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mame/attic/fd1094dp.cpp

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// license:BSD-3-Clause
// copyright-holders:Charles MacDonald, Nicola Salmoria
/*****************************************************************************
FD1094 key dumper
This file is not part of MAME, it is a standalone program that reads 128MB of
data extracted from the FD1094 CPU and produces a 8KB keyfile, used by
fd1094.c to decrypt the ROM data.
*****************************************************************************/
#include <cstdio>
#include <cstring>
#include <cstdlib>
int state2;
char srcpath[250],dstfilename[250];
#define BIT(x,n) (((x)>>(n))&1)
#define bitswap<16>(val,B15,B14,B13,B12,B11,B10,B9,B8,B7,B6,B5,B4,B3,B2,B1,B0) \
((BIT(val,B15) << 15) | \
(BIT(val,B14) << 14) | \
(BIT(val,B13) << 13) | \
(BIT(val,B12) << 12) | \
(BIT(val,B11) << 11) | \
(BIT(val,B10) << 10) | \
(BIT(val, B9) << 9) | \
(BIT(val, B8) << 8) | \
(BIT(val, B7) << 7) | \
(BIT(val, B6) << 6) | \
(BIT(val, B5) << 5) | \
(BIT(val, B4) << 4) | \
(BIT(val, B3) << 3) | \
(BIT(val, B2) << 2) | \
(BIT(val, B1) << 1) | \
(BIT(val, B0) << 0))
uint16_t buffer[0x2000];
int little_endian;
int is_little_endian(void)
{
short magic, test;
char *ptr;
magic = 0xABCD;
ptr = (char *)&magic;
test = (ptr[1]<<8) + (ptr[0]&0xFF);
return (magic == test);
}
void load_table(int n)
{
static int last_loaded = -1;
if (last_loaded != n)
{
FILE *f1;
int i;
char name[250];
last_loaded = n;
sprintf(name,"%s/00%04x.tbl",srcpath,n);
f1 = fopen(name,"rb");
if (!f1)
{
printf("Can't open %s for reading.\n",name);
exit(1);
}
/* read repeatedly so we support both full dumps and reduced E000-FFFF dumps */
while (fread(buffer,1,0x4000,f1) == 0x4000) ;
fclose(f1);
if (little_endian)
{
for (i = 0;i < 0x2000;i++)
buffer[i] = (buffer[i] >> 8) | (buffer[i] << 8);
}
}
}
/*
317-0162 CPU also needs to mask:
0x107a,
0x127a,
0x147a,
0x167a,
0x187a,
0x1a7a,
0x1c7a,
0x1e7a,
this only happens with 317-0162 so far; I assume it is a fault in the CPU.
*/
int masked_opcodes[] =
{
0x013a,0x033a,0x053a,0x073a,0x083a,0x093a,0x0b3a,0x0d3a,0x0f3a,
0x103a, 0x10ba,0x10fa, 0x113a,0x117a,0x11ba,0x11fa,
0x123a, 0x12ba,0x12fa, 0x133a,0x137a,0x13ba,0x13fa,
0x143a, 0x14ba,0x14fa, 0x153a,0x157a,0x15ba,
0x163a, 0x16ba,0x16fa, 0x173a,0x177a,0x17ba,
0x183a, 0x18ba,0x18fa, 0x193a,0x197a,0x19ba,
0x1a3a, 0x1aba,0x1afa, 0x1b3a,0x1b7a,0x1bba,
0x1c3a, 0x1cba,0x1cfa, 0x1d3a,0x1d7a,0x1dba,
