1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
|
/*
* ElGamal
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_ELGAMAL_H__
#define BOTAN_ELGAMAL_H__
#include <botan/dl_algo.h>
namespace Botan {
/**
* ElGamal Public Key
*/
class BOTAN_DLL ElGamal_PublicKey : public virtual DL_Scheme_PublicKey
{
public:
std::string algo_name() const override { return "ElGamal"; }
DL_Group::Format group_format() const override { return DL_Group::ANSI_X9_42; }
size_t max_input_bits() const override { return (group_p().bits() - 1); }
ElGamal_PublicKey(const AlgorithmIdentifier& alg_id,
const secure_vector<byte>& key_bits) :
DL_Scheme_PublicKey(alg_id, key_bits, DL_Group::ANSI_X9_42)
{}
ElGamal_PublicKey(const DL_Group& group, const BigInt& y);
std::unique_ptr<PK_Ops::Encryption>
create_encryption_op(RandomNumberGenerator& rng,
const std::string& params,
const std::string& provider) const override;
protected:
ElGamal_PublicKey() {}
};
/**
* ElGamal Private Key
*/
class BOTAN_DLL ElGamal_PrivateKey : public ElGamal_PublicKey,
public virtual DL_Scheme_PrivateKey
{
public:
bool check_key(RandomNumberGenerator& rng, bool) const override;
ElGamal_PrivateKey(const AlgorithmIdentifier& alg_id,
const secure_vector<byte>& key_bits,
RandomNumberGenerator& rng);
ElGamal_PrivateKey(RandomNumberGenerator& rng,
const DL_Group& group,
const BigInt& priv_key = 0);
std::unique_ptr<PK_Ops::Decryption>
create_decryption_op(RandomNumberGenerator& rng,
const std::string& params,
const std::string& provider) const override;
};
}
#endif
|
