NAME

DH_size, DH_bits - get Diffie-Hellman prime size

SYNOPSIS

#include <openssl/dh.h>

int DH_size(const DH *dh);

int DH_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().

DH_bits() returns the number of significant bits.

dh and dh->p must not be NULL.

RETURN VALUE

The size.

SEE ALSO

dh, DH_generate_key, BN_num_bits

HISTORY

DH_size() is available in all versions of SSLeay and OpenSSL. DH_bits() was added in OpenSSL 1.1.0.