/usr/include/botan-1.10/botan/reducer.h is in libbotan1.10-dev 1.10.5-1ubuntu1.
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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 | /*
* Modular Reducer
* (C) 1999-2010 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_MODULAR_REDUCER_H__
#define BOTAN_MODULAR_REDUCER_H__
#include <botan/numthry.h>
namespace Botan {
/**
* Modular Reducer (using Barrett's technique)
*/
class BOTAN_DLL Modular_Reducer
{
public:
const BigInt& get_modulus() const { return modulus; }
BigInt reduce(const BigInt& x) const;
/**
* Multiply mod p
* @param x
* @param y
* @return (x * y) % p
*/
BigInt multiply(const BigInt& x, const BigInt& y) const
{ return reduce(x * y); }
/**
* Square mod p
* @param x
* @return (x * x) % p
*/
BigInt square(const BigInt& x) const
{ return reduce(Botan::square(x)); }
/**
* Cube mod p
* @param x
* @return (x * x * x) % p
*/
BigInt cube(const BigInt& x) const
{ return multiply(x, this->square(x)); }
bool initialized() const { return (mod_words != 0); }
Modular_Reducer() { mod_words = 0; }
Modular_Reducer(const BigInt& mod);
private:
BigInt modulus, modulus_2, mu;
size_t mod_words;
};
}
#endif
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