MOV ECX, 3 //Encrypt Amount...
PUSH ECX

EncryptPacket:
MOV ECX, PacketSize
MOV ESI, PacketBuffer
XOR EAX, EAX

EncryptLoop1:
MOV DL, BYTE PTR DS:[ESI]
ROL DL, 3
ADD DL, CL
XOR DL, AL
MOV AL, DL
ROR DL, CL
NOT DL
ADD DL, 48
MOV BYTE PTR DS:[ESI], DL
INC ESI
DEC ECX
CMP ECX, 0
JNZ EncryptLoop1

MOV ECX, PacketSize
XOR EAX, EAX

EncryptLoop2:
DEC ESI
MOV DL, BYTE PTR DS:[ESI]
ROL DL, 4
ADD DL, CL
XOR DL, AL
MOV AL, DL
XOR DL, 13
ROR DL, 3
MOV BYTE PTR DS:[ESI], DL
DEC ECX
CMP ECX, 0
JNZ EncryptLoop2

POP ECX
DEC ECX
CMP ECX, 0
PUSH ECX

JNZ EncryptPacket