Botan  1.10.9
Public Member Functions | Protected Member Functions | Protected Attributes | List of all members
Botan::GOST_3410_PublicKey Class Reference

#include <gost_3410.h>

Inheritance diagram for Botan::GOST_3410_PublicKey:
Botan::EC_PublicKey Botan::Public_Key Botan::GOST_3410_PrivateKey

Public Member Functions

std::string algo_name () const
 
AlgorithmIdentifier algorithm_identifier () const
 
bool check_key (RandomNumberGenerator &rng, bool strong) const
 
MemoryVector< byteDER_domain () const
 
const EC_Groupdomain () const
 
EC_Group_Encoding domain_format () const
 
virtual OID get_oid () const
 
 GOST_3410_PublicKey (const EC_Group &dom_par, const PointGFp &public_point)
 
 GOST_3410_PublicKey (const AlgorithmIdentifier &alg_id, const MemoryRegion< byte > &key_bits)
 
size_t max_input_bits () const
 
size_t message_part_size () const
 
size_t message_parts () const
 
const PointGFppublic_point () const
 
void set_parameter_encoding (EC_Group_Encoding enc)
 
MemoryVector< bytex509_subject_public_key () const
 

Protected Member Functions

 GOST_3410_PublicKey ()
 
virtual void load_check (RandomNumberGenerator &rng) const
 

Protected Attributes

EC_Group_Encoding domain_encoding
 
EC_Group domain_params
 
PointGFp public_key
 

Detailed Description

GOST-34.10 Public Key

Definition at line 21 of file gost_3410.h.

Constructor & Destructor Documentation

Botan::GOST_3410_PublicKey::GOST_3410_PublicKey ( const EC_Group dom_par,
const PointGFp public_point 
)
inline

Construct a public key from a given public point.

Parameters
dom_parthe domain parameters associated with this key
public_pointthe public point defining this key

Definition at line 30 of file gost_3410.h.

31  :
32  EC_PublicKey(dom_par, public_point) {}
const PointGFp & public_point() const
Definition: ecc_key.h:45
Botan::GOST_3410_PublicKey::GOST_3410_PublicKey ( const AlgorithmIdentifier alg_id,
const MemoryRegion< byte > &  key_bits 
)

Construct from X.509 algorithm id and subject public key bits

Definition at line 51 of file gost_3410.cpp.

References BOTAN_ASSERT, Botan::BER_Decoder::decode(), Botan::EC_PublicKey::domain(), Botan::EC_PublicKey::domain_params, Botan::OCTET_STRING, Botan::PointGFp::on_the_curve(), Botan::AlgorithmIdentifier::parameters, Botan::EC_PublicKey::public_key, Botan::SEQUENCE, Botan::MemoryRegion< T >::size(), Botan::BER_Decoder::start_cons(), and std::swap().

53  {
54  OID ecc_param_id;
55 
56  // Also includes hash and cipher OIDs... brilliant design guys
57  BER_Decoder(alg_id.parameters).start_cons(SEQUENCE).decode(ecc_param_id);
58 
59  domain_params = EC_Group(ecc_param_id);
60 
61  SecureVector<byte> bits;
62  BER_Decoder(key_bits).decode(bits, OCTET_STRING);
63 
64  const size_t part_size = bits.size() / 2;
65 
66  // Keys are stored in little endian format (WTF)
67  for(size_t i = 0; i != part_size / 2; ++i)
68  {
69  std::swap(bits[i], bits[part_size-1-i]);
70  std::swap(bits[part_size+i], bits[2*part_size-1-i]);
71  }
72 
73  BigInt x(&bits[0], part_size);
74  BigInt y(&bits[part_size], part_size);
75 
76  public_key = PointGFp(domain().get_curve(), x, y);
77 
79  "Loaded GOST 34.10 public key not on the curve");
80  }
const EC_Group & domain() const
Definition: ecc_key.h:60
PointGFp public_key
Definition: ecc_key.h:85
#define BOTAN_ASSERT(expr, msg)
Definition: assert.h:19
bool on_the_curve() const
Definition: point_gfp.cpp:419
void swap(Botan::MemoryRegion< T > &x, Botan::MemoryRegion< T > &y)
Definition: secmem.h:425
EC_Group domain_params
Definition: ecc_key.h:84
Botan::GOST_3410_PublicKey::GOST_3410_PublicKey ( )
inlineprotected

Definition at line 64 of file gost_3410.h.