0x1e3a, 0x1eba,0x1efa, 0x1f3a,0x1f7a,0x1fba,
0x203a,0x207a,0x20ba,0x20fa, 0x213a,0x217a,0x21ba,0x21fa,
0x223a,0x227a,0x22ba,0x22fa, 0x233a,0x237a,0x23ba,0x23fa,
0x243a,0x247a,0x24ba,0x24fa, 0x253a,0x257a,0x25ba,
0x263a,0x267a,0x26ba,0x26fa, 0x273a,0x277a,0x27ba,
0x283a,0x287a,0x28ba,0x28fa, 0x293a,0x297a,0x29ba,
0x2a3a,0x2a7a,0x2aba,0x2afa, 0x2b3a,0x2b7a,0x2bba,
0x2c3a,0x2c7a,0x2cba,0x2cfa, 0x2d3a,0x2d7a,0x2dba,
0x2e3a,0x2e7a,0x2eba,0x2efa, 0x2f3a,0x2f7a,0x2fba,
0x303a,0x307a,0x30ba,0x30fa, 0x313a,0x317a,0x31ba,0x31fa,
0x323a,0x327a,0x32ba,0x32fa, 0x333a,0x337a,0x33ba,0x33fa,
0x343a,0x347a,0x34ba,0x34fa, 0x353a,0x357a,0x35ba,
0x363a,0x367a,0x36ba,0x36fa, 0x373a,0x377a,0x37ba,
0x383a,0x387a,0x38ba,0x38fa, 0x393a,0x397a,0x39ba,
0x3a3a,0x3a7a,0x3aba,0x3afa, 0x3b3a,0x3b7a,0x3bba,
0x3c3a,0x3c7a,0x3cba,0x3cfa, 0x3d3a,0x3d7a,0x3dba,
0x3e3a,0x3e7a,0x3eba,0x3efa, 0x3f3a,0x3f7a,0x3fba,
0x41ba,0x43ba,0x44fa,0x45ba,0x46fa,0x47ba,0x49ba,0x4bba,0x4cba,0x4cfa,0x4dba,0x4fba,
0x803a,0x807a,0x80ba,0x80fa, 0x81fa,
0x823a,0x827a,0x82ba,0x82fa, 0x83fa,
0x843a,0x847a,0x84ba,0x84fa, 0x85fa,
0x863a,0x867a,0x86ba,0x86fa, 0x87fa,
0x883a,0x887a,0x88ba,0x88fa, 0x89fa,
0x8a3a,0x8a7a,0x8aba,0x8afa, 0x8bfa,
0x8c3a,0x8c7a,0x8cba,0x8cfa, 0x8dfa,
0x8e3a,0x8e7a,0x8eba,0x8efa, 0x8ffa,
0x903a,0x907a,0x90ba,0x90fa, 0x91fa,
0x923a,0x927a,0x92ba,0x92fa, 0x93fa,
0x943a,0x947a,0x94ba,0x94fa, 0x95fa,
0x963a,0x967a,0x96ba,0x96fa, 0x97fa,
0x983a,0x987a,0x98ba,0x98fa, 0x99fa,
0x9a3a,0x9a7a,0x9aba,0x9afa, 0x9bfa,
0x9c3a,0x9c7a,0x9cba,0x9cfa, 0x9dfa,
0x9e3a,0x9e7a,0x9eba,0x9efa, 0x9ffa,
0xb03a,0xb07a,0xb0ba,0xb0fa, 0xb1fa,
0xb23a,0xb27a,0xb2ba,0xb2fa, 0xb3fa,
0xb43a,0xb47a,0xb4ba,0xb4fa, 0xb5fa,
0xb63a,0xb67a,0xb6ba,0xb6fa, 0xb7fa,
0xb83a,0xb87a,0xb8ba,0xb8fa, 0xb9fa,
0xba3a,0xba7a,0xbaba,0xbafa, 0xbbfa,
0xbc3a,0xbc7a,0xbcba,0xbcfa, 0xbdfa,
0xbe3a,0xbe7a,0xbeba,0xbefa, 0xbffa,
0xc03a,0xc07a,0xc0ba,0xc0fa, 0xc1fa,
0xc23a,0xc27a,0xc2ba,0xc2fa, 0xc3fa,
0xc43a,0xc47a,0xc4ba,0xc4fa, 0xc5fa,
0xc63a,0xc67a,0xc6ba,0xc6fa, 0xc7fa,
0xc83a,0xc87a,0xc8ba,0xc8fa, 0xc9fa,
0xca3a,0xca7a,0xcaba,0xcafa, 0xcbfa,
0xcc3a,0xcc7a,0xccba,0xccfa, 0xcdfa,
0xce3a,0xce7a,0xceba,0xcefa, 0xcffa,
0xd03a,0xd07a,0xd0ba,0xd0fa, 0xd1fa,
0xd23a,0xd27a,0xd2ba,0xd2fa, 0xd3fa,
0xd43a,0xd47a,0xd4ba,0xd4fa, 0xd5fa,
0xd63a,0xd67a,0xd6ba,0xd6fa, 0xd7fa,
0xd83a,0xd87a,0xd8ba,0xd8fa, 0xd9fa,
0xda3a,0xda7a,0xdaba,0xdafa, 0xdbfa,
0xdc3a,0xdc7a,0xdcba,0xdcfa, 0xddfa,
0xde3a,0xde7a,0xdeba,0xdefa, 0xdffa
