113 lines
3.2 KiB
JavaScript
113 lines
3.2 KiB
JavaScript
var Key = require('../key');
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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 Stealth = function Stealth(payloadKey, scanKey) {
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if (!(this instanceof Stealth))
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return new Stealth(payloadKey, scanKey);
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this.payloadKey = payloadKey;
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this.scanKey = scanKey;
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};
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Stealth.prototype.fromAddressBuffer = function(buf) {
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if (!Buffer.isBuffer(buf) || buf.length !== 66)
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throw new Error('stealth: 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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var payloadPubkey = Pubkey().fromDER(pPubBuf);
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this.payloadKey = Key(undefined, payloadPubkey);
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var scanPubkey = Pubkey().fromDER(sPubBuf);
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this.scanKey = Key(undefined, scanPubkey);
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return this;
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};
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Stealth.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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Stealth.prototype.fromRandom = function() {
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this.payloadKey = Key().fromRandom();
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this.scanKey = Key().fromRandom();
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return this;
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};
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Stealth.prototype.getSharedKeyAsReceiver = function(senderPubkey) {
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var sharedSecretPoint = senderPubkey.point.mul(this.scanKey.privkey.bn);
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var sharedSecretPubkey = Pubkey(sharedSecretPoint);
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var buf = sharedSecretPubkey.toDER(true);
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var sharedKey = KDF.sha256hmac2key(buf);
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return sharedKey;
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};
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Stealth.prototype.getSharedKeyAsSender = function(senderKey) {
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var sharedSecretPoint = this.scanKey.pubkey.point.mul(senderKey.privkey.bn);
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var sharedSecretPubkey = Pubkey(sharedSecretPoint);
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var buf = sharedSecretPubkey.toDER(true);
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var sharedKey = KDF.sha256hmac2key(buf);
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return sharedKey;
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};
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Stealth.prototype.getReceivePubkeyAsReceiver = function(senderPubkey) {
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var sharedKey = this.getSharedKeyAsReceiver(senderPubkey);
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var pubkey = Pubkey(this.payloadKey.pubkey.point.add(sharedKey.pubkey.point));
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return pubkey;
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};
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Stealth.prototype.getReceivePubkeyAsSender = function(senderKey) {
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var sharedKey = this.getSharedKeyAsSender(senderKey);
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var pubkey = Pubkey(this.payloadKey.pubkey.point.add(sharedKey.pubkey.point));
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return pubkey;
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};
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Stealth.prototype.getReceiveKey = function(senderPubkey) {
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var sharedKey = this.getSharedKeyAsReceiver(senderPubkey);
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var privkey = Privkey(this.payloadKey.privkey.bn.add(sharedKey.privkey.bn).mod(Point.getN()));
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var key = Key(privkey);
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key.privkey2pubkey();
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return key;
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};
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Stealth.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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Stealth.prototype.toAddressBuffer = function() {
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var pBuf = this.payloadKey.pubkey.toDER(true);
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var sBuf = this.scanKey.pubkey.toDER(true);
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return Buffer.concat([pBuf, sBuf]);
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};
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Stealth.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 = Stealth;
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