Botan::Sphincs_Parameters Class Reference

#include <sp_parameters.h>

Public Member Functions
uint32_t	a () const
AlgorithmIdentifier	algorithm_identifier () const
uint32_t	bitsec () const
uint32_t	d () const
uint32_t	fors_message_bytes () const
uint32_t	fors_signature_bytes () const
uint32_t	h () const
uint32_t	h_msg_digest_bytes () const
std::string	hash_name () const
Sphincs_Hash_Type	hash_type () const
uint32_t	ht_signature_bytes () const
bool	is_available () const
bool	is_slh_dsa () const
uint32_t	k () const
uint32_t	leaf_digest_bytes () const
uint32_t	log_w () const
size_t	n () const
OID	object_identifier () const
Sphincs_Parameter_Set	parameter_set () const
uint32_t	private_key_bytes () const
uint32_t	public_key_bytes () const
uint32_t	sphincs_signature_bytes () const
std::string	to_string () const
uint32_t	tree_digest_bytes () const
uint32_t	w () const
uint32_t	wots_bytes () const
uint32_t	wots_checksum_bytes () const
uint32_t	wots_len () const
uint32_t	wots_len_1 () const
uint32_t	wots_len_2 () const
uint32_t	xmss_signature_bytes () const
uint32_t	xmss_tree_height () const

Static Public Member Functions
static Sphincs_Parameters	create (const OID &oid)
static Sphincs_Parameters	create (Sphincs_Parameter_Set set, Sphincs_Hash_Type hash)
static Sphincs_Parameters	create (std::string_view name)

Detailed Description

Container for all SLH-DSA parameters defined by a specific instance (see FIPS 205, Table 2). Also contains getters for various parameters that are derived from the given parameters.

Definition at line 45 of file sp_parameters.h.

Member Function Documentation

a()

uint32_t Botan::Sphincs_Parameters::a ( ) const

inline

This is the desired height of the FORS trees, aka log(t) with t being the number of leaves in each FORS tree.

Returns

Height of the FORS trees

Definition at line 114 of file sp_parameters.h.

{ return m_a; }

Referenced by Botan::fors_public_key_from_signature(), and Botan::fors_sign_and_pkgen().

algorithm_identifier()

AlgorithmIdentifier Botan::Sphincs_Parameters::algorithm_identifier

(

)

const

Returns

the algorithm specifier for the selected parameter set

Definition at line 410 of file sp_parameters.cpp.

                                                                   {
   return AlgorithmIdentifier(object_identifier(), AlgorithmIdentifier::USE_EMPTY_PARAM);
}

bitsec()

uint32_t Botan::Sphincs_Parameters::bitsec ( ) const

inline

Returns

the bit security given by Table 3 (NIST R3.1 submission, page 39) for the selected parameter set

Definition at line 130 of file sp_parameters.h.

{ return m_bitsec; }

create() [1/3]

Sphincs_Parameters Botan::Sphincs_Parameters::create ( const OID & oid )

static

Definition at line 402 of file sp_parameters.cpp.

                                                            {
   return Sphincs_Parameters::create(oid.to_formatted_string());
}

References Botan::OID::to_formatted_string().

create() [2/3]

Sphincs_Parameters Botan::Sphincs_Parameters::create ( Sphincs_Parameter_Set set, Sphincs_Hash_Type hash )

static

Definition at line 349 of file sp_parameters.cpp.

                                                        {
   // See FIPS 205, Table 2
   switch(set) {
      case Sphincs_Parameter_Set::Sphincs128Small:
      case Sphincs_Parameter_Set::SLHDSA128Small:
         return Sphincs_Parameters(set, hash, 16, 63, 7, 12, 14, 16, 133);
      case Sphincs_Parameter_Set::Sphincs128Fast:
      case Sphincs_Parameter_Set::SLHDSA128Fast:
         return Sphincs_Parameters(set, hash, 16, 66, 22, 6, 33, 16, 128);
 
