huschi.net

DH_generate_key(3)                  OpenSSL                 DH_generate_key(3)

NAME
       DH_generate_key, DH_compute_key - perform Diffie-Hellman key exchange
SYNOPSIS
        #include <openssl/dh.h>
        int DH_generate_key(DH *dh);
        int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
DESCRIPTION
       DH_generate_key() performs the first step of a Diffie-Hellman key
       exchange by generating private and public DH values. By calling
       DH_compute_key(), these are combined with the other party's public
       value to compute the shared key.
       DH_generate_key() expects dh to contain the shared parameters dh->p and
       dh->g. It generates a random private DH value unless dh->priv_key is
       already set, and computes the corresponding public value dh->pub_key,
       which can then be published.
       DH_compute_key() computes the shared secret from the private DH value
       in dh and the other party's public value in pub_key and stores it in
       key. key must point to DH_size(dh) bytes of memory.
RETURN VALUES
       DH_generate_key() returns 1 on success, 0 otherwise.
       DH_compute_key() returns the size of the shared secret on success, -1
       on error.
       The error codes can be obtained by ERR_get_error(3).
SEE ALSO
       dh(3), ERR_get_error(3), rand(3), DH_size(3)
HISTORY
       DH_generate_key() and DH_compute_key() are available in all versions of
       SSLeay and OpenSSL.

1.0.2k                            2017-01-26                DH_generate_key(3)