5 DH_size, DH_bits, DH_security_bits - get Diffie-Hellman prime size and
10 #include <openssl/dh.h>
12 Deprecated since OpenSSL 3.0, can be hidden entirely by defining
13 B<OPENSSL_API_COMPAT> with a suitable version value, see
14 L<openssl_user_macros(7)>:
16 int DH_size(const DH *dh);
18 int DH_bits(const DH *dh);
20 int DH_security_bits(const DH *dh);
24 All of the functions described on this page are deprecated.
25 Applications should instead use L<EVP_PKEY_bits(3)>,
26 L<EVP_PKEY_security_bits(3)> and L<EVP_PKEY_size(3)>.
28 DH_size() returns the Diffie-Hellman prime size in bytes. It can be used
29 to determine how much memory must be allocated for the shared secret
30 computed by L<DH_compute_key(3)>.
32 DH_bits() returns the number of significant bits.
34 B<dh> and B<dh-E<gt>p> must not be B<NULL>.
36 DH_security_bits() returns the number of security bits of the given B<dh>
37 key. See L<BN_security_bits(3)>.
41 DH_size() returns the prime size of Diffie-Hellman in bytes.
43 DH_bits() returns the number of bits in the key.
45 DH_security_bits() returns the number of security bits.
50 L<DH_new(3)>, L<DH_generate_key(3)>,
55 All of these functions were deprecated in OpenSSL 3.0.
57 The DH_bits() function was added in OpenSSL 1.1.0.
61 Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
63 Licensed under the Apache License 2.0 (the "License"). You may not use
64 this file except in compliance with the License. You can obtain a copy
65 in the file LICENSE in the source distribution or at
66 L<https://www.openssl.org/source/license.html>.