1DH_GENERATE_KEY(3)                  OpenSSL                 DH_GENERATE_KEY(3)
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NAME

6       DH_generate_key, DH_compute_key - perform Diffie-Hellman key exchange
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SYNOPSIS

9        #include <openssl/dh.h>
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11        int DH_generate_key(DH *dh);
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13        int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
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DESCRIPTION

16       DH_generate_key() performs the first step of a Diffie-Hellman key
17       exchange by generating private and public DH values. By calling
18       DH_compute_key(), these are combined with the other party's public
19       value to compute the shared key.
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21       DH_generate_key() expects dh to contain the shared parameters dh->p and
22       dh->g. It generates a random private DH value unless dh->priv_key is
23       already set, and computes the corresponding public value dh->pub_key,
24       which can then be published.
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26       DH_compute_key() computes the shared secret from the private DH value
27       in dh and the other party's public value in pub_key and stores it in
28       key. key must point to DH_size(dh) bytes of memory.
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RETURN VALUES

31       DH_generate_key() returns 1 on success, 0 otherwise.
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33       DH_compute_key() returns the size of the shared secret on success, -1
34       on error.
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36       The error codes can be obtained by ERR_get_error(3).
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SEE ALSO

39       DH_new(3), ERR_get_error(3), RAND_bytes(3), DH_size(3)
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42       Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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44       Licensed under the OpenSSL license (the "License").  You may not use
45       this file except in compliance with the License.  You can obtain a copy
46       in the file LICENSE in the source distribution or at
47       <https://www.openssl.org/source/license.html>.
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511.1.1d                            2019-10-03                DH_GENERATE_KEY(3)
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