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PWHASH(1) NetBSD General Commands Manual PWHASH(1)
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Maintained for NetBSD
by Kimmo Suominen.
Based on man-cgi by Panagiotis Christias.
pwhash -- hashes passwords from the command line or standard input
pwhash [-km] [-A variant[,params]] [-b rounds] [-S rounds] [-s salt]
[-p | string]
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:
Encrypt the string using Blowfish hashing with the specified
-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.
Encrypt the salt with HMAC-SHA1 using the password as key and the
specified rounds as a hint for the number of iterations.
Encrypt the specified string using Argon2 hashing parameterized
using variant variant, where variant is one of the following:
argon2id, argon2i, argon2d. Variant argon2id is recommended.
Following the required variant name, three optional comma-delim-
ited parameters may be provided,
t=n Specify the number of iterations to n.
m=n Specify the memory usage in KB to n.
p=n Specify the number of threads to n. This is currently
If unspecified, default parameters are calculated based on system
performance and available resources.
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
For MD5, Blowfish, and Argon2 a new random salt is automatically gener-
ated for each password.
Specifying the string on the command line should be discouraged; using
the standard input is more secure.
The following specifies the argon2id variant, using 1 thread and 4096KB
pwhash -A argon2id,p=1,m=4096 -p
NetBSD 10.99 October 20, 2021 NetBSD 10.99