DNSSEC-KEYGEN(8)DNSSEC-KEYGEN(8)NAMEdnssec-keygen - DNSSEC key generation tool
SYNOPSISdnssec-keygen-a algorithm -b keysize -n nametype [ -c class ] [ -e ] [
-g generator ] [ -h ] [ -p protocol ] [ -r randomdev ] [ -s strength
] [ -t type ] [ -v level ] name
DESCRIPTIONdnssec-keygen generates keys for DNSSEC (Secure DNS), as defined in RFC
2535. 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 or RSA, DSA, DH (Diffie Hellman), or HMAC-MD5. These
values are case insensitive.
Note that for DNSSEC, DSA is a mandatory to implement algorithm, and
RSA is recommended. For TSIG, HMAC-MD5 is mandatory.
-b keysize
Specifies the number of bits in the key. The choice of key size
depends on the algorithm used. RSA 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), HOST or ENTITY (for a key
associated with a host), or USER (for a key associated with a user).
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 RSA key, use a large exponent.
-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.
-p protocol
Sets the protocol value for the generated key. The protocol is a
number between 0 and 255. The default is 2 (email) for keys of type
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USER and 3 (DNSSEC) for all other key types. 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. These strings can be used as arguments to
dnssec-makekeyset.
o nnnn is the key name.
o aaa is the numeric representation of the algorithm.
o 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.
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DNSSEC-KEYGEN(8)DNSSEC-KEYGEN(8)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 ALSOdnssec-makekeyset(8), dnssec-signkey(8), dnssec-signzone(8), BIND 9
Administrator Reference Manual, RFC 2535, RFC 2845, RFC 2539.
AUTHOR
Internet Software Consortium
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