1 .\" Automatically generated by Pod::Man 2.23 (Pod::Simple 3.22)
4 .\" ========================================================================
5 .de Sp \" Vertical space (when we can't use .PP)
9 .de Vb \" Begin verbatim text
14 .de Ve \" End verbatim text
18 .\" Set up some character translations and predefined strings. \*(-- will
19 .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
20 .\" double quote, and \*(R" will give a right double quote. \*(C+ will
21 .\" give a nicer C++. Capital omega is used to do unbreakable dashes and
22 .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
23 .\" nothing in troff, for use with C<>.
25 .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
29 . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
30 . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
43 .\" Escape single quotes in literal strings from groff's Unicode transform.
47 .\" If the F register is turned on, we'll generate index entries on stderr for
48 .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
49 .\" entries marked with X<> in POD. Of course, you'll have to process the
50 .\" output yourself in some meaningful fashion.
53 . 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 "SSL_CTX_set_psk_client_callback 3"
127 .TH SSL_CTX_set_psk_client_callback 3 "2012-05-10" "1.0.1c" "OpenSSL"
128 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
129 .\" way too many mistakes in technical documents.
133 SSL_CTX_set_psk_client_callback, SSL_set_psk_client_callback \- set PSK client callback
135 .IX Header "SYNOPSIS"
137 \& #include <openssl/ssl.h>
139 \& void SSL_CTX_set_psk_client_callback(SSL_CTX *ctx,
140 \& unsigned int (*callback)(SSL *ssl, const char *hint,
141 \& char *identity, unsigned int max_identity_len,
142 \& unsigned char *psk, unsigned int max_psk_len));
143 \& void SSL_set_psk_client_callback(SSL *ssl,
144 \& unsigned int (*callback)(SSL *ssl, const char *hint,
145 \& char *identity, unsigned int max_identity_len,
146 \& unsigned char *psk, unsigned int max_psk_len));
149 .IX Header "DESCRIPTION"
150 A client application must provide a callback function which is called
151 when the client is sending the ClientKeyExchange message to the server.
153 The purpose of the callback function is to select the \s-1PSK\s0 identity and
154 the pre-shared key to use during the connection setup phase.
156 The callback is set using functions \fISSL_CTX_set_psk_client_callback()\fR
157 or \fISSL_set_psk_client_callback()\fR. The callback function is given the
158 connection in parameter \fBssl\fR, a \fB\s-1NULL\s0\fR\-terminated \s-1PSK\s0 identity hint
159 sent by the server in parameter \fBhint\fR, a buffer \fBidentity\fR of
160 length \fBmax_identity_len\fR bytes where the resulting
161 \&\fB\s-1NULL\s0\fR\-terminated identity is to be stored, and a buffer \fBpsk\fR of
162 length \fBmax_psk_len\fR bytes where the resulting pre-shared key is to
166 Note that parameter \fBhint\fR given to the callback may be \fB\s-1NULL\s0\fR.
168 .IX Header "RETURN VALUES"
169 Return values from the client callback are interpreted as follows:
171 On success (callback found a \s-1PSK\s0 identity and a pre-shared key to use)
172 the length (> 0) of \fBpsk\fR in bytes is returned.
174 Otherwise or on errors callback should return 0. In this case
175 the connection setup fails.