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/*
* XMSS Parameters
* (C) 2016,2018 Matthias Gierlings
*
* Botan is released under the Simplified BSD License (see license.txt)
**/
#ifndef BOTAN_XMSS_PARAMETERS_H_
#define BOTAN_XMSS_PARAMETERS_H_
#include <botan/xmss_wots.h>
#include <string>
namespace Botan {
/**
* Descibes a signature method for XMSS, as defined in:
* [1] XMSS: Extended Hash-Based Signatures,
* Request for Comments: 8391
* Release: May 2018.
* https://datatracker.ietf.org/doc/rfc8391/
**/
class BOTAN_PUBLIC_API(2,0) XMSS_Parameters
{
public:
enum xmss_algorithm_t
{
XMSS_SHA2_10_256 = 0x00000001,
XMSS_SHA2_16_256 = 0x00000002,
XMSS_SHA2_20_256 = 0x00000003,
XMSS_SHA2_10_512 = 0x00000004,
XMSS_SHA2_16_512 = 0x00000005,
XMSS_SHA2_20_512 = 0x00000006,
XMSS_SHAKE_10_256 = 0x00000007,
XMSS_SHAKE_16_256 = 0x00000008,
XMSS_SHAKE_20_256 = 0x00000009,
XMSS_SHAKE_10_512 = 0x0000000a,
XMSS_SHAKE_16_512 = 0x0000000b,
XMSS_SHAKE_20_512 = 0x0000000c
};
static xmss_algorithm_t xmss_id_from_string(const std::string& algo_name);
XMSS_Parameters(const std::string& algo_name);
XMSS_Parameters(xmss_algorithm_t oid);
/**
* @return XMSS registry name for the chosen parameter set.
**/
const std::string& name() const
{
return m_name;
}
const std::string& hash_function_name() const
{
return m_hash_name;
}
/**
* Retrieves the uniform length of a message, and the size of
* each node. This correlates to XMSS parameter "n" defined
* in [1].
*
* @return element length in bytes.
**/
size_t element_size() const { return m_element_size; }
/**
* @returns The height (number of levels - 1) of the tree
**/
size_t tree_height() const { return m_tree_height; }
/**
* The Winternitz parameter.
*
* @return numeric base used for internal representation of
* data.
**/
size_t wots_parameter() const { return m_w; }
size_t len() const { return m_len; }
xmss_algorithm_t oid() const { return m_oid; }
XMSS_WOTS_Parameters::ots_algorithm_t ots_oid() const
{
return m_wots_oid;
}
/**
* Returns the estimated pre-quantum security level of
* the chosen algorithm.
**/
size_t estimated_strength() const
{
return m_strength;
}
bool operator==(const XMSS_Parameters& p) const
{
return m_oid == p.m_oid;
}
private:
xmss_algorithm_t m_oid;
XMSS_WOTS_Parameters::ots_algorithm_t m_wots_oid;
std::string m_name;
std::string m_hash_name;
size_t m_element_size;
size_t m_tree_height;
size_t m_w;
size_t m_len;
size_t m_strength;
};
}
#endif
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