Ubuntu Manpage: hpavkeys - HomePlug AV Key Generator

Provided by: plc-utils-extra_0.0.6+git20211210.358dfcf-2_amd64

NAME

       hpavkeys - HomePlug AV Key Generator

SYNOPSIS

       hpavkeys [options] file [file] [...]

DESCRIPTION

       Convert  blocks  of  phrases  to encrypted HomePlug AV keys.  Phrases are read from one or
       more files, converted to either Device Access Keys, Networks Membership  Keys  or  Network
       Identification  Keys  and  printed  on stdout.  By default, only keys are printed, one per
       line, but both keys and phrases can be printed, one pair per line.

       This program is part of the Qualcomm Atheros Powerline Toolkit.  See the AMP man page  for
       an overview and installation instructions.

BACKGROUND

HomePlug AV technology uses 16-byte binary values, called "keys", for various purposes
such as identity and security. Three keys of interest to users are the Device Access Key
(DAK), the Network Memership Key (NMK) and Network Identification Key (NID). Their
purpose is described in the HomePlug AV Specification.

The HomePlug AV Specification explains how to generate 16-byte binary DAK, NMK and NID
values using the SHA-256 algorithm to hash user-supplied ASCII strings, called "pass
phrases" in the specification. HomePlug AV compliant pass phrases have from 12 to 64
7-bit ASCII character values in the range 0x20 to 0x7F. In some cases, a specified 8-byte
salt is added to the pass phrase before computing the 32-byte hash value. In all cases,
the computed hash is then rehashed a specified number of times to produce the final
32-byte value. The HomePlug AV key is the lower 16-bytes of that value.

Keys can be any 16-byte binary value but binary values are difficult to remember.
HomePlug AV compliant applications, like the Qualcomm Atheros Device Manager, ask users
for a pass phrase that is converted to a 16-byte binary value using a standard hashing
algorithm. In principle, no two phrases will produce the same key and it would be
computationally expensive to derive the pass phrase given the key. Although HomePlug AV
software deals directly with the key, users need only remember the pass phrase in order to
reproduce the key.

OPTIONS

-D Uses HomePlug AV rules to compute Device Access Keys (DAK) from pass phrases read
from file or stdin. A DAK is 16 bytes expressed as 32 hexadecimal digits. This
option over-rides any -M and -N options previously specified on the command line.

-e Enforce HomePlug AV length and content rules for phrases. Non-compliant phrases
are reported and ignored. Compliant phrases are 12 to 64 7-bit ASCII characters in
the range 0x20 (SP) through 0x7F (DEL). Essentially, this includes any character
that can be typed on a standard US or UK keyboard, excluding horizontal tab (HT).
Be aware that some command shells intercept and act on special characters instead
of passing them to the application. In such cases, you may need to include meta
characters.

-L level
Set security level. The security level is encoded into the NID. Level 0 enables
pushbutton pairing. Level 1 disables it. This option has no effect unless a NID
is computed.

-M Uses HomePlug AV rules to compute Network Membership Keys (NMK) from pass phrases
read from file or stdin. An NMK is 16 bytes expressed as 32 hexadecimal
characters. This option over-rides any -D or -N options previsously specified on
the command line.

-N Uses HomePlug AV rules to compute Network Identification Keys (NID) from pass
phrases read from file or stdin. An NID is 7 bytes expressed as 14 hexadecimal
digits. This option over-rides any -D or -M options previously specified on the
command line.

-p Print the password, or pass phrase, used to generate each key after each key on
stdout. One single space seperates the pass phrase from the key string. The pass
phrase consists of all subsequent characters, including spaces, appearing up to the
end of the line. Without this option, only the keys are printed.

-q Enable quiet mode which, for this application, has no effect. This behavior has
changed from earlier program versions.

-v Enable verbose mode which, for this application, prints the input phrase after each
key. This behavior has changed from earlier program versions.

-?,--help
Print program help summary on stdout. This option takes precedence over other
options on the command line.

-!,--version
Print program version information on stdout. This option takes precedence over
other options on the command line. Use this option when sending screen dumps to
Atheros Technical Support so that they know exactly which version of the Linux
Toolkit you are using.

ARGUMENTS

       file   Any  valid  filename.   Each file on the command line is read in turn and output is
              written to stdout, much like the cat utility.  Input is read from the console  when
              no filenames are specified.

EXAMPLES

       The following command reads file example.keys and prints the SHA256 key for each phrase in
       that file.  An SHA256 key is 128 bits or 32 bytes  expressed  as  32  hexadecimal  digits.
       SHA256  keys  are  the  default  output when no key type is specified.  SHA256 is a public
       domain standard, not a HomePlug AV standard.

