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DH_SIZE(3) Library Functions Manual DH_SIZE(3)

DH_sizeget Diffie-Hellman prime size

#include <openssl/dh.h>

DH_size(DH *dh);

This function returns the Diffie-Hellman 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 and dh->p must not be NULL.

The size in bytes.

BN_num_bytes(3), DH_generate_key(3), DH_new(3)

DH_size() is available in all versions of SSLeay and OpenSSL.

December 10, 2016 OpenBSD-6.1