key function

Uint8List key({ required Uint8List secret, required Uint8List salt, required Uint8List info, int length = 32, })

Derives a key from the secret, salt, and info using HKDF-SHA256, returning length bytes that can be used as a cryptographic key.

The salt is optional; pass an empty list for none.

Throws if length is negative or exceeds the maximum output length for SHA-256 HKDF, which is 255 * 32 = 8160 bytes.

Implementation

Uint8List key({
  required Uint8List secret,
  required Uint8List salt,
  required Uint8List info,
  int length = 32,
}) {
  _checkLength(length);
  return ffi.hkdfKey(
    secret: secret,
    salt: salt,
    info: info,
    length: BigInt.from(length),
  );
}