SEI CERT C Coding Standard

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Old Version 82

changes.mady.by.user Carol J. Lallier

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New Version 83

changes.mady.by.user Aaron Ballman

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Comment: Updated the Windows code example to show how to acquire the crypto context; fixed a compile error

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Code Block
bgColor#ccccff
langc
#include<Wincrypt#include <Windows.h>
#include <wincrypt.h>
#include <stdio.h>
 
HCRYPTPROV hCryptProv;
prov;
if (CryptAcquireContext(&prov, NULL, NULL, PROV_RSA_FULL, 0)) {
  long int li = 0;

  if (!CryptGenRandom(hCryptProvprov, sizeof(&li), (BYTE *)&li)) {
    /* Handle error */
} else {
    printf("Random number: %ld\n", li);
  CryptReleaseContext(prov, 0);
}

Risk Assessment

Using the rand() function leads to possibly predictable random numbers.

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