method

crypto.webcrypto.SubtleCrypto.deriveBits

length?: null | number

Using the method and parameters specified in algorithm and the keying material provided by baseKey, this method attempts to generate length bits. The Node.js implementation requires that when length is a number it must be multiple of 8. When length is null the maximum number of bits for a given algorithm is generated. This is allowed for the 'ECDH', 'X25519', and 'X448' algorithms. If successful, the returned promise will be resolved with an <ArrayBuffer> containing the generated data.

The algorithms currently supported include:

'Argon2d'
'Argon2i'
'Argon2id'
'ECDH'
'HKDF'
'PBKDF2'
'X25519'
'X448'

deriveBits(

algorithm: Argon2Params | EcdhKeyDeriveParams | HkdfParams | Pbkdf2Params,

baseKey: CryptoKey,

length: number

): Promise<ArrayBuffer>;

Referenced types

class ArrayBuffer

Represents a raw buffer of binary data, which is used to store data for the different typed arrays. ArrayBuffers cannot be read from or written to directly, but can be passed to a typed array or DataView Object to interpret the raw buffer as needed.

readonly [Symbol.toStringTag]: string
readonly byteLength: number
Read-only. The length of the ArrayBuffer (in bytes).
resize(
newByteLength?: number
): void;
Resizes the ArrayBuffer to the specified size (in bytes).
MDN
resize(
byteLength: number
): ArrayBuffer;
Resize an ArrayBuffer in-place.
slice(
begin: number,
end?: number
): ArrayBuffer;
Returns a section of an ArrayBuffer.
transfer(
newByteLength?: number
): ArrayBuffer;
Creates a new ArrayBuffer with the same byte content as this buffer, then detaches this buffer.
MDN
transferToFixedLength(
newByteLength?: number
): ArrayBuffer;
Creates a new non-resizable ArrayBuffer with the same byte content as this buffer, then detaches this buffer.
MDN