DH_size.3ssl man page

DH_size, DH_bits — get Diffie-Hellman prime size


#include <openssl/dh.h>
int DH_size(const DH *dh);
int DH_bits(const DH *dh);


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(3), DH_generate_key(3), BN_num_bits(3)


DH_bits() was added in OpenSSL 1.1.0.


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