DOVEADM-PW(1)							      Dovecot							     DOVEADM-PW(1)

NAME

       doveadm-pw - Dovecot's password hash generator

SYNOPSIS

       doveadm [-Dv] pw -l
       doveadm [-Dv] pw [-p password] [-r rounds] [-s scheme] [-u user] [-V]
       doveadm [-Dv] pw -t hash [-u user]

DESCRIPTION

       doveadm pw is used to generate password hashes for different password schemes and optionally verify the generated hash.

       All  generated  password  hashes  have  a {scheme} prefix, for example {SHA512-CRYPT.HEX}.  All passdbs have a default scheme for passwords
       stored without the {scheme} prefix.  The default scheme can be overridden by storing the password with the scheme prefix.

OPTIONS

       Global doveadm(1) options:

       -D     Enables verbosity and debug messages.

       -v     Enables verbosity, including progress counter.

       Command specific options:

       -l     List all supported password schemes and exit successfully.
	      There are up to three optional password schemes: BLF-CRYPT (Blowfish  crypt),  SHA256-CRYPT and  SHA512-CRYPT.   Their  availability
	      depends on the system's currently used libc.

       -p password
	      The  plain  text password for which the hash should be generated.  If no password was given doveadm(1) will prompt interactively for
	      one.

       -r rounds
	      The password schemes BLF-CRYPT, SHA256-CRYPT and SHA512-CRYPT supports a variable number of encryption rounds.  The following  table
	      shows  the  minimum/maximum number of encryption rounds per scheme.  When the -r option was omitted the default number of encryption
	      rounds will be applied.

	       Scheme	    | Minimum | Maximum   | Default
	      ----------------------------------------------
	       BLF-CRYPT    |	    4 |        31 |	  5
	       SHA256-CRYPT |	 1000 | 999999999 |    5000
	       SHA512-CRYPT |	 1000 | 999999999 |    5000

       -s scheme
	      The password scheme which should be used to generate the hashed password.  By default the CRAM-MD5 scheme will be used.  It is  also
	      possible to append an encoding suffix to the scheme.  Supported encoding suffixes are: .b64, .base64 and .hex.
	      See also http://wiki2.dovecot.org/Authentication/PasswordSchemes for more details about password schemes.

       -t hash
	      Test if the given password hash matches a given plain text password.

       -u user
	      When  the  DIGEST-MD5 scheme  is used, also the 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

       -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.

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@exam-
       ple.com.

       doveadm pw -s digest-md5 -u jane.roe@example.com
       Enter new password:
       Retype new password:
       {DIGEST-MD5}9b9dcb4466233a9307bbc33708dffda0
       doveadm pw
       Enter new password:
       Retype new password:
       {CRAM-MD5}913331d8782236a8ecba7764a63aa27b26437fd40ca878d887f11d81245c2c6b

REPORTING BUGS

       Report bugs, including doveconf -n output, to the Dovecot Mailing List <dovecot@dovecot.org>.  Information about reporting bugs	is  avail-
       able at: http://dovecot.org/bugreport.html

SEE ALSO

       doveadm(1)

Dovecot v2.1							    2012-02-13							     DOVEADM-PW(1)