[netbsd-mini2440.git] / crypto / external / bsd / openssl / lib / libcrypto / man / RSA_blinding_on.3
| blob | edf1737957f73e5a3e54abcceda8a35eae4a0759 |
1 .\" $NetBSD: libcrypto.pl,v 1.3 2007/11/27 22:16:03 christos Exp $
2 .\"
3 .\" Automatically generated by Pod::Man 2.16 (Pod::Simple 3.05)
4 .\"
5 .\" Standard preamble:
6 .\" ========================================================================
7 .de Sh \" Subsection heading
8 .br
9 .if t .Sp
10 .ne 5
11 .PP
12 \fB\\$1\fR
13 .PP
14 ..
15 .de Sp \" Vertical space (when we can't use .PP)
16 .if t .sp .5v
17 .if n .sp
18 ..
19 .de Vb \" Begin verbatim text
20 .ft CW
21 .nf
22 .ne \\$1
23 ..
24 .de Ve \" End verbatim text
25 .ft R
26 .fi
27 ..
28 .\" Set up some character translations and predefined strings. \*(-- will
29 .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left
30 .\" double quote, and \*(R" will give a right double quote. \*(C+ will
31 .\" give a nicer C++. Capital omega is used to do unbreakable dashes and
32 .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff,
33 .\" nothing in troff, for use with C<>.
34 .tr \(*W-
35 .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p'
36 .ie n \{\
37 . ds -- \(*W-
38 . ds PI pi
39 . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch
40 . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch
41 . ds L" ""
42 . ds R" ""
43 . ds C` ""
44 . ds C' ""
45 'br\}
46 .el\{\
47 . ds -- \|\(em\|
48 . ds PI \(*p
49 . ds L" ``
50 . ds R" ''
51 'br\}
52 .\"
53 .\" Escape single quotes in literal strings from groff's Unicode transform.
54 .ie \n(.g .ds Aq \(aq
55 .el .ds Aq '
56 .\"
57 .\" If the F register is turned on, we'll generate index entries on stderr for
58 .\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index
59 .\" entries marked with X<> in POD. Of course, you'll have to process the
60 .\" output yourself in some meaningful fashion.
61 .ie \nF \{\
62 . de IX
63 . tm Index:\\$1\t\\n%\t"\\$2"
64 ..
65 . nr % 0
66 . rr F
67 .\}
68 .el \{\
69 . de IX
70 ..
71 .\}
72 .\"
73 .\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2).
74 .\" Fear. Run. Save yourself. No user-serviceable parts.
75 . \" fudge factors for nroff and troff
76 .if n \{\
77 . ds #H 0
78 . ds #V .8m
79 . ds #F .3m
80 . ds #[ \f1
81 . ds #] \fP
82 .\}
83 .if t \{\
84 . ds #H ((1u-(\\\\n(.fu%2u))*.13m)
85 . ds #V .6m
86 . ds #F 0
87 . ds #[ \&
88 . ds #] \&
89 .\}
90 . \" simple accents for nroff and troff
91 .if n \{\
92 . ds ' \&
93 . ds ` \&
94 . ds ^ \&
95 . ds , \&
96 . ds ~ ~
97 . ds /
98 .\}
99 .if t \{\
100 . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u"
101 . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u'
102 . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u'
103 . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u'
104 . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u'
105 . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u'
106 .\}
107 . \" troff and (daisy-wheel) nroff accents
108 .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V'
109 .ds 8 \h'\*(#H'\(*b\h'-\*(#H'
110 .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#]
111 .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H'
112 .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u'
113 .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#]
114 .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#]
115 .ds ae a\h'-(\w'a'u*4/10)'e
116 .ds Ae A\h'-(\w'A'u*4/10)'E
117 . \" corrections for vroff
118 .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u'
119 .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u'
120 . \" for low resolution devices (crt and lpr)
121 .if \n(.H>23 .if \n(.V>19 \
122 \{\
123 . ds : e
124 . ds 8 ss
125 . ds o a
126 . ds d- d\h'-1'\(ga
127 . ds D- D\h'-1'\(hy
128 . ds th \o'bp'
129 . ds Th \o'LP'
130 . ds ae ae
131 . ds Ae AE
132 .\}
133 .rm #[ #] #H #V #F C
134 .\" ========================================================================
135 .\"
136 .IX Title "RSA_blinding_on 3"
137 .TH RSA_blinding_on 3 "2000-02-24" "1.1.0-dev" "OpenSSL"
138 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
139 .\" way too many mistakes in technical documents.
140 .if n .ad l
141 .nh
142 .SH "NAME"
143 RSA_blinding_on, RSA_blinding_off \- protect the RSA operation from timing attacks
144 .SH "LIBRARY"
145 libcrypto, -lcrypto
146 .SH "SYNOPSIS"
147 .IX Header "SYNOPSIS"
148 .Vb 1
149 \& #include <openssl/rsa.h>
150 \&
151 \& int RSA_blinding_on(RSA *rsa, BN_CTX *ctx);
152 \&
153 \& void RSA_blinding_off(RSA *rsa);
154 .Ve
155 .SH "DESCRIPTION"
156 .IX Header "DESCRIPTION"
157 \&\s-1RSA\s0 is vulnerable to timing attacks. In a setup where attackers can
158 measure the time of \s-1RSA\s0 decryption or signature operations, blinding
159 must be used to protect the \s-1RSA\s0 operation from that attack.
160 .PP
161 \&\fIRSA_blinding_on()\fR turns blinding on for key \fBrsa\fR and generates a
162 random blinding factor. \fBctx\fR is \fB\s-1NULL\s0\fR or a pre-allocated and
163 initialized \fB\s-1BN_CTX\s0\fR. The random number generator must be seeded
164 prior to calling \fIRSA_blinding_on()\fR.
165 .PP
166 \&\fIRSA_blinding_off()\fR turns blinding off and frees the memory used for
167 the blinding factor.
168 .SH "RETURN VALUES"
169 .IX Header "RETURN VALUES"
170 \&\fIRSA_blinding_on()\fR returns 1 on success, and 0 if an error occurred.
171 .PP
172 \&\fIRSA_blinding_off()\fR returns no value.
173 .SH "SEE ALSO"
174 .IX Header "SEE ALSO"
175 \&\fIopenssl_rsa\fR\|(3), \fIopenssl_rand\fR\|(3)
176 .SH "HISTORY"
177 .IX Header "HISTORY"
178 \&\fIRSA_blinding_on()\fR and \fIRSA_blinding_off()\fR appeared in SSLeay 0.9.0.