/usr/include/botan/def_powm.h is in libbotan1.8-dev 1.8.13-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | /*
* Modular Exponentiation
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_DEFAULT_MODEXP_H__
#define BOTAN_DEFAULT_MODEXP_H__
#include <botan/pow_mod.h>
#include <botan/reducer.h>
#include <vector>
namespace Botan {
/*
* Fixed Window Exponentiator
*/
class BOTAN_DLL Fixed_Window_Exponentiator : public Modular_Exponentiator
{
public:
void set_exponent(const BigInt&);
void set_base(const BigInt&);
BigInt execute() const;
Modular_Exponentiator* copy() const
{ return new Fixed_Window_Exponentiator(*this); }
Fixed_Window_Exponentiator(const BigInt&, Power_Mod::Usage_Hints);
private:
Modular_Reducer reducer;
BigInt exp;
u32bit window_bits;
std::vector<BigInt> g;
Power_Mod::Usage_Hints hints;
};
/*
* Montgomery Exponentiator
*/
class BOTAN_DLL Montgomery_Exponentiator : public Modular_Exponentiator
{
public:
void set_exponent(const BigInt&);
void set_base(const BigInt&);
BigInt execute() const;
Modular_Exponentiator* copy() const
{ return new Montgomery_Exponentiator(*this); }
Montgomery_Exponentiator(const BigInt&, Power_Mod::Usage_Hints);
private:
BigInt exp, modulus;
BigInt R2, R_mod;
std::vector<BigInt> g;
word mod_prime;
u32bit mod_words, exp_bits, window_bits;
Power_Mod::Usage_Hints hints;
};
}
#endif
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