88 lines
2.3 KiB
JavaScript
88 lines
2.3 KiB
JavaScript
var Stealthkey = require('./stealthkey');
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var Base58check = require('../base58check');
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var Pubkey = require('../pubkey');
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var KDF = require('../kdf');
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var StealthAddress = function StealthAddress(addrstr) {
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if (!(this instanceof StealthAddress))
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return new StealthAddress(addrstr);
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if (typeof addrstr === 'string') {
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this.fromString(addrstr)
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}
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else if (Buffer.isBuffer(addrstr)) {
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var buf = addrstr;
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this.fromBuffer(buf);
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}
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else if (addrstr) {
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var obj = addrstr;
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this.set(obj);
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}
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};
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StealthAddress.prototype.set = function(obj) {
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this.payloadPubkey = obj.payloadPubkey || this.payloadPubkey;
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this.scanPubkey = obj.scanPubkey || this.scanPubkey;
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return this;
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};
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StealthAddress.prototype.fromStealthkey = function(stealthkey) {
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this.set({
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payloadPubkey: stealthkey.payloadKeypair.pubkey,
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scanPubkey: stealthkey.scanKeypair.pubkey
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});
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return this;
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};
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StealthAddress.prototype.fromBuffer = function(buf) {
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if (!Buffer.isBuffer(buf) || buf.length !== 66)
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throw new Error('stealthkey: A stealth 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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this.payloadPubkey = Pubkey().fromDER(pPubBuf);
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this.scanPubkey = Pubkey().fromDER(sPubBuf);
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return this;
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};
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StealthAddress.prototype.fromString = function(str) {
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var buf = Base58check.decode(str);
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this.fromBuffer(buf);
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return this;
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};
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StealthAddress.prototype.getSharedKeypair = function(senderKeypair) {
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var sharedSecretPoint = this.scanPubkey.point.mul(senderKeypair.privkey.bn);
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var sharedSecretPubkey = Pubkey(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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StealthAddress.prototype.getReceivePubkey = function(senderKeypair) {
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var sharedKeypair = this.getSharedKeypair(senderKeypair);
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var pubkey = Pubkey(this.scanPubkey.point.add(sharedKeypair.pubkey.point).add(this.payloadPubkey.point));
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return pubkey;
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};
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StealthAddress.prototype.toBuffer = function() {
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var pBuf = this.payloadPubkey.toDER(true);
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var sBuf = this.scanPubkey.toDER(true);
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return Buffer.concat([pBuf, sBuf]);
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};
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StealthAddress.prototype.toString = function() {
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var buf = this.toBuffer();
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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 = StealthAddress;
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