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DH_size(3)                          OpenSSL                         DH_size(3)



NAME
       DH_size, DH_bits, DH_security_bits - get Diffie-Hellman prime size and
       security bits

LIBRARY
       libcrypto, -lcrypto

SYNOPSIS
        #include <openssl/dh.h>

        int DH_size(const DH *dh);

        int DH_bits(const DH *dh);

        int DH_security_bits(const DH *dh);

DESCRIPTION
       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_bits() returns the number of significant bits.

       dh and dh->p must not be NULL.

       DH_security_bits() returns the number of security bits of the given dh
       key. See BN_security_bits(3).

RETURN VALUES
       DH_size() returns the prime size of Diffie-Hellman in bytes.

       DH_bits() returns the number of bits in the key.

       DH_security_bits() returns the number of security bits.

SEE ALSO
       DH_new(3), DH_generate_key(3), BN_num_bits(3)

HISTORY
       DH_bits() was added in OpenSSL 1.1.0.

COPYRIGHT
       Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (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>.



1.1.1                             2018-09-17                        DH_size(3)