ecdh.setPublicKey(public_key[, encoding])
Stability: 0 - Deprecated
Sets the EC Diffie-Hellman public key. Key encoding can be 'binary', 'hex' or 'base64'. If encoding is provided public_key is expected to be a string; otherwise a Buffer is expected.
Note that there is not normally a reason to call this method because ECDH only requires a private key and the other party's public key to compute the shared secret. Typically either ecdh.generateKeys() or ecdh.setPrivateKey() will be called. The ecdh.setPrivateKey() method attempts to generate the public point/key associated with the private key being set.
Example (obtaining a shared secret):
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | const crypto = require('crypto');const alice = crypto.createECDH('secp256k1');const bob = crypto.createECDH('secp256k1');// Note: This is a shortcut way to specify one of Alice's previous private// keys. It would be unwise to use such a predictable private key in a real// application.alice.setPrivateKey( crypto.createHash('sha256').update('alice', 'utf8').digest());// Bob uses a newly generated cryptographically strong// pseudorandom key pair bob.generateKeys();const alice_secret = alice.computeSecret(bob.getPublicKey(), null, 'hex');const bob_secret = bob.computeSecret(alice.getPublicKey(), null, 'hex');// alice_secret and bob_secret should be the same shared secret valueconsole.log(alice_secret === bob_secret); |
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