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134 .IX Title "DH_generate_key 3"
135 .TH DH_generate_key 3 "2009-11-06" "0.9.8l" "OpenSSL"
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141 DH_generate_key, DH_compute_key \- perform Diffie\-Hellman key exchange
143 .IX Header "SYNOPSIS"
145 \& #include <openssl/dh.h>
147 \& int DH_generate_key(DH *dh);
149 \& int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
152 .IX Header "DESCRIPTION"
153 \&\fIDH_generate_key()\fR performs the first step of a Diffie-Hellman key
154 exchange by generating private and public \s-1DH\s0 values. By calling
155 \&\fIDH_compute_key()\fR, these are combined with the other party's public
156 value to compute the shared key.
158 \&\fIDH_generate_key()\fR expects \fBdh\fR to contain the shared parameters
159 \&\fBdh\->p\fR and \fBdh\->g\fR. It generates a random private \s-1DH\s0 value
160 unless \fBdh\->priv_key\fR is already set, and computes the
161 corresponding public value \fBdh\->pub_key\fR, which can then be
164 \&\fIDH_compute_key()\fR computes the shared secret from the private \s-1DH\s0 value
165 in \fBdh\fR and the other party's public value in \fBpub_key\fR and stores
166 it in \fBkey\fR. \fBkey\fR must point to \fBDH_size(dh)\fR bytes of memory.
168 .IX Header "RETURN VALUES"
169 \&\fIDH_generate_key()\fR returns 1 on success, 0 otherwise.
171 \&\fIDH_compute_key()\fR returns the size of the shared secret on success, \-1
174 The error codes can be obtained by \fIERR_get_error\fR\|(3).
176 .IX Header "SEE ALSO"
177 \&\fIdh\fR\|(3), \fIERR_get_error\fR\|(3), \fIrand\fR\|(3), \fIDH_size\fR\|(3)
180 \&\fIDH_generate_key()\fR and \fIDH_compute_key()\fR are available in all versions
181 of SSLeay and OpenSSL.