Botan 1.10.17

def_powm.h
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1 /*
2 * Modular Exponentiation
3 * (C) 1999-2007 Jack Lloyd
4 *
5 * Distributed under the terms of the Botan license
6 */
7
8 #ifndef BOTAN_DEFAULT_MODEXP_H__
9 #define BOTAN_DEFAULT_MODEXP_H__
10
11 #include <botan/pow_mod.h>
12 #include <botan/reducer.h>
13 #include <vector>
14
15 namespace Botan {
16
17 /**
18 * Fixed Window Exponentiator
19 */
20 class Fixed_Window_Exponentiator : public Modular_Exponentiator
21 {
22 public:
23 void set_exponent(const BigInt&);
24 void set_base(const BigInt&);
25 BigInt execute() const;
26
27 Modular_Exponentiator* copy() const
28 { return new Fixed_Window_Exponentiator(*this); }
29
30 Fixed_Window_Exponentiator(const BigInt&, Power_Mod::Usage_Hints);
31 private:
32 Modular_Reducer reducer;
33 BigInt exp;
34 size_t window_bits;
35 std::vector<BigInt> g;
36 Power_Mod::Usage_Hints hints;
37 };
38
39 /**
40 * Montgomery Exponentiator
41 */
42 class Montgomery_Exponentiator : public Modular_Exponentiator
43 {
44 public:
45 void set_exponent(const BigInt&);
46 void set_base(const BigInt&);
47 BigInt execute() const;
48
49 Modular_Exponentiator* copy() const
50 { return new Montgomery_Exponentiator(*this); }
51
52 Montgomery_Exponentiator(const BigInt&, Power_Mod::Usage_Hints);
53 private:
54 BigInt exp, modulus;
55 BigInt R2, R_mod;
56 std::vector<BigInt> g;
57 word mod_prime;
58 size_t mod_words, exp_bits, window_bits;
59 Power_Mod::Usage_Hints hints;
60 };
61
62 }
63
64 #endif
Botan::Fixed_Window_Exponentiator::Fixed_Window_Exponentiator
Fixed_Window_Exponentiator(const BigInt &, Power_Mod::Usage_Hints)
Definition: powm_fw.cpp:61
Botan::Fixed_Window_Exponentiator::execute
BigInt execute() const
Definition: powm_fw.cpp:40
Botan::BigInt
Definition: bigint.h:22
Botan::Montgomery_Exponentiator::set_exponent
void set_exponent(const BigInt &)
Definition: powm_mnt.cpp:17
Botan::Montgomery_Exponentiator::Montgomery_Exponentiator
Montgomery_Exponentiator(const BigInt &, Power_Mod::Usage_Hints)
Definition: powm_mnt.cpp:130
Botan
Definition: algo_base.h:14
Botan::Montgomery_Exponentiator
Definition: def_powm.h:42
Botan::Power_Mod::Usage_Hints
Usage_Hints
Definition: pow_mod.h:35
Botan::Fixed_Window_Exponentiator
Definition: def_powm.h:20
Botan::Montgomery_Exponentiator::set_base
void set_base(const BigInt &)
Definition: powm_mnt.cpp:26
Botan::Fixed_Window_Exponentiator::set_base
void set_base(const BigInt &)
Definition: powm_fw.cpp:25
Botan::Montgomery_Exponentiator::copy
Modular_Exponentiator * copy() const
Definition: def_powm.h:49
Botan::Fixed_Window_Exponentiator::copy
Modular_Exponentiator * copy() const
Definition: def_powm.h:27
Botan::Fixed_Window_Exponentiator::set_exponent
void set_exponent(const BigInt &)
Definition: powm_fw.cpp:17
Botan::Modular_Reducer
Definition: reducer.h:18
Botan::Montgomery_Exponentiator::execute
BigInt execute() const
Definition: powm_mnt.cpp:78
Botan::Modular_Exponentiator
Definition: pow_mod.h:18