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DNSSEC-KEYGEN(8)		     BIND9		      DNSSEC-KEYGEN(8)

NAME
       dnssec-keygen - DNSSEC key generation tool

SYNOPSIS
       dnssec-keygen {-a algorithm} {-b keysize} {-n nametype} [-c class] [-e]
		     [-f flag] [-g generator] [-h] [-k] [-p protocol]
		     [-r randomdev] [-s strength] [-t type] [-v level] {name}

DESCRIPTION
       dnssec-keygen generates keys for DNSSEC (Secure DNS), as defined in RFC
       2535 and RFC <TBA\>. It can also generate keys for use with TSIG
       (Transaction Signatures), as defined in RFC 2845.

OPTIONS
       -a algorithm
	  Selects the cryptographic algorithm. The value of algorithm must be
	  one of RSAMD5 (RSA) or RSASHA1, DSA, DH (Diffie Hellman), or
	  HMAC-MD5. These values are case insensitive.

	  Note 1: that for DNSSEC, RSASHA1 is a mandatory to implement
	  algorithm, and DSA is recommended. For TSIG, HMAC-MD5 is mandatory.

	  Note 2: HMAC-MD5 and DH automatically set the -k flag.

       -b keysize
	  Specifies the number of bits in the key. The choice of key size
	  depends on the algorithm used. RSAMD5 / RSASHA1 keys must be between
	  512 and 2048 bits. Diffie Hellman keys must be between 128 and 4096
	  bits. DSA keys must be between 512 and 1024 bits and an exact
	  multiple of 64. HMAC-MD5 keys must be between 1 and 512 bits.

       -n nametype
	  Specifies the owner type of the key. The value of nametype must
	  either be ZONE (for a DNSSEC zone key (KEY/DNSKEY)), HOST or ENTITY
	  (for a key associated with a host (KEY)), USER (for a key associated
	  with a user(KEY)) or OTHER (DNSKEY). These values are case
	  insensitive.

       -c class
	  Indicates that the DNS record containing the key should have the
	  specified class. If not specified, class IN is used.

       -e If generating an RSAMD5/RSASHA1 key, use a large exponent.

       -f flag
	  Set the specified flag in the flag field of the KEY/DNSKEY record.
	  The only recognized flag is KSK (Key Signing Key) DNSKEY.

       -g generator
	  If generating a Diffie Hellman key, use this generator. Allowed
	  values are 2 and 5. If no generator is specified, a known prime from
	  RFC 2539 will be used if possible; otherwise the default is 2.

       -h Prints a short summary of the options and arguments to
	  dnssec-keygen.

       -k Generate KEY records rather than DNSKEY records.

       -p protocol
	  Sets the protocol value for the generated key. The protocol is a
	  number between 0 and 255. The default is 3 (DNSSEC). Other possible
	  values for this argument are listed in RFC 2535 and its successors.

       -r randomdev
	  Specifies the source of randomness. If the operating system does not
	  provide a /dev/random or equivalent device, the default source of
	  randomness is keyboard input.	 randomdev specifies the name of a
	  character device or file containing random data to be used instead
	  of the default. The special value keyboard indicates that keyboard
	  input should be used.

       -s strength
	  Specifies the strength value of the key. The strength is a number
	  between 0 and 15, and currently has no defined purpose in DNSSEC.

       -t type
	  Indicates the use of the key.	 type must be one of AUTHCONF,
	  NOAUTHCONF, NOAUTH, or NOCONF. The default is AUTHCONF. AUTH refers
	  to the ability to authenticate data, and CONF the ability to encrypt
	  data.

       -v level
	  Sets the debugging level.

GENERATED KEYS
       When dnssec-keygen completes successfully, it prints a string of the
       form Knnnn.+aaa+iiiii to the standard output. This is an identification
       string for the key it has generated.

       ·  nnnn is the key name.

       ·  aaa is the numeric representation of the algorithm.

       ·  iiiii is the key identifier (or footprint).

dnssec-keygen creates two file, with names based on the printed string.
Knnnn.+aaa+iiiii.key contains the public key, and Knnnn.+aaa+iiiii.private
contains the private key.

The .key file contains a DNS KEY record that can be inserted into a zone file
(directly or with a $INCLUDE statement).

The .private file contains algorithm specific fields. For obvious security
reasons, this file does not have general read permission.

Both .key and .private files are generated for symmetric encryption algorithm
such as HMAC-MD5, even though the public and private key are equivalent.

EXAMPLE
       To generate a 768-bit DSA key for the domain example.com, the following
       command would be issued:

       dnssec-keygen -a DSA -b 768 -n ZONE example.com

       The command would print a string of the form:

       Kexample.com.+003+26160

       In this example, dnssec-keygen creates the files
       Kexample.com.+003+26160.key and Kexample.com.+003+26160.private

SEE ALSO
       dnssec-signzone(8), BIND 9 Administrator Reference Manual, RFC 2535,
       RFC 2845, RFC 2539.

AUTHOR
       Internet Systems Consortium

COPYRIGHT
       Copyright © 2004, 2005 Internet Systems Consortium, Inc. ("ISC")

BIND9				 June 30, 2000		      DNSSEC-KEYGEN(8)

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