1DH_SIZE(3)                          OpenSSL                         DH_SIZE(3)
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NAME

6       DH_size, DH_bits, DH_security_bits - get Diffie-Hellman prime size and
7       security bits
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SYNOPSIS

10        #include <openssl/dh.h>
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12        int DH_size(const DH *dh);
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14        int DH_bits(const DH *dh);
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16        int DH_security_bits(const DH *dh);
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DESCRIPTION

19       DH_size() returns the Diffie-Hellman prime size in bytes. It can be
20       used to determine how much memory must be allocated for the shared
21       secret computed by DH_compute_key(3).
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23       DH_bits() returns the number of significant bits.
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25       dh and dh->p must not be NULL.
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27       DH_security_bits() returns the number of security bits of the given dh
28       key. See BN_security_bits(3).
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RETURN VALUES

31       DH_size() returns the prime size of Diffie-Hellman in bytes.
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33       DH_bits() returns the number of bits in the key.
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35       DH_security_bits() returns the number of security bits.
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SEE ALSO

38       DH_new(3), DH_generate_key(3), BN_num_bits(3)
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HISTORY

41       The DH_bits() function was added in OpenSSL 1.1.0.
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44       Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
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46       Licensed under the OpenSSL license (the "License").  You may not use
47       this file except in compliance with the License.  You can obtain a copy
48       in the file LICENSE in the source distribution or at
49       <https://www.openssl.org/source/license.html>.
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531.1.1i                            2021-01-26                        DH_SIZE(3)
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