www.pudn.com > miracl.zip > BIG.H
/*
* MIRACL C++ Header file big.h
*
* AUTHOR : N.Coghlan
* Modified by M.Scott
*
* PURPOSE : Definition of class Big
*
* Bigs are normally created on the heap, but by defining BIGS=n
* on the compiler command line, Bigs are instead created from the stack
* Note that n must be same as specified in the main program with for example
*
* Miracl precison(n,0);
*
* where n is the (fixed) size in words of each Big.
*
* This may be faster, as C++ tends to create and destroy lots of
* temporaries. Especially recommended if n is small. Do not use
* for program development
*
* NOTE:- I/O conversion
*
* To convert a hex character string to a Big
*
* Big x;
* char c[100];
*
* mip->IOBASE=16;
* x=c;
*
* To convert a Big to a hex character string
*
* mip->IOBASE=16;
* c << x;
*
* To convert to/from pure binary, see the from_binary()
* and to_binary() friend functions.
*
* int len;
* char c[100];
* ...
* Big x=from_binary(len,c); // creates Big x from len bytes of binary in c
*
* len=to_binary(x,100,c,FALSE); // converts Big x to len bytes binary in c[100]
* len=to_binary(x,100,c,TRUE); // converts Big x to len bytes binary in c[100]
* // (right justified with leading zeros)
*
* Copyright (c) 1988-2001 Shamus Software Ltd.
*/
#ifndef BIG_H
#define BIG_H
#include
#include
#include
extern "C"
{
#include
}
#ifndef MR_NO_STANDARD_IO
#include
using std::istream;
using std::ostream;
#endif
#ifndef MIRACL_CLASS
#define MIRACL_CLASS
class Miracl
{ /* dummy class to initialise MIRACL - MUST be called before any Bigs *
* are created. This could be a problem for static/global data declared *
* in modules other than the main module */
miracl *mr;
public:
Miracl(int nd,mr_small nb=0)
{mr=mirsys(nd,nb);mr->RPOINT=TRUE;}
miracl *operator&() {return mr;}
~Miracl() {mirexit();}
};
#endif
#ifdef BIGS
#define MR_INIT_BIG fn=&b; b.w=a; b.len=0; for (int i=0;i>=(int i) {sftbit(fn,-i,fn); return *this;}
mr_small& operator[](int i) {return fn->w[i];}
BOOL iszero() const;
BOOL isone() const;
int get(int index) { int m; m=getdig(fn,index); return m; }
void set(int index,int n) { putdig(n,fn,index);}
int len() { return numdig(fn); }
big getbig() const;
friend class Flash;
friend Big operator-(const Big&);
friend Big operator+(const Big&,int);
friend Big operator+(int,const Big&);
friend Big operator+(const Big&,const Big&);
friend Big operator-(const Big&, int);
friend Big operator-(int,const Big&);
friend Big operator-(const Big&,const Big&);
friend Big operator*(const Big&, int);
friend Big operator*(int,const Big&);
friend Big operator*(const Big&,const Big&);
friend Big operator/(const Big&,int);
friend Big operator/(const Big&,const Big&);
friend int operator%(const Big&, int);
friend Big operator%(const Big&, const Big&);
friend Big operator<<(const Big&, int);
friend Big operator>>(const Big&, int);
friend BOOL operator<=(const Big& b1,const Big& b2)
{if (compare(b1.fn,b2.fn)<=0) return TRUE; else return FALSE;}
friend BOOL operator>=(const Big& b1,const Big& b2)
{if (compare(b1.fn,b2.fn)>=0) return TRUE; else return FALSE;}
friend BOOL operator==(const Big& b1,const Big& b2)
{if (compare(b1.fn,b2.fn)==0) return TRUE; else return FALSE;}
friend BOOL operator!=(const Big& b1,const Big& b2)
{if (compare(b1.fn,b2.fn)!=0) return TRUE; else return FALSE;}
friend BOOL operator<(const Big& b1,const Big& b2)
{if (compare(b1.fn,b2.fn)<0) return TRUE; else return FALSE;}
friend BOOL operator>(const Big& b1,const Big& b2)
{if (compare(b1.fn,b2.fn)>0) return TRUE; else return FALSE;}
friend Big from_binary(int,char *);
friend int to_binary(const Big&,int,char *,BOOL justify=FALSE);
friend Big modmult(const Big&,const Big&,const Big&);
friend Big norm(const Big&);
friend Big sqrt(const Big&);
