NAME
pwhash —
hashes passwords from the
command line or standard input
SYNOPSIS
pwhash |
[-km]
[-b
rounds]
[-S
rounds]
[-s salt]
[-p |
string] |
DESCRIPTION
pwhash prints the encrypted form of
string to the standard output. This is mostly useful for
encrypting passwords from within scripts.
The options are as follows:
-
-
- -b
rounds
- Encrypt the string using Blowfish hashing with the
specified rounds.
-
-
- -k
- Run in
makekey(8) compatible mode.
A single combined key (eight chars) and salt (two chars) with no
intermediate space are read from standard input and the DES encrypted
result is written to standard output without a terminating newline.
-
-
- -m
- Hash the string using MD5.
-
-
- -p
- Prompt for a single string with echo turned off.
-
-
- -S
rounds
- Encrypt the salt with HMAC-SHA1 using the password as key
and the specified rounds as a hint for the number of
iterations.
-
-
- -s
salt
- Encrypt the string using DES, with the specified
salt.
If no
string is specified,
pwhash reads
one string per line from standard input, encrypting each one with the chosen
algorithm from above. In the event that no specific algorithm is given as a
command line option, the algorithm specified in the default class in
/etc/passwd.conf will be used.
For MD5 and Blowfish a new random salt is automatically generated for each
password.
Specifying the
string on the command line should be
discouraged; using the standard input is more secure.
FILES
- /etc/passwd.conf
-
SEE ALSO
crypt(3),
passwd.conf(5)