git.zerfleddert.de Git - proxmark3-svn/blob - client/lualibs/utils.lua

   1 --[[
   2         This may be moved to a separate library at some point (Holiman)
   3 --]]
   4 local Utils =
   5 {
   6         -- Asks the user for Yes or No
   7         confirm = function(message, ...)
   8                 local answer
   9                 message = message .. " [y/n] ?"
  10                 repeat
  11                         io.write(message)
  12                         io.flush()
  13                         answer=io.read()
  14                         if answer == 'Y' or answer == "y" then
  15                                 return true
  16                         elseif answer == 'N' or answer == 'n' then
  17                                 return false
  18                         end
  19                 until false
  20         end,
  21         ---
  22         -- Asks the user for input
  23         input = function (message , default)
  24                 local answer
  25                 if default ~= nil then
  26                         message = message .. " (default: ".. default.. " )"
  27                 end
  28                 message = message .." \n > "
  29                 io.write(message)
  30                 io.flush()
  31                 answer=io.read()
  32                 if answer == '' then answer = default end
  33
  34                 return answer
  35         end,
  36
  37         ------------ FILE READING
  38         ReadDumpFile = function (filename)
  39
  40                 filename = filename or 'dumpdata.bin'
  41                 if #filename == 0 then
  42                         return nil, 'Filename length is zero'
  43                 end
  44
  45                 infile = io.open(filename, "rb")
  46                 if infile == nil then
  47                         return nil, string.format("Could not read file %s",filename)
  48                 end
  49                 local t = infile:read("*all")
  50                 len = string.len(t)
  51                 local  _,hex = bin.unpack(("H%d"):format(len),t)
  52                 io.close(infile)
  53                 return hex
  54         end,
  55
  56         ------------ string split function
  57         Split = function( inSplitPattern, outResults )
  58                 if not outResults then
  59                         outResults = {}
  60                 end
  61                 local start = 1
  62                 local splitStart, splitEnd = string.find( self, inSplitPattern, start )
  63                 while splitStart do
  64                         table.insert( outResults, string.sub( self, start, splitStart-1 ) )
  65                         start = splitEnd + 1
  66                         splitStart, splitEnd = string.find( self, inSplitPattern, start )
  67                 end
  68                 table.insert( outResults, string.sub( self, start ) )
  69                 return outResults
  70         end,
  71
  72         ----ISO14443-B CRC
  73         Crc14b = function(s)
  74                 if s == nil then return nil end
  75                 if #s == 0 then return nil end
  76                 if  type(s) == 'string' then
  77                         local utils = require('utils')
  78                         return utils.ConvertAsciiToHex(
  79                                                         core.iso14443b_crc(s)
  80                                                         )
  81                 end
  82                 return nil
  83         end,
  84
  85         ------------ CRC-8 Legic checksums
  86         -- Takes a hex string and calculates a crc8
  87         Crc8Legic = function(s)
  88                 if s == nil then return nil end
  89                 if #s == 0 then return nil end
  90                 if  type(s) == 'string' then
  91                         local utils = require('utils')
  92                         local asc = utils.ConvertHexToAscii(s)
  93                         local hash = core.crc8legic(asc)
  94                         return hash
  95                 end
  96                 return nil
  97         end,
  98
  99         ------------ CRC-16 ccitt checksums
 100         -- Takes a hex string and calculates a crc16
 101         Crc16 = function(s)
 102                 if s == nil then return nil end
 103                 if #s == 0 then return nil end
 104                 if  type(s) == 'string' then
 105                         local utils = require('utils')
 106                         local asc = utils.ConvertHexToAscii(s)
 107                         local hash = core.crc16(asc)
 108                         return hash
 109                 end
 110                 return nil
 111         end,
 112
 113
 114         ------------ CRC-64 ecma checksums