friend Big root(const Big&,int);
friend Big gcd(const Big&,const Big&);
friend Big pow(const Big&,int); // x^m
friend Big pow(const Big&, int, const Big&); // x^m mod n
friend Big pow(int, const Big&, const Big&); // x^m mod n
friend Big pow(const Big&, const Big&, const Big&); // x^m mod n
friend Big pow(const Big&, const Big&, const Big&, const Big&, const Big&);
// x^m.y^k mod n
friend Big pow(int,Big *,Big *,Big); // x[0]^m[0].x[1].m[1]... mod n
friend Big luc(const Big& ,const Big&, const Big&, Big *b4=NULL);
friend Big inverse(const Big&, const Big&);
friend void multi_inverse(int,Big*,const Big&,Big *);
friend Big rand(const Big&); // 0 < rand < parameter
friend Big rand(int,int); // (digits,base) e.g. (1024,2)
friend Big strong_rand(csprng *,const Big&);
friend Big strong_rand(csprng *,int,int);
friend Big abs(const Big&);
friend int bit(const Big& b,int i) {return mr_testbit(b.fn,i);}
friend int bits(const Big& b) {return logb2(b.fn);}
friend int jacobi(const Big& b1,const Big& b2) {return jack(b1.fn,b2.fn);}
friend int toint(const Big& b) {return size(b.fn);}
friend BOOL prime(const Big& b) {return isprime(b.fn);}
friend Big nextprime(const Big&);
friend Big nextsafeprime(int type,int subset,const Big&);
friend Big trial_divide(const Big& b);
friend BOOL small_factors(const Big& b);
friend BOOL perfect_power(const Big& b);
friend Big sqrt(const Big&,const Big&);
friend void ecurve(const Big&,const Big&,const Big&,int);
friend BOOL ecurve2(int,int,int,int,const Big&,const Big&,BOOL,int);
friend void modulo(const Big&);
friend BOOL modulo(int,int,int,int,BOOL);
friend Big get_modulus();
friend int window(const Big&,int,int*,int*);
friend int naf_window(const Big&,const Big&,int,int*,int*);
/* Montgomery stuff */
friend Big nres(const Big&);
friend Big redc(const Big&);
friend Big nres_negate(const Big&);
friend Big nres_modmult(const Big&,const Big&);
friend Big nres_premult(const Big&,int);
friend Big nres_pow(const Big&,const Big&);
friend Big nres_pow2(const Big&,const Big&,const Big&,const Big&);
friend Big nres_pown(int,Big *,Big *);
friend Big nres_luc(const Big&,const Big&,Big *b3=NULL);
friend Big nres_sqrt(const Big&);
friend Big nres_modadd(const Big&,const Big&);
friend Big nres_modsub(const Big&,const Big&);
friend Big nres_moddiv(const Big&,const Big&);
/* these are faster.... */
friend void nres_modmult(Big& a,const Big& b,Big& c)
{nres_modmult(a.fn,b.fn,c.fn);}
friend void nres_modadd(Big& a,const Big& b,Big& c)
{nres_modadd(a.fn,b.fn,c.fn);}
friend void nres_modsub(Big& a,const Big& b,Big& c)
{nres_modsub(a.fn,b.fn,c.fn);}
friend void nres_negate(Big& a,Big& b)
{nres_negate(a.fn,b.fn);}
friend void nres_premult(Big& a,int b,Big& c)
{nres_premult(a.fn,b,c.fn);}
friend void nres_moddiv(Big & a,const Big& b,Big& c)
{nres_moddiv(a.fn,b.fn,c.fn);}
/* GF(2) stuff */
friend Big reduce2(const Big&);
friend Big add2(const Big&,const Big&);
friend Big incr2(const Big&,int);
friend Big div2(const Big&,const Big&);
friend Big mul2(const Big&,const Big&);
friend Big pow2(const Big&,int);
friend Big sqrt2(const Big&);
friend void reduce2(const Big& a,Big& b)
{reduce2(a.fn,b.fn);}
friend void add2(Big& a,const Big& b,Big& c)
{add2(a.fn,b.fn,c.fn);}
friend void incr2(Big& a,int i,Big& c)
{incr2(a.fn,i,c.fn);}
friend void mul2(Big& a,const Big& b,Big& c)
{modmult2(a.fn,b.fn,c.fn);}
/* Note that when inputting text as a number the CR is NOT *
* included in the text, unlike C I/O which does include CR. */
#ifndef MR_NO_STANDARD_IO
friend istream& operator>>(istream&, Big&);
friend ostream& operator<<(ostream&, const Big&);
#endif
// output Big to a String
friend char * operator<<(char * s,const Big&);
#ifdef BIGS
~Big() { }
#else
~Big() { mirkill(fn); }
#endif
};
#endif