          # hpavkeys example.keys
          EA41A2383355FA7CA3B467DF0848A8EB9C41591BE53696C5F45DDAF621784F07
          4E76AD8354461437C04EF9B9B242540B6406D782FF2C3FB28AFDAB5B423F88FE
          71C480DF93D6AE2F1EFAD1447C66C9525E316218CF51FC8D9ED832F2DAF18B73
          7257DF11A035A49119FD881F20AA7FE88970F1A034E4BBBF2D50FAB0D0239F25
          FAC202F439E47EB5EACF6B9CC4151BF6B2B6E736A79BCAB0F589C63BCB78D16B

       The following command reads file example.keys and prints the DAK for each phrase  in  that
       file.   Input  phrases  are  checked  for  HomePlugAV  compliance  and illegal phrases are
       reported then ignored.  A legal HomePlug pass phrase is 12 to 64 characters consisting  of
       ASCII characters ' ' through '~'.  Essentially, these are the only characters that one can
       enter on a standard English keyboard.

          # hpavkeys -D example.keys
          F084B4E8F6069FF1300C9BDB812367FF
          7A6F36AC0DF1031CF04C5AF8DC0A70F0
          910B3D08D309BCE66452DBB40FDCB551
          309743236F0403C450A718494825FC02
          3C94A168BDF4BC19AA111BAB930171A5
          72D6E17E6756CD778F59FAFC6BF6D2B6
          914EB1D58AB66461A27794BFF648C04F
          7B7C094380A6E26F9F4618884C81DB63
          08AE750B07884E2C380BDCEDBC28D2C8
          F8EE1AC7F4234A3F724D21F8B837B547

       The following example reads the same file as above but prints the  NMK  for  each  phrase,
       instead  of  the DAK.  The keys printed here have different values because the HomePlug AV
       Specification requires different hash algorithms for the DAK and NMK.  Don't mix them up.

          # hpavkeys -M example.keys
          B59319D7E8157BA001B018669CCEE30D
          F2B0C7F6C355981EBDD484FF49957420
          54CB8AB1235896E45E6B643C7BF11ADB
          75CD66973ED683E041F8AC37ACA88B58
          E20A0A69A3C6326C623202D3F42AF416
          1671D61F305E81BAF000D58AF09888D5
          05EFD9C9452BF8415D84BB1C415EE52A
          56F3C7F539D4F8F5EEC00E63F11A8DEC
          9718D29451897404DA2719CB80CA2ADA
          E5A7C020E0889A0265759D80DB3F9834

       The following command reads the same file as above but prints the pass phrase because  the
       -v option is specified.  Keys are printed as 32 hex digits then one space then the phrase.
       Spaces are significant within the phrase. Printed phrases start in column 34 and  continue
       to the end of the line.

          # hpavkeys -M example.keys -v
          B59319D7E8157BA001B018669CCEE30D HomePlugAV0123
          F2B0C7F6C355981EBDD484FF49957420 01234567890123456789
          54CB8AB1235896E45E6B643C7BF11ADB abcdefghijklmnopqrstuvwxyz
          75CD66973ED683E041F8AC37ACA88B58    I     love     my    dog   .
          E20A0A69A3C6326C623202D3F42AF416 A.B.C.D.E.F.G.H.I.J.K.L.M.N.O.P.Q.R.S.T.U.V.W.X.Y.Z
          1671D61F305E81BAF000D58AF09888D5 ~!@#$%^&*()_-`{}[]":;'<>./?
          05EFD9C9452BF8415D84BB1C415EE52A QWRT-YPSD-FGHJ-KLZX
          56F3C7F539D4F8F5EEC00E63F11A8DEC The quick brown fox jumped over the lazy dog.
          9718D29451897404DA2719CB80CA2ADA Super-Duper Electrosonic Frepitator SSEI43
          E5A7C020E0889A0265759D80DB3F9834 A = 3 * (5+2) - 1045

TIPS&TRICKS

       The  following  example illustrates an unusual case where passwords start with dash ("-").
       Program hpavkey assumes that the dash is an option prefix which is incorrect in this case.
       An error occurs because option -H is illegal.

          # hpavkey -vM -HomePlugAV -HomePlugAV123
          hpavkey: Operation canceled: Option 'H' has no meaning

       One solution is to insert the keys verbatim in a password file, in this case password.txt,
       then run program hpavkeys on that file.

          # hpavkeys -vM password.txt
          80B74B14E92A739AD41ACDC377451D1B -HomePlugAV
          1A46BDE6F75209292FDFC4CCE4D19B4E -HomePlugAV123

REFERENCES

       See the HomePlug AV Specification for more information on encryption  keys,  pass  phrases
       and hash algorithms used.  See standard FIPS180-2 sec 5.3.2 for more information on SHA256
       encoding.

DISCLAIMER

       Qualcomm Atheros reserves the right to modify program names, functionality,  input  format
       or output format in future toolkit releases without any obligation to notify or compensate
       toolkit users.

CREDITS

        Charles Maier