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                         local ascii = utils.ConvertHexToAscii(s)
  79                         local hashed = core.iso14443b_crc(ascii)
  80                         return utils.ConvertAsciiToHex(hashed)
  81                 end
  82                 return nil
  83         end,
  84
  85         ------------ CRC-16 ccitt checksums
  86         -- Takes a hex string and calculates a crc16
  87         Crc16 = 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.crc16(asc)
  94                         return hash
  95                 end
  96                 return nil
  97         end,
  98
  99         ------------ CRC-64 ecma checksums
 100         -- Takes a hex string and calculates a crc64 ecma
 101         Crc64 = 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.crc64(asc)
 108                         return hash
 109                 end
 110                 return nil
 111         end,
 112
 113         ------------ SHA1 hash
 114         -- Takes a string and calculates a SHA1 hash
 115         Sha1 = function(s)
 116                 if s == nil then return nil end
 117                 if #s == 0 then return nil end
 118                 if  type(s) == 'string' then
 119                         local utils = require('utils')
 120                         --local asc = utils.ConvertHexToAscii(s)
 121                         local hash = core.sha1(s)
 122                         return hash
 123                 end
 124                 return nil
 125         end,
 126         -- Takes a hex string and calculates a SHA1 hash
 127         Sha1Hex = function(s)
 128                 if s == nil then return nil end
 129                 if #s == 0 then return nil end
 130                 if  type(s) == 'string' then
 131                         local utils = require('utils')
 132                         local asc = utils.ConvertHexToAscii(s)
 133                         local hash = core.sha1(asc)
 134                         return hash
 135                 end
 136                 return nil
 137         end,
 138
 139
 140         -- input parameter is a string
 141         -- Swaps the endianess and returns a number,
 142         -- IE:  'cd7a' -> '7acd'  -> 0x7acd
 143         SwapEndianness = function(s, len)
 144                 if s == nil then return nil end
 145                 if #s == 0 then return '' end
 146                 if  type(s) ~= 'string' then return nil end
 147
 148                 local retval = 0
 149                 if len == 16 then
 150                         local t = s:sub(3,4)..s:sub(1,2)
 151                         retval = tonumber(t,16)
 152                 elseif len == 24 then
 153                         local t = s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
 154                         retval = tonumber(t,16)
 155                 elseif len == 32 then
 156                         local t = s:sub(7,8)..s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
 157                         retval = tonumber(t,16)
 158                 end
 159                 return retval
 160         end,
 161
 162         -- input parameter is a string
 163         -- Swaps the endianess and returns a string,
 164         -- IE:  'cd7a' -> '7acd'  -> 0x7acd
 165         SwapEndiannessStr = function(s, len)
 166                 if s == nil then return nil end
 167                 if #s == 0 then return '' end
 168                 if  type(s) ~= 'string' then return nil end
 169
 170                 local retval
 171                 if len == 16 then
 172                         retval = s:sub(3,4)..s:sub(1,2)
 173                 elseif len == 24 then
 174                         retval = s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
 175                 elseif len == 32 then
 176                         retval = s:sub(7,8)..s:sub(5,6)..s:sub(3,4)..s:sub(1,2)
 177                 end
 178                 return retval
 179         end,
 180         ------------ CONVERSIONS
 181
 182         --
 183         -- Converts DECIMAL to HEX
 184     ConvertDecToHex = function(IN)
 185                 local B,K,OUT,I,D=16,"0123456789ABCDEF","",0
 186                 while IN>0 do
 187                         I=I+1
 188                         IN , D = math.floor(IN/B), math.modf(IN,B)+1
 189                         OUT = string.sub(K,D,D)..OUT
 190                 end
 191                 return OUT
 192         end,
 193         ---
 194         -- Convert Byte array to string of hex
 195         ConvertBytesToHex = function(bytes)
 196                 if bytes == nil then return '' end
 197                 if #bytes == 0 then return '' end
 198                 local s={}
 199                 for i = 1, #bytes do
 200                         s[i] = string.format("%02X",bytes[i])
 201                 end
