BN_rand(3) OpenSSL BN_rand(3)NAME
BN_rand, BN_pseudo_rand - generate pseudo-random number
SYNOPSIS
#include <openssl/bn.h>
int BN_rand(BIGNUM *rnd, int bits, int top, int bottom);
int BN_pseudo_rand(BIGNUM *rnd, int bits, int top, int bottom);
DESCRIPTIONBN_rand() generates a cryptographically strong pseudo-
random number of bits bits in length and stores it in rnd.
If top is true, the two most significant bits of the
number will be set to 1, so that the product of two such
random numbers will always have 2*bits length. If bottom
is true, the number will be odd.
BN_pseudo_rand() does the same, but pseudo-random numbers
generated by this function 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.
The PRNG must be seeded prior to calling BN_rand().
RETURN VALUESBN_rand() and BN_pseudo_rand() return 1 on success, 0 on
error. The error codes can be obtained by
ERR_get_error(3).
SEE ALSObn(3), err(3), rand(3), RAND_add(3), RAND_bytes(3)HISTORYBN_rand() is available in all versions of SSLeay and
OpenSSL. BN_pseudo_rand() was added in OpenSSL 0.9.5.
16/Aug/2000 0.9.6 1