};
int final_decrypt(int i,int moreffff)
{
int j;
/* final "obfuscation": invert bits 7 and 14 following a fixed pattern */
int dec = i;
if ((i & 0xf080) == 0x8000) dec ^= 0x0080;
if ((i & 0xf080) == 0xc080) dec ^= 0x0080;
if ((i & 0xb080) == 0x8000) dec ^= 0x4000;
if ((i & 0xb100) == 0x0000) dec ^= 0x4000;
/* mask out opcodes doing PC-relative addressing, replace them with FFFF */
for (j = 0;j < sizeof(masked_opcodes)/sizeof(masked_opcodes[0]);j++)
{
if ((dec & 0xfffe) == masked_opcodes[j])
{
dec = 0xffff;
break;
}
}
/* optionally, even more values can be replaced with FFFF */
if (moreffff)
{
if ((dec & 0xff80) == 0x4e80)
dec = 0xffff;
if ((dec & 0xf0f8) == 0x50c8)
dec = 0xffff;
if ((dec & 0xf000) == 0x6000)
dec = 0xffff;
}
return dec;
}
static int parametric_decode(int val,int mainkey,int key_F,int gkey1,int gkey2,int gkey3)
{
int key_6a,key_7a,key_6b;
int key_0a,key_0b,key_0c;
int key_1a,key_1b,key_2a,key_2b,key_3a,key_3b,key_4a,key_4b,key_5a,key_5b;
int global_xor0,global_xor1;
int global_swap0a,global_swap1,global_swap2,global_swap3,global_swap4;
int global_swap0b;
global_xor0 = 1^BIT(gkey1,5); // could be bit 7
global_xor1 = 1^BIT(gkey1,2);
global_swap2 = 1^BIT(gkey1,0);
global_swap0a = 1^BIT(gkey2,5);
global_swap0b = 1^BIT(gkey2,2);
global_swap3 = 1^BIT(gkey3,6);
global_swap1 = 1^BIT(gkey3,4);
global_swap4 = 1^BIT(gkey3,2);
key_0a = BIT(mainkey,0) ^ BIT(gkey3,1);
key_0b = BIT(mainkey,0) ^ BIT(gkey1,7); // could be bit 5
key_0c = BIT(mainkey,0) ^ BIT(gkey1,1);
key_1a = BIT(mainkey,1) ^ BIT(gkey2,7);
key_1b = BIT(mainkey,1) ^ BIT(gkey1,3);
key_2a = BIT(mainkey,2) ^ BIT(gkey3,7); // could be bit 5
key_2b = BIT(mainkey,2) ^ BIT(gkey1,4);
key_3a = BIT(mainkey,3) ^ BIT(gkey2,0);
key_3b = BIT(mainkey,3) ^ BIT(gkey3,3);
key_4a = BIT(mainkey,4) ^ BIT(gkey2,3);
key_4b = BIT(mainkey,4) ^ BIT(gkey3,0);
key_5a = BIT(mainkey,5) ^ BIT(gkey3,5); // could be bit 7
key_5b = BIT(mainkey,5) ^ BIT(gkey1,6);
key_6a = BIT(mainkey,6) ^ BIT(gkey2,1);
key_6b = BIT(mainkey,6) ^ BIT(gkey2,6);
key_7a = BIT(mainkey,7) ^ BIT(gkey2,4);
if ((val & 0xe000) == 0x0000)
val = bitswap<16>(val, 12,15,14,13,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0);
else
{
if (val & 0x8000)
{
if (!global_xor1) if (~val & 0x0008) val ^= 0x2410; // 13,10,4
if (~val & 0x0004) val ^= 0x0022; // 5,1
if (!key_1b) if (~val & 0x1000) val ^= 0x0848; // 11,6,3
if (!global_swap2) if (!key_0c) val ^= 0x4101; // 14,8,0
