NSEC3HASH(8) BIND9 NSEC3HASH(8)NAME
nsec3hash - generate NSEC3 hash
SYNOPSIS
nsec3hash {salt} {algorithm} {iterations} {domain}
DESCRIPTION
nsec3hash generates an NSEC3 hash based on a set of NSEC3 parameters. This can be used to check the validity of NSEC3 records in a signed
zone.
ARGUMENTS
salt
The salt provided to the hash algorithm.
algorithm
A number indicating the hash algorithm. Currently the only supported hash algorithm for NSEC3 is SHA-1, which is indicated by the
number 1; consequently "1" is the only useful value for this argument.
iterations
The number of additional times the hash should be performed.
domain
The domain name to be hashed.
SEE ALSO
BIND 9 Administrator Reference Manual, RFC 5155.
AUTHOR
Internet Systems Consortium
COPYRIGHT
Copyright (C) 2009 Internet Systems Consortium, Inc. ("ISC")
BIND9 Feb 18, 2009 NSEC3HASH(8)
Check Out this Related Man Page
ISC-HMAC-FIXUP(8) BIND9 ISC-HMAC-FIXUP(8)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, 2013 Internet Systems Consortium, Inc. ("ISC")
BIND9 January 5, 2010 ISC-HMAC-FIXUP(8)
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