64 {}

Member Function Documentation

std::string Botan::GOST_3410_PublicKey::algo_name ( ) const
inlinevirtual

Get this keys algorithm name.

Returns
this keys algorithm name

Implements Botan::Public_Key.

Definition at line 44 of file gost_3410.h.

44 { return "GOST-34.10"; }
AlgorithmIdentifier Botan::GOST_3410_PublicKey::algorithm_identifier ( ) const
virtual
Returns
X.509 AlgorithmIdentifier for this key

Reimplemented from Botan::EC_PublicKey.

Definition at line 40 of file gost_3410.cpp.

References Botan::EC_PublicKey::domain(), Botan::DER_Encoder::encode(), Botan::DER_Encoder::end_cons(), Botan::DER_Encoder::get_contents(), Botan::Public_Key::get_oid(), Botan::SEQUENCE, and Botan::DER_Encoder::start_cons().

41  {
42  MemoryVector<byte> params =
43  DER_Encoder().start_cons(SEQUENCE)
44  .encode(OID(domain().get_oid()))
45  .end_cons()
46  .get_contents();
47 
48  return AlgorithmIdentifier(get_oid(), params);
49  }
const EC_Group & domain() const
Definition: ecc_key.h:60
virtual OID get_oid() const
Definition: pk_keys.cpp:17
bool Botan::EC_PublicKey::check_key ( RandomNumberGenerator rng,
bool  strong 
) const
virtualinherited

Test the key values for consistency.

Parameters
rngrng to use
strongwhether 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.

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

41  {
42  return public_point().on_the_curve();
43  }
const PointGFp & public_point() const
Definition: ecc_key.h:45
bool on_the_curve() const
Definition: point_gfp.cpp:419
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.

Referenced by Botan::EC_PublicKey::algorithm_identifier().

73  { return domain().DER_encode(domain_format()); }
const EC_Group & domain() const
Definition: ecc_key.h:60
SecureVector< byte > DER_encode(EC_Group_Encoding form) const
Definition: ec_group.cpp:95
EC_Group_Encoding domain_format() const
Definition: ecc_key.h:79
const EC_Group& Botan::EC_PublicKey::domain ( ) const
inlineinherited

Get the domain parameters of this key.

Exceptions
Invalid_Stateis 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.

Referenced by algorithm_identifier(), Botan::EC_PrivateKey::EC_PrivateKey(), Botan::EC_PublicKey::EC_PublicKey(), Botan::ECDH_KA_Operation::ECDH_KA_Operation(), and GOST_3410_PublicKey().

60 { return domain_params; }
EC_Group domain_params
Definition: ecc_key.h:84
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.

80  { return domain_encoding; }
EC_Group_Encoding domain_encoding
Definition: ecc_key.h:86
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.

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

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

18  {
19  try {
20  return OIDS::lookup(algo_name());
21  }
22  catch(Lookup_Error)
23  {
24  throw Lookup_Error("PK algo " + algo_name() + " has no defined OIDs");
25  }
26  }
virtual std::string algo_name() const =0
std::string lookup(const OID &oid)
Definition: oids.cpp:31
void Botan::Public_Key::load_check ( RandomNumberGenerator rng) const
protectedvirtualinherited

Self-test after loading a key

Parameters
rnga random number generator

Reimplemented in Botan::Private_Key.

Definition at line 31 of file pk_keys.cpp.

References Botan::Public_Key::algo_name(), and Botan::Public_Key::check_key().

32  {
33  if(!check_key(rng, BOTAN_PUBLIC_KEY_STRONG_CHECKS_ON_LOAD))
34  throw Invalid_Argument(algo_name() + ": Invalid public key");
35  }
virtual bool check_key(RandomNumberGenerator &rng, bool strong) const =0
virtual std::string algo_name() const =0
std::invalid_argument Invalid_Argument
Definition: exceptn.h:20
RandomNumberGenerator * rng
Definition: global_rng.cpp:165
size_t Botan::GOST_3410_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
the maximum number of input bits

Implements Botan::Public_Key.

Definition at line 56 of file gost_3410.h.

