.\" Copyright (c) 2010-2018 Dovecot authors, see the included COPYING file
.TH DOVEADM\-PW 1 "2015-06-05" "Dovecot v2.3" "Dovecot"
.SH NAME
doveadm\-pw \- Dovecot\(aqs password hash generator
.\"------------------------------------------------------------------------
.SH SYNOPSIS
.BR doveadm " [" \-Dv "] " "pw \-l"
.\"-------------------------------------
.br
.BR doveadm " [" \-Dv "] " pw
[\fB\-p\fP \fIpassword\fP]
[\fB\-r\fP \fIrounds\fP]
[\fB\-s\fP \fIscheme\fP]
[\fB\-u\fP \fIuser\fP]
.RB [ \-V ]
.\"-------------------------------------
.br
.BR doveadm " [" \-Dv "] " "pw \-t"
.I hash
[\fB\-p\fP \fIpassword\fP]
[\fB\-u\fP \fIuser\fP]
.\"------------------------------------------------------------------------
.SH DESCRIPTION
.B doveadm pw
is used to generate password hashes for different password
.IR scheme s
and optionally verify the generated hash.
.PP
All generated password hashes have a
.RI { scheme }
prefix, for example
.RB { SHA512\-CRYPT.HEX }.
All passdbs have a default scheme for passwords stored without the
.RI { scheme }
prefix.
The default scheme can be overridden by storing the password with the
scheme prefix.
.PP
.\"------------------------------------------------------------------------
@INCLUDE:global-options@
.\" --- command specific options --- "/.
.PP
Command specific
.IR options :
.\"-------------------------------------
.TP
.B \-l
List all supported password
.IR scheme s
and exit successfully.
.br
There are up to three optional password
.IR scheme s:
.BR BLF\-CRYPT " (Blowfish crypt),"
.BR SHA256\-CRYPT\  and
.BR SHA512\-CRYPT .
Their availability depends on the system\(aqs currently used libc.
.\"-------------------------------------
.TP
.BI \-p\  password
The plain text
.I password
for which the hash should be generated.
If no
.I password
was given
.BR doveadm (1)
will prompt interactively for one.
.\"-------------------------------------
.TP
.BI \-r\  rounds
The password
.IR scheme s
.BR BLF\-CRYPT ,
.BR SHA256\-CRYPT\  and
.B SHA512\-CRYPT
supports a variable number of encryption
.IR rounds .
The following table shows the minimum/maximum number of encryption
.I rounds
per scheme.
When the
.B \-r
option was omitted the default number of encryption rounds will be applied.
.\"
.sp
.nf
 Scheme       | Minimum | Maximum   | Default
----------------------------------------------
 BLF\-CRYPT    |       4 |        31 |       5
 SHA256\-CRYPT |    1000 | 999999999 |    5000
 SHA512\-CRYPT |    1000 | 999999999 |    5000
.fi
.\"
.\"-------------------------------------
.TP
.BI \-s\  scheme
The password
.I scheme
which should be used to generate the hashed password.
By default the
.BI CRYPT\  scheme
will be used (with the $2y$ bcrypt format).
It is also possible to append an encoding suffix to the
.IR scheme .
Supported encoding suffixes are:
.BR .b64 ,
.BR .base64\  and
.BR .hex .
.br
See also http://wiki2.dovecot.org/Authentication/PasswordSchemes for more
details about password schemes.
.\"-------------------------------------
.TP
.BI \-t\  hash
Test if the given password
.I hash
matches a given plain text password.
You should enclose the password
.I hash
in single quotes, if it contains one or more dollar signs
.RB ( $ ).
The plain text password may be passed using the
.BR \-p " option."
When no password was specified,
.BR doveadm (1)
will prompt interactively for one.
.\"-------------------------------------
.TP
.BI \-u\  user
When the
.BI DIGEST\-MD5\  scheme
is used, also the
.I user
name must be given, because the user name is a part of the generated hash.
For more information about Digest\-MD5 please read also:
http://wiki2.dovecot.org/Authentication/Mechanisms/DigestMD5
.\"-------------------------------------
.TP
.B \-V
When this option is given, the hashed password will be internally verified.
The result of the verification will be shown after the hashed password,
enclosed in parenthesis.
.\"------------------------------------------------------------------------
.SH EXAMPLE
The first password hash is a DIGEST\-MD5 hash for jane.roe@example.com.
The second password hash is a CRAM\-MD5 hash for john.doe@example.com.
.sp
.nf
.B doveadm pw \-s digest\-md5 \-u jane.roe@example.com
Enter new password:
Retype new password:
{DIGEST\-MD5}9b9dcb4466233a9307bbc33708dffda0
.B doveadm pw
Enter new password:
Retype new password:
{CRAM\-MD5}913331d8782236a8ecba7764a63aa27b26437fd40ca878d887f11d81245c2c6b
.fi
.\"------------------------------------------------------------------------
@INCLUDE:reporting-bugs@
.\"------------------------------------------------------------------------
.SH SEE ALSO
.BR doveadm (1)