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=pod
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=head1 NAME
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2017-08-09 23:25:19 +08:00
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DH_size, DH_bits, DH_security_bits - get Diffie-Hellman prime size and
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security bits
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2000-01-23 04:05:23 +08:00
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=head1 SYNOPSIS
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2017-08-09 23:25:19 +08:00
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#include <openssl/dh.h>
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2017-08-09 23:25:19 +08:00
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int DH_size(const DH *dh);
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2015-04-18 18:23:12 +08:00
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2017-08-09 23:25:19 +08:00
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int DH_bits(const DH *dh);
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int DH_security_bits(const DH *dh);
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=head1 DESCRIPTION
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2015-04-18 18:23:12 +08:00
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DH_size() returns the Diffie-Hellman prime size in bytes. It can be used
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to determine how much memory must be allocated for the shared secret
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computed by L<DH_compute_key(3)>.
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2000-01-23 04:05:23 +08:00
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2015-04-18 18:23:12 +08:00
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DH_bits() returns the number of significant bits.
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B<dh> and B<dh-E<gt>p> must not be B<NULL>.
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2000-01-23 04:05:23 +08:00
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2017-08-09 23:25:19 +08:00
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DH_security_bits() returns the number of security bits of the given B<dh>
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key. See L<BN_security_bits(3)>.
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2017-12-25 17:50:39 +08:00
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=head1 RETURN VALUES
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2017-08-09 23:25:19 +08:00
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DH_size() returns the prime size of Diffie-Hellman in bytes.
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DH_bits() returns the number of bits in the key.
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DH_security_bits() returns the number of security bits.
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2000-01-23 04:05:23 +08:00
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=head1 SEE ALSO
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2016-11-11 16:33:09 +08:00
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L<DH_new(3)>, L<DH_generate_key(3)>,
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2015-08-18 03:21:33 +08:00
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L<BN_num_bits(3)>
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=head1 HISTORY
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2015-04-18 18:23:12 +08:00
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DH_bits() was added in OpenSSL 1.1.0.
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2016-05-18 23:44:05 +08:00
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=head1 COPYRIGHT
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2018-01-16 01:01:46 +08:00
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Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
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2016-05-18 23:44:05 +08:00
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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