1.\" $NetBSD: pwhash.1,v 1.7 2009/10/16 08:09:12 wiz Exp $ 2.\" $OpenBSD: encrypt.1,v 1.16 2000/11/09 17:52:07 aaron Exp $ 3.\" 4.\" Copyright (c) 1996, Jason Downs. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 15.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS 16.\" OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18.\" DISCLAIMED. IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, 19.\" INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 22.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25.\" SUCH DAMAGE. 26.\" 27.Dd October 16, 2009 28.Dt PWHASH 1 29.Os 30.Sh NAME 31.Nm pwhash 32.Nd hashes passwords from the command line or standard input 33.Sh SYNOPSIS 34.Nm pwhash 35.Op Fl km 36.Op Fl b Ar rounds 37.Op Fl S Ar rounds 38.Op Fl s Ar salt 39.Op Fl p | Ar string 40.Sh DESCRIPTION 41.Nm 42prints the encrypted form of 43.Ar string 44to the standard output. 45This is mostly useful for encrypting passwords from within scripts. 46.Pp 47The options are as follows: 48.Bl -tag -width Ds 49.It Fl b Ar rounds 50Encrypt the string using Blowfish hashing with the specified 51.Ar rounds . 52.It Fl k 53Run in 54.Xr makekey 8 55compatible mode. 56A single combined key (eight chars) and salt (two chars) with no 57intermediate space are read from standard input and the DES encrypted 58result is written to standard output without a terminating newline. 59.It Fl m 60Encrypt the string using MD5. 61.It Fl p 62Prompt for a single string with echo turned off. 63.It Fl S Ar rounds 64Encrypt the salt with HMAC-SHA1 using the password as key and the specified 65.Ar rounds 66as a hint for the number of iterations. 67.It Fl s Ar salt 68Encrypt the string using DES, with the specified 69.Ar salt . 70.El 71.Pp 72If no 73.Ar string 74is specified, 75.Nm 76reads one string per line from standard input, encrypting each one 77with the chosen algorithm from above. 78In the event that no specific algorithm is given as a command line option, 79the algorithm specified in the default class in 80.Pa /etc/passwd.conf 81will be used. 82.Pp 83For MD5 and Blowfish a new random salt is automatically generated for each 84password. 85.Pp 86Specifying the 87.Ar string 88on the command line should be discouraged; using the 89standard input is more secure. 90.Sh FILES 91.Bl -tag -width /etc/passwd.conf -compact 92.It Pa /etc/passwd.conf 93.El 94.Sh SEE ALSO 95.Xr crypt 3 , 96.Xr passwd.conf 5 97