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/*
* KDF1 from ISO 18033-2
* (C) 2016 Philipp Weber
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/kdf1_iso18033.h>
namespace Botan {
size_t KDF1_18033::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
{
uint32_t counter = 0;
secure_vector<uint8_t> h;
size_t offset = 0;
while(offset != key_len && counter != 0xFFFFFFFF)
{
m_hash->update(secret, secret_len);
m_hash->update_be(counter++);
m_hash->update(label, label_len);
m_hash->update(salt, salt_len);
m_hash->final(h);
const size_t added = std::min(h.size(), key_len - offset);
copy_mem(&key[offset], h.data(), added);
offset += added;
}
// FIXME: returns truncated output
return offset;
}
}
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