proxmark3/client/scripts/calc_ev1_it.lua

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local bin = require('bin')
local getopt = require('getopt')
local lib14a = require('read14a')
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local utils = require('utils')
copyright = ''
author = "Iceman"
version = 'v1.0.0'
desc = [[
This script calculates mifare Ultralight-EV1 pwd based on uid diversification for an Italian ticketsystem
Algo not found by me.
]]
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example =[[
-- if called without, it reads tag uid
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script run calc_ev1_it
--
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script run calc_ev1_it -u 11223344556677
]]
usage = [[
script run calc_ev1_it -h -u <uid> "
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Arguments:
-h : this help
-u <UID> : UID
]]
local DEBUG = true
local bxor = bit32.bxor
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---
-- A debug printout-function
local function dbg(args)
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if not DEBUG then return end
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if type(args) == "table" then
local i = 1
while args[i] do
dbg(args[i])
i = i+1
end
else
print("###", args)
end
end
---
-- This is only meant to be used when errors occur
local function oops(err)
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print("ERROR: ",err)
return nil,err
end
---
-- Usage help
local function help()
print(copyright)
print(author)
print(version)
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print(desc)
print("Example usage")
print(example)
end
--
-- Exit message
function exitMsg(msg)
print( string.rep('--',20) )
print( string.rep('--',20) )
print(msg)
print()
end
local _xortable = {
--[[ position, 4byte xor
--]]
{"00","4f2711c1"},
{"01","07D7BB83"},
{"02","9636EF07"},
{"03","B5F4460E"},
{"04","F271141C"},
{"05","7D7BB038"},
{"06","636EF871"},
{"07","5F4468E3"},
{"08","271149C7"},
{"09","D7BB0B8F"},
{"0A","36EF8F1E"},
{"0B","F446863D"},
{"0C","7114947A"},
{"0D","7BB0B0F5"},
{"0E","6EF8F9EB"},
{"0F","44686BD7"},
{"10","11494fAF"},
{"11","BB0B075F"},
{"12","EF8F96BE"},
{"13","4686B57C"},
{"14","1494F2F9"},
{"15","B0B07DF3"},
{"16","F8F963E6"},
{"17","686B5FCC"},
{"18","494F2799"},
{"19","0B07D733"},
{"1A","8F963667"},
{"1B","86B5F4CE"},
{"1C","94F2719C"},
{"1D","B07D7B38"},
{"1E","F9636E70"},
{"1F","6B5F44E0"},
}
local function findEntryByUid( uid )
-- xor UID4,UID5,UID6,UID7
-- mod 0x20 (dec 32)
local pos = (bxor(uid[4], uid[5], uid[6], uid[7])) % 32
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-- convert to hexstring
pos = string.format('%02X', pos)
for k, v in pairs(_xortable) do
if ( v[1] == pos ) then
return utils.ConvertHexToBytes(v[2])
end
end
return nil
end
---
-- create pwd
local function pwdgen(uid)
-- PWD CALC
-- PWD0 = T0 xor B xor C xor D
-- PWD1 = T1 xor A xor C xor E
-- PWD2 = T2 xor A xor B xor F
-- PWD3 = T3 xor G
local uidbytes = utils.ConvertHexToBytes(uid)
local entry = findEntryByUid(uidbytes)
if entry == nil then return nil, "Can't find a xor entry" end
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local pwd0 = bxor( entry[1], uidbytes[2], uidbytes[3], uidbytes[4])
local pwd1 = bxor( entry[2], uidbytes[1], uidbytes[3], uidbytes[5])
local pwd2 = bxor( entry[3], uidbytes[1], uidbytes[2], uidbytes[6])
local pwd3 = bxor( entry[4], uidbytes[7])
return string.format('%02X%02X%02X%02X', pwd0, pwd1, pwd2, pwd3)
end
--
-- main
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local function main(args)
print( string.rep('--',20) )
print( string.rep('--',20) )
print()
local uid = '04111211121110'
local useUID = false
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-- Arguments for the script
for o, a in getopt.getopt(args, 'hu:') do
if o == "h" then return help() end
if o == "u" then uid = a; useUID = true end
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end
if useUID then
-- uid string checks
if uid == nil then return oops('empty uid string') end
if #uid == 0 then return oops('empty uid string') end
if #uid ~= 14 then return oops('uid wrong length. Should be 7 hex bytes') end
else
-- GET TAG UID
local tag, err = lib14a.read(false, true)
if not tag then return oops(err) end
core.clearCommandBuffer()
uid = tag.uid
end
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print('UID | '..uid)
local pwd, err = pwdgen(uid)
if not pwd then return ooops(err) end
print(string.format('PWD | %s', pwd))
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end
main(args)