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/*
* ECDSA
* (C) 2007 Falko Strenzke, FlexSecure GmbH
* Manuel Hartl, FlexSecure GmbH
* (C) 2008-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_ECDSA_KEY_H__
#define BOTAN_ECDSA_KEY_H__
#include <botan/ecc_key.h>
#include <botan/reducer.h>
#include <botan/pk_ops.h>
namespace Botan {
/**
* This class represents ECDSA Public Keys.
*/
class BOTAN_DLL ECDSA_PublicKey : public virtual EC_PublicKey
{
public:
/**
* Construct a public key from a given public point.
* @param dom_par the domain parameters associated with this key
* @param public_point the public point defining this key
*/
ECDSA_PublicKey(const EC_Group& dom_par,
const PointGFp& public_point) :
EC_PublicKey(dom_par, public_point) {}
ECDSA_PublicKey(const AlgorithmIdentifier& alg_id,
const secure_vector<byte>& key_bits) :
EC_PublicKey(alg_id, key_bits) {}
/**
* Get this keys algorithm name.
* @result this keys algorithm name ("ECDSA")
*/
std::string algo_name() const { return "ECDSA"; }
/**
* Get the maximum number of bits allowed to be fed to this key.
* This is the bitlength of the order of the base point.
* @result the maximum number of input bits
*/
size_t max_input_bits() const { return domain().get_order().bits(); }
size_t message_parts() const { return 2; }
size_t message_part_size() const
{ return domain().get_order().bytes(); }
protected:
ECDSA_PublicKey() {}
};
/**
* This class represents ECDSA Private Keys
*/
class BOTAN_DLL ECDSA_PrivateKey : public ECDSA_PublicKey,
public EC_PrivateKey
{
public:
/**
* Load a private key
* @param alg_id the X.509 algorithm identifier
* @param key_bits PKCS #8 structure
*/
ECDSA_PrivateKey(const AlgorithmIdentifier& alg_id,
const secure_vector<byte>& key_bits) :
EC_PrivateKey(alg_id, key_bits) {}
/**
* Generate a new private key
* @param rng a random number generator
* @param domain parameters to used for this key
* @param x the private key (if zero, generate a ney random key)
*/
ECDSA_PrivateKey(RandomNumberGenerator& rng,
const EC_Group& domain,
const BigInt& x = 0) :
EC_PrivateKey(rng, domain, x) {}
bool check_key(RandomNumberGenerator& rng, bool) const;
};
/**
* ECDSA signature operation
*/
class BOTAN_DLL ECDSA_Signature_Operation : public PK_Ops::Signature
{
public:
ECDSA_Signature_Operation(const ECDSA_PrivateKey& ecdsa);
secure_vector<byte> sign(const byte msg[], size_t msg_len,
RandomNumberGenerator& rng);
size_t message_parts() const { return 2; }
size_t message_part_size() const { return order.bytes(); }
size_t max_input_bits() const { return order.bits(); }
private:
const PointGFp& base_point;
const BigInt& order;
const BigInt& x;
Modular_Reducer mod_order;
};
/**
* ECDSA verification operation
*/
class BOTAN_DLL ECDSA_Verification_Operation : public PK_Ops::Verification
{
public:
ECDSA_Verification_Operation(const ECDSA_PublicKey& ecdsa);
size_t message_parts() const { return 2; }
size_t message_part_size() const { return order.bytes(); }
size_t max_input_bits() const { return order.bits(); }
bool with_recovery() const { return false; }
bool verify(const byte msg[], size_t msg_len,
const byte sig[], size_t sig_len);
private:
const PointGFp& base_point;
const PointGFp& public_point;
const BigInt& order;
};
}
#endif
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