openssl_rand(1) [netbsd man page]

RAND(1) 							      OpenSSL								   RAND(1)

NAME

       rand - generate pseudo-random bytes

LIBRARY

       libcrypto, -lcrypto

SYNOPSIS

       openssl rand [-out file] [-rand file(s)] [-base64] [-hex] num

DESCRIPTION

       The rand command outputs num pseudo-random bytes after seeding the random number generator once.  As in other openssl command line tools,
       PRNG seeding uses the file $HOME/.rnd or .rnd in addition to the files given in the -rand option.  A new $HOME/.rnd or .rnd file will be
       written back if enough seeding was obtained from these sources.

OPTIONS

       -out file
	   Write to file instead of standard output.

       -rand file(s)
	   Use specified file or files or EGD socket (see RAND_egd(3)) for seeding the random number generator.  Multiple files can be specified
	   separated by a OS-dependent character.  The separator is ; for MS-Windows, , for OpenVMS, and : for all others.

       -base64
	   Perform base64 encoding on the output.

       -hex
	   Show the output as a hex string.

SEE ALSO

       RAND_bytes(3)

1.0.1i								    2009-07-20								   RAND(1)

RAND_bytes(3)							      OpenSSL							     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

       RAND_bytes() puts num cryptographically strong pseudo-random bytes into buf. An error occurs if the PRNG has not been seeded with enough
       randomness to ensure an unpredictable byte sequence.

       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 pur-
       poses in cryptographic protocols, but usually not for key generation etc.

RETURN VALUES

       RAND_bytes() returns 1 on success, 0 otherwise. The error code can be obtained by ERR_get_error(3). RAND_pseudo_bytes() returns 1 if the
       bytes generated are cryptographically strong, 0 otherwise. Both functions return -1 if they are not supported by the current RAND method.

SEE ALSO

       rand(3), ERR_get_error(3), RAND_add(3)

HISTORY

       RAND_bytes() is available in all versions of SSLeay and OpenSSL.  It has a return value since OpenSSL 0.9.5. RAND_pseudo_bytes() was added
       in OpenSSL 0.9.5.

0.9.7a								    2002-09-25							     RAND_bytes(3)