RAND_cleanup(3) OpenSSL RAND_cleanup(3)NAME
RAND_cleanup - erase the PRNG state
LIBRARY
libcrypto, -lcrypto
SYNOPSIS
#include <openssl/rand.h>
void RAND_cleanup(void);
DESCRIPTION
RAND_cleanup() erases the memory used by the PRNG.
RETURN VALUE
RAND_cleanup() returns no value.
SEE ALSO openssl_rand(3)HISTORY
RAND_cleanup() is available in all versions of SSLeay and OpenSSL.
1.0.1i 2009-07-20 RAND_cleanup(3)
Check Out this Related Man Page
RAND_add(3) OpenSSL RAND_add(3)NAME
RAND_add, RAND_seed, RAND_status, RAND_event, RAND_screen - add entropy to the PRNG
LIBRARY
libcrypto, -lcrypto
SYNOPSIS
#include <openssl/rand.h>
void RAND_seed(const void *buf, int num);
void RAND_add(const void *buf, int num, double entropy);
int RAND_status(void);
int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam);
void RAND_screen(void);
DESCRIPTION
RAND_add() mixes the num bytes at buf into the PRNG state. Thus, if the data at buf are unpredictable to an adversary, this increases the
uncertainty about the state and makes the PRNG output less predictable. Suitable input comes from user interaction (random key presses,
mouse movements) and certain hardware events. The entropy argument is (the lower bound of) an estimate of how much randomness is contained
in buf, measured in bytes. Details about sources of randomness and how to estimate their entropy can be found in the literature, e.g. RFC
1750.
RAND_add() may be called with sensitive data such as user entered passwords. The seed values cannot be recovered from the PRNG output.
OpenSSL makes sure that the PRNG state is unique for each thread. On systems that provide "/dev/urandom", the randomness device is used to
seed the PRNG transparently. However, on all other systems, the application is responsible for seeding the PRNG by calling RAND_add(),
RAND_egd(3) or RAND_load_file(3).
RAND_seed() is equivalent to RAND_add() when num == entropy.
RAND_event() collects the entropy from Windows events such as mouse movements and other user interaction. It should be called with the
iMsg, wParam and lParam arguments of all messages sent to the window procedure. It will estimate the entropy contained in the event message
(if any), and add it to the PRNG. The program can then process the messages as usual.
The RAND_screen() function is available for the convenience of Windows programmers. It adds the current contents of the screen to the PRNG.
For applications that can catch Windows events, seeding the PRNG by calling RAND_event() is a significantly better source of randomness. It
should be noted that both methods cannot be used on servers that run without user interaction.
RETURN VALUES
RAND_status() and RAND_event() return 1 if the PRNG has been seeded with enough data, 0 otherwise.
The other functions do not return values.
SEE ALSO openssl_rand(3), RAND_egd(3), RAND_load_file(3), RAND_cleanup(3)HISTORY
RAND_seed() and RAND_screen() are available in all versions of SSLeay and OpenSSL. RAND_add() and RAND_status() have been added in OpenSSL
0.9.5, RAND_event() in OpenSSL 0.9.5a.
1.0.1i 2009-07-20 RAND_add(3)
Introduction
I have seen some misinformation regarding Unix file permissions. I will try to set the record straight. Take a look at this example of some output from ls:
$ ls -ld /usr/bin /usr/bin/cat
drwxrwxr-x 3 root bin 8704 Sep 23 2004 /usr/bin
-r-xr-xr-x 1 bin bin ... (6 Replies)
I have a file which looks roughly like this:
996 mmmmmmm
996 xxxxxxxxxxxxx
99600 ssssssssss
9964 fffffffffffff
and would like to sort it numerically on the first field. I tried:
sort -nr --key=1 ....
The output I get is:
99600 ssssssssss
9964 ... (3 Replies)
Suppose I have a main() function with only one malloc statement allocating say some 1 gb memory. Also say my system has 1 gb of ram.
main()
{
malloc(1gb)
return(0)
}
The program above exits without freeing the memory.
In this case will the 1 gb of heap memory be returned... (9 Replies)
I'm trying to install a PGX32 video card on my Sparc 10 Ultra running Solaris 10.
I've got the Oracle installation guide for it and I got as far as:
"4. Insert the CD-ROM labeled “GFX OpenWindows for Solaris 2” into the drive."
I don't have a CD-ROM by that name and a web search for that... (21 Replies)
Hey All,
Quick question...
I'm writing a short script to check if a continuous port is running on a server.
I'm using "ps -ef | grep -v grep | grep processName" and I was wondering if it was better/more reliable to just check the
return code from the command or if its better to pipe to... (12 Replies)
I installed NetBSD 6.1.2 amd64 and can't find the apm utility. Is it not in the base system?
Is it necessary to recompile the default amd64 kernel to use apm?
Or is there a new method for power management and suspend/resume? (2 Replies)
Hi,
I am learning shell scripting for the first time. I use AT&T Korn Shell, Version AJM 93u+ 2012-08-01, compiled from source on NetBSD.
So far I have managed to set up what I think is a useful and pleasing shell prompt, which can be seen in the image attached to this post.
The prompt is... (2 Replies)
Hey gang, I have a list of times I need to sum up. This list can vary from a few to a few thousand entries. Now I had found a closed reference to adding time titled "add up time with xx:yy format in bash how?" In it, the example works great for that formatted list of times... This is the reply code... (5 Replies)
Usually when I on the evening go to bed I take some interesting book with me. I read it for a while to get me down to sleep. Probably most people seek information from the Nett by googleing but I am so oldfashioned I prefer a real book ;)
But what a book. The one I found and ordered is BSD Unix®... (0 Replies)
On the late 1960s I got short hands on experience with a russian "small" computer. It vas a copy of DEC's VAX ... and running some version of BSD-Unix. After that I worked in a university following the development of computing. After retire I started collecting old pc's and installing... (13 Replies)