/usr/include/botan-1.10/botan/pow_mod.h is in libbotan1.10-dev 1.10.16-1.
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 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 | /*
* Modular Exponentiator
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_POWER_MOD_H__
#define BOTAN_POWER_MOD_H__
#include <botan/bigint.h>
namespace Botan {
/**
* Modular Exponentiator Interface
*/
class BOTAN_DLL Modular_Exponentiator
{
public:
virtual void set_base(const BigInt&) = 0;
virtual void set_exponent(const BigInt&) = 0;
virtual BigInt execute() const = 0;
virtual Modular_Exponentiator* copy() const = 0;
virtual ~Modular_Exponentiator() {}
};
/**
* Modular Exponentiator Proxy
*/
class BOTAN_DLL Power_Mod
{
public:
enum Usage_Hints {
NO_HINTS = 0x0000,
BASE_IS_FIXED = 0x0001,
BASE_IS_SMALL = 0x0002,
BASE_IS_LARGE = 0x0004,
BASE_IS_2 = 0x0008,
EXP_IS_FIXED = 0x0100,
EXP_IS_SMALL = 0x0200,
EXP_IS_LARGE = 0x0400
};
/*
* Try to choose a good window size
*/
static size_t window_bits(size_t exp_bits, size_t base_bits,
Power_Mod::Usage_Hints hints);
void set_modulus(const BigInt&, Usage_Hints = NO_HINTS) const;
void set_base(const BigInt&) const;
void set_exponent(const BigInt&) const;
BigInt execute() const;
Power_Mod& operator=(const Power_Mod&);
Power_Mod(const BigInt& = 0, Usage_Hints = NO_HINTS);
Power_Mod(const Power_Mod&);
virtual ~Power_Mod();
private:
mutable Modular_Exponentiator* core;
Usage_Hints hints;
};
/**
* Fixed Exponent Modular Exponentiator Proxy
*/
class BOTAN_DLL Fixed_Exponent_Power_Mod : public Power_Mod
{
public:
BigInt operator()(const BigInt& b) const
{ set_base(b); return execute(); }
Fixed_Exponent_Power_Mod() {}
Fixed_Exponent_Power_Mod(const BigInt&, const BigInt&,
Usage_Hints = NO_HINTS);
};
/**
* Fixed Base Modular Exponentiator Proxy
*/
class BOTAN_DLL Fixed_Base_Power_Mod : public Power_Mod
{
public:
BigInt operator()(const BigInt& e) const
{ set_exponent(e); return execute(); }
Fixed_Base_Power_Mod() {}
Fixed_Base_Power_Mod(const BigInt&, const BigInt&,
Usage_Hints = NO_HINTS);
};
}
#endif
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