getDiffieHellman
Creates a predefined DiffieHellmanGroup
key exchange object. The supported groups are listed in the documentation for DiffieHellmanGroup
.
The returned object mimics the interface of objects created by {@link createDiffieHellman}, but will not allow changing the keys (with diffieHellman.setPublicKey()
, for example). The advantage of using this method is that the parties do not have to generate nor exchange a group modulus beforehand, saving both processor and communication time.
Example (obtaining a shared secret):
const {
getDiffieHellman,
} = await import('node:crypto');
const alice = getDiffieHellman('modp14');
const bob = getDiffieHellman('modp14');
alice.generateKeys();
bob.generateKeys();
const aliceSecret = alice.computeSecret(bob.getPublicKey(), null, 'hex');
const bobSecret = bob.computeSecret(alice.getPublicKey(), null, 'hex');
// aliceSecret and bobSecret should be the same
console.log(aliceSecret === bobSecret);
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Since
v0.7.5