89 lines
2.5 KiB
JavaScript
89 lines
2.5 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 Stealthkey = function Stealthkey(payloadKeypair, scanKeypair) {
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if (!(this instanceof Stealthkey))
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return new Stealthkey(payloadKeypair, scanKeypair);
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if (payloadKeypair instanceof Keypair) {
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this.set({
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payloadKeypair: payloadKeypair,
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scanKeypair: scanKeypair
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});
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}
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else if (payloadKeypair) {
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var obj = payloadKeypair;
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this.set(obj);
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}
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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.fromJSON = function(json) {
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this.set({
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payloadKeypair: Keypair().fromJSON(json.payloadKeypair),
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scanKeypair: Keypair().fromJSON(json.scanKeypair)
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});
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return this;
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};
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Stealthkey.prototype.toJSON = function() {
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return {
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payloadKeypair: this.payloadKeypair.toJSON(),
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scanKeypair: this.scanKeypair.toJSON()
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};
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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.getSharedKeypair = 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.getReceivePubkey = function(senderPubkey) {
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var sharedKeypair = this.getSharedKeypair(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.getReceiveKeypair = function(senderPubkey) {
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var sharedKeypair = this.getSharedKeypair(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, myPossiblePubkeyhashbuf) {
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var pubkey = this.getReceivePubkey(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') === myPossiblePubkeyhashbuf.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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module.exports = Stealthkey;
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