doveadm-pw man page on Oracle

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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 [-p password] [-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 overrid‐
       den 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	avail‐
	      ability 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.  Sup‐
	      ported 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 pass‐
	      word.  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:
	      http://wiki2.dovecot.org/Authentication/Mechanisms/DigestMD5

       -V     When  this  option  is given, the hashed password will be inter‐
	      nally 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@example.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 available
       at: http://dovecot.org/bugreport.html

SEE ALSO
       doveadm(1)

Dovecot v2.2			  2013-08-17			 DOVEADM-PW(1)
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