if (!key_2b) val = bitswap<16>(val, 15,14,13, 9,11,10,12, 8, 2, 6, 5, 4, 3, 7, 1, 0); // 12,9,7,2
val = 0x6561 ^ bitswap<16>(val, 15, 9,10,13, 3,12, 0,14, 6, 5, 2,11, 8, 1, 4, 7);
}
if (val & 0x4000)
{
if (!global_xor0) if (val & 0x0800) val ^= 0x9048; // 15,12,6,3
if (!key_3a) if (val & 0x0004) val ^= 0x0202; // 9,1
if (!key_6a) if (val & 0x0400) val ^= 0x0004; // 2
if (!key_5b) if (!key_0b) val ^= 0x08a1; // 11,7,5,0
if (!global_swap0b) val = bitswap<16>(val, 15,14,10,12,11,13, 9, 4, 7, 6, 5, 8, 3, 2, 1, 0); // 13,10,8,4
val = 0x3523 ^ bitswap<16>(val, 13,14, 7, 0, 8, 6, 4, 2, 1,15, 3,11,12,10, 5, 9);
}
if (val & 0x2000)
{
if (!key_4a) if (val & 0x0100) val ^= 0x4210; // 14,9,4
if (!key_1a) if (val & 0x0040) val ^= 0x0080; // 7
if (!key_7a) if (val & 0x0001) val ^= 0x110a; // 12,8,3,1
if (!key_4b) if (!key_0a) val ^= 0x0040; // 6
if (!global_swap0a) if (!key_6b) val ^= 0x0404; // 10,2
if (!key_5b) val = bitswap<16>(val, 0,14,13,12,15,10, 9, 8, 7, 6,11, 4, 3, 2, 1, 5); // 15,11,5,0
val = 0x99a5 ^ bitswap<16>(val, 10, 2,13, 7, 8, 0, 3,14, 6,15, 1,11, 9, 4, 5,12);
}
val = 0x87ff ^ bitswap<16>(val, 5,15,13,14, 6, 0, 9,10, 4,11, 1, 2,12, 3, 7, 8);
if (!global_swap4) val = bitswap<16>(val, 6,14,13,12,11,10, 9, 5, 7,15, 8, 4, 3, 2, 1, 0); // 15-6, 8-5
if (!global_swap3) val = bitswap<16>(val, 15,12,14,13,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0); // 12-13-14
if (!global_swap2) val = bitswap<16>(val, 15,14,13,12,11, 2, 9, 8,10, 6, 5, 4, 3, 0, 1, 7); // 10-2-0-7
if (!key_3b) val = bitswap<16>(val, 15,14,13,12,11,10, 4, 8, 7, 6, 5, 9, 1, 2, 3, 0); // 9-4, 3-1
if (!key_2a) val = bitswap<16>(val, 15,12,13,14,11,10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0); // 14-12
if (!global_swap1) val = bitswap<16>(val, 15,14,13,12, 9, 8,11,10, 7, 6, 5, 4, 3, 2, 1, 0); // 11...8
if (!key_5a) val = bitswap<16>(val, 15,14,13,12,11,10, 9, 8, 4, 5, 7, 6, 3, 2, 1, 0); // 7...4
if (!global_swap0a) val = bitswap<16>(val, 15,14,13,12,11,10, 9, 8, 7, 6, 5, 4, 0, 3, 2, 1); // 3...0
}
return final_decrypt(val,key_F);
}
int check_key(int key,int key_F,int gkey1,int gkey2,int gkey3)
{
int i;
int err_ffff = 0;
if (state2)
{
gkey1 ^= 0x01;
gkey2 ^= 0x10;
gkey3 ^= 0x01;
}
for (i = 0xffff;i >= 0xe000;i--)
{
if (parametric_decode(i,key,key_F,gkey1,gkey2,gkey3) != buffer[i - 0xe000])
{
if (buffer[i - 0xe000] == 0xffff)
{
err_ffff++;
if (err_ffff > 8) break;
}
else
break;
}
}
if (i < 0xe000)
{
/* special handling for CPU 317-0162 */
if (err_ffff)
{
