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/**
* XMSS Hash
* A collection of pseudorandom hash functions required for XMSS and WOTS
* computations.
* (C) 2016 Matthias Gierlings
*
* Botan is released under the Simplified BSD License (see license.txt)
**/
#include <botan/xmss_hash.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_msg_hash(HashFunction::create(h_func_name)),
m_output_length(m_hash->output_length()),
m_zero_padding(m_output_length - 1, 0x00),
m_hash_func_name(h_func_name)
{
BOTAN_ASSERT(m_output_length > 0, "Hash output length of zero is invalid.");
}
void
XMSS_Hash::h(secure_vector<byte>& result,
const secure_vector<byte>& key,
const secure_vector<byte>& 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<byte>& randomness,
const secure_vector<byte>& root,
const secure_vector<byte>& 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 secure_vector<byte>& data)
{
m_msg_hash->update(data);
}
void XMSS_Hash::h_msg_update(const byte data[], size_t size)
{
m_msg_hash->update(data, size);
}
secure_vector<byte> XMSS_Hash::h_msg_final()
{
return m_msg_hash->final();
}
secure_vector<byte>
XMSS_Hash::h_msg(const secure_vector<byte>& randomness,
const secure_vector<byte>& root,
const secure_vector<byte>& index_bytes,
const secure_vector<byte>& data)
{
h_msg_init(randomness, root, index_bytes);
m_msg_hash->update(data);
return m_msg_hash->final();
}
XMSS_Hash& XMSS_Hash::operator=(XMSS_Hash hash)
{
std::swap(m_hash, hash.m_hash);
std::swap(m_msg_hash, hash.m_msg_hash);
std::swap(m_output_length, hash.m_output_length);
std::swap(m_zero_padding, hash.m_zero_padding);
return *this;
}
}
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