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/*
* XMSS Common Ops
* (C) 2016 Matthias Gierlings
*
* Botan is released under the Simplified BSD License (see license.txt)
**/
#ifndef BOTAN_XMSS_COMMON_OPS_H_
#define BOTAN_XMSS_COMMON_OPS_H_
#include <vector>
#include <botan/secmem.h>
#include <botan/xmss_parameters.h>
#include <botan/xmss_address.h>
#include <botan/xmss_hash.h>
namespace Botan {
typedef std::vector<secure_vector<uint8_t>> wots_keysig_t;
/**
* Operations shared by XMSS signature generation and verification operations.
**/
class XMSS_Common_Ops
{
public:
XMSS_Common_Ops(XMSS_Parameters::xmss_algorithm_t oid)
: m_xmss_params(oid), m_hash(m_xmss_params.hash_function_name()) {}
protected:
/**
* Algorithm 7: "RAND_HASH"
*
* Generates a randomized hash.
*
* @param[out] result The resulting randomized hash.
* @param[in] left Left half of the hash function input.
* @param[in] right Right half of the hash function input.
* @param[in] adrs Adress of the hash function call.
* @param[in] seed The seed for G.
**/
void randomize_tree_hash(
secure_vector<uint8_t>& result,
const secure_vector<uint8_t>& left,
const secure_vector<uint8_t>& right,
XMSS_Address& adrs,
const secure_vector<uint8_t>& seed);
/**
* Algorithm 8: "ltree"
* Create an L-tree used to compute the leaves of the binary hash tree.
* Takes a WOTS+ public key and compresses it to a single n-byte value.
*
* @param[out] result Public key compressed to a single n-byte value
* pk[0].
* @param[in] pk Winternitz One Time Signatures+ public key.
* @param[in] adrs Address encoding the address of the L-Tree
* @param[in] seed The seed generated during the public key generation.
**/
void create_l_tree(
secure_vector<uint8_t>& result,
wots_keysig_t pk,
XMSS_Address& adrs,
const secure_vector<uint8_t>& seed);
protected:
XMSS_Parameters m_xmss_params;
XMSS_Hash m_hash;
};
}
#endif
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