printf("warning: %d FFFF errors: ",err_ffff);
for (i = 0xe000;i < 0x10000;i++)
{
if (parametric_decode(i,key,key_F,gkey1,gkey2,gkey3) != buffer[i - 0xe000])
printf("%04x ",parametric_decode(i,key,key_F,gkey1,gkey2,gkey3));
}
printf("\n");
}
return 1;
}
else
return 0;
}
static void print_binary(int num)
{
int i;
for (i = 7;i >= 0;i--)
printf("%d",BIT(num,i));
}
static int global_key1,global_key2,global_key3;
void find_global_key(void)
{
int gkey1,gkey2,gkey3;
int found = 0;
printf("Searching for global key...\n");
for (gkey1 = 0;gkey1 < 0x100;gkey1++)
{
fprintf(stderr,"%02x/ff\r",gkey1);
for (gkey2 = 0;gkey2 < 0x100;gkey2++)
{
for (gkey3 = 0;gkey3 < 0x100;gkey3++)
{
load_table(2);
if (check_key(gkey1,BIT(gkey1,6),gkey1,gkey2,gkey3))
{
load_table(4);
if (check_key(gkey2,BIT(gkey2,6),gkey1,gkey2,gkey3))
{
load_table(6);
if (check_key(gkey3,BIT(gkey3,6),gkey1,gkey2,gkey3))
{
global_key1 = gkey1;
global_key2 = gkey2;
global_key3 = gkey3;
printf("global key: ");
print_binary(gkey1);
printf(" ");
print_binary(gkey2);
printf(" ");
print_binary(gkey3);
printf("\n");
found++;
}
}
}
}
}
}
if (found > 1)
{
printf("The tables from state %02x don't allow to uniquely determine the global key.\n",state2*2);
printf("You should dump tables from state %02x and run the program again.\n",(state2^1)*2);
exit(0);
}
if (found == 0)
{
int key1,key2,key3;
printf("Couldn't find the global key. This might be caused by:\n");
printf("1) Incorrectly dumped data\n");
printf("2) Wrong <state> parameter. 00 instead of 02, or 02 instead of 00.\n");
printf("3) An error in the current FD1094 emulation.\n\n");
printf("I will now execute a broader key search, which will take a longer time.\n");
printf("If 1) and 2) are correct, and this search succeeds, contact MAMEDEV.\n");
for (gkey1 = 0;gkey1 < 0x100;gkey1++)
{
fprintf(stderr,"%02x/ff\r",gkey1);
for (gkey2 = 0;gkey2 < 0x100;gkey2++)
{
for (gkey3 = 0;gkey3 < 0x100;gkey3++)
{
load_table(2);
for (key1 = gkey1 & 0x5f;key1 < 0x100;key1 += 0x20)
{
if (check_key(key1,BIT(key1,6),gkey1,gkey2,gkey3) || check_key(key1,BIT(key1,6)^1,gkey1,gkey2,gkey3))
{
load_table(4);
key2 = gkey2;
{
if (check_key(key2,BIT(key2,6),gkey1,gkey2,gkey3) || check_key(key2,BIT(key2,6)^1,gkey1,gkey2,gkey3))
{
load_table(6);
for (key3 = gkey3 & 0x5f;key3 < 0x100;key3 += 0x20)
{
if (check_key(key3,BIT(key3,6),gkey1,gkey2,gkey3) || check_key(key3,BIT(key3,6)^1,gkey1,gkey2,gkey3))
{
printf("key: ");
print_binary(key1);
printf(" ");
