DH_size.3ssl man page

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

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.

Referenced By

BN_num_bytes.3ssl(3), DH_generate_key.3ssl(3), DH_get0_pqg.3ssl(3), DH_meth_new.3ssl(3).

2018-06-20 1.1.1-pre8 OpenSSL