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/*
* XMSS WOTS Private Key
* A Winternitz One Time Signature private key for use with Extended Hash-Based
* Signatures.
*
* (C) 2016 Matthias Gierlings
*
* Botan is released under the Simplified BSD License (see license.txt)
**/
#include <botan/xmss_wots_privatekey.h>
namespace Botan {
wots_keysig_t
XMSS_WOTS_PrivateKey::generate(const secure_vector<byte>& priv_seed)
{
wots_keysig_t priv_key(m_wots_params.len(),
secure_vector<byte>(0));
for(size_t i = 0; i < m_wots_params.len(); i++)
{
XMSS_Tools::concat<size_t>(priv_key[i], i, 32);
m_hash.prf(priv_key[i], priv_seed, priv_key[i]);
}
return priv_key;
}
XMSS_WOTS_PublicKey
XMSS_WOTS_PrivateKey::generate_public_key(XMSS_Address& adrs)
{
XMSS_WOTS_PublicKey pub_key(m_wots_params.oid(),
public_seed());
generate_public_key(pub_key, wots_keysig_t((*this)[adrs]), adrs);
return pub_key;
}
void
XMSS_WOTS_PrivateKey::generate_public_key(XMSS_WOTS_PublicKey& pub_key,
wots_keysig_t&& in_key_data,
XMSS_Address& adrs)
{
BOTAN_ASSERT(wots_parameters() == pub_key.wots_parameters() &&
public_seed() == pub_key.public_seed(),
"Conflicting public key data.");
pub_key.set_key_data(std::move(in_key_data));
for(size_t i = 0; i < m_wots_params.len(); i++)
{
adrs.set_chain_address(i);
chain(pub_key[i], 0, m_wots_params.wots_parameter() - 1, adrs,
public_seed());
}
}
wots_keysig_t
XMSS_WOTS_PrivateKey::sign(
const secure_vector<byte>& msg,
XMSS_Address& adrs)
{
secure_vector<byte> msg_digest
{
m_wots_params.base_w(msg, m_wots_params.len_1())
};
m_wots_params.append_checksum(msg_digest);
wots_keysig_t sig((*this)[adrs]);
for(size_t i = 0; i < m_wots_params.len(); i++)
{
adrs.set_chain_address(i);
chain(sig[i], 0 , msg_digest[i], adrs, m_public_seed);
}
return sig;
}
}
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