      case Sphincs_Parameter_Set::Sphincs192Small:
      case Sphincs_Parameter_Set::SLHDSA192Small:
         return Sphincs_Parameters(set, hash, 24, 63, 7, 14, 17, 16, 193);
      case Sphincs_Parameter_Set::Sphincs192Fast:
      case Sphincs_Parameter_Set::SLHDSA192Fast:
         return Sphincs_Parameters(set, hash, 24, 66, 22, 8, 33, 16, 194);
 
      case Sphincs_Parameter_Set::Sphincs256Small:
      case Sphincs_Parameter_Set::SLHDSA256Small:
         return Sphincs_Parameters(set, hash, 32, 64, 8, 14, 22, 16, 255);
      case Sphincs_Parameter_Set::Sphincs256Fast:
      case Sphincs_Parameter_Set::SLHDSA256Fast:
         return Sphincs_Parameters(set, hash, 32, 68, 17, 9, 35, 16, 255);
   }
   BOTAN_ASSERT_UNREACHABLE();
}

References BOTAN_ASSERT_UNREACHABLE.

Referenced by Botan::create_private_key().

create() [3/3]

Sphincs_Parameters Botan::Sphincs_Parameters::create ( std::string_view name )

static

Definition at line 377 of file sp_parameters.cpp.

                                                                 {
   auto [param_set, hash_type] = set_and_hash_from_name(name);
   return Sphincs_Parameters::create(param_set, hash_type);
}

References name.

d()

uint32_t Botan::Sphincs_Parameters::d ( ) const

inline

Returns

Number of XMSS layers in the SLH-DSA hypertree

Definition at line 106 of file sp_parameters.h.

{ return m_d; }

Referenced by Botan::ht_sign(), Botan::ht_verify(), and Botan::xmss_gen_root().

fors_message_bytes()

uint32_t Botan::Sphincs_Parameters::fors_message_bytes ( ) const

inline

Returns

the byte length of the FORS input message

Definition at line 185 of file sp_parameters.h.

{ return m_fors_message_bytes; }

fors_signature_bytes()

uint32_t Botan::Sphincs_Parameters::fors_signature_bytes ( ) const

inline

Returns

the byte length of a FORS signature

Definition at line 180 of file sp_parameters.h.

{ return m_fors_sig_bytes; }

Referenced by Botan::fors_sign_and_pkgen().

h()

uint32_t Botan::Sphincs_Parameters::h ( ) const

inline

Returns

Height of the SLH-DSA hypertree

Definition at line 101 of file sp_parameters.h.

{ return m_h; }

h_msg_digest_bytes()

uint32_t Botan::Sphincs_Parameters::h_msg_digest_bytes ( ) const

inline

Returns

the byte length of the output of H_msg. Corresponds to 'm' of FIPS 205, Table 2.

Definition at line 216 of file sp_parameters.h.

{ return m_h_msg_digest_bytes; }

hash_name()

std::string Botan::Sphincs_Parameters::hash_name

(

)

const

Returns

the algorithm specifier of the hash function to be used

Definition at line 386 of file sp_parameters.cpp.

                                              {
   switch(m_hash_type) {
      case Sphincs_Hash_Type::Sha256:
         return "SHA-256";
      case Sphincs_Hash_Type::Shake256:
         return fmt("SHAKE-256({})", 8 * n());
      case Sphincs_Hash_Type::Haraka:
         return "Haraka";
   }
   BOTAN_ASSERT_UNREACHABLE();
}

References BOTAN_ASSERT_UNREACHABLE, and Botan::fmt().

hash_type()

Sphincs_Hash_Type Botan::Sphincs_Parameters::hash_type ( ) const

inline

Returns

the hash type used by those parameters

Definition at line 71 of file sp_parameters.h.

{ return m_hash_type; }

Referenced by Botan::Sphincs_Hash_Functions::create().

ht_signature_bytes()

uint32_t Botan::Sphincs_Parameters::ht_signature_bytes ( ) const

inline

Returns

the byte length of a the xmss hypertree signature

Definition at line 145 of file sp_parameters.h.

{ return m_ht_sig_bytes; }

Referenced by Botan::ht_sign(), and Botan::ht_verify().

is_available()

bool Botan::Sphincs_Parameters::is_available

(

)

const

Returns

true iff the given parameter set and hash combination is available in this build. Note that parameter sets can only be used if this function evaluates to true.

