac OSX (C++)
• Linux (C++)
• AS3/Flash
• Neko
• Request more...

Installation

haxelib install hxBitcoin

To use in your Haxe project, build with this:

haxe -lib hxBitcoin ...

To use in your lime/NME project, at this to your project's application.xml file:

<haxelib name="hxBitcoin"/>

Examples

Convert private key to address

import com.fundoware.engine.bitcoin.FunBitcoinContext;
import com.fundoware.engine.bitcoin.FunBitcoinPrivateKey;

var context = new FunBitcoinContext();
var privKey = FunBitcoinPrivateKey.fromString(context, "5KN7MzqK5wt2TP1fQCYyHBtDrXdJuXbUzm4A9rKAteGu3Qi5CVR");
trace("private key = " + privKey.toBytes().toHex());
var address = privKey.toAddress();
privKey.clear();
trace("address = " + address);

haxe -lib hxBitcoin -main Example.hx -neko example.n && neko example.n
Example.hx:10: private key (hex) = cbf4b9f70470856bb4f40f80b87edb90865997ffee6df315ab166d713af433a5
Example.hx:13: address = 1Jq6MksXQVWzrznvZzxkV6oY57oWXD9TXB

Decrypt BIP0038 private key

import com.fundoware.engine.bitcoin.FunBitcoinContext;
import com.fundoware.engine.bitcoin.FunBitcoinEncryptedPrivateKey;
import com.fundoware.engine.bitcoin.FunBitcoinPrivateKey;

var context = new FunBitcoinContext();
var encryptedKey = FunBitcoinEncryptedPrivateKey.fromString(context, "6PRVWUbkzzsbcVac2qwfssoUJAN1Xhrg6bNk8J7Nzm5H7kxEbn2Nh2ZoGg");
var decryptedKey = encryptedKey.decryptString("TestingOneTwoThree");
encryptedKey.clear();
trace("private key (WIF) = " + decryptedKey.toWIF());
var address = decryptedKey.toAddress();
decryptedKey.clear();
trace("address = " + address);

haxe -lib hxBitcoin -main Example.hx -neko example.n && neko example.n
Example.hx:23: private key (WIF) = 5KN7MzqK5wt2TP1fQCYyHBtDrXdJuXbUzm4A9rKAteGu3Qi5CVR
Example.hx:26: address = 1Jq6MksXQVWzrznvZzxkV6oY57oWXD9TXB

License

hxBitcoin is offered under the MIT license. See LICENSE.txt.

Change Log

See CHANGES.md.

Security Notes

Thoughtful care is needed when dealing with any security-sensitive application.

Some non-exhaustive consideration has been given to security concerns when authoring this library.

In particular, no special effort has been made (yet) to deal with side channel attacks such as timing attacks.

This software is only as secure as the machine, system, and process running it. If another process (privileged or otherwise) gains access to the software's memory, sensitive data such as private keys can be discovered.

This particular vector can be mitigated somewhat by consistent use of the clear() method found on classes that implement the FunIClearable interface to wipe sensitive data from objects as early as possible. However even by applying this strategy it cannot be guaranteed that all sensitive data will be cleared in all cases. Due to the behavior or semantics of the underlying language, framework, and/or runtime environment it is possible that copies of sensitive data can be created outside the control of this software.

Should you find any specific security issues, kindly report the issue to the contact below.

To Do

• Documentation
• HD wallets / BIP0032 & BIP0044
• ECDSA
• RFC 6979
• Confirmation codes for BIP0038
• Decompression of public keys
• Blockchain data structures
• QR code generation
• Harden against timing attacks
• More targets
• Performance optimization

Why Haxe?

• Target C++, Java, JS, PHP, AS3 and more--with a single code base
• Extends reach to desktop, mobile, web, and server platforms
• Performant
• Vibrant and passionate community

Contact

Questions, issues, feature, priority, and additional target requests welcome!

Chuck Batson
fundoware+hxbitcoin@gmail.com
http://github.com/cbatson