Method getSeed

Timer.cpp:65–134

}

std::string Timer::getSeed(int size) {

  std::string ret;
  char tmp[3];
  unsigned char *buff = (unsigned char *)malloc(size);

#ifdef WIN64

  HCRYPTPROV   hCryptProv = NULL;
  LPCSTR UserName = "KeyContainer";

  if (!CryptAcquireContext(
    &hCryptProv,               // handle to the CSP
    UserName,                  // container name
    NULL,                      // use the default provider
    PROV_RSA_FULL,             // provider type
    0))                        // flag values
  {
    //-------------------------------------------------------------------
    // An error occurred in acquiring the context. This could mean
    // that the key container requested does not exist. In this case,
    // the function can be called again to attempt to create a new key
    // container. Error codes are defined in Winerror.h.
    if (GetLastError() == NTE_BAD_KEYSET) {
      if (!CryptAcquireContext(
        &hCryptProv,
        UserName,
        NULL,
        PROV_RSA_FULL,
        CRYPT_NEWKEYSET)) {
        printf("CryptAcquireContext(): Could not create a new key container.\n");
        exit(1);
      }
    } else {
      printf("CryptAcquireContext(): A cryptographic service handle could not be acquired.\n");
      exit(1);
    }
  }

  if (!CryptGenRandom(hCryptProv,size,buff)) {
    printf("CryptGenRandom(): Error during random sequence acquisition.\n");
    exit(1);
  }

  CryptReleaseContext(hCryptProv, 0);

#else

  FILE *f = fopen("/dev/urandom","rb");
  if(f==NULL) {
    printf("Failed to open /dev/urandom %s\n", strerror( errno ));
    exit(1);
  }
  if( fread(buff,1,size,f)!=size ) {
    printf("Failed to read from /dev/urandom %s\n", strerror( errno ));
    exit(1);
  }
  fclose(f);