=pod
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=head1 NAME
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DH_generate_key, DH_compute_key - perform Diffie-Hellman key exchange
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=head1 SYNOPSIS
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#include <openssl/dh.h>
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int DH_generate_key(DH *dh);
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int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
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=head1 DESCRIPTION
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DH_generate_key() performs the first step of a Diffie-Hellman key
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exchange by generating private and public DH values. By calling
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DH_compute_key(), these are combined with the other party's public
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value to compute the shared key.
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DH_generate_key() expects B<dh> to contain the shared parameters
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B<dh-E<gt>p> and B<dh-E<gt>g>. It generates a random private DH value
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unless B<dh-E<gt>priv_key> is already set, and computes the
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corresponding public value B<dh-E<gt>pub_key>, which can then be
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published.
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DH_compute_key() computes the shared secret from the private DH value
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in B<dh> and the other party's public value in B<pub_key> and stores
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it in B<key>. B<key> must point to B<DH_size(dh)> bytes of memory.
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=head1 RETURN VALUES
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DH_generate_key() returns 1 on success, 0 otherwise.
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DH_compute_key() returns the size of the shared secret on success, -1
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on error.
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The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>.
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=head1 SEE ALSO
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L<dh(3)|dh(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<rand(3)|rand(3)>, L<DH_size(3)|DH_size(3)>
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=head1 HISTORY
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DH_generate_key() and DH_compute_key() are available in all versions
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of SSLeay and OpenSSL.
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=cut
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