AI2KEY(8) AI2KEY(8)
NAME
ai2key, dsagen, rsagen - generate and reformat public keys
SYNOPSIS
ai2key [ -t tag ] keyfile ...
dsagen [ -t tag ]
rsagen [ -b nbits ] [ -t tag ]
DESCRIPTION
Factotum(4) represents public keys as lists of attribute-
value pairs, each key on a single line prefixed with the
string key.
Ai2key converts the original Inferno representation of
authentication data, in the format defined for authinfo by
keytext(6), to an attribute-value format accepted by
factotum(4) for the infauth authentication protocol. For
each keyfile it writes a single line on standard output,
containing the following fields:
key proto=infauth [ tag ] sigalg=pkalg-hashalg [ dom=host
] server=host [ service=svc ] user=name signer=name
pk=pk !sk=sk spk=pk cert=cert dh-alpha=hex dh-p=hex
where
pkalg is dsa, elgamal or rsa
hashalg is md5 or sha1
user is the user name associated with the
key, as vouched for by the supporting
certificate cert
signer is the user name associated with the key
that signed the certificate
pk is the user's public key
!sk is the user's private (secret) key
spk is the signer's public key
cert is the certificate
dh-alpha, dh-p are the Diffie-Hellman parameters shared
by the user and file servers.
The key is tagged by one or more of dom, server and service,
derived from the file name keyfile. The server is `*' if
keyfile is default. Otherwise keyfile has the form
[ net! ] host [ !srv ]
and server and service are set accordingly; dom is set if
host looks like a domain name. Key and certificate values
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AI2KEY(8) AI2KEY(8)
have the form defined in keytext(6); hex is a large number
in hexadecimal.
Dsagen prints a randomly-generated DSA private key using the
NIST-recommended algorithm. If tag text is specified, it is
printed after the proto attribute-value pair. Typically,
tag is a sequence of attribute-value comments describing the
key. A DSA key has the following attributes
p prime public modulus
q prime group order; divides p-1
alpha group generator
key alpha^!secret mod p
!secret the secret exponent
Rsagen prints a randomly generated RSA private key whose n
has exactly nbits (default 1024) significant bits. The key
has the following attributes:
size the number of significant bits in n
ek the encryption exponent
n the product of !p and !q
!dk the decryption exponent
!p a large prime
!q another large prime
!kp, !kq, !c2
parameters derived from the other attributes,
cached to speed decryption
All the numbers in dsagen and rsagen output are in hexadeci-
mal except RSA's size, which is decimal. A public key omits
the attributes beginning with `! .' A key may have other
attributes as well, for example a service attribute identi-
fying how this key is typically used, but to these utilities
such attributes are merely comments. They can be provided
in a tag argument.
SOURCE
/appl/cmd/auth/ai2key.b
/appl/cmd/auth/dsagen.b
/appl/cmd/auth/rsagen.b
SEE ALSO
factotum(4)
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