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/*
* DSA
* (C) 1999-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_DSA_H__
#define BOTAN_DSA_H__
#include <botan/dl_algo.h>
#include <botan/pk_ops.h>
#include <botan/reducer.h>
#include <botan/pow_mod.h>
namespace Botan {
/**
* DSA Public Key
*/
class BOTAN_DLL DSA_PublicKey : public virtual DL_Scheme_PublicKey
{
public:
std::string algo_name() const { return "DSA"; }
DL_Group::Format group_format() const { return DL_Group::ANSI_X9_57; }
size_t message_parts() const { return 2; }
size_t message_part_size() const { return group_q().bytes(); }
size_t max_input_bits() const { return group_q().bits(); }
DSA_PublicKey(const AlgorithmIdentifier& alg_id,
const secure_vector<byte>& key_bits) :
DL_Scheme_PublicKey(alg_id, key_bits, DL_Group::ANSI_X9_57)
{
}
DSA_PublicKey(const DL_Group& group, const BigInt& y);
protected:
DSA_PublicKey() {}
};
/**
* DSA Private Key
*/
class BOTAN_DLL DSA_PrivateKey : public DSA_PublicKey,
public virtual DL_Scheme_PrivateKey
{
public:
DSA_PrivateKey(const AlgorithmIdentifier& alg_id,
const secure_vector<byte>& key_bits,
RandomNumberGenerator& rng);
DSA_PrivateKey(RandomNumberGenerator& rng,
const DL_Group& group,
const BigInt& private_key = 0);
bool check_key(RandomNumberGenerator& rng, bool strong) const;
};
/**
* Object that can create a DSA signature
*/
class BOTAN_DLL DSA_Signature_Operation : public PK_Ops::Signature
{
public:
DSA_Signature_Operation(const DSA_PrivateKey& dsa, const std::string& hash);
size_t message_parts() const { return 2; }
size_t message_part_size() const { return q.bytes(); }
size_t max_input_bits() const { return q.bits(); }
secure_vector<byte> sign(const byte msg[], size_t msg_len,
RandomNumberGenerator& rng);
private:
const BigInt& q;
const BigInt& x;
Fixed_Base_Power_Mod powermod_g_p;
Modular_Reducer mod_q;
std::string m_hash;
};
/**
* Object that can verify a DSA signature
*/
class BOTAN_DLL DSA_Verification_Operation : public PK_Ops::Verification
{
public:
DSA_Verification_Operation(const DSA_PublicKey& dsa);
size_t message_parts() const { return 2; }
size_t message_part_size() const { return q.bytes(); }
size_t max_input_bits() const { return q.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 BigInt& q;
const BigInt& y;
Fixed_Base_Power_Mod powermod_g_p, powermod_y_p;
Modular_Reducer mod_p, mod_q;
};
}
#endif
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