59 lines
1.3 KiB
C++
59 lines
1.3 KiB
C++
/*
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* Digital Signature Algorithm (DSA)
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*
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* See Communications ACM July 1992, Vol. 35 No. 7
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* This new standard for digital signatures has been proposed by
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* the American National Institute of Standards and Technology (NIST)
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* under advisement from the National Security Agency (NSA).
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*
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* This program generates one set of public and private keys in files
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* public.dss and private.dss respectively
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*
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* Requires: big.cpp
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*/
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#include <iostream>
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#include <fstream>
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#include "big.h"
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using namespace std;
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Miracl precision=100;
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int main()
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{
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ifstream common("common.dss"); /* construct file I/O streams */
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ofstream public_key("public.dss");
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ofstream private_key("private.dss");
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Big p,q,h,g,x,y,n,s,t;
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long seed;
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int bits;
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miracl *mip=&precision;
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cout << "Enter 9 digit random number seed = ";
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cin >> seed;
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irand(seed);
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/* get common data */
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common >> bits;
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mip->IOBASE=16;
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common >> p >> q >> g;
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mip->IOBASE=10;
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y=pow(g,q,p);
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if (y!=1)
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{
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cout << "Problem - generator g is not of order q" << endl;
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exit(0);
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}
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/* generate public/private keys */
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x=rand(q);
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y=pow(g,x,p);
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cout << "public key = " << y << endl;
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public_key << y << endl;
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private_key << x << endl;
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return 0;
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}
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