DH_GENERATE_KEY(3) OpenSSL DH_GENERATE_KEY(3)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);
DESCRIPTIONDH_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 parame-
ters 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 VALUESDH_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 ALSOdh(3), ERR_get_error(3), rand(3), DH_size(3)HISTORYDH_generate_key() and DH_compute_key() are available in all
versions of SSLeay and OpenSSL.
MirOS BSD #10-current 2005-02-05 1