79d79012d4
It should be possible to check to see if a message isForMe with only the scanKeypair, and not the payloadKeypair. There was a bug where only the scanKeypair was being used to produce the receiveKeypair, but this was a mistake. Both the scanPubkey and payloadPubkey should be necessary to produce the receivePubkey, and both the scanPrivkey and payloadPrivkey should be necessary to produce the receivePrivkey. If an online computer has only the public keys of both (and the scanPrivkey), then that is good enough to check for isForMe.
64 lines
2.0 KiB
JavaScript
64 lines
2.0 KiB
JavaScript
var Pubkey = require('../lib/pubkey');
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var Address = require('../lib/address');
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var Stealthkey = require('../lib/expmt/stealthkey');
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var StealthAddress = require('../lib/expmt/stealthaddress');
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var StealthMessage = require('../lib/expmt/stealthmessage');
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var Keypair = require('../lib/keypair')
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//First, the person receiving must make a stealth key.
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var sk = Stealthkey().fromRandom();
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//It has an associated stealth address.
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var sa = StealthAddress().fromStealthkey(sk);
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console.log('Stealth address: ' + sa);
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//Now make a message.
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var messagebuf = new Buffer('Hello there. Only you know this message is to you, and only you know what it says.');
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//Encrypt the message with the stealth address.
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var encbuf = StealthMessage.encrypt(messagebuf, sa);
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console.log('Hex of the encrypted message: ' + encbuf.toString('hex'));
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//Note that the first 20 bytes are a pubkeyhash, which may be interpreted as a bitcoin address.
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//This address has never been seen before in public.
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var address = Address().set({hashbuf: encbuf.slice(0, 20)});
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console.log('The randomly generated address the message is to: ' + address);
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//And the next 33 bytes are a nonce public key, which the message is "from".
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//It has never been seen before in public.
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var pubkey = Pubkey().fromDER(encbuf.slice(20, 20 + 33));
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console.log('Nonce public key: ' + pubkey);
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//The owner of the stealth key can check to see if it is for them.
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console.log('Is the message for me? ' + (StealthMessage.isForMe(encbuf, sk) ? "yes" : "no"));
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//The owner can decrypt it.
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var messagebuf2 = StealthMessage.decrypt(encbuf, sk);
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console.log('Decrypted message: ' + messagebuf2.toString());
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//If you do not have the payload privkey, you can still use isForMe.
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sk.payloadKeypair.privkey = undefined;
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console.log('Without payload privkey, is the message for me? ' + (StealthMessage.isForMe(encbuf, sk) ? "yes" : "no"));
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//...but not decrypt
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try {
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StealthMessage.decrypt(encbuf, sk);
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} catch (e) {
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console.log("...but without the payload privkey, I can't decrypt.");
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}
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