HP-UX configuration gathering tool

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rand_egd

RAND_egd(3)							      OpenSSL							       RAND_egd(3)

NAME

       RAND_egd - query entropy gathering daemon

SYNOPSIS

	#include <openssl/rand.h>

	int RAND_egd(const char *path);
	int RAND_egd_bytes(const char *path, int bytes);

	int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes);

DESCRIPTION

       RAND_egd() queries the entropy gathering daemon EGD on socket path.  It queries 255 bytes and uses RAND_add(3) to seed the OpenSSL built-in
       PRNG. RAND_egd(path) is a wrapper for RAND_egd_bytes(path, 255);

       RAND_egd_bytes() queries the entropy gathering daemon EGD on socket path.  It queries bytes bytes and uses RAND_add(3) to seed the OpenSSL
       built-in PRNG.  This function is more flexible than RAND_egd().	When only one secret key must be generated, it is not necessary to request
       the full amount 255 bytes from the EGD socket. This can be advantageous, since the amount of entropy that can be retrieved from EGD over
       time is limited.

       RAND_query_egd_bytes() performs the actual query of the EGD daemon on socket path. If buf is given, bytes bytes are queried and written
       into buf. If buf is NULL, bytes bytes are queried and used to seed the OpenSSL built-in PRNG using RAND_add(3).

NOTES

       On systems without /dev/*random devices providing entropy from the kernel, the EGD entropy gathering daemon can be used to collect entropy.
       It provides a socket interface through which entropy can be gathered in chunks up to 255 bytes. Several chunks can be queried during one
       connection.

       EGD is available from http://www.lothar.com/tech/crypto/ ("perl Makefile.PL; make; make install" to install). It is run as egd path, where
       path is an absolute path designating a socket. When RAND_egd() is called with that path as an argument, it tries to read random bytes that
       EGD has collected. The read is performed in non-blocking mode.

       Alternatively, the EGD-interface compatible daemon PRNGD can be used. It is available from http://www.aet.tu-cottbus.de/perso-
       nen/jaenicke/postfix_tls/prngd.html .  PRNGD does employ an internal PRNG itself and can therefore never run out of entropy.

       OpenSSL automatically queries EGD when entropy is requested via RAND_bytes() or the status is checked via RAND_status() for the first time,
       if the socket is located at /var/run/egd-pool, /dev/egd-pool or /etc/egd-pool.

RETURN VALUE

       RAND_egd() and RAND_egd_bytes() return the number of bytes read from the daemon on success, and -1 if the connection failed or the daemon
       did not return enough data to fully seed the PRNG.

       RAND_query_egd_bytes() returns the number of bytes read from the daemon on success, and -1 if the connection failed. The PRNG state is not
       considered.

SEE ALSO

       rand(3), RAND_add(3), RAND_cleanup(3)

HISTORY

       RAND_egd() is available since OpenSSL 0.9.5.

       RAND_egd_bytes() is available since OpenSSL 0.9.6.

       RAND_query_egd_bytes() is available since OpenSSL 0.9.7.

       The automatic query of /var/run/egd-pool et al was added in OpenSSL 0.9.7.

0.9.7d								    2003-11-20							       RAND_egd(3)

HP-UX