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/*************************************************
* Discrete Logarithm Group Header File *
* (C) 1999-2008 Jack Lloyd *
*************************************************/
#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 BOTAN_DLL 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,
DSA_PARAMETERS = ANSI_X9_57,
DH_PARAMETERS = ANSI_X9_42,
X942_DH_PARAMETERS = ANSI_X9_42,
PKCS3_DH_PARAMETERS = PKCS_3
};
enum PrimeType { Strong, Prime_Subgroup, DSA_Kosherizer };
bool verify_group(RandomNumberGenerator& rng, bool) const;
std::string PEM_encode(Format) const;
SecureVector<byte> DER_encode(Format) const;
void BER_decode(DataSource&, Format);
void PEM_decode(DataSource&);
DL_Group();
DL_Group(const std::string&);
DL_Group(RandomNumberGenerator& rng, PrimeType, u32bit, u32bit = 0);
DL_Group(RandomNumberGenerator& rng, const MemoryRegion<byte>&,
u32bit = 1024, u32bit = 0);
DL_Group(const BigInt& p, const BigInt& g);
DL_Group(const BigInt& p, const BigInt& g, const BigInt& q);
private:
static BigInt make_dsa_generator(const BigInt&, const BigInt&);
static SecureVector<byte>
generate_dsa_primes(RandomNumberGenerator& rng,
BigInt& p, BigInt& q,
u32bit pbits, u32bit qbits);
static bool generate_dsa_primes(RandomNumberGenerator&,
BigInt&, BigInt&, u32bit, u32bit,
const MemoryRegion<byte>&);
void init_check() const;
void initialize(const BigInt&, const BigInt&, const BigInt&);
bool initialized;
BigInt p, q, g;
};
}
#endif
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