1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<!-- This manual is last updated 4 March 2015 for version
3.5.3 of GnuTLS.
Copyright (C) 2001-2015 Free Software Foundation, Inc.\\
Copyright (C) 2001-2015 Nikos Mavrogiannopoulos
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with no
Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
copy of the license is included in the section entitled "GNU Free
Documentation License". -->
<!-- Created by GNU Texinfo 6.1, http://www.gnu.org/software/texinfo/ -->
<head>
<title>GnuTLS 3.5.3: Trusted Platform Module</title>
<meta name="description" content="GnuTLS 3.5.3: Trusted Platform Module">
<meta name="keywords" content="GnuTLS 3.5.3: Trusted Platform Module">
<meta name="resource-type" content="document">
<meta name="distribution" content="global">
<meta name="Generator" content="makeinfo">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<link href="index.html#Top" rel="start" title="Top">
<link href="Function-and-Data-Index.html#Function-and-Data-Index" rel="index" title="Function and Data Index">
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
<link href="Hardware-security-modules-and-abstract-key-types.html#Hardware-security-modules-and-abstract-key-types" rel="up" title="Hardware security modules and abstract key types">
<link href="Keys-in-TPM.html#Keys-in-TPM" rel="next" title="Keys in TPM">
<link href="p11tool-Invocation.html#p11tool-Invocation" rel="prev" title="p11tool Invocation">
<style type="text/css">
<!--
a.summary-letter {text-decoration: none}
blockquote.indentedblock {margin-right: 0em}
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
blockquote.smallquotation {font-size: smaller}
div.display {margin-left: 3.2em}
div.example {margin-left: 3.2em}
div.lisp {margin-left: 3.2em}
div.smalldisplay {margin-left: 3.2em}
div.smallexample {margin-left: 3.2em}
div.smalllisp {margin-left: 3.2em}
kbd {font-style: oblique}
pre.display {font-family: inherit}
pre.format {font-family: inherit}
pre.menu-comment {font-family: serif}
pre.menu-preformatted {font-family: serif}
pre.smalldisplay {font-family: inherit; font-size: smaller}
pre.smallexample {font-size: smaller}
pre.smallformat {font-family: inherit; font-size: smaller}
pre.smalllisp {font-size: smaller}
span.nolinebreak {white-space: nowrap}
span.roman {font-family: initial; font-weight: normal}
span.sansserif {font-family: sans-serif; font-weight: normal}
ul.no-bullet {list-style: none}
body {
margin: 2%;
padding: 0 5%;
background: #ffffff;
}
h1,h2,h3,h4,h5 {
font-weight: bold;
padding: 5px 5px 5px 5px;
background-color: #c2e0ff;
color: #336699;
}
h1 {
padding: 2em 2em 2em 5%;
color: white;
background: #336699;
text-align: center;
letter-spacing: 3px;
}
h2 { text-decoration: underline; }
pre {
margin: 0 5%;
padding: 0.5em;
}
pre.example,pre.verbatim {
padding-bottom: 1em;
border: solid #c2e0ff;
background: #f0faff;
border-width: 1px 1px 1px 5px;
margin: 1em auto;
width: 90%;
}
div.node {
margin: 0 -5% 0 -2%;
padding: 0.5em 0.5em;
margin-top: 0.5em;
margin-bottom: 0.5em;
font-weight: bold;
}
dd, li {
padding-top: 0.1em;
padding-bottom: 0.1em;
}
div.float {
margin-bottom: 0.5em;
text-align: center;
}
table {
text-align: left;
margin-left:auto;
margin-right:auto;
border-spacing: 7px;
width: 50%;
}
th {
padding: 0;
color: #336699;
background-color: #c2e0ff;
border: solid #000000;
border-width: 0px;
margin: 1em auto;
text-align: center;
margin-left:auto;
margin-right:auto;
}
td {
padding: 0;
border: solid #000000;
background-color: #f0faff;
border-width: 0px;
margin: 1em auto;
text-align: left;
margin-left:auto;
margin-right:auto;
padding-left: 1em;
}
dl {
text-align: left;
margin-left:auto;
margin-right:auto;
width: 50%;
padding-left: 1em;
border: solid #c2e0ff;
background: #f0faff;
border-width: 5px 1px 1px 1px;
margin: 1em auto;
}
-->
</style>
</head>
<body lang="en">
