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generateKey

Open source

generateKey

The generateKey() generates a new cryptographic key and returns it as a CryptoKey object or a CryptoKeyPair object that can be used with the Web Crypto API.

Usage

generateKey(algorithm, extractable, keyUsages)

Parameters

Name	Type	Description
`algorithm`	a `string` or algorithm object with a single `name` string	The type of key to generate. It can be either a string with any of the currently supported algorithms as a value or any of the generation key parameter objects.
`extractable`	`boolean`	Whether the key can be exported using exportKey.
`keyUsages`	`Array<string>`	An array of strings describing what operations can be performed with the key. Key usages could vary depending on the algorithm.

Supported algorithms

AES-CBC	AES-CTR	AES-GCM	AES-KW	ECDH	ECDSA	HMAC	RSA-OAEP	RSASSA-PKCS1-v1_5	RSA-PSS
✅ AesCbcParams	✅ AesCtrParams	✅ AesGcmParams	❌	✅ EcdhKeyDeriveParams	✅ EcdsaParams	✅ HmacKeyGenParams	✅ RsaHashedImportParams	✅ RsaHashedImportParams	✅ RsaHashedImportParams

Return Value

A Promise that resolves with the generated key as a CryptoKey object or a CryptoKeyPair object.

Algorithm specific input

	HMAC	AES	ECDH	ECDSA	RSA-OAEP	RSASSA-PKCS1-v1_5	RSA-PSS
Parameters type to use	`HmacKeyGenParams`	`AesKeyGenParams`	`EcKeyGenParams`	`EcKeyGenParams`	`RSAHashedKeyGenParams`	`RSAHashedKeyGenParams`	`RSAHashedKeyGenParams`
Possible key usages	`sign`, `verify`	`encrypt`, `decrypt`	`deriveKey`, `deriveBits`	`sign`, `verify`	`encrypt`, `decrypt`	`sign`, `verify`	`sign`, `verify`

Throws

Type	Description
`SyntaxError`	Raised when the `keyUsages` parameter is empty, but the key is of type `secret` or `private`.

Example

export default async function () {
  const key = await crypto.subtle.generateKey(
    {
      name: 'AES-CBC',
      length: 256,
    },
    true,
    ['encrypt', 'decrypt']
  );

  console.log(JSON.stringify(key));
}