 115         -- Takes a hex string and calculates a crc64 ecma
 116         Crc64 = function(s)
 117                 if s == nil then return nil end
 118                 if #s == 0 then return nil end
 119                 if  type(s) == 'string' then
 120                         local utils = require('utils')
 121                         local asc = utils.ConvertHexToAscii(s)
 122                         local hash = core.crc64(asc)
 123                         return hash
 124                 end
 125                 return nil
 126         end,
 127
 128         ------------ SHA1 hash
 129         -- Takes a string and calculates a SHA1 hash
 130         Sha1 = function(s)
 131                 if s == nil then return nil end
 132                 if #s == 0 then return nil end
 133                 if  type(s) == 'string' then
 134                         local utils = require('utils')
 135                         --local asc = utils.ConvertHexToAscii(s)
 136                         local hash = core.sha1(s)
 137                         return hash
 138                 end
 139                 return nil
 140         end,
 141         -- Takes a hex string and calculates a SHA1 hash
 142         Sha1Hex = function(s)
 143                 if s == nil then return nil end
 144                 if #s == 0 then return nil end
 145                 if  type(s) == 'string' then
 146                         local utils = require('utils')
 147                         local asc = utils.ConvertHexToAscii(s)
 148                         local hash = core.sha1(asc)
 149                         return hash
 150                 end
 151                 return nil
 152         end,
 153
 154
 155         -- input parameter is a string
 156         -- Swaps the endianess and returns a number,
 157         -- IE:  'cd7a' -> '7acd'  -> 0x7acd
 158         SwapEndianness = function(s, len)
 159                 if s == nil then return nil end
 160                 if #s == 0 then return '' end
 161                 if  type(s) ~= 'string' then return nil end
 162
 163                 local retval = 0
 164                 if len == 16 then
 165                         local t = s:sub(3,4)..s:sub(1,2)
 166                         retval = tonumber(t,16)
 167                 elseif len == 24 then
 168                         local t = s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
 169                         retval = tonumber(t,16)
 170                 elseif len == 32 then
 171                         local t = s:sub(7,8)..s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
 172                         retval = tonumber(t,16)
 173                 end
 174                 return retval
 175         end,
 176
 177         -- input parameter is a string
 178         -- Swaps the endianess and returns a string,
 179         -- IE:  'cd7a' -> '7acd'  -> 0x7acd
 180         SwapEndiannessStr = function(s, len)
 181                 if s == nil then return nil end
 182                 if #s == 0 then return '' end
 183                 if  type(s) ~= 'string' then return nil end
 184
 185                 local retval
 186                 if len == 16 then
 187                         retval = s:sub(3,4)..s:sub(1,2)
 188                 elseif len == 24 then
 189                         retval = s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
 190                 elseif len == 32 then
 191                         retval = s:sub(7,8)..s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
 192                 end
 193                 return retval
 194         end,
 195         ------------ CONVERSIONS
 196
 197         --
 198         -- Converts DECIMAL to HEX
 199     ConvertDecToHex = function(IN)
 200                 local B,K,OUT,I,D=16,"0123456789ABCDEF","",0
 201                 while IN>0 do
 202                         I=I+1
 203                         IN , D = math.floor(IN/B), math.modf(IN,B)+1
 204                         OUT = string.sub(K,D,D)..OUT
 205                 end
 206                 return OUT
 207         end,
 208         ---
 209         -- Convert Byte array to string of hex
 210         ConvertBytesToHex = function(bytes)
 211                 if bytes == nil then return '' end
 212                 if #bytes == 0 then return '' end
 213                 local s={}
 214                 for i = 1, #bytes do
 215                         s[i] = string.format("%02X",bytes[i])
 216                 end
 217                 return table.concat(s)
 218         end,
 219         -- Convert byte array to string with ascii
 220     ConvertBytesToAscii = function(bytes)
 221                 if bytes == nil then return '' end
 222                 if #bytes == 0 then return '' end
 223                 local s={}
 224                 for i = 1, #(bytes) do
 225                         s[i] = string.char(bytes[i])
