1DH_SIZE(3ossl)                      OpenSSL                     DH_SIZE(3ossl)
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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       The following functions have been deprecated since OpenSSL 3.0, and can
13       be hidden entirely by defining OPENSSL_API_COMPAT with a suitable
14       version value, see openssl_user_macros(7):
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16        int DH_bits(const DH *dh);
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18        int DH_size(const DH *dh);
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20        int DH_security_bits(const DH *dh);
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DESCRIPTION

23       The functions described on this page are deprecated.  Applications
24       should instead use EVP_PKEY_get_bits(3), EVP_PKEY_get_security_bits(3)
25       and EVP_PKEY_get_size(3).
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27       DH_bits() returns the number of significant bits.
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29       dh and dh->p must not be NULL.
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31       DH_size() returns the Diffie-Hellman prime size in bytes. It can be
32       used to determine how much memory must be allocated for the shared
33       secret computed by DH_compute_key(3).
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35       DH_security_bits() returns the number of security bits of the given dh
36       key. See BN_security_bits(3).
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RETURN VALUES

39       DH_bits() returns the number of bits in the key, or -1 if dh doesn't
40       hold any key parameters.
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42       DH_size() returns the prime size of Diffie-Hellman in bytes, or -1 if
43       dh doesn't hold any key parameters.
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45       DH_security_bits() returns the number of security bits, or -1 if dh
46       doesn't hold any key parameters.
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SEE ALSO

49       EVP_PKEY_get_bits(3), DH_new(3), DH_generate_key(3), BN_num_bits(3)
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HISTORY

52       All functions were deprecated in OpenSSL 3.0.
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55       Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
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57       Licensed under the Apache License 2.0 (the "License").  You may not use
58       this file except in compliance with the License.  You can obtain a copy
59       in the file LICENSE in the source distribution or at
60       <https://www.openssl.org/source/license.html>.
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643.1.1                             2023-08-31                    DH_SIZE(3ossl)
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