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131 .IX Title "DH_generate_key 3"
132 .TH DH_generate_key 3 "2009-07-23" "0.9.8k" "OpenSSL"
134 DH_generate_key, DH_compute_key \- perform Diffie\-Hellman key exchange
136 .IX Header "SYNOPSIS"
138 \& #include <openssl/dh.h>
142 \& int DH_generate_key(DH *dh);
146 \& int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
149 .IX Header "DESCRIPTION"
150 \&\fIDH_generate_key()\fR performs the first step of a Diffie-Hellman key
151 exchange by generating private and public \s-1DH\s0 values. By calling
152 \&\fIDH_compute_key()\fR, these are combined with the other party's public
153 value to compute the shared key.
155 \&\fIDH_generate_key()\fR expects \fBdh\fR to contain the shared parameters
156 \&\fBdh\->p\fR and \fBdh\->g\fR. It generates a random private \s-1DH\s0 value
157 unless \fBdh\->priv_key\fR is already set, and computes the
158 corresponding public value \fBdh\->pub_key\fR, which can then be
161 \&\fIDH_compute_key()\fR computes the shared secret from the private \s-1DH\s0 value
162 in \fBdh\fR and the other party's public value in \fBpub_key\fR and stores
163 it in \fBkey\fR. \fBkey\fR must point to \fBDH_size(dh)\fR bytes of memory.
165 .IX Header "RETURN VALUES"
166 \&\fIDH_generate_key()\fR returns 1 on success, 0 otherwise.
168 \&\fIDH_compute_key()\fR returns the size of the shared secret on success, \-1
171 The error codes can be obtained by \fIERR_get_error\fR\|(3).
173 .IX Header "SEE ALSO"
174 \&\fIdh\fR\|(3), \fIERR_get_error\fR\|(3), \fIrand\fR\|(3), \fIDH_size\fR\|(3)
177 \&\fIDH_generate_key()\fR and \fIDH_compute_key()\fR are available in all versions
178 of SSLeay and OpenSSL.