Definition at line 324 of file sp_parameters.cpp.

                                            {
   [[maybe_unused]] const bool is_slh_dsa = is_slh_dsa_set(m_set);
#ifdef BOTAN_HAS_SLH_DSA_WITH_SHA2
   if(is_slh_dsa && m_hash_type == Sphincs_Hash_Type::Sha256) {
      return true;
   }
#endif
#ifdef BOTAN_HAS_SLH_DSA_WITH_SHAKE
   if(is_slh_dsa && m_hash_type == Sphincs_Hash_Type::Shake256) {
      return true;
   }
#endif
#ifdef BOTAN_HAS_SPHINCS_PLUS_WITH_SHA2
   if(!is_slh_dsa && m_hash_type == Sphincs_Hash_Type::Sha256) {
      return true;
   }
#endif
#ifdef BOTAN_HAS_SPHINCS_PLUS_WITH_SHAKE
   if(!is_slh_dsa && m_hash_type == Sphincs_Hash_Type::Shake256) {
      return true;
   }
#endif
   return false;
}

Referenced by Botan::SphincsPlus_PrivateKey::SphincsPlus_PrivateKey(), Botan::SphincsPlus_PrivateKey::SphincsPlus_PrivateKey(), and Botan::SphincsPlus_PublicKey::SphincsPlus_PublicKey().

is_slh_dsa()

bool Botan::Sphincs_Parameters::is_slh_dsa

(

)

const

Returns

true for SLH-DSA parameter sets. False for SPHINCS+ Round 3.1 parameter sets.

Definition at line 382 of file sp_parameters.cpp.

                                          {
   return is_slh_dsa_set(m_set);
}

k()

uint32_t Botan::Sphincs_Parameters::k ( ) const

inline

Returns

Number of FORS trees to use

Definition at line 119 of file sp_parameters.h.

{ return m_k; }

Referenced by Botan::fors_public_key_from_signature(), and Botan::fors_sign_and_pkgen().

leaf_digest_bytes()

uint32_t Botan::Sphincs_Parameters::leaf_digest_bytes ( ) const

inline

Returns

the byte length of the leaf index output of H_msg

Definition at line 210 of file sp_parameters.h.

{ return m_leaf_digest_bytes; }

log_w()

uint32_t Botan::Sphincs_Parameters::log_w ( ) const

inline

Returns

the base 2 logarithm of the Winternitz parameter for WOTS+ signatures

Definition at line 150 of file sp_parameters.h.

{ return m_lg_w; }

n()

size_t Botan::Sphincs_Parameters::n ( ) const

inline

Returns

SLH-DSA security parameter in bytes

Definition at line 96 of file sp_parameters.h.

{ return m_n; }

Referenced by Botan::compute_root(), Botan::fors_public_key_from_signature(), Botan::fors_sign_and_pkgen(), Botan::ht_verify(), Botan::Sphincs_Hash_Functions_Sha2::Sphincs_Hash_Functions_Sha2(), Botan::SphincsPlus_PrivateKey::SphincsPlus_PrivateKey(), Botan::treehash(), Botan::wots_public_key_from_signature(), Botan::wots_sign_and_pkgen(), Botan::xmss_gen_root(), and Botan::xmss_sign_and_pkgen().

object_identifier()

OID Botan::Sphincs_Parameters::object_identifier

(

)

const

Returns

the OID of the algorithm specified by those parameters

Definition at line 406 of file sp_parameters.cpp.

                                                {
   return OID::from_string(to_string());
}

parameter_set()

Sphincs_Parameter_Set Botan::Sphincs_Parameters::parameter_set ( ) const

inline

Returns

the generic algorithm parameterization set to be used by those parameters

Definition at line 76 of file sp_parameters.h.

{ return m_set; }

private_key_bytes()

uint32_t Botan::Sphincs_Parameters::private_key_bytes ( ) const

inline

Returns

the byte length of an encoded private key for this parameter set

Definition at line 200 of file sp_parameters.h.

