ISC-HMAC-FIXUP(1) BIND9 ISC-HMAC-FIXUP(1)NAME
isc-hmac-fixup - fixes HMAC keys generated by older versions of BIND
SYNOPSIS
isc-hmac-fixup {algorithm} {secret}
DESCRIPTION
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.
This bug has been fixed in BIND 9.7. However, the fix may cause incompatibility between older and newer versions of BIND, when using long
keys. isc-hmac-fixup modifies those keys to restore compatibility.
To modify a key, run isc-hmac-fixup 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.)
SECURITY CONSIDERATIONS
Secrets that have been converted by isc-hmac-fixup 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."
SEE ALSO
BIND 9 Administrator Reference Manual, RFC 2104.
AUTHOR
Internet Systems Consortium
COPYRIGHT
Copyright (C) 2010 Internet Systems Consortium, Inc. ("ISC")
BIND9 January 5, 2010 ISC-HMAC-FIXUP(1)
Check Out this Related Man Page
Digest::HMAC(3) User Contributed Perl Documentation Digest::HMAC(3)NAME
Digest::HMAC - Keyed-Hashing for Message Authentication
SYNOPSIS
# Functional style
use Digest::HMAC qw(hmac hmac_hex);
$digest = hmac($data, $key, &myhash);
print hmac_hex($data, $key, &myhash);
# OO style
use Digest::HMAC;
$hmac = Digest::HMAC->new($key, "Digest::MyHash");
$hmac->add($data);
$hmac->addfile(*FILE);
$digest = $hmac->digest;
$digest = $hmac->hexdigest;
$digest = $hmac->b64digest;
DESCRIPTION
HMAC is used for message integrity checks between two parties that share a secret key, and works in combination with some other Digest
algorithm, usually MD5 or SHA-1. The HMAC mechanism is described in RFC 2104.
HMAC follow the common "Digest::" interface, but the constructor takes the secret key and the name of some other simple "Digest::" as
argument.
The hmac() and hmac_hex() functions and the Digest::HMAC->new() constructor takes an optional $blocksize argument as well. The HMAC
algorithm assumes the digester to hash by iterating a basic compression function on blocks of data and the $blocksize should match the
byte-length of such blocks.
The default $blocksize is 64 which is suitable for the MD5 and SHA-1 digest functions. For stronger algorithms the blocksize probably
needs to be increased.
SEE ALSO
Digest::HMAC_MD5, Digest::HMAC_SHA1
RFC 2104
AUTHORS
Graham Barr <gbarr@ti.com>, Gisle Aas <gisle@aas.no>
perl v5.16.2 2011-07-25 Digest::HMAC(3)
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