1 .\" Automatically generated by Pod::Man 2.12 (Pod::Simple 3.05)
4 .\" ========================================================================
5 .de Sh \" Subsection heading
13 .de Sp \" Vertical space (when we can't use .PP)
17 .de Vb \" Begin verbatim text
22 .de Ve \" End verbatim text
26 .\" Set up some character translations and predefined strings. \*(-- will
27 .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
28 .\" double quote, and \*(R" will give a right double quote. \*(C+ will
29 .\" give a nicer C++. Capital omega is used to do unbreakable dashes and
30 .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
31 .\" nothing in troff, for use with C<>.
33 .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
37 . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
38 . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
51 .\" If the F register is turned on, we'll generate index entries on stderr for
52 .\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index
53 .\" entries marked with X<> in POD. Of course, you'll have to process the
54 .\" output yourself in some meaningful fashion.
57 . tm Index:\\$1\t\\n%\t"\\$2"
63 .\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
64 .\" Fear. Run. Save yourself. No user-serviceable parts.
65 . \" fudge factors for nroff and troff
74 . ds #H ((1u-(\\\\n(.fu%2u))*.13m)
80 . \" simple accents for nroff and troff
90 . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
91 . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
92 . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
93 . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
94 . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
95 . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
97 . \" troff and (daisy-wheel) nroff accents
98 .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
99 .ds 8 \h'\*(#H'\(*b\h'-\*(#H'
100 .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
101 .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
102 .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
103 .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
104 .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
105 .ds ae a\h'-(\w'a'u*4/10)'e
106 .ds Ae A\h'-(\w'A'u*4/10)'E
107 . \" corrections for vroff
108 .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
109 .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
110 . \" for low resolution devices (crt and lpr)
111 .if \n(.H>23 .if \n(.V>19 \
124 .\" ========================================================================
126 .IX Title "DH_generate_key 3"
127 .TH DH_generate_key 3 "2007-10-24" "0.9.8g" "OpenSSL"
128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
129 .\" way too many mistakes in technical documents.
133 DH_generate_key, DH_compute_key \- perform Diffie\-Hellman key exchange
135 .IX Header "SYNOPSIS"
137 \& #include <openssl/dh.h>
139 \& int DH_generate_key(DH *dh);
141 \& int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
144 .IX Header "DESCRIPTION"
145 \&\fIDH_generate_key()\fR performs the first step of a Diffie-Hellman key
146 exchange by generating private and public \s-1DH\s0 values. By calling
147 \&\fIDH_compute_key()\fR, these are combined with the other party's public
148 value to compute the shared key.
150 \&\fIDH_generate_key()\fR expects \fBdh\fR to contain the shared parameters
151 \&\fBdh\->p\fR and \fBdh\->g\fR. It generates a random private \s-1DH\s0 value
152 unless \fBdh\->priv_key\fR is already set, and computes the
153 corresponding public value \fBdh\->pub_key\fR, which can then be
156 \&\fIDH_compute_key()\fR computes the shared secret from the private \s-1DH\s0 value
157 in \fBdh\fR and the other party's public value in \fBpub_key\fR and stores
158 it in \fBkey\fR. \fBkey\fR must point to \fBDH_size(dh)\fR bytes of memory.
160 .IX Header "RETURN VALUES"
161 \&\fIDH_generate_key()\fR returns 1 on success, 0 otherwise.
163 \&\fIDH_compute_key()\fR returns the size of the shared secret on success, \-1
166 The error codes can be obtained by \fIERR_get_error\fR\|(3).
168 .IX Header "SEE ALSO"
169 \&\fIdh\fR\|(3), \fIERR_get_error\fR\|(3), \fIrand\fR\|(3), \fIDH_size\fR\|(3)
172 \&\fIDH_generate_key()\fR and \fIDH_compute_key()\fR are available in all versions
173 of SSLeay and OpenSSL.