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# SEGA Genesis & Mega Drive Classics (0.1a)
# script for QuickBMS http://quickbms.aluigi.org

comtype lzss

idstring "PSCD"
idstring "\x71\x89\x53\x12"
get PSCD_SIZE long
get PSCD_ZSIZE long
get KEY1 long
math KEY1 ^= 0x75a3bd72
math KEY2 = 0

math OFFSET = 0x2c

math SIZE = 0x30
log MEMORY_FILE OFFSET SIZE
math OFFSET += SIZE
callfunction DECRYPT 1
getdstring NAME SIZE MEMORY_FILE
print "%NAME%"

math OFFSET += 4

get SIZE asize
math SIZE -= OFFSET
log MEMORY_FILE OFFSET SIZE
callfunction DECRYPT 1

clog MEMORY_FILE 0 PSCD_ZSIZE PSCD_SIZE MEMORY_FILE

string NAME += ".bin"
encryption swap 16
log NAME 0 PSCD_SIZE MEMORY_FILE

startfunction DECRYPT
    set KEY binary "\x6B\xC3\xC7\x6B\x83\xBB\x83\xC7\xC5\xBB\xD1\xAB\x2B"
    math ECX = KEY1
    math ARG2 = KEY2
    for i = 0 < SIZE
        math ARG2 %= 0xd
        getvarchr EAX KEY ARG2
        math ARG2 += 3
        math ECX l= 3
        math EAX += 0x17
        math EAX >>= 1

        math EDX = ECX
        math EDX &= 0x7
        math EDX += EAX

        math EBX = ECX
        math EBX &= 1
        math EBX -= EAX

        math EDX ^= EBX

        math EBX = ECX
        math EBX &= 7
        math EDX &= 0xf
        math EBX += EAX

        math EDX ^= EBX
        getvarchr TMP MEMORY_FILE i
        math TMP ^= EDX
        putvarchr MEMORY_FILE i TMP
    next i
endfunction