git.zerfleddert.de Git - proxmark3-svn/blob - client/scripts/e.lua

   1 local getopt = require('getopt')
   2 local utils = require('utils')
   3
   4 example = "script calculates many different checksums (CRC) over the provided hex input"
   5 author = "Iceman"
   6 desc =
   7 [[
   8 This script calculates many checksums (CRC) over the provided hex input.
   9
  10 Arguments:
  11         -b                              data in hex
  12         -w                              bitwidth of the CRC family of algorithm. <optional> defaults to all known CRC presets.
  13 Examples :
  14         script run e -b 010203040506070809
  15         script run e -b 010203040506070809 -w 16
  16 ]]
  17
  18 ---
  19 -- A debug printout-function
  20 function dbg(args)
  21         if DEBUG then
  22                 print("###", args)
  23         end
  24 end
  25 ---
  26 -- This is only meant to be used when errors occur
  27 function oops(err)
  28         print("ERROR: ",err)
  29         return nil,err
  30 end
  31 ---
  32 -- Usage help
  33 function help()
  34         print(desc)
  35         print("Example usage")
  36         print(example)
  37 end
  38 ---
  39 -- The main entry point
  40 function main(args)
  41
  42         local data
  43         local width = 0
  44
  45         -- Read the parameters
  46         for o, a in getopt.getopt(args, 'hb:w:') do
  47                 if o == "h" then return help() end
  48                 if o == "b" then data = a end
  49                 if o == "w" then width = a end
  50         end
  51
  52         data = data or '01020304'
  53
  54         print( string.rep('-',60) )
  55         print('Bit width of CRC | '..width)
  56         print('Bytes            | '..data)
  57         print('')
  58         print( ('%-20s| %-16s| %s'):format('Model','CRC', 'CRC reverse'))
  59         print( string.rep('-',60) )
  60         local lists = core.reveng_models(width)
  61         for _,i in pairs(lists) do
  62                 local one = core.reveng_runmodel(i, data, false, '0')
  63                 local two = core.reveng_runmodel(i, data, true, '0')
  64                 print( ('%-20s| %-16s| %s'):format(i, one:upper(), two:upper()) )
  65         end
  66 end
  67
  68 main(args)