RAND_BYTES(3)              Library Functions Manual              RAND_BYTES(3)

NAME
     RAND_bytes, RAND_pseudo_bytes - generate random data

SYNOPSIS
     #include <openssl/rand.h>

     int
     RAND_bytes(unsigned char *buf, int num);

     int
     RAND_pseudo_bytes(unsigned char *buf, int num);

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

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

     RAND_pseudo_bytes() 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.

RETURN VALUES
     RAND_bytes() returns 1.  RAND_pseudo_bytes() returns 1.

HISTORY
     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.

Linux 6.8.7-arch1-1             March 27, 2018             Linux 6.8.7-arch1-1