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2<!DOCTYPE sections SYSTEM "/dtd/book.dtd"> 2<!DOCTYPE sections SYSTEM "/dtd/book.dtd">
3 3
4<!-- The content of this document is licensed under the CC-BY-SA license --> 4<!-- The content of this document is licensed under the CC-BY-SA license -->
5<!-- See http://creativecommons.org/licenses/by-sa/2.5 --> 5<!-- See http://creativecommons.org/licenses/by-sa/2.5 -->
6 6
7<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/handbook/hb-install-alpha-medium.xml,v 1.57 2012/02/26 09:49:46 swift Exp $ --> 7<!-- $Header: /var/cvsroot/gentoo/xml/htdocs/doc/en/handbook/hb-install-alpha-medium.xml,v 1.60 2013/08/01 19:02:27 swift Exp $ -->
8 8
9<sections> 9<sections>
10 10
11<version>15</version> 11<version>18</version>
12<date>2012-02-26</date> 12<date>2013-08-01</date>
13 13
14<section> 14<section>
15<title>Hardware Requirements</title> 15<title>Hardware Requirements</title>
16<subsection> 16<subsection>
17<title>Introduction</title> 17<title>Introduction</title>
238can write on a CD-R. 238can write on a CD-R.
239</p> 239</p>
240 240
241<p> 241<p>
242In case you wonder if your downloaded file is corrupted or not, you can check 242In case you wonder if your downloaded file is corrupted or not, you can check
243its MD5 checksum and compare it with the MD5 checksum we provide (such as 243its SHA-2 checksum and compare it with the SHA-2 checksum we provide (such as
244<path><keyval id="min-cd-name"/>.DIGESTS</path>). You can check the MD5 checksum 244<path><keyval id="min-cd-name"/>.DIGESTS</path>). You can check the SHA-2 checksum
245with the <c>md5sum</c> tool under Linux/Unix or <uri 245with the <c>sha512sum</c> tool under Linux/Unix or <uri
246link="http://www.etree.org/md5com.html">md5sum</uri> for Windows. 246link="http://www.krylack.com/file-checksum-tool/">File Checksum Tool</uri> for Windows.
247</p>
248
249<pre caption="Verifying the SHA-2 checksum">
250$ <i>sha512sum -c &lt;downloaded iso.DIGESTS&gt;</i>
247</p> 251</pre>
252
253<note>
254If you get the message that no properly formatted SHA checksum was found, take a
255look at the DIGESTS file yourself to see what the supported checksums are.
256</note>
248 257
249<p> 258<p>
250Another way to check the validity of the downloaded file is to use GnuPG to 259Another way to check the validity of the downloaded file is to use GnuPG to
251verify the cryptographic signature that we provide (the file ending with 260verify the cryptographic signature that we provide (the file ending with
252<path>.asc</path>). Download the signature file and obtain the public keys: 261<path>.asc</path>). Download the signature file and obtain the public keys whose
262key ids can be found on the <uri link="/proj/en/releng/index.xml">release
263engineering project site</uri>.
253</p> 264</p>
254 265
255<pre caption="Obtaining the public key"> 266<pre caption="Obtaining the public key">
267<comment>(... Substitute the key ids with those mentioned on the release engineering site ...)</comment>
256$ <i>gpg --keyserver subkeys.pgp.net --recv-keys 96D8BF6D 2D182910 17072058</i> 268$ <i>gpg --keyserver subkeys.pgp.net --recv-keys 96D8BF6D 2D182910 17072058</i>
257</pre> 269</pre>
258 270
259<p> 271<p>
260Now verify the signature: 272Now verify the signature:
261</p> 273</p>
262 274
263<pre caption="Verify the files"> 275<pre caption="Verify the files">
264<comment>(Verify the cryptographic signature)</comment>
265$ <i>gpg --verify &lt;downloaded iso.DIGESTS.asc&gt;</i> 276$ <i>gpg --verify &lt;downloaded iso.DIGESTS.asc&gt;</i>
266<comment>(Verify the checksum)</comment>
267$ <i>sha1sum -c &lt;downloaded iso.DIGESTS.asc&gt;</i> 277$ <i>sha512sum -c &lt;downloaded iso.DIGESTS.asc&gt;</i>
268</pre> 278</pre>
269 279
270<p> 280<p>
271To burn the downloaded ISO(s), you have to select raw-burning. How you 281To burn the downloaded ISO(s), you have to select raw-burning. How you
272do this is highly program-dependent. We will discuss <c>cdrecord</c> and 282do this is highly program-dependent. We will discuss <c>cdrecord</c> and

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