RAND_BYTES(3) Library Functions Manual RAND_BYTES(3)

RAND_bytes, RAND_pseudo_bytesgenerate random data

#include <openssl/rand.h>

RAND_bytes(unsigned char *buf, int num);

RAND_pseudo_bytes(unsigned char *buf, int num);

These functions are deprecated and only retained for compatibility with legacy application programs. Use arc4random_buf(3) instead.

() puts num cryptographically strong pseudo-random bytes into buf.

() puts num pseudo-random bytes into buf. Pseudo-random byte sequences generated by RAND_pseudo_bytes() will be unique if they are of sufficient length, but are not necessarily unpredictable. They can be used for non-cryptographic purposes and for certain purposes in cryptographic protocols, but usually not for key generation etc.

RAND_bytes() returns 1. RAND_pseudo_bytes() returns 1.

RAND_bytes() first appeared in SSLeay 0.5.1 and has been available since OpenBSD 2.4. It has a return value since OpenSSL 0.9.5 and OpenBSD 2.7.

RAND_pseudo_bytes() first appeared in OpenSSL 0.9.5 and has been available since OpenBSD 2.7.

March 27, 2018 OpenBSD 7.5