118 lines
3.6 KiB
JavaScript
118 lines
3.6 KiB
JavaScript
var Keypair = require('../keypair');
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var Privkey = require('../privkey');
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var Pubkey = require('../pubkey');
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var Point = require('../point');
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var Hash = require('../hash');
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var KDF = require('../kdf');
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var base58check = require('../base58check');
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var Stealthkey = function Stealthkey(obj) {
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if (!(this instanceof Stealthkey))
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return new Stealthkey(obj);
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if (obj)
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this.set(obj);
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};
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Stealthkey.prototype.set = function(obj) {
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this.payloadKeypair = obj.payloadKeypair || this.payloadKeypair;
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this.scanKeypair = obj.scanKeypair || this.scanKeypair;
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return this;
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};
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Stealthkey.prototype.fromAddressBuffer = function(buf) {
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if (!Buffer.isBuffer(buf) || buf.length !== 66)
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throw new Error('stealthkey: A stealthkey address must have length 66');
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var pPubBuf = buf.slice(0, 33);
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var sPubBuf = buf.slice(33, 66);
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var payloadPubkey = Pubkey().fromDER(pPubBuf);
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this.payloadKeypair = Keypair({pubkey: payloadPubkey});
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var scanPubkey = Pubkey().fromDER(sPubBuf);
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this.scanKeypair = Keypair({pubkey: scanPubkey});
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return this;
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};
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Stealthkey.prototype.fromAddressString = function(str) {
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var buf = base58check.decode(str);
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this.fromAddressBuffer(buf);
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return this;
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};
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Stealthkey.prototype.fromRandom = function() {
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this.payloadKeypair = Keypair().fromRandom();
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this.scanKeypair = Keypair().fromRandom();
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return this;
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};
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Stealthkey.prototype.getSharedKeypairAsReceiver = function(senderPubkey) {
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var sharedSecretPoint = senderPubkey.point.mul(this.scanKeypair.privkey.bn);
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var sharedSecretPubkey = Pubkey({point: sharedSecretPoint});
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var buf = sharedSecretPubkey.toDER(true);
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var sharedKeypair = KDF.sha256hmac2keypair(buf);
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return sharedKeypair;
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};
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Stealthkey.prototype.getSharedKeypairAsSender = function(senderKeypair) {
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var sharedSecretPoint = this.scanKeypair.pubkey.point.mul(senderKeypair.privkey.bn);
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var sharedSecretPubkey = Pubkey({point: sharedSecretPoint});
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var buf = sharedSecretPubkey.toDER(true);
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var sharedKeypair = KDF.sha256hmac2keypair(buf);
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return sharedKeypair;
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};
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Stealthkey.prototype.getReceivePubkeyAsReceiver = function(senderPubkey) {
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var sharedKeypair = this.getSharedKeypairAsReceiver(senderPubkey);
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var pubkey = Pubkey({point: this.payloadKeypair.pubkey.point.add(sharedKeypair.pubkey.point)});
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return pubkey;
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};
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Stealthkey.prototype.getReceivePubkeyAsSender = function(senderKeypair) {
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var sharedKeypair = this.getSharedKeypairAsSender(senderKeypair);
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var pubkey = Pubkey({point: this.payloadKeypair.pubkey.point.add(sharedKeypair.pubkey.point)});
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return pubkey;
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};
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Stealthkey.prototype.getReceiveKeypair = function(senderPubkey) {
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var sharedKeypair = this.getSharedKeypairAsReceiver(senderPubkey);
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var privkey = Privkey({bn: this.payloadKeypair.privkey.bn.add(sharedKeypair.privkey.bn).mod(Point.getN())});
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var key = Keypair({privkey: privkey});
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key.privkey2pubkey();
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return key;
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};
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Stealthkey.prototype.isForMe = function(senderPubkey, myPossiblePubkeyhash) {
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var pubkey = this.getReceivePubkeyAsReceiver(senderPubkey);
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var pubkeybuf = pubkey.toDER(true);
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var pubkeyhash = Hash.sha256ripemd160(pubkeybuf);
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if (pubkeyhash.toString('hex') === myPossiblePubkeyhash.toString('hex'))
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return true;
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else
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return false;
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};
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Stealthkey.prototype.toAddressBuffer = function() {
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var pBuf = this.payloadKeypair.pubkey.toDER(true);
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var sBuf = this.scanKeypair.pubkey.toDER(true);
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return Buffer.concat([pBuf, sBuf]);
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};
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Stealthkey.prototype.toAddressString = function() {
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var buf = this.toAddressBuffer();
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var b58 = base58check.encode(buf);
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return b58;
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};
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module.exports = Stealthkey;
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