56 { return domain().get_order().bits(); }
const EC_Group & domain() const
Definition: ecc_key.h:60
size_t bits() const
Definition: bigint.cpp:253
const BigInt & get_order() const
Definition: ec_group.h:101
size_t Botan::GOST_3410_PublicKey::message_part_size ( ) const
inlinevirtual

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

Returns
size of the message parts in bits

Reimplemented from Botan::Public_Key.

Definition at line 60 of file gost_3410.h.

61  { return domain().get_order().bytes(); }
const EC_Group & domain() const
Definition: ecc_key.h:60
const BigInt & get_order() const
Definition: ec_group.h:101
size_t bytes() const
Definition: bigint.cpp:245
size_t Botan::GOST_3410_PublicKey::message_parts ( ) const
inlinevirtual

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

Returns
number of message parts

Reimplemented from Botan::Public_Key.

Definition at line 58 of file gost_3410.h.

58 { return 2; }
const PointGFp& Botan::EC_PublicKey::public_point ( ) const
inlineinherited

Get the public point of this key.

Exceptions
Invalid_Stateis 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.

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

45 { return public_key; }
PointGFp public_key
Definition: ecc_key.h:85
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
encthe encoding to use

Definition at line 55 of file ecc_key.cpp.

References Botan::EC_PublicKey::domain_encoding, Botan::EC_PublicKey::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().

56  {
57  if(form != EC_DOMPAR_ENC_EXPLICIT &&
58  form != EC_DOMPAR_ENC_IMPLICITCA &&
59  form != EC_DOMPAR_ENC_OID)
60  throw Invalid_Argument("Invalid encoding form for EC-key object specified");
61 
62  if((form == EC_DOMPAR_ENC_OID) && (domain_params.get_oid() == ""))
63  throw Invalid_Argument("Invalid encoding form OID specified for "
64  "EC-key object whose corresponding domain "
65  "parameters are without oid");
66 
67  domain_encoding = form;
68  }
std::string get_oid() const
Definition: ec_group.h:115
std::invalid_argument Invalid_Argument
Definition: exceptn.h:20
EC_Group_Encoding domain_encoding
Definition: ecc_key.h:86
EC_Group domain_params
Definition: ecc_key.h:84
MemoryVector< byte > Botan::GOST_3410_PublicKey::x509_subject_public_key ( ) const
virtual
Returns
X.509 subject key encoding for this key object

Reimplemented from Botan::EC_PublicKey.

Definition at line 17 of file gost_3410.cpp.

References Botan::BigInt::binary_encode(), Botan::BigInt::bytes(), Botan::DER_Encoder::encode(), Botan::PointGFp::get_affine_x(), Botan::PointGFp::get_affine_y(), Botan::DER_Encoder::get_contents(), Botan::OCTET_STRING, Botan::EC_PublicKey::public_point(), and std::swap().

18  {
19  // Trust CryptoPro to come up with something obnoxious
20  const BigInt x = public_point().get_affine_x();
21  const BigInt y = public_point().get_affine_y();
22 
23  size_t part_size = std::max(x.bytes(), y.bytes());
24 
25  MemoryVector<byte> bits(2*part_size);
26 
27  x.binary_encode(&bits[part_size - x.bytes()]);
28  y.binary_encode(&bits[2*part_size - y.bytes()]);
29 
30  // Keys are stored in little endian format (WTF)
31  for(size_t i = 0; i != part_size / 2; ++i)
32  {
33  std::swap(bits[i], bits[part_size-1-i]);
34  std::swap(bits[part_size+i], bits[2*part_size-1-i]);
35  }
36 
37  return DER_Encoder().encode(bits, OCTET_STRING).get_contents();
38  }
BigInt get_affine_y() const
Definition: point_gfp.cpp:406
const PointGFp & public_point() const
Definition: ecc_key.h:45
BigInt get_affine_x() const
Definition: point_gfp.cpp:392
void swap(Botan::MemoryRegion< T > &x, Botan::MemoryRegion< T > &y)
Definition: secmem.h:425

Member Data Documentation

EC_Group_Encoding Botan::EC_PublicKey::domain_encoding
protectedinherited
EC_Group Botan::EC_PublicKey::domain_params
protectedinherited
PointGFp Botan::EC_PublicKey::public_key
protectedinherited

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