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/*************************************************
* Discrete Logarithm Group Header File *
* (C) 1999-2007 The Botan Project *
*************************************************/
#ifndef BOTAN_DL_PARAM_H__
#define BOTAN_DL_PARAM_H__
#include <botan/bigint.h>
#include <botan/data_src.h>
namespace Botan {
/*************************************************
* Discrete Logarithm Group *
*************************************************/
class DL_Group
{
public:
const BigInt& get_p() const;
const BigInt& get_q() const;
const BigInt& get_g() const;
enum Format { ANSI_X9_42, ANSI_X9_57, PKCS_3 };
enum PrimeType { Strong, Prime_Subgroup, DSA_Kosherizer };
bool verify_group(bool) const;
std::string PEM_encode(Format) const;
SecureVector<byte> DER_encode(Format) const;
void BER_decode(DataSource&, Format);
void PEM_decode(DataSource&);
static BigInt make_dsa_generator(const BigInt&, const BigInt&);
DL_Group();
DL_Group(const std::string&);
DL_Group(u32bit, PrimeType = Strong);
DL_Group(const MemoryRegion<byte>&, u32bit = 1024, u32bit = 0);
DL_Group(const BigInt&, const BigInt&);
DL_Group(const BigInt&, const BigInt&, const BigInt&);
private:
void init_check() const;
void initialize(const BigInt&, const BigInt&, const BigInt&);
bool initialized;
BigInt p, q, g;
};
}
#endif
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