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/*
* KDF defined in NIST SP 800-56c
* (C) 2016 Kai Michaelis
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/sp800_108.h>
#include <botan/sp800_56c.h>
#include <botan/hmac.h>
namespace Botan {
size_t SP800_56C::kdf(uint8_t key[], size_t key_len,
const uint8_t secret[], size_t secret_len,
const uint8_t salt[], size_t salt_len,
const uint8_t label[], size_t label_len) const
{
// Randomness Extraction
secure_vector< uint8_t > k_dk;
m_prf->set_key(salt, salt_len);
m_prf->update(secret, secret_len);
m_prf->final(k_dk);
// Key Expansion
m_exp->kdf(key, key_len, k_dk.data(), k_dk.size(), nullptr, 0, label, label_len);
return key_len;
}
}
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