Botan::ECDH_PublicKey Class Reference

#include <ecdh.h>

Inheritance diagram for Botan::ECDH_PublicKey:

Public Member Functions
std::string	algo_name () const
AlgorithmIdentifier	algorithm_identifier () const
bool	check_key (RandomNumberGenerator &rng, bool strong) const
MemoryVector< byte >	DER_domain () const
const EC_Group &	domain () const
EC_Group_Encoding	domain_format () const
	ECDH_PublicKey (const AlgorithmIdentifier &alg_id, const MemoryRegion< byte > &key_bits)
	ECDH_PublicKey (const EC_Group &dom_par, const PointGFp &public_point)
virtual OID	get_oid () const
size_t	max_input_bits () const
virtual size_t	message_part_size () const
virtual size_t	message_parts () const
const PointGFp &	public_point () const
MemoryVector< byte >	public_value () const
void	set_parameter_encoding (EC_Group_Encoding enc)
MemoryVector< byte >	x509_subject_public_key () const

Protected Member Functions
	ECDH_PublicKey ()
virtual void	load_check (RandomNumberGenerator &rng) const

Protected Attributes
EC_Group_Encoding	domain_encoding
EC_Group	domain_params
PointGFp	public_key

Detailed Description

This class represents ECDH Public Keys.

Definition at line 21 of file ecdh.h.

Constructor & Destructor Documentation

ECDH_PublicKey() [1/3]

Botan::ECDH_PublicKey::ECDH_PublicKey ( const AlgorithmIdentifier & alg_id, const MemoryRegion< byte > & key_bits )

inline

Definition at line 25 of file ecdh.h.

                                                         :
         EC_PublicKey(alg_id, key_bits) {}

References Botan::EC_PublicKey::EC_PublicKey().

ECDH_PublicKey() [2/3]

Botan::ECDH_PublicKey::ECDH_PublicKey ( const EC_Group & dom_par, const PointGFp & public_point )

inline

Construct a public key from a given public point.

Parameters

dom_par	the domain parameters associated with this key
public_point	the public point defining this key

Definition at line 34 of file ecdh.h.

                                                   :
         EC_PublicKey(dom_par, public_point) {}

References Botan::EC_PublicKey::EC_PublicKey(), and Botan::EC_PublicKey::public_point().

ECDH_PublicKey() [3/3]

Botan::ECDH_PublicKey::ECDH_PublicKey ( )

inlineprotected

Definition at line 59 of file ecdh.h.

{}

Referenced by Botan::make_public_key().

Member Function Documentation

algo_name()

std::string Botan::ECDH_PublicKey::algo_name ( ) const

inlinevirtual

Get this keys algorithm name.

Returns

this keys algorithm name

Implements Botan::Public_Key.

Definition at line 42 of file ecdh.h.

{ return "ECDH"; }

algorithm_identifier()

AlgorithmIdentifier Botan::EC_PublicKey::algorithm_identifier ( ) const

virtualinherited

Returns

X.509 AlgorithmIdentifier for this key

Implements Botan::Public_Key.

Definition at line 45 of file ecc_key.cpp.

   {
   return AlgorithmIdentifier(get_oid(), DER_domain());
   }

References Botan::AlgorithmIdentifier::AlgorithmIdentifier(), DER_domain(), and Botan::Public_Key::get_oid().

check_key()

bool Botan::EC_PublicKey::check_key ( RandomNumberGenerator & rng, bool strong ) const

virtualinherited

Test the key values for consistency.

Parameters

rng	rng to use
strong	whether to perform strong and lengthy version of the test

Returns

true if the test is passed

Implements Botan::Public_Key.

Reimplemented in Botan::ECDSA_PrivateKey.

Definition at line 39 of file ecc_key.cpp.

   {
   return public_point().on_the_curve();
   }

References Botan::PointGFp::on_the_curve(), and public_point().

DER_domain()

MemoryVector< byte > Botan::EC_PublicKey::DER_domain ( ) const

inlineinherited

Return the DER encoding of this keys domain in whatever format is preset for this particular key

Definition at line 72 of file ecc_key.h.

