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/*
* DSA
* (C) 1999-2010 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_DSA_H__
#define BOTAN_DSA_H__
#include <botan/dl_algo.h>
namespace Botan {
/**
* DSA Public Key
*/
class BOTAN_DLL DSA_PublicKey : public virtual DL_Scheme_PublicKey
{
public:
std::string algo_name() const override { return "DSA"; }
DL_Group::Format group_format() const override { return DL_Group::ANSI_X9_57; }
size_t message_parts() const override { return 2; }
size_t message_part_size() const override { return group_q().bytes(); }
/**
* Load a public key.
* @param alg_id the X.509 algorithm identifier
* @param key_bits DER encoded public key 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)
{
}
/**
* Create a public key.
* @param group the underlying DL group
* @param y the public value y = g^x mod p
*/
DSA_PublicKey(const DL_Group& group, const BigInt& y);
std::unique_ptr<PK_Ops::Verification>
create_verification_op(const std::string& params,
const std::string& provider) const override;
protected:
DSA_PublicKey() {}
};
/**
* DSA Private Key
*/
class BOTAN_DLL DSA_PrivateKey : public DSA_PublicKey,
public virtual DL_Scheme_PrivateKey
{
public:
/**
* Load a private key.
* @param alg_id the X.509 algorithm identifier
* @param key_bits PKCS#8 structure
*/
DSA_PrivateKey(const AlgorithmIdentifier& alg_id,
const secure_vector<byte>& key_bits);
/**
* Create a private key.
* @param rng the RNG to use
* @param group the underlying DL group
* @param private_key the private key (if zero, a new random key is generated)
*/
DSA_PrivateKey(RandomNumberGenerator& rng,
const DL_Group& group,
const BigInt& private_key = 0);
bool check_key(RandomNumberGenerator& rng, bool strong) const override;
std::unique_ptr<PK_Ops::Signature>
create_signature_op(RandomNumberGenerator& rng,
const std::string& params,
const std::string& provider) const override;
};
}
#endif
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