crypto.generateKeyPairSync(type, options)

• type: {string} Must be 'rsa', 'dsa', 'ec', 'ed25519', 'ed448', 'x25519', 'x448', or 'dh'.
• options: {Object}
  • modulusLength: {number} Key size in bits (RSA, DSA).
  • publicExponent: {number} Public exponent (RSA). Default: 0x10001.
  • divisorLength: {number} Size of q in bits (DSA).
  • namedCurve: {string} Name of the curve to use (EC).
  • prime: {Buffer} The prime parameter (DH).
  • primeLength: {number} Prime length in bits (DH).
  • generator: {number} Custom generator (DH). Default: 2.
  • groupName: {string} Diffie-Hellman group name (DH). See [crypto.getDiffieHellman()][].
  • publicKeyEncoding: {Object} See [keyObject.export()][].
  • privateKeyEncoding: {Object} See [keyObject.export()][].
• Returns: {Object}
  • publicKey: {string | Buffer | KeyObject}
  • privateKey: {string | Buffer | KeyObject}

Generates a new asymmetric key pair of the given type. RSA, DSA, EC, Ed25519, Ed448, X25519, X448, and DH are currently supported.

If a publicKeyEncoding or privateKeyEncoding was specified, this function behaves as if [keyObject.export()][] had been called on its result. Otherwise, the respective part of the key is returned as a [KeyObject][].

When encoding public keys, it is recommended to use 'spki'. When encoding private keys, it is recommended to use 'pks8' with a strong passphrase, and to keep the passphrase confidential.

const { generateKeyPairSync } = require('crypto');
const { publicKey, privateKey } = generateKeyPairSync('rsa', {
  modulusLength: 4096,
  publicKeyEncoding: {
    type: 'spki',
    format: 'pem',
  },
  privateKeyEncoding: {
    type: 'pkcs8',
    format: 'pem',
    cipher: 'aes-256-cbc',
    passphrase: 'top secret',
  },
});

The return value { publicKey, privateKey } represents the generated key pair. When PEM encoding was selected, the respective key will be a string, otherwise it will be a buffer containing the data encoded as DER.

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