         { return domain().DER_encode(domain_format()); }

References domain(), and domain_format().

Referenced by algorithm_identifier().

domain()

const EC_Group & Botan::EC_PublicKey::domain ( ) const

inlineinherited

Get the domain parameters of this key.

Exceptions

Invalid_State

is thrown if the domain parameters of this point are not set

Returns

the domain parameters of this key

Definition at line 60 of file ecc_key.h.

{ return domain_params; }

References domain_params.

Referenced by DER_domain(), Botan::EC_PrivateKey::EC_PrivateKey(), Botan::EC_PrivateKey::EC_PrivateKey(), EC_PublicKey(), EC_PublicKey(), Botan::ECDH_KA_Operation::ECDH_KA_Operation(), Botan::ECDH_PrivateKey::ECDH_PrivateKey(), Botan::ECDSA_PrivateKey::ECDSA_PrivateKey(), Botan::ECDH_PublicKey::max_input_bits(), Botan::ECDSA_PublicKey::max_input_bits(), and Botan::ECDSA_PublicKey::message_part_size().

domain_format()

EC_Group_Encoding Botan::EC_PublicKey::domain_format ( ) const

inlineinherited

Get the domain parameter encoding to be used when encoding this key.

Returns

the encoding to use

Definition at line 79 of file ecc_key.h.

         { return domain_encoding; }

References domain_encoding.

Referenced by DER_domain().

get_oid()

OID Botan::Public_Key::get_oid ( ) const

virtualinherited

Get the OID of the underlying public key scheme.

Returns

OID of the public key scheme

Definition at line 17 of file pk_keys.cpp.

   {
   try {
      return OIDS::lookup(algo_name());
      }
   catch(Lookup_Error)
      {
      throw Lookup_Error("PK algo " + algo_name() + " has no defined OIDs");
      }
   }

References algo_name(), Botan::OIDS::lookup(), and Botan::Lookup_Error::Lookup_Error().

Referenced by algo_name(), Botan::DL_Scheme_PublicKey::algorithm_identifier(), Botan::EC_PublicKey::algorithm_identifier(), and Botan::IF_Scheme_PublicKey::algorithm_identifier().

load_check()

void Botan::Public_Key::load_check ( RandomNumberGenerator & rng ) const

protectedvirtualinherited

Self-test after loading a key

Parameters

rng	a random number generator

Reimplemented in Botan::Private_Key.

Definition at line 31 of file pk_keys.cpp.

   {
   if(!check_key(rng, BOTAN_PUBLIC_KEY_STRONG_CHECKS_ON_LOAD))
      throw Invalid_Argument(algo_name() + ": Invalid public key");
   }

References algo_name(), and check_key().

max_input_bits()

size_t Botan::ECDH_PublicKey::max_input_bits ( ) const

inlinevirtual

Get the maximum number of bits allowed to be fed to this key. This is the bitlength of the order of the base point.

Returns

maximum number of input bits

Implements Botan::Public_Key.

Definition at line 50 of file ecdh.h.

{ return domain().get_order().bits(); }

References Botan::EC_PublicKey::domain().

message_part_size()

virtual size_t Botan::Public_Key::message_part_size ( ) const

inlinevirtualinherited

Find out the message part size supported by this scheme/key.

Returns

size of the message parts in bits

Reimplemented in Botan::DSA_PublicKey, Botan::ECDSA_PublicKey, and Botan::NR_PublicKey.

Definition at line 56 of file pk_keys.h.

{ return 0; }

message_parts()

virtual size_t Botan::Public_Key::message_parts ( ) const

inlinevirtualinherited

Find out the number of message parts supported by this scheme.

Returns

number of message parts

Reimplemented in Botan::DSA_PublicKey, Botan::ECDSA_PublicKey, and Botan::NR_PublicKey.

Definition at line 50 of file pk_keys.h.

