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Diffstat (limited to 'CryptoPP/modarith.h')
| -rw-r--r-- | CryptoPP/modarith.h | 158 |
1 files changed, 0 insertions, 158 deletions
diff --git a/CryptoPP/modarith.h b/CryptoPP/modarith.h deleted file mode 100644 index c0368e3fb..000000000 --- a/CryptoPP/modarith.h +++ /dev/null @@ -1,158 +0,0 @@ -#ifndef CRYPTOPP_MODARITH_H -#define CRYPTOPP_MODARITH_H - -// implementations are in integer.cpp - -#include "cryptlib.h" -#include "misc.h" -#include "integer.h" -#include "algebra.h" - -NAMESPACE_BEGIN(CryptoPP) - -CRYPTOPP_DLL_TEMPLATE_CLASS AbstractGroup<Integer>; -CRYPTOPP_DLL_TEMPLATE_CLASS AbstractRing<Integer>; -CRYPTOPP_DLL_TEMPLATE_CLASS AbstractEuclideanDomain<Integer>; - -//! ring of congruence classes modulo n -/*! \note this implementation represents each congruence class as the smallest non-negative integer in that class */ -class CRYPTOPP_DLL ModularArithmetic : public AbstractRing<Integer> -{ -public: - - typedef int RandomizationParameter; - typedef Integer Element; - - ModularArithmetic(const Integer &modulus = Integer::One()) - : m_modulus(modulus), m_result((word)0, modulus.reg.size()) {} - - ModularArithmetic(const ModularArithmetic &ma) - : m_modulus(ma.m_modulus), m_result((word)0, m_modulus.reg.size()) {} - - ModularArithmetic(BufferedTransformation &bt); // construct from BER encoded parameters - - virtual ModularArithmetic * Clone() const {return new ModularArithmetic(*this);} - - void DEREncode(BufferedTransformation &bt) const; - - void DEREncodeElement(BufferedTransformation &out, const Element &a) const; - void BERDecodeElement(BufferedTransformation &in, Element &a) const; - - const Integer& GetModulus() const {return m_modulus;} - void SetModulus(const Integer &newModulus) {m_modulus = newModulus; m_result.reg.resize(m_modulus.reg.size());} - - virtual bool IsMontgomeryRepresentation() const {return false;} - - virtual Integer ConvertIn(const Integer &a) const - {return a%m_modulus;} - - virtual Integer ConvertOut(const Integer &a) const - {return a;} - - const Integer& Half(const Integer &a) const; - - bool Equal(const Integer &a, const Integer &b) const - {return a==b;} - - const Integer& Identity() const - {return Integer::Zero();} - - const Integer& Add(const Integer &a, const Integer &b) const; - - Integer& Accumulate(Integer &a, const Integer &b) const; - - const Integer& Inverse(const Integer &a) const; - - const Integer& Subtract(const Integer &a, const Integer &b) const; - - Integer& Reduce(Integer &a, const Integer &b) const; - - const Integer& Double(const Integer &a) const - {return Add(a, a);} - - const Integer& MultiplicativeIdentity() const - {return Integer::One();} - - const Integer& Multiply(const Integer &a, const Integer &b) const - {return m_result1 = a*b%m_modulus;} - - const Integer& Square(const Integer &a) const - {return m_result1 = a.Squared()%m_modulus;} - - bool IsUnit(const Integer &a) const - {return Integer::Gcd(a, m_modulus).IsUnit();} - - const Integer& MultiplicativeInverse(const Integer &a) const - {return m_result1 = a.InverseMod(m_modulus);} - - const Integer& Divide(const Integer &a, const Integer &b) const - {return Multiply(a, MultiplicativeInverse(b));} - - Integer CascadeExponentiate(const Integer &x, const Integer &e1, const Integer &y, const Integer &e2) const; - - void SimultaneousExponentiate(Element *results, const Element &base, const Integer *exponents, unsigned int exponentsCount) const; - - unsigned int MaxElementBitLength() const - {return (m_modulus-1).BitCount();} - - unsigned int MaxElementByteLength() const - {return (m_modulus-1).ByteCount();} - - Element RandomElement( RandomNumberGenerator &rng , const RandomizationParameter &ignore_for_now = 0 ) const - // left RandomizationParameter arg as ref in case RandomizationParameter becomes a more complicated struct - { - return Element( rng , Integer( (long) 0) , m_modulus - Integer( (long) 1 ) ) ; - } - - bool operator==(const ModularArithmetic &rhs) const - {return m_modulus == rhs.m_modulus;} - - static const RandomizationParameter DefaultRandomizationParameter ; - -protected: - Integer m_modulus; - mutable Integer m_result, m_result1; - -}; - -// const ModularArithmetic::RandomizationParameter ModularArithmetic::DefaultRandomizationParameter = 0 ; - -//! do modular arithmetics in Montgomery representation for increased speed -/*! \note the Montgomery representation represents each congruence class [a] as a*r%n, where r is a convenient power of 2 */ -class CRYPTOPP_DLL MontgomeryRepresentation : public ModularArithmetic -{ -public: - MontgomeryRepresentation(const Integer &modulus); // modulus must be odd - - virtual ModularArithmetic * Clone() const {return new MontgomeryRepresentation(*this);} - - bool IsMontgomeryRepresentation() const {return true;} - - Integer ConvertIn(const Integer &a) const - {return (a<<(WORD_BITS*m_modulus.reg.size()))%m_modulus;} - - Integer ConvertOut(const Integer &a) const; - - const Integer& MultiplicativeIdentity() const - {return m_result1 = Integer::Power2(WORD_BITS*m_modulus.reg.size())%m_modulus;} - - const Integer& Multiply(const Integer &a, const Integer &b) const; - - const Integer& Square(const Integer &a) const; - - const Integer& MultiplicativeInverse(const Integer &a) const; - - Integer CascadeExponentiate(const Integer &x, const Integer &e1, const Integer &y, const Integer &e2) const - {return AbstractRing<Integer>::CascadeExponentiate(x, e1, y, e2);} - - void SimultaneousExponentiate(Element *results, const Element &base, const Integer *exponents, unsigned int exponentsCount) const - {AbstractRing<Integer>::SimultaneousExponentiate(results, base, exponents, exponentsCount);} - -private: - Integer m_u; - mutable IntegerSecBlock m_workspace; -}; - -NAMESPACE_END - -#endif |