Provided by: dovecot-core_2.2.22-1ubuntu2_amd64 bug


       doveadm-pw - Dovecot's password hash generator


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


       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.


       Global doveadm(1) options:

       -D     Enables verbosity and debug messages.

       -o setting=value
              Overrides the configuration setting from  /etc/dovecot/dovecot.conf  and  from  the
              userdb with the given value.  In order to override multiple settings, the -o option
              may be specified multiple times.

       -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
              See  also for more details
              about password schemes.

       -t hash
              Test if the given password hash matches a given plain text  password.   You  should
              enclose the password hash in single quotes, if it contains one or more dollar signs
              ($).  The plain text password may be passed using the -p option.  When no  password
              was specified, doveadm(1) will prompt interactively for one.

       -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:

       -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


       The  first  password  hash  is  a  DIGEST-MD5  hash  for  The second
       password hash is a CRAM-MD5 hash for

       doveadm pw -s digest-md5 -u
       Enter new password:
       Retype new password:
       doveadm pw
       Enter new password:
       Retype new password:


       Report   bugs,   including   doveconf   -n   output,   to   the   Dovecot   Mailing   List
       <>.     Information    about    reporting   bugs   is   available   at: