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/*
* XMSS Hash
* A collection of pseudorandom hash functions required for XMSS and WOTS
* computations.
* (C) 2016,2017 Matthias Gierlings
*
* Botan is released under the Simplified BSD License (see license.txt)
**/
#include <botan/xmss_hash.h>
#include <botan/exceptn.h>
namespace Botan {
XMSS_Hash::XMSS_Hash(const XMSS_Hash& hash)
: XMSS_Hash(hash.m_hash_func_name)
{
}
XMSS_Hash::XMSS_Hash(const std::string& h_func_name) :
m_hash(HashFunction::create(h_func_name)),
m_hash_func_name(h_func_name)
{
if(!m_hash)
throw Lookup_Error("XMSS cannot use hash " + h_func_name +
" because it is unavailable");
m_output_length = m_hash->output_length();
BOTAN_ASSERT(m_output_length > 0, "Hash output length of zero is invalid.");
m_zero_padding.resize(m_output_length - 1);
m_msg_hash.reset(m_hash->clone());
}
void
XMSS_Hash::h(secure_vector<uint8_t>& result,
const secure_vector<uint8_t>& key,
const secure_vector<uint8_t>& data)
{
m_hash->update(m_zero_padding);
m_hash->update(m_id_h);
m_hash->update(key);
m_hash->update(data);
m_hash->final(result);
}
void XMSS_Hash::h_msg_init(const secure_vector<uint8_t>& randomness,
const secure_vector<uint8_t>& root,
const secure_vector<uint8_t>& index_bytes)
{
m_msg_hash->clear();
m_msg_hash->update(m_zero_padding);
m_msg_hash->update(m_id_hmsg);
m_msg_hash->update(randomness);
m_msg_hash->update(root);
m_msg_hash->update(index_bytes);
}
void XMSS_Hash::h_msg_update(const uint8_t data[], size_t size)
{
m_msg_hash->update(data, size);
}
secure_vector<uint8_t> XMSS_Hash::h_msg_final()
{
return m_msg_hash->final();
}
secure_vector<uint8_t>
XMSS_Hash::h_msg(const secure_vector<uint8_t>& randomness,
const secure_vector<uint8_t>& root,
const secure_vector<uint8_t>& index_bytes,
const secure_vector<uint8_t>& data)
{
h_msg_init(randomness, root, index_bytes);
m_msg_hash->update(data);
return m_msg_hash->final();
}
}