DH_generate_key, DH_compute_key - perform Diffie-Hellman key exchange
#include <openssl/dh.h>
int DH_generate_key(DH *dh);
int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
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.
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).
DH_new(3), ERR_get_error(3), RAND_bytes(3), DH_size(3)
Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at https://www.openssl.org/source/license.html.