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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.



50                                               2013-03-05                               DH_generate_key(3)