{ return m_n * 2 + public_key_bytes(); }

Referenced by Botan::SphincsPlus_PrivateKey::SphincsPlus_PrivateKey().

public_key_bytes()

uint32_t Botan::Sphincs_Parameters::public_key_bytes ( ) const

inline

Returns

the byte length of an encoded public key for this parameter set

Definition at line 195 of file sp_parameters.h.

{ return m_n * 2; }

Referenced by Botan::SphincsPlus_PrivateKey::SphincsPlus_PrivateKey().

sphincs_signature_bytes()

uint32_t Botan::Sphincs_Parameters::sphincs_signature_bytes ( ) const

inline

Returns

the byte length of a SLH-DSA signature

Definition at line 190 of file sp_parameters.h.

{ return m_sp_sig_bytes; }

to_string()

std::string Botan::Sphincs_Parameters::to_string

(

)

const

Returns

a string representation of this parameter set

Definition at line 398 of file sp_parameters.cpp.

                                              {
   return name_from_set_and_hash(parameter_set(), hash_type());
}

tree_digest_bytes()

uint32_t Botan::Sphincs_Parameters::tree_digest_bytes ( ) const

inline

Returns

the byte length of the tree index output of H_msg

Definition at line 205 of file sp_parameters.h.

{ return m_tree_digest_bytes; }

w()

uint32_t Botan::Sphincs_Parameters::w ( ) const

inline

Returns

the Winternitz parameter for WOTS+ signatures

Definition at line 124 of file sp_parameters.h.

{ return m_w; }

Referenced by Botan::wots_public_key_from_signature(), and Botan::wots_sign_and_pkgen().

wots_bytes()

uint32_t Botan::Sphincs_Parameters::wots_bytes ( ) const

inline

Returns

the byte length of a WOTS+ signature

Definition at line 170 of file sp_parameters.h.

{ return m_wots_bytes; }

Referenced by Botan::ht_verify(), Botan::wots_sign_and_pkgen(), Botan::xmss_gen_root(), and Botan::xmss_sign_and_pkgen().

wots_checksum_bytes()

uint32_t Botan::Sphincs_Parameters::wots_checksum_bytes ( ) const

inline

Returns

the number of bytes a WOTS+ signature consists of

Definition at line 175 of file sp_parameters.h.

{ return m_wots_checksum_bytes; }

wots_len()

uint32_t Botan::Sphincs_Parameters::wots_len ( ) const

inline

Returns

the len parameter for WOTS+ signatures

Definition at line 165 of file sp_parameters.h.

{ return m_wots_len; }

Referenced by Botan::wots_public_key_from_signature(), and Botan::wots_sign_and_pkgen().

wots_len_1()

uint32_t Botan::Sphincs_Parameters::wots_len_1 ( ) const

inline

Returns

the len1 parameter for WOTS+ signatures

Definition at line 155 of file sp_parameters.h.

{ return m_wots_len1; }

Referenced by Botan::chain_lengths().

wots_len_2()

uint32_t Botan::Sphincs_Parameters::wots_len_2 ( ) const

inline

Returns

the len2 parameter for WOTS+ signatures

Definition at line 160 of file sp_parameters.h.

{ return m_wots_len2; }

Referenced by Botan::chain_lengths().

xmss_signature_bytes()

uint32_t Botan::Sphincs_Parameters::xmss_signature_bytes ( ) const

inline

Returns

the byte length of a single xmss signature

Definition at line 140 of file sp_parameters.h.

{ return m_xmss_sig_bytes; }

Referenced by Botan::ht_sign().

xmss_tree_height()

uint32_t Botan::Sphincs_Parameters::xmss_tree_height ( ) const

inline

Returns

the tree height of an XMSS tree

Definition at line 135 of file sp_parameters.h.

{ return m_xmss_tree_height; }

Referenced by Botan::ht_sign(), Botan::ht_verify(), Botan::xmss_gen_root(), and Botan::xmss_sign_and_pkgen().

---

The documentation for this class was generated from the following files:

• src/lib/pubkey/sphincsplus/sphincsplus_common/sp_parameters.h
• src/lib/pubkey/sphincsplus/sphincsplus_common/sp_parameters.cpp