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<h3>How to verify a checksum</h3>

<table class="wysiwyg-macro" data-macro-name="note" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e25vdGV9&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="RICH_TEXT"><tr><td class="wysiwyg-macro-body"><p>Unfortunately, the potential one-line solution: <code>sha1sum -c filename.jar.sha1</code> <span style="text-decoration: underline;">doesn't work</span> because it incorporates the filename into the calculation.</p></td></tr></table>

<h4>calculate the checksum:</h4>
<table class="wysiwyg-macro" data-macro-name="noformat" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e25vZm9ybWF0fQ&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
linux$ sha1sum commons-logging-1.0.4.jar
f029a2aefe2b3e1517573c580f948caac31b1056 *commons-logging-1.0.4.jar
</pre></td></tr></table>

<table class="wysiwyg-macro" data-macro-name="noformat" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e25vZm9ybWF0fQ&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
macorlinux$ openssl dgst -sha1 commons-logging-1.0.4.jar
SHA1(/Maven 2 Repo/commons-logging/commons-logging/1.0.4/commons-logging-1.0.4.jar)= f029a2aefe2b3e1517573c580f948caac31b1056
</pre></td></tr></table>

<table class="wysiwyg-macro" data-macro-name="info" data-macro-default-parameter="Windows users" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e2luZm86V2luZG93cyB1c2Vyc30&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="RICH_TEXT"><tr><td class="wysiwyg-macro-body"><p>If you're on Windows, Cygwin has the md5 and sha1 utilities:  <a href="http://www.cygwin.com">http://www.cygwin.com</a></p></td></tr></table>

<h4>then compare with the externally supplied checksum:</h4>

<table class="wysiwyg-macro" data-macro-name="noformat" style="background-image: url(/plugins/servlet/confluence/placeholder/macro-heading?definition=e25vZm9ybWF0fQ&amp;locale=en_GB&amp;version=2); background-repeat: no-repeat;" data-macro-body-type="PLAIN_TEXT"><tr><td class="wysiwyg-macro-body"><pre>
$ cat commons-logging-1.0.4.jar.sha1
f029a2aefe2b3e1517573c580f948caac31b1056
</pre></td></tr></table>