kks data validator

#1 imul ecx, 1000193h
#2 movsx eax, al
#3 inc edi
#4 xor ecx, eax
#5 mov al, [edi]
#6 test al, al
#7 jnz short 17354d0h   #1

EAX - Accumulator - I/O port access, arithmetic, interrupt calls, etc
EBX - Base        - pointer for memory access, some interrupt return values
ECX - Counter     - loop counter and shifts, some interrupt values
EDX - Data        - I/O port access, arithmetic, some interrupt calls
CF  - Carry       -
PF  - Parity      -
SF  - Sign        -
OF  - Overflow    -

imul ecx, asdf
  signed multiply ASDF into ECX
  AL * byte = AX
  AX * word = DX:AX
  EAX*dword = EDX:EAX
  ecx_from CPSO    ecx_to   CPSO
1 811C9DC5 0100 => 050C5D1F 1001
2 050C5D64 0100 => 5677046C 1001
3 5677044E 0100 => 6B5BC6CA 1001
4 6B5BC6BE 0100 => BF79DD1A 1011
5 BF79DD45 0100 => B1D7539F 1111
6 B1D753FC 0000 => F1F935B4 1111
7 F1F935D5 0000 => C04FBE4F 1011
8 C04FBE3C 0100 => F9887874 1011
# DETERMINED USAGE:
  randomize ecx

movsx eax, al
  MOV with sign extend
  copy al to eax
  al is smaller than eax
  eax must be a register
  al can be register or mem loc
  eax and al are considered signed
1 1597b => 7b
2    22 => 22
3    74 => 74
4    5f => 5f
5    63 => 63
6    61 => 61
7    73 => 73
8    74 => 74
# DETERMINED USAGE:
  chomp EAX to LSB

inc edi
1 31D4EC68 => 31D4EC69
2 31D4EC69 => 31D4EC6A
3 31D4EC6A => 31D4EC6B
4 increasing linearly
# DETERMINED USAGE:
  pointer to memory location

xor ecx, eax
  XOR EAX into ECX
1 050C5D1F ^= 0000007B = 050C5D64
2 5677046C ^= 00000022 = 5677044E
3 6B5BC6CA ^= 00000074 = 6B5BC6BE
4 BF79DD1A ^= 0000005F = BF79DD45
5 B1D7539F ^= 00000063 = B1D753FC
6 F1F935B4 ^= 00000061 = F1F935D5
7 C04FBE4F ^= 00000073 = C04FBE3C
8 F9887874 ^= 00000074 = F9887800
# DETERMINED USAGE:
  shitty crypto

mov al, [edi]
  copy value at EDI into AL (EAX)
1 0000007B => 00000022
2 00000022 => 00000074
3 0000005F
4 00000063
5 00000061
6 00000073
7 00000074
8 00000022

test al, al
  AL AND AL


jnz short