SEI CERT C Coding Standard

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Old Version 80

changes.mady.by.user Carol J. Lallier

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New Version 81

changes.mady.by.user Aaron Ballman

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Comment: Type punning is not required because BYTE * is an unsigned char *, so aliasing is well-defined.

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Code Block
bgColor#ccccff
langc
#include<Wincrypt.h>

HCRYPTPROV hCryptProv;
union {
    BYTE bs[sizeof(long int)];
    long int li;
} rand_buf;

if (!CryptGenRandom(hCryptProv, sizeof(rand_buf&li), &rand_bufli) {
    /* Handle error */
} else {
    printf("Random number: %ld\n", rand_buf.li);
}

Risk Assessment

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

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