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DH_generate_key(3) - DH_compute_key, DH_generate_key - perform Diffie-Hellman key exchange - man 3 DH_generate_key

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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_com-
       pute_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(3,4,6) private DH value unless dh->priv_key is
       already set(7,n,1 builtins), 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(1,8) dh and the other party's public value in(1,8) pub_key and stores it in(1,8)
       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(8,n) codes can be obtained by ERR_get_error(3).

SEE ALSO
       dh(3), ERR_get_error(3), rand(1,3)(3), DH_size(3)

HISTORY
       DH_generate_key() and DH_compute_key() are available in(1,8) all versions of
       SSLeay and OpenSSL.



0.9.7d                            2002-09-25                DH_generate_key(3)

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