54 lines
1.7 KiB
JavaScript
54 lines
1.7 KiB
JavaScript
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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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//The person sending must have a keypair.
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//It is best to make a new one for each message sent.
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var keypair = Keypair().fromRandom();
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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, 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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//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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