Node / markqvist / reticulum-cpp.git / files / src / Cryptography / HKDF.cpp

Displaying Raw • Download

#include "HKDF.h"

#include <HKDF.h>

#include <SHA256.h>

using namespace RNS;

const Bytes RNS::Cryptography::hkdf(size_t length, const Bytes& derive_from, const Bytes& salt /*= {Bytes::NONE}*/, const Bytes& context /*= {Bytes::NONE}*/) {

if (length <= 0) {

throw std::invalid_argument("Invalid output key length");

}

if (!derive_from) {

throw std::invalid_argument("Cannot derive key from empty input material");

}

HKDF<SHA256> hkdf;

if (salt) {

hkdf.setKey(derive_from.data(), derive_from.size(), salt.data(), salt.size());

}

else {

hkdf.setKey(derive_from.data(), derive_from.size());

}

Bytes derived;

hkdf.extract(derived.writable(length), length);

return derived;

}