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authorbeck <>2000-03-19 11:13:58 +0000
committerbeck <>2000-03-19 11:13:58 +0000
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OpenSSL 0.9.5 merge
*warning* this bumps shared lib minors for libssl and libcrypto from 2.1 to 2.2 if you are using the ssl26 packages for ssh and other things to work you will need to get new ones (see ~beck/libsslsnap/<arch>) on cvs or ~beck/src-patent.tar.gz on cvs
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1=pod
2
3=head1 NAME
4
5DH_generate_key, DH_compute_key - perform Diffie-Hellman key exchange
6
7=head1 SYNOPSIS
8
9 #include <openssl/dh.h>
10
11 int DH_generate_key(DH *dh);
12
13 int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
14
15=head1 DESCRIPTION
16
17DH_generate_key() performs the first step of a Diffie-Hellman key
18exchange by generating private and public DH values. By calling
19DH_compute_key(), these are combined with the other party's public
20value to compute the shared key.
21
22DH_generate_key() expects B<dh> to contain the shared parameters
23B<dh-E<gt>p> and B<dh-E<gt>g>. It generates a random private DH value
24unless B<dh-E<gt>priv_key> is already set, and computes the
25corresponding public value B<dh-E<gt>pub_key>, which can then be
26published.
27
28DH_compute_key() computes the shared secret from the private DH value
29in B<dh> and the other party's public value in B<pub_key> and stores
30it in B<key>. B<key> must point to B<DH_size(dh)> bytes of memory.
31
32=head1 RETURN VALUES
33
34DH_generate_key() returns 1 on success, 0 otherwise.
35
36DH_compute_key() returns the size of the shared secret on success, -1
37on error.
38
39The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>.
40
41=head1 SEE ALSO
42
43L<dh(3)|dh(3)>, L<err(3)|err(3)>, L<rand(3)|rand(3)>, L<DH_size(3)|DH_size(3)>
44
45=head1 HISTORY
46
47DH_generate_key() and DH_compute_key() are available in all versions
48of SSLeay and OpenSSL.
49
50=cut