DH_size(3SSL) OpenSSL DH_size(3SSL)NAME
DH_size - get Diffie-Hellman prime size
SYNOPSIS
#include <openssl/dh.h>
int DH_size(DH *dh);
DESCRIPTION
This function returns the Diffie-Hellman size in bytes. It can be used to determine how much memory must be allocated for the shared secret
computed by DH_compute_key().
dh->p must not be NULL.
RETURN VALUE
The size in bytes.
SEE ALSO dh(3), DH_generate_key(3)HISTORY
DH_size() is available in all versions of SSLeay and OpenSSL.
1.0.1e 2013-02-11 DH_size(3SSL)
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DH_generate_key(3SSL) OpenSSL DH_generate_key(3SSL)NAME
DH_generate_key, DH_compute_key - perform Diffie-Hellman key exchange
SYNOPSIS
#include <openssl/dh.h>
int DH_generate_key(DH *dh);
int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
DESCRIPTION
DH_generate_key() performs the first step of a Diffie-Hellman key exchange by generating private and public DH values. By calling
DH_compute_key(), these are combined with the other party's public value to compute the shared key.
DH_generate_key() expects dh to contain the shared parameters dh->p and dh->g. It generates a random private DH value unless dh->priv_key
is already set, and computes the corresponding public value dh->pub_key, which can then be published.
DH_compute_key() computes the shared secret from the private DH value in dh and the other party's public value in pub_key and stores it in
key. key must point to DH_size(dh) bytes of memory.
RETURN VALUES
DH_generate_key() returns 1 on success, 0 otherwise.
DH_compute_key() returns the size of the shared secret on success, -1 on error.
The error codes can be obtained by ERR_get_error(3).
SEE ALSO dh(3), ERR_get_error(3), rand(3), DH_size(3)HISTORY
DH_generate_key() and DH_compute_key() are available in all versions of SSLeay and OpenSSL.
1.0.1e 2013-02-11 DH_generate_key(3SSL)
Why do shell builtins like echo and pwd have binaries in /bin? When I do which pwd, I get the one in /bin. that means that I am not using the builtin version? What determines which one gets used? Is the which command a definitive way to determine what is being run when I enter pwd? (16 Replies)
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 see lot of ad-hoc shell scripts in our servers which don't have a shebang at the beginning .
Does this mean that it will run on any shell ?
Is it a good practice to create scripts (even ad-hoc ones) without shebang ? (16 Replies)
For a starter I know the braces are NOT in the code...
Consider these code snippets:-
#!/bin/bash --posix
x=0
somefunction()
if
then
echo "I am here."
fi
# somefunction
#!/bin/bash --posix
x=0
somefunction()
if (2 Replies)
Hi everyone,
I know the following questions are noobish questions but I am asking them because I am confused about the basics of history behind UNIX and LINUX.
Ok onto business, my questions are-:
Was/Is UNIX ever an open source operating system ?
If UNIX was... (21 Replies)
For those interested in installing dash shell on OSX Lion to help test POSIX compliancy of shell scripts, it is quite easy. I did it like this:
If you don't have gcc on your system:
0. Download and install the Command Line Tools for Xcode package from Sign In - Apple *
1. Download the dash... (2 Replies)
Hi all,
I am learning POSIX shell programming, and the book I read, uses the let command for integer arithmetic.
I have downloaded and use the shellcheck program on Linux.
This programs says:
In POSIX sh, 'let' is undefined.
See the screenshot attached.
What is the POSIX... (1 Reply)
I don't know how to start this but here goes.
I've been "using" Linux for over 10 years, possibly more and I still feel like I'm nowhere
where I should be. I'll be fair most of my time was spent either figuring out how
to run games on *nix at the time but as I got older and "wiser" I... (8 Replies)
In a professional environment with traditional application you often want (or are asked) to report the users.
Traditionally there is the who command
who | awk '{print $1}'telnetd or sshd register the users in the utmp file, to be shown with who, w, users, finger, pinky, ...
In addition they... (1 Reply)
Hi all, (mainly Neo)...
I keep noticing that the SQRT code I wrote recently for a POSIX shell keeps appearing, (the green colour sticks out like a sore thumb).
So I decided to take a look on Google.
Guess what?
UNIX.COM comes first in Google's listing just from two words, see image... (2 Replies)