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README
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man.isc-hmac-fixup.html
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notes.html
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Code Editor : man.isc-hmac-fixup.html
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <!-- - Copyright (C) 2000-2018 Internet Systems Consortium, Inc. ("ISC") - - This Source Code Form is subject to the terms of the Mozilla Public - License, v. 2.0. If a copy of the MPL was not distributed with this - file, You can obtain one at http://mozilla.org/MPL/2.0/. --> <html lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"> <title>isc-hmac-fixup</title> <meta name="generator" content="DocBook XSL Stylesheets V1.78.1"> <link rel="home" href="Bv9ARM.html" title="BIND 9 Administrator Reference Manual"> <link rel="up" href="Bv9ARM.ch13.html" title="Manual pages"> <link rel="prev" href="man.genrandom.html" title="genrandom"> <link rel="next" href="man.nsec3hash.html" title="nsec3hash"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <div class="navheader"> <table width="100%" summary="Navigation header"> <tr><th colspan="3" align="center"><span class="application">isc-hmac-fixup</span></th></tr> <tr> <td width="20%" align="left"> <a accesskey="p" href="man.genrandom.html">Prev</a>�</td> <th width="60%" align="center">Manual pages</th> <td width="20%" align="right">�<a accesskey="n" href="man.nsec3hash.html">Next</a> </td> </tr> </table> <hr> </div> <div class="refentry"> <a name="man.isc-hmac-fixup"></a><div class="titlepage"></div> <div class="refnamediv"> <h2>Name</h2> <p> <span class="application">isc-hmac-fixup</span> — fixes HMAC keys generated by older versions of BIND </p> </div> <div class="refsynopsisdiv"> <h2>Synopsis</h2> <div class="cmdsynopsis"><p> <code class="command">isc-hmac-fixup</code> {<em class="replaceable"><code>algorithm</code></em>} {<em class="replaceable"><code>secret</code></em>} </p></div> </div> <div class="refsection"> <a name="id-1.14.34.7"></a><h2>DESCRIPTION</h2> <p> Versions of BIND 9 up to and including BIND 9.6 had a bug causing HMAC-SHA* TSIG keys which were longer than the digest length of the hash algorithm (i.e., SHA1 keys longer than 160 bits, SHA256 keys longer than 256 bits, etc) to be used incorrectly, generating a message authentication code that was incompatible with other DNS implementations. </p> <p> This bug was fixed in BIND 9.7. However, the fix may cause incompatibility between older and newer versions of BIND, when using long keys. <span class="command"><strong>isc-hmac-fixup</strong></span> modifies those keys to restore compatibility. </p> <p> To modify a key, run <span class="command"><strong>isc-hmac-fixup</strong></span> and specify the key's algorithm and secret on the command line. If the secret is longer than the digest length of the algorithm (64 bytes for SHA1 through SHA256, or 128 bytes for SHA384 and SHA512), then a new secret will be generated consisting of a hash digest of the old secret. (If the secret did not require conversion, then it will be printed without modification.) </p> </div> <div class="refsection"> <a name="id-1.14.34.8"></a><h2>SECURITY CONSIDERATIONS</h2> <p> Secrets that have been converted by <span class="command"><strong>isc-hmac-fixup</strong></span> are shortened, but as this is how the HMAC protocol works in operation anyway, it does not affect security. RFC 2104 notes, "Keys longer than [the digest length] are acceptable but the extra length would not significantly increase the function strength." </p> </div> <div class="refsection"> <a name="id-1.14.34.9"></a><h2>SEE ALSO</h2> <p> <em class="citetitle">BIND 9 Administrator Reference Manual</em>, <em class="citetitle">RFC 2104</em>. </p> </div> </div> <div class="navfooter"> <hr> <table width="100%" summary="Navigation footer"> <tr> <td width="40%" align="left"> <a accesskey="p" href="man.genrandom.html">Prev</a>�</td> <td width="20%" align="center"><a accesskey="u" href="Bv9ARM.ch13.html">Up</a></td> <td width="40%" align="right">�<a accesskey="n" href="man.nsec3hash.html">Next</a> </td> </tr> <tr> <td width="40%" align="left" valign="top"> <span class="application">genrandom</span>�</td> <td width="20%" align="center"><a accesskey="h" href="Bv9ARM.html">Home</a></td> <td width="40%" align="right" valign="top">�<span class="application">nsec3hash</span> </td> </tr> </table> </div> <p xmlns:db="http://docbook.org/ns/docbook" style="text-align: center;">BIND 9.11.4-P2 (Extended Support Version)</p> </body> </html>
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