1=pod 2 3=head1 NAME 4 5DH_size, DH_bits, DH_security_bits - get Diffie-Hellman prime size and 6security bits 7 8=head1 SYNOPSIS 9 10 #include <openssl/dh.h> 11 12 int DH_size(const DH *dh); 13 14 int DH_bits(const DH *dh); 15 16 int DH_security_bits(const DH *dh); 17 18=head1 DESCRIPTION 19 20DH_size() returns the Diffie-Hellman prime size in bytes. It can be used 21to determine how much memory must be allocated for the shared secret 22computed by L<DH_compute_key(3)>. 23 24DH_bits() returns the number of significant bits. 25 26B<dh> and B<dh-E<gt>p> must not be B<NULL>. 27 28DH_security_bits() returns the number of security bits of the given B<dh> 29key. See L<BN_security_bits(3)>. 30 31=head1 RETURN VALUES 32 33DH_size() returns the prime size of Diffie-Hellman in bytes. 34 35DH_bits() returns the number of bits in the key. 36 37DH_security_bits() returns the number of security bits. 38 39=head1 SEE ALSO 40 41L<DH_new(3)>, L<DH_generate_key(3)>, 42L<BN_num_bits(3)> 43 44=head1 HISTORY 45 46The DH_bits() function was added in OpenSSL 1.1.0. 47 48=head1 COPYRIGHT 49 50Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved. 51 52Licensed under the OpenSSL license (the "License"). You may not use 53this file except in compliance with the License. You can obtain a copy 54in the file LICENSE in the source distribution or at 55L<https://www.openssl.org/source/license.html>. 56 57=cut 58