 226                 end
 227                 return table.concat(s)
 228         end,
 229         ConvertHexToBytes = function(s)
 230                 local t={}
 231                 if s == nil then return t end
 232                 if #s == 0 then return t end
 233                 for k in s:gmatch"(%x%x)" do
 234                         table.insert(t,tonumber(k,16))
 235                 end
 236                 return t
 237         end,
 238         ConvertAsciiToBytes = function(s, reverse)
 239                 local t = {}
 240                 if s == nil then return t end
 241                 if #s == 0 then return t end
 242
 243                 for k in s:gmatch"(.)" do
 244                         table.insert(t, string.byte(k))
 245                 end
 246
 247                 if not reverse then
 248                         return t
 249                 end
 250
 251                 local rev = {}
 252                 if reverse then
 253                         for i = #t, 1,-1 do
 254                                 table.insert(rev, t[i] )
 255                         end
 256                 end
 257                 return rev
 258         end,
 259
 260         ConvertHexToAscii = function(s)
 261                 if s == nil then return '' end
 262                 if #s == 0 then return '' end
 263                 local t={}
 264                 for k in s:gmatch"(%x%x)" do
 265                         table.insert(t, string.char(tonumber(k,16)))
 266                 end
 267                 return table.concat(t)
 268         end,
 269
 270         ConvertAsciiToHex = function(s)
 271                 if s == nil then return '' end
 272                 if #s == 0 then return '' end
 273                 local t={}
 274                 for k in s:gmatch"(.)" do
 275                         table.insert(t, string.format("%02X", string.byte(k)))
 276                 end
 277                 return table.concat(t)
 278         end,
 279
 280         Chars2num = function(s)
 281         return (s:byte(1)*16777216)+(s:byte(2)*65536)+(s:byte(3)*256)+(s:byte(4))
 282         end,
 283
 284         -- use length of string to determine 8,16,32,64 bits
 285         bytes_to_int = function(str,endian,signed)
 286                 local t={str:byte(1,-1)}
 287                 if endian=="big" then --reverse bytes
 288                         local tt={}
 289                         for k=1,#t do
 290                                 tt[#t-k+1]=t[k]
 291                         end
 292                         t=tt
 293                 end
 294                 local n=0
 295                 for k=1,#t do
 296                         n=n+t[k]*2^((k-1)*8)
 297                 end
 298                 if signed then
 299                         n = (n > 2^(#t*8-1) -1) and (n - 2^(#t*8)) or n -- if last bit set, negative.
 300                 end
 301                 return n
 302         end,
 303
 304         -- a simple implementation of a sleep command. Thanks to Mosci
 305         -- takes number of seconds to sleep
 306         Sleep = function(n)
 307                 local clock = os.clock
 308                 local t0 = clock()
 309                 while clock() - t0 <= n do end
 310                 return nil
 311         end,
 312
 313         -- function convertStringToBytes(str)
 314         -- local bytes = {}
 315         -- local strLength = string.len(str)
 316         -- for i=1,strLength do
 317                 -- table.insert(bytes, string.byte(str, i))
 318         -- end
 319
 320         -- return bytes
 321 -- end
 322
 323 -- function convertBytesToString(bytes)
 324         -- local bytesLength = table.getn(bytes)
 325         -- local str = ""
 326         -- for i=1,bytesLength do
 327                 -- str = str .. string.char(bytes[i])
 328         -- end
 329
 330         -- return str
 331 -- end
 332
 333 -- function convertHexStringToBytes(str)
 334         -- local bytes = {}
 335         -- local strLength = string.len(str)
 336         -- for k=2,strLength,2 do
 337                 -- local hexString = "0x" .. string.sub(str, (k - 1), k)
 338                 -- table.insert(bytes, hex.to_dec(hexString))
 339         -- end
 340
 341         -- return bytes
 342 -- end
 343
 344 -- function convertBytesToHexString(bytes)
 345         -- local str = ""
 346         -- local bytesLength = table.getn(bytes)
 347         -- for i=1,bytesLength do
 348                 -- local hexString = string.sub(hex.to_hex(bytes[i]), 3)
 349                 -- if string.len(hexString) == 1 then
 350                         -- hexString = "0" .. hexString
 351                 -- end
 352                 -- str = str .. hexString
 353         -- end
 354
 355         -- return str
 356 -- end
 357
 358 }
 359 return Utils