BcryptPbkdf.derive

ubyte[] derive(const(ubyte)[]  secret,  const(ubyte)[]  salt,
          size_t length)

Derives key material using the constructor's round count.

The derived key bytes, striped across blocks exactly

like the OpenBSD reference.

CryptoException if secret or salt is empty, or

length is zero or exceeds bcryptPbkdfMaxKey, or salt exceeds bcryptPbkdfMaxSalt.

ubyte[] derive(const(ubyte)[]  secret,  const(ubyte)[]  salt,
          size_t length,  KDFParams params)

Derives key material, letting params.iterations override the constructor's round count (zero means "unset").

`secret`	Passphrase bytes.
`salt`	Salt bytes.
`length`	Desired output length, 1..1024 bytes.
`params`	Algorithm parameters; only `iterations` is used.

The derived key bytes.

CryptoException for the derive conditions, or when

params.iterations is an explicit zero.