<a name="Trusted-Platform-Module"></a>
<div class="header">
<p>
Previous: <a href="Smart-cards-and-HSMs.html#Smart-cards-and-HSMs" accesskey="p" rel="prev">Smart cards and HSMs</a>, Up: <a href="Hardware-security-modules-and-abstract-key-types.html#Hardware-security-modules-and-abstract-key-types" accesskey="u" rel="up">Hardware security modules and abstract key types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-and-Data-Index.html#Function-and-Data-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Trusted-Platform-Module-_0028TPM_0029"></a>
<h3 class="section">5.4 Trusted Platform Module (TPM)</h3>
<a name="index-trusted-platform-module"></a>
<a name="index-TPM"></a>
<p>In this section we present the Trusted Platform Module (TPM) support
in <acronym>GnuTLS</acronym>. Note that we recommend against using TPM with this
API because it is restricted to TPM 1.2. We recommend instead
to use PKCS#11 wrappers for TPM such as CHAPS<a name="DOCF14" href="#FOOT14"><sup>14</sup></a> or opencryptoki<a name="DOCF15" href="#FOOT15"><sup>15</sup></a>.
These will allow using the standard smart card and HSM functionality (see <a href="Smart-cards-and-HSMs.html#Smart-cards-and-HSMs">Smart cards and HSMs</a>) for TPM keys.
</p>
<p>There was a big hype when the TPM chip was introduced into
computers. Briefly it is a co-processor in your PC that allows it to perform
calculations independently of the main processor. This has good and bad
side-effects. In this section we focus on the good ones; these are the fact that
you can use the TPM chip to perform cryptographic operations on keys stored in it, without
accessing them. That is very similar to the operation of a <acronym>PKCS</acronym> #11 smart card.
The chip allows for storage and usage of RSA keys, but has quite some
operational differences from <acronym>PKCS</acronym> #11 module, and thus require different handling.
The basic TPM operations supported and used by GnuTLS, are key generation and signing.
That support is currently limited to TPM 1.2.
</p>
<p>The next sections assume that the TPM chip in the system is already initialized and
in a operational state. If not, ensure that the TPM chip is enabled by your BIOS,
that the <code>tcsd</code> daemon is running, and that TPM ownership is set
(by running <code>tpm_takeownership</code>).
</p>
<p>In GnuTLS the TPM functionality is available in <code>gnutls/tpm.h</code>.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">• <a href="Keys-in-TPM.html#Keys-in-TPM" accesskey="1">Keys in TPM</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Key-generation.html#Key-generation" accesskey="2">Key generation</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="Using-keys.html#Using-keys" accesskey="3">Using keys</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">• <a href="tpmtool-Invocation.html#tpmtool-Invocation" accesskey="4">tpmtool Invocation</a>:</td><td> </td><td align="left" valign="top">
</td></tr>
</table>
<div class="footnote">
<hr>
<h4 class="footnotes-heading">Footnotes</h4>
<h3><a name="FOOT14" href="#DOCF14">(14)</a></h3>
<p><a href="https://github.com/google/chaps-linux">https://github.com/google/chaps-linux</a></p>
<h3><a name="FOOT15" href="#DOCF15">(15)</a></h3>
<p><a href="https://sourceforge.net/projects/opencryptoki/">https://sourceforge.net/projects/opencryptoki/</a></p>
</div>
<hr>
<div class="header">
<p>
Previous: <a href="Smart-cards-and-HSMs.html#Smart-cards-and-HSMs" accesskey="p" rel="prev">Smart cards and HSMs</a>, Up: <a href="Hardware-security-modules-and-abstract-key-types.html#Hardware-security-modules-and-abstract-key-types" accesskey="u" rel="up">Hardware security modules and abstract key types</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-and-Data-Index.html#Function-and-Data-Index" title="Index" rel="index">Index</a>]</p>
</div>
</body>
</html>
|
