DH_SIZE(3ossl) OpenSSL DH_SIZE(3ossl)
NAME
DH_size, DH_bits, DH_security_bits - get Diffie-Hellman prime size and
security bits
SYNOPSIS
#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);
DESCRIPTION
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(3) 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).
RETURN VALUES
DH_bits() returns the number of bits in the key, or -1 if dh doesn't
hold any key parameters.
DH_size(3) 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.
SEE ALSO
EVP_PKEY_get_bits(3), DH_new(3), DH_generate_key(3), BN_num_bits(3)
HISTORY
All functions were deprecated in OpenSSL 3.0.
COPYRIGHT
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>.
3.3.2 2024-09-04 DH_SIZE(3ossl)
openssl 3.3.2 - Generated Sun Sep 8 16:01:40 CDT 2024