testgmp.cpp

来自「伯克利做的SFTP安全文件传输协议」· C++ 代码 · 共 54 行

// testgmp.cpp
// stand-alone test of GMP; not very thorough, as it is really
// intended just to verify GMP is installed right.  more extensive
// tests are in selgamal.cpp and sdsa.cpp

#include "gmp.h"     // GMP functions
#include <stdio.h>   // printf

int main()
{
  printf("beginning of main\n");

  mpz_t x, y, z, zero;
  mpz_init(x);
  mpz_init(y);
  mpz_init(z);
  mpz_init(zero);

  mpz_add_ui(x, zero, 30);
  if (mpz_get_ui(x) != 30) {
    printf("mpz_add_ui or mpz_get_ui doesn't work\n");
    return 4;
  }

  mpz_add_ui(y, zero, 7);

  mpz_add(z, x, y);
  if (mpz_get_ui(z) != 37) {
    printf("mpz_add doesn't work\n");
    return 4;
  }

  if (mpz_invert(x, y, z)==0) {     // y = inverse of 7 (mod 37), should be 16
    printf("mpz_invert doesn't work (claims no inverse exists)\n");
    return 4;
  }
  unsigned ux = mpz_get_ui(x);
  printf("inverse of 7 (mod 37) is %u\n", ux);
  if (ux != 16) {
    printf("mpz_invert doesn't work\n");
    return 4;
  }

  mpz_clear(x);
  mpz_clear(y);
  mpz_clear(z);
  mpz_clear(zero);

  printf("end of main\n");
  return 0;
}