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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