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bitcore
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update BIP32 to be able to derive pubkeys 

...using the new addCompressed interface in Key.js
This commit is contained in:
Ryan X. Charles 2014-03-23 15:12:52 -07:00
parent a686e63b0b
commit a4393c0657
2 changed files with 37 additions and 8 deletions
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36
BIP32.js
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@ -7,7 +7,7 @@ var crypto = require('crypto');
var networks = require('./networks');
var secp256k1_n = new bignum("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141", 16);
var secp256k1_G = new bignum("79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798", 16); //x coordinate
var secp256k1_Gx = new bignum("79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798", 16);
var BIP32 = function(bytes) {
if (bytes == 'mainnet' || bytes == 'livenet')
@ -266,17 +266,37 @@ BIP32.prototype.derive_child = function(i) {
var ir = hash.slice(32, 64);
// Ki = (IL + kpar)*G = IL*G + Kpar
var pub = new bignum(this.eckey.public, {size: 32});
var k = secp256k1_G.mul(il).add(pub);
var key = new Key();
key.private = il.toBuffer({size: 32});
key.regenerateSync();
key.compressed = false;
var oldkey = new Key();
oldkey.public = this.eckey.public;
oldkey.compressed = false;
var newpub = Key.addUncompressed(key.public, oldkey.public);
//compressed pubkey must start with 0x02 just like compressed G
var kbuf = Buffer.concat([new Buffer(0x02), k.toBuffer({size: 32})]);
var eckey = new Key();
eckey.compressed = false;
eckey.public = newpub;
if (eckey.public === null) {
console.log('invalid public key');
return this.derive_child(i+1);
}
eckey.compressed = true;
/*
if (k.gt(secp256k1_n))
return this.derive_child(i+1);
*/
ret = new BIP32();
ret.chain_code = new Buffer(ir);
ret.chain_code = new Buffer(ir);
ret.eckey = new Key();
ret.eckey.public = kbuf;
var eckey = new Key();
eckey.compressed = false;
eckey.public = newpub;
eckey.compressed = true;
ret.eckey = eckey;
ret.has_private_key = false;
}

9
test/test.BIP32.js
View File

@ -93,6 +93,15 @@ describe('BIP32', function() {
child.extended_public_key_string().should.equal(vector1_m0h1_public);
});
it("should get m/0'/1 ext. public key from m/0' public key from test vector 1", function() {
var bip32 = new BIP32(vector1_m_private);
var child = bip32.derive("m/0'");
var child_pub = new BIP32(child.extended_public_key_string());
var child2 = child_pub.derive("m/1");
should.exist(child2);
child2.extended_public_key_string().should.equal(vector1_m0h1_public);
});
it("should get m/0'/1/2h ext. private key from test vector 1", function() {
var bip32 = new BIP32(vector1_m_private);
var child = bip32.derive("m/0'/1/2'");