类: DiffieHellman

在DiffieHellman类的实例可以使用crypto.createDiffieHellman()函数创建。

const crypto = require('crypto');
const assert = require('assert');

// Generate Alice's keys...
const alice = crypto.createDiffieHellman(2048);
const aliceKey = alice.generateKeys();

// Generate Bob's keys...
const bob = crypto.createDiffieHellman(alice.getPrime(), alice.getGenerator());
const bobKey = bob.generateKeys();

// Exchange and generate the secret...
const aliceSecret = alice.computeSecret(bobKey);
const bobSecret = bob.computeSecret(aliceKey);

// OK
assert.strictEqual(aliceSecret.toString('hex'), bobSecret.toString('hex'));

diffieHellman.computeSecret(otherPublicKey[, inputEncoding][, outputEncoding])

• otherPublicKey {string | Buffer | TypedArray | DataView}
• inputEncoding {string} The [encoding][] of an otherPublicKey string.
• outputEncoding {string} The [encoding][] of the return value.
• Returns: {Buffer | string}

Computes the shared secret using otherPublicKey as the other party’s public key and returns the computed shared secret. The supplied key is interpreted using the specified inputEncoding, and secret is encoded using specified outputEncoding. If the inputEncoding is not provided, otherPublicKey is expected to be a [Buffer][], TypedArray, or DataView.

If outputEncoding is given a string is returned; otherwise, a [Buffer][] is returned.

diffieHellman.generateKeys([encoding])

• encoding {string} The [encoding][] of the return value.
• Returns: {Buffer | string}

Generates private and public Diffie-Hellman key values, and returns the public key in the specified encoding. This key should be transferred to the other party. If encoding is provided a string is returned; otherwise a [Buffer][] is returned.

diffieHellman.getGenerator([encoding])

• encoding {string} The [encoding][] of the return value.
• Returns: {Buffer | string}

Returns the Diffie-Hellman generator in the specified encoding. If encoding is provided a string is returned; otherwise a [Buffer][] is returned.

diffieHellman.getPrime([encoding])

• encoding {string} The [encoding][] of the return value.
• Returns: {Buffer | string}

Returns the Diffie-Hellman prime in the specified encoding. If encoding is provided a string is returned; otherwise a [Buffer][] is returned.

diffieHellman.getPrivateKey([encoding])

• encoding {string} The [encoding][] of the return value.
• Returns: {Buffer | string}

Returns the Diffie-Hellman private key in the specified encoding. If encoding is provided a string is returned; otherwise a [Buffer][] is returned.

diffieHellman.getPublicKey([encoding])

• encoding {string} The [encoding][] of the return value.
• Returns: {Buffer | string}

Returns the Diffie-Hellman public key in the specified encoding. If encoding is provided a string is returned; otherwise a [Buffer][] is returned.

diffieHellman.setPrivateKey(privateKey[, encoding])

• privateKey {string | Buffer | TypedArray | DataView}
• encoding {string} The [encoding][] of the privateKey string.

Sets the Diffie-Hellman private key. If the encoding argument is provided, privateKey is expected to be a string. If no encoding is provided, privateKey is expected to be a [Buffer][], TypedArray, or DataView.

diffieHellman.setPublicKey(publicKey[, encoding])

• publicKey {string | Buffer | TypedArray | DataView}
• encoding {string} The [encoding][] of the publicKey string.

Sets the Diffie-Hellman public key. If the encoding argument is provided, publicKey is expected to be a string. If no encoding is provided, publicKey is expected to be a [Buffer][], TypedArray, or DataView.

diffieHellman.verifyError

A bit field containing any warnings and/or errors resulting from a check performed during initialization of the DiffieHellman object.

The following values are valid for this property (as defined in constants module):

• DH_CHECK_P_NOT_SAFE_PRIME
• DH_CHECK_P_NOT_PRIME
• DH_UNABLE_TO_CHECK_GENERATOR
• DH_NOT_SUITABLE_GENERATOR

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