print_binary(key2);
printf(" ");
print_binary(key3);
printf(" ");
printf("global key: ");
print_binary(gkey1);
printf(" ");
print_binary(gkey2);
printf(" ");
print_binary(gkey3);
printf("\n");
}
}
}
}
}
}
}
}
}
exit(0);
}
}
uint8_t mainkey[0x2000];
void find_main_key(void)
{
int n,key,keyF,allfound = 0,found;
printf("Searching for main key...\n");
for (n = 0;n < 0x2000;n++)
{
if (n % 16 == 0) fprintf(stderr,"%03x/1ff\r",n/16);
load_table(n*2);
found = 0;
for (key = 0;key < 0x100;key++)
{
if (n & 0x1000) keyF = BIT(key,7);
else keyF = BIT(key,6);
if (check_key(key,keyF,global_key1,global_key2,global_key3))
{
mainkey[n] = key;
found++;
}
}
if (found == 0)
printf("00%04x.tbl: can't decrypt\n",n*2);
else if (found == 1)
allfound++;
else if (found > 1)
{
printf("00%04x.tbl: ambiguous key\n",n*2);
printf("The tables from state %02x don't allow to uniquely determine the main key.\n",state2*2);
printf("You should dump tables from state %02x and run the program again.\n",(state2^1)*2);
exit(0);
}
}
if (allfound != 0x2000)
{
printf("The tables listed above are probably bad dumps.\n");
printf("You should try redumping them and run the program again.\n");
exit(0);
}
printf("Key generation succeeded!\n");
}
void save_main_key()
{
FILE *f1;
f1 = fopen(dstfilename,"wb");
if (!f1)
{
printf("Can't open %s for writing.\n",dstfilename);
exit(1);
}
if (fwrite(mainkey,1,0x2000,f1) == 0x2000)
printf("Key saved in current directory as %s.\n",dstfilename);
else
printf("Error saving key.\n");
fclose(f1);
}
int main(int argc,char **argv)
{
if (argc != 4 || (strcmp(argv[2],"00") && strcmp(argv[2],"02")))
{
printf("Usage: %s <path> <state> <CPU name>\n\n",argv[0]);
printf("<path>: path to the directory holding the tables\n");
printf(" files must be called 000000.tbl, 000002.tbl ... 003FFE.tbl\n");
printf("<state>: must be 00 or 02 - CPU state in which the tables were extracted\n");
printf("<CPU name>: part name of the CPU\n");
printf("\nExample: %s c:/dumps/0053-0000 00 317-0053\n",argv[0]);
return 0;
}
sprintf(srcpath,argv[1]);
if (strcmp(argv[2],"02") == 0)
state2 = 1;
else
state2 = 0;
sprintf(dstfilename,"%s.key",argv[3]);
printf("reading tables from %s\n",srcpath);
printf("tables were read from the CPU in state %s\n",state2 ? "02" : "00");
printf("output file will be %s\n\n",dstfilename);
little_endian = is_little_endian();
find_global_key();
find_main_key();
save_main_key();
return 0;
}
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