aboutsummaryrefslogtreecommitdiffstats
path: root/src/pubkey/nr/nr.h
blob: 013f3d42b84a7f727d0bc29bee952f334423c4a9 (plain)
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
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
/*
* Nyberg-Rueppel
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/

#ifndef BOTAN_NYBERG_RUEPPEL_H__
#define BOTAN_NYBERG_RUEPPEL_H__

#include <botan/dl_algo.h>
#include <botan/pk_ops.h>
#include <botan/nr_core.h>

namespace Botan {

/*
* Nyberg-Rueppel Public Key
*/
class BOTAN_DLL NR_PublicKey : public PK_Verifying_with_MR_Key,
                               public virtual DL_Scheme_PublicKey
   {
   public:
      std::string algo_name() const { return "NR"; }

      SecureVector<byte> verify(const byte sig[], u32bit sig_len) const;

      DL_Group::Format group_format() const { return DL_Group::ANSI_X9_57; }

      u32bit message_parts() const { return 2; }
      u32bit message_part_size() const { return group_q().bytes(); }
      u32bit max_input_bits() const { return (group_q().bits() - 1); }

      NR_PublicKey(const AlgorithmIdentifier& alg_id,
                   const MemoryRegion<byte>& key_bits);

      NR_PublicKey(const DL_Group& group, const BigInt& pub_key);
   protected:
      NR_PublicKey() {}
      NR_Core core;
   };

/*
* Nyberg-Rueppel Private Key
*/
class BOTAN_DLL NR_PrivateKey : public NR_PublicKey,
                                public PK_Signing_Key,
                                public virtual DL_Scheme_PrivateKey
   {
   public:
      SecureVector<byte> sign(const byte msg[], u32bit msg_len,
                              RandomNumberGenerator& rng) const;

      bool check_key(RandomNumberGenerator& rng, bool strong) const;

      NR_PrivateKey(const AlgorithmIdentifier& alg_id,
                    const MemoryRegion<byte>& key_bits,
                    RandomNumberGenerator& rng);

      NR_PrivateKey(RandomNumberGenerator& rng,
                    const DL_Group& group,
                    const BigInt& x = 0);
   };

class BOTAN_DLL NR_Signature_Operation : public PK_Ops::Signature_Operation
   {
   public:
      NR_Signature_Operation(const NR_PrivateKey& nr);

      u32bit message_parts() const { return 2; }
      u32bit message_part_size() const { return q.bytes(); }
      u32bit max_input_bits() const { return (q.bits() - 1); }

      SecureVector<byte> sign(const byte msg[], u32bit msg_len,
                              RandomNumberGenerator& rng);
   private:
      const BigInt& q;
      const BigInt& x;
      Fixed_Base_Power_Mod powermod_g_p;
      Modular_Reducer mod_q;
   };

}

#endif