OpenSSL

Cryptography and SSL/TLS Toolkit

DH_size

NAME

DH_size, DH_bits - get Diffie-Hellman prime size

SYNOPSIS

#include <openssl/dh.h>

int DH_size(const DH *dh);

int DH_bits(const DH *dh);

DESCRIPTION

DH_size() returns the Diffie-Hellman prime 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_bits() returns the number of significant bits.

dh and dh->p must not be NULL.

RETURN VALUE

The size.

SEE ALSO

dh, DH_generate_key, BN_num_bits

HISTORY

DH_bits() was added in OpenSSL 1.1.0.

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.