73 lines
1.5 KiB
C
73 lines
1.5 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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*/
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#include <stdio.h>
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#include "miracl.h"
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int main()
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{
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FILE *fp;
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big p,q,g,x,y;
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long seed;
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int bits;
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miracl *mip;
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/* get common data */
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fp=fopen("common.dss","rt");
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if (fp==NULL)
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{
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printf("file common.dss does not exist\n");
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return 0;
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}
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fscanf(fp,"%d\n",&bits);
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mip=mirsys(bits/4,16); /* use Hex internally */
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p=mirvar(0);
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q=mirvar(0);
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g=mirvar(0);
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x=mirvar(0);
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y=mirvar(0);
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innum(p,fp);
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innum(q,fp);
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innum(g,fp);
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fclose(fp);
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/* randomise */
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printf("Enter 9 digit random number seed = ");
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scanf("%ld",&seed);
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getchar();
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irand(seed);
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powmod(g,q,p,y);
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if (size(y)!=1)
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{
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printf("Problem - generator g is not of order q\n");
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return 0;
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}
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/* generate public/private keys */
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bigrand(q,x);
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powmod(g,x,p,y);
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printf("public key = ");
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otnum(y,stdout);
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fp=fopen("public.dss","wt");
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otnum(y,fp);
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fclose(fp);
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fp=fopen("private.dss","wt");
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otnum(x,fp);
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fclose(fp);
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mirexit();
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return 0;
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}
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