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NetBSD 6.1.5 - man page for dh_generate_key (netbsd section 3)

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DH_generate_key(3)			     OpenSSL			       DH_generate_key(3)

       DH_generate_key, DH_compute_key - perform Diffie-Hellman key exchange

       libcrypto, -lcrypto

	#include <openssl/dh.h>

	int DH_generate_key(DH *dh);

	int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);

       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.

       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).

       openssl_dh(3), ERR_get_error(3), openssl_rand(3), DH_size(3)

       DH_generate_key() and DH_compute_key() are available in all versions of SSLeay and

1.0.1i					    2009-07-20			       DH_generate_key(3)
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