Курсовая работа: Программирование алгоритма цифровой подписи ГОСТ Р 34.10-94

if(fp1==NULL) printf("Error: couldn't open file");

if(rs==0) fprintf(fp1, "Verification successful: u=r', signature is authentic\n");

else fprintf(fp1, "WARNING: verification unsuccessful: u!=r', signature is non-authentic\n");

printf("Operations complete. Result of operation writed to \"verification result.txt\"\n");

fclose(fp1);

break;

case 2:

signature(p,a,q,x,m,k,sign);

file_write(sign, 0, S);

printf("Operation complete. Result of operation writed to \"signature.txt\"\n");

break;

case 3:

verify(p,a,q,y,m,sign);

rs=verify(p,a,q,y,m,sign);

if(rs==0) fprintf(fp1, "Verification successful: u=r', signature is authentic\n");

else fprintf(fp1, "WARNING: verification unsuccessful: u!=r', signature is non-authentic\n");

printf("Operation complete. Result of operation writed to \"verification result.txt\"\n");

break;

default: printf("Wrong number. Try again\n"); break;}}

while(1);}

Function.cpp

#include "function.h"

#include "INTERFS.h"

void signature(unsigned short sign_p[], unsigned short sign_a[], unsigned short sign_q[], unsigned short sign_x[], unsigned short sign_m[], unsigned short sign_k[], unsigned short sign[])

{unsigned short w[S*2];

unsigned short res[S];

unsigned short result[S];

unsigned short tmp[S/2];

unsigned short tmp1[S/2];