Botan::LMOTS_Public_Key Class Reference

Representation of an OTS public key. More...

#include <lm_ots.h>

Inheritance diagram for Botan::LMOTS_Public_Key:

Public Member Functions
const LMS_Identifier &	identifier () const
	The LMS identifier of the LMS tree containing this OTS instance ('I' in RFC 8554)
const LMOTS_K &	K () const
	The public key final hash value (K in RFC 8554 4.3 )
	LMOTS_Public_Key (const LMOTS_Params &params, const LMS_Identifier &identifier, LMS_Tree_Node_Idx q, LMOTS_K K)
	Construct a new LMOTS public key object using the bytes.
	LMOTS_Public_Key (const LMOTS_Private_Key &lmots_sk)
	Derivivation of an LMOTS public key using an LMOTS_Private_Key as defined in RFC 8554 4.3.
const LMOTS_Params &	params () const
	The LMOTS parameters.
LMS_Tree_Node_Idx	q () const
	The index of the LMS tree leaf associated with this OTS instance.

Detailed Description

Representation of an OTS public key.

Contains the public key bytes as defined in RFC 8554 4.3:

u32str(type) || I || u32str(q) || K

Definition at line 306 of file lm_ots.h.

Constructor & Destructor Documentation

LMOTS_Public_Key() [1/2]

Botan::LMOTS_Public_Key::LMOTS_Public_Key

(

const LMOTS_Private_Key &

lmots_sk

)

Derivivation of an LMOTS public key using an LMOTS_Private_Key as defined in RFC 8554 4.3.

Definition at line 310 of file lm_ots.cpp.

                                                                    : OTS_Instance(lmots_sk) {
   const auto pk_hash = lmots_sk.params().hash();
   pk_hash->update(lmots_sk.identifier());
   pk_hash->update(store_be(lmots_sk.q()));
   pk_hash->update(store_be(D_PBLC));
 
   Chain_Generator chain_gen(lmots_sk.identifier(), lmots_sk.q());
   const auto hash = lmots_sk.params().hash();
   LMOTS_Node tmp(lmots_sk.params().n());
   for(uint16_t i = 0; i < lmots_sk.params().p(); ++i) {
      chain_gen.process(*hash, i, 0, lmots_sk.params().coef_max(), lmots_sk.chain_input(i), tmp);
      pk_hash->update(tmp);
   }
 
   m_K = pk_hash->final<LMOTS_K>();
}

References Botan::LMOTS_Private_Key::chain_input(), Botan::LMOTS_Params::coef_max(), Botan::LMOTS_Params::hash(), Botan::OTS_Instance::identifier(), Botan::LMOTS_Params::n(), Botan::OTS_Instance::params(), Botan::OTS_Instance::q(), Botan::store_be(), and Botan::Buffered_Computation::update().

LMOTS_Public_Key() [2/2]

Botan::LMOTS_Public_Key::LMOTS_Public_Key ( const LMOTS_Params & params, const LMS_Identifier & identifier, LMS_Tree_Node_Idx q, LMOTS_K K )

inline

Construct a new LMOTS public key object using the bytes.

Note that the passed params, identifier and q value should match with the prefix in pub_key_bytes.

Definition at line 320 of file lm_ots.h.

                                                                                                                     :
            OTS_Instance(params, identifier, q), m_K(std::move(K)) {}

Member Function Documentation

identifier()

const LMS_Identifier & Botan::OTS_Instance::identifier ( ) const

inlineinherited

The LMS identifier of the LMS tree containing this OTS instance ('I' in RFC 8554)

Definition at line 238 of file lm_ots.h.

{ return m_identifier; }

Referenced by Botan::LMOTS_Private_Key::LMOTS_Private_Key(), LMOTS_Public_Key(), and Botan::LMOTS_Private_Key::sign().

K()

const LMOTS_K & Botan::LMOTS_Public_Key::K ( ) const

inline

The public key final hash value (K in RFC 8554 4.3 )

Returns

const LMOTS_K&

Definition at line 328 of file lm_ots.h.

{ return m_K; }

params()

const LMOTS_Params & Botan::OTS_Instance::params ( ) const

inlineinherited

The LMOTS parameters.

Definition at line 233 of file lm_ots.h.

{ return m_params; }

Referenced by Botan::LMOTS_Private_Key::LMOTS_Private_Key(), LMOTS_Public_Key(), and Botan::LMOTS_Private_Key::sign().

q()

LMS_Tree_Node_Idx Botan::OTS_Instance::q ( ) const

inlineinherited

The index of the LMS tree leaf associated with this OTS instance.

Definition at line 243 of file lm_ots.h.

{ return m_q; }

Referenced by Botan::LMOTS_Private_Key::LMOTS_Private_Key(), LMOTS_Public_Key(), and Botan::LMOTS_Private_Key::sign().

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

• src/lib/pubkey/hss_lms/lm_ots.h
• src/lib/pubkey/hss_lms/lm_ots.cpp