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/**
* XMSS WOTS Common Operations
* (C) 2016,2017 Matthias Gierlings
*
* Botan is released under the Simplified BSD License (see license.txt)
**/
#ifndef BOTAN_XMSS_WOTS_COMMON_OPS_H_
#define BOTAN_XMSS_WOTS_COMMON_OPS_H_
#include <cstddef>
#include <botan/types.h>
#include <botan/xmss_wots_parameters.h>
#include <botan/xmss_address.h>
#include <botan/xmss_hash.h>
namespace Botan {
/**
* Operations shared by XMSS WOTS signature generation and verification
* operations.
**/
class XMSS_WOTS_Common_Ops
{
public:
XMSS_WOTS_Common_Ops(XMSS_WOTS_Parameters::ots_algorithm_t oid)
: m_wots_params(oid), m_hash(m_wots_params.hash_function_name()) {}
protected:
/**
* Algorithm 2: Chaining Function.
*
* @param[out] result Contains the n-byte input string "x" upon call to chain(),
* that will be replaced with the value obtained by iterating
* the cryptographic hash function "F" steps times on the
* input x using the outputs of the PRNG "G".
* @param[in] start_idx The start index.
* @param[in] steps A number of steps.
* @param[in] adrs An OTS Hash Address.
* @param[in] seed A Seed.
**/
inline void chain(secure_vector<uint8_t>& result,
size_t start_idx,
size_t steps,
XMSS_Address& adrs,
const secure_vector<uint8_t>& seed)
{
chain(result, start_idx, steps, adrs, seed, m_hash);
}
/**
* Algorithm 2: Chaining Function.
*
* This overload is used in multithreaded scenarios, where it is
* required to provide seperate instances of XMSS_Hash to each
* thread.
*
* @param[out] result Contains the n-byte input string "x" upon call to chain(),
* that will be replaced with the value obtained by iterating
* the cryptographic hash function "F" steps times on the
* input x using the outputs of the PRNG "G".
* @param[in] start_idx The start index.
* @param[in] steps A number of steps.
* @param[in] adrs An OTS Hash Address.
* @param[in] seed A Seed.
* @param[in] hash Instance of XMSS_Hash, that may only by the thead
* executing chain.
**/
void chain(secure_vector<uint8_t>& result,
size_t start_idx,
size_t steps,
XMSS_Address& adrs,
const secure_vector<uint8_t>& seed,
XMSS_Hash& hash);
XMSS_WOTS_Parameters m_wots_params;
XMSS_Hash m_hash;
};
}
#endif
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