DH_size, DH_bits, DH_security_bits - get Diffie-Hellman prime size and security
bits
#include <openssl/dh.h>
The following functions have been deprecated since OpenSSL 3.0, and can be
hidden entirely by defining
OPENSSL_API_COMPAT with a suitable version
value, see
openssl_user_macros(7):
int DH_bits(const DH *dh);
int DH_size(const DH *dh);
int DH_security_bits(const DH *dh);
The functions described on this page are deprecated. Applications should instead
use
EVP_PKEY_get_bits(3),
EVP_PKEY_get_security_bits(3) and
EVP_PKEY_get_size(3).
DH_bits() returns the number of significant bits.
dh and
dh->p must not be
NULL.
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(3).
DH_security_bits() returns the number of security bits of the given
dh key. See
BN_security_bits(3).
DH_bits() returns the number of bits in the key, or -1 if
dh
doesn't hold any key parameters.
DH_size() returns the prime size of Diffie-Hellman in bytes, or -1 if
dh doesn't hold any key parameters.
DH_security_bits() returns the number of security bits, or -1 if
dh doesn't hold any key parameters.
EVP_PKEY_get_bits(3),
DH_new(3),
DH_generate_key(3),
BN_num_bits(3)
All functions were deprecated in OpenSSL 3.0.
Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (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>.