 202                 return table.concat(s)
 203         end,
 204         -- Convert byte array to string with ascii
 205     ConvertBytesToAscii = function(bytes)
 206                 if bytes == nil then return '' end
 207                 if #bytes == 0 then return '' end
 208                 local s={}
 209                 for i = 1, #(bytes) do
 210                         s[i] = string.char(bytes[i])
 211                 end
 212                 return table.concat(s)
 213         end,
 214         ConvertHexToBytes = function(s)
 215                 local t={}
 216                 if s == nil then return t end
 217                 if #s == 0 then return t end
 218                 for k in s:gmatch"(%x%x)" do
 219                         table.insert(t,tonumber(k,16))
 220                 end
 221                 return t
 222         end,
 223         ConvertAsciiToBytes = function(s, reverse)
 224                 local t = {}
 225                 if s == nil then return t end
 226                 if #s == 0 then return t end
 227
 228                 for k in s:gmatch"(.)" do
 229                         table.insert(t, string.byte(k))
 230                 end
 231
 232                 if not reverse then
 233                         return t
 234                 end
 235
 236                 local rev = {}
 237                 if reverse then
 238                         for i = #t, 1,-1 do
 239                                 table.insert(rev, t[i] )
 240                         end
 241                 end
 242                 return rev
 243         end,
 244
 245         ConvertHexToAscii = function(s)
 246                 if s == nil then return '' end
 247                 if #s == 0 then return '' end
 248                 local t={}
 249                 for k in s:gmatch"(%x%x)" do
 250                         table.insert(t, string.char(tonumber(k,16)))
 251                 end
 252                 return table.concat(t)
 253         end,
 254
 255         ConvertAsciiToHex = function(s)
 256                 if s == nil then return '' end
 257                 if #s == 0 then return '' end
 258                 local t={}
 259                 for k in s:gmatch"(.)" do
 260                         table.insert(t, string.format("%02X", string.byte(k)))
 261                 end
 262                 return table.concat(t)
 263         end,
 264
 265         Chars2num = function(s)
 266         return (s:byte(1)*16777216)+(s:byte(2)*65536)+(s:byte(3)*256)+(s:byte(4))
 267         end,
 268
 269         -- use length of string to determine 8,16,32,64 bits
 270         bytes_to_int = function(str,endian,signed)
 271                 local t={str:byte(1,-1)}
 272                 if endian=="big" then --reverse bytes
 273                         local tt={}
 274                         for k=1,#t do
 275                                 tt[#t-k+1]=t[k]
 276                         end
 277                         t=tt
 278                 end
 279                 local n=0
 280                 for k=1,#t do
 281                         n=n+t[k]*2^((k-1)*8)
 282                 end
 283                 if signed then
 284                         n = (n > 2^(#t*8-1) -1) and (n - 2^(#t*8)) or n -- if last bit set, negative.
 285                 end
 286                 return n
 287         end,
 288
 289         -- function convertStringToBytes(str)
 290         -- local bytes = {}
 291         -- local strLength = string.len(str)
 292         -- for i=1,strLength do
 293                 -- table.insert(bytes, string.byte(str, i))
 294         -- end
 295
 296         -- return bytes
 297 -- end
 298
 299 -- function convertBytesToString(bytes)
 300         -- local bytesLength = table.getn(bytes)
 301         -- local str = ""
 302         -- for i=1,bytesLength do
 303                 -- str = str .. string.char(bytes[i])
 304         -- end
 305
 306         -- return str
 307 -- end
 308
 309 -- function convertHexStringToBytes(str)
 310         -- local bytes = {}
 311         -- local strLength = string.len(str)
 312         -- for k=2,strLength,2 do
 313                 -- local hexString = "0x" .. string.sub(str, (k - 1), k)
 314                 -- table.insert(bytes, hex.to_dec(hexString))
 315         -- end
 316
 317         -- return bytes
 318 -- end
 319
 320 -- function convertBytesToHexString(bytes)
 321         -- local str = ""
 322         -- local bytesLength = table.getn(bytes)
 323         -- for i=1,bytesLength do
 324                 -- local hexString = string.sub(hex.to_hex(bytes[i]), 3)
 325                 -- if string.len(hexString) == 1 then
 326                         -- hexString = "0" .. hexString
 327                 -- end
 328                 -- str = str .. hexString
 329         -- end
 330
 331         -- return str
 332 -- end
 333
 334 }
 335 return Utils