{ return 1; }

Referenced by Botan::X509_Object::check_signature(), and Botan::choose_sig_format().

public_point()

const PointGFp & Botan::EC_PublicKey::public_point ( ) const

inlineinherited

Get the public point of this key.

Exceptions

Invalid_State

is thrown if the domain parameters of this point are not set

Returns

the public point of this key

Definition at line 45 of file ecc_key.h.

{ return public_key; }

References public_key.

Referenced by check_key(), Botan::ECDSA_PrivateKey::check_key(), EC_PublicKey(), Botan::ECDH_PublicKey::ECDH_PublicKey(), Botan::ECDSA_PublicKey::ECDSA_PublicKey(), Botan::ECDH_PublicKey::public_value(), and x509_subject_public_key().

public_value()

MemoryVector< byte > Botan::ECDH_PublicKey::public_value ( ) const

inline

Returns

public point value

Definition at line 55 of file ecdh.h.

         { return EC2OSP(public_point(), PointGFp::UNCOMPRESSED); }

References Botan::EC2OSP(), Botan::EC_PublicKey::public_point(), and Botan::PointGFp::UNCOMPRESSED.

Referenced by Botan::ECDH_PrivateKey::public_value().

set_parameter_encoding()

void Botan::EC_PublicKey::set_parameter_encoding ( EC_Group_Encoding enc )

inherited

Set the domain parameter encoding to be used when encoding this key.

Parameters

enc	the encoding to use

Definition at line 55 of file ecc_key.cpp.

   {
   if(form != EC_DOMPAR_ENC_EXPLICIT &&
      form != EC_DOMPAR_ENC_IMPLICITCA &&
      form != EC_DOMPAR_ENC_OID)
      throw Invalid_Argument("Invalid encoding form for EC-key object specified");
 
   if((form == EC_DOMPAR_ENC_OID) && (domain_params.get_oid() == ""))
      throw Invalid_Argument("Invalid encoding form OID specified for "
                             "EC-key object whose corresponding domain "
                             "parameters are without oid");
 
   domain_encoding = form;
   }

References domain_encoding, domain_params, Botan::EC_DOMPAR_ENC_EXPLICIT, Botan::EC_DOMPAR_ENC_IMPLICITCA, Botan::EC_DOMPAR_ENC_OID, and Botan::EC_Group::get_oid().

Referenced by Botan::DE_EAC::create_cvc_req(), Botan::DE_EAC::link_cvca(), and Botan::DE_EAC::sign_request().

x509_subject_public_key()

MemoryVector< byte > Botan::EC_PublicKey::x509_subject_public_key ( ) const

virtualinherited

Returns

X.509 subject key encoding for this key object

Implements Botan::Public_Key.

Definition at line 50 of file ecc_key.cpp.

   {
   return EC2OSP(public_point(), PointGFp::COMPRESSED);
   }

References Botan::PointGFp::COMPRESSED, Botan::EC2OSP(), and public_point().

Member Data Documentation

domain_encoding

EC_Group_Encoding Botan::EC_PublicKey::domain_encoding

protectedinherited

Definition at line 86 of file ecc_key.h.

Referenced by domain_format(), Botan::EC_PrivateKey::EC_PrivateKey(), Botan::EC_PrivateKey::EC_PrivateKey(), EC_PublicKey(), EC_PublicKey(), EC_PublicKey(), and set_parameter_encoding().

domain_params

EC_Group Botan::EC_PublicKey::domain_params

protectedinherited

Definition at line 84 of file ecc_key.h.

Referenced by domain(), Botan::EC_PrivateKey::EC_PrivateKey(), Botan::EC_PrivateKey::EC_PrivateKey(), EC_PublicKey(), EC_PublicKey(), and set_parameter_encoding().

public_key

PointGFp Botan::EC_PublicKey::public_key

protectedinherited

Definition at line 85 of file ecc_key.h.

Referenced by Botan::EC_PrivateKey::EC_PrivateKey(), Botan::EC_PrivateKey::EC_PrivateKey(), EC_PublicKey(), EC_PublicKey(), and public_point().

---

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

• src/pubkey/ecdh/ecdh.h