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/*
* FORS - Forest of Random Subsets (FIPS 205, Section 8)
* (C) 2023 Jack Lloyd
* 2023 Fabian Albert, René Meusel, Amos Treiber - Rohde & Schwarz Cybersecurity
*
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_SPHINCS_PLUS_FORS_H_
#define BOTAN_SPHINCS_PLUS_FORS_H_
#include <botan/internal/sp_types.h>
namespace Botan {
class Sphincs_Address;
class Sphincs_Hash_Functions;
class Sphincs_Parameters;
/**
* @brief FIPS 205, Algorithm 16: fors_sign (with simultaneous FORS pk generation)
*
* Implements a domain specific wrapper for the few-times signature scheme
* FORS (Forest of Random Subsets). It is meant to be used inside SLH-DSA
* and does not aim to be applicable for other use cases.
*/
BOTAN_TEST_API SphincsTreeNode fors_sign_and_pkgen(StrongSpan<ForsSignature> sig_out,
const SphincsHashedMessage& hashed_message,
const SphincsSecretSeed& secret_seed,
const Sphincs_Address& address,
const Sphincs_Parameters& params,
Sphincs_Hash_Functions& hashes);
/**
* @brief FIPS 205, Algorithm 17: fors_pkFromSig
*
* Reconstructs the FORS public key from a given FORS @p signature and
* @p message. This is tailored for the use case in the SLH-DSA implementation
* and is not meant for general usability.
*/
BOTAN_TEST_API SphincsTreeNode fors_public_key_from_signature(const SphincsHashedMessage& hashed_message,
StrongSpan<const ForsSignature> signature,
const Sphincs_Address& address,
const Sphincs_Parameters& params,
Sphincs_Hash_Functions& hash);
} // namespace Botan
#endif