DH_size, DH_bits, DH_security_bits - get Diffie-Hellman prime size and security bits
#include <openssl/dh.h>
int DH_bits(const DH *dh);Deprecated since OpenSSL 3.0, can be hidden entirely by defining OPENSSL_API_COMPAT with a suitable version value, see openssl_user_macros(7):
int DH_size(const DH *dh);
int DH_security_bits(const DH *dh);DH_bits() returns the number of significant bits.
dh and dh->p must not be NULL.
The remaining functions described on this page are deprecated. Applications should instead use EVP_PKEY_security_bits(3) and EVP_PKEY_size(3).
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_security_bits() returns the number of security bits of the given dh key. See BN_security_bits(3).
DH_bits() returns the number of bits in the key, or -1 if dh doesn't hold any key parameters.
DH_size() returns the prime size of Diffie-Hellman in bytes, or -1 if dh doesn't hold any key parameters.
DH_security_bits() returns the number of security bits, or -1 if dh doesn't hold any key parameters.
EVP_PKEY_bits(3), DH_new(3), DH_generate_key(3), BN_num_bits(3)
The DH_size() and DH_security_bits() functions were deprecated in OpenSSL 3.0.
The DH_bits() function was added in OpenSSL 1.1.0.
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Licensed under the Apache License 2.0 (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.