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4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson<p><span class="application">isc-hmac-fixup</span> — fixes HMAC keys generated by older versions of BIND</p>
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson<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>
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson<a name="id2618613"></a><h2>DESCRIPTION</h2>
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson Versions of BIND 9 up to and including BIND 9.6 had a bug causing
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson HMAC-SHA* TSIG keys which were longer than the digest length of the
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson hash algorithm (i.e., SHA1 keys longer than 160 bits, SHA256 keys
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson longer than 256 bits, etc) to be used incorrectly, generating a
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson message authentication code that was incompatible with other DNS
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson implementations.
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson This bug has been fixed in BIND 9.7. However, the fix may
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson cause incompatibility between older and newer versions of
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson BIND, when using long keys. <span><strong class="command">isc-hmac-fixup</strong></span>
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson modifies those keys to restore compatibility.
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson To modify a key, run <span><strong class="command">isc-hmac-fixup</strong></span> and
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson specify the key's algorithm and secret on the command line. If the
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson secret is longer than the digest length of the algorithm (64 bytes
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson for SHA1 through SHA256, or 128 bytes for SHA384 and SHA512), then a
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson new secret will be generated consisting of a hash digest of the old
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson secret. (If the secret did not require conversion, then it will be
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson printed without modification.)
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson<a name="id2659942"></a><h2>SECURITY CONSIDERATIONS</h2>
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson Secrets that have been converted by <span><strong class="command">isc-hmac-fixup</strong></span>
4848fe4ad2c0ba6e2e69e4a2617727f8556d79a0Andreas Gustafsson are shortened, but as this is how the HMAC protocol works in