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improve amazonia decryption [iq_132]

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This commit is contained in:
David Haywood 2015-09-12 02:03:36 +01:00
parent 45589ff3e6
commit 9b5c3ab3e0
1 changed files with 35 additions and 33 deletions
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68
src/mame/machine/pgmcrypt.c
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@ -1572,46 +1572,48 @@ void fruitpar_decrypt(running_machine &machine)
}
}
static UINT8 amazonia_tab[0x100] = { // seems to be correct
0x87, 0x01, 0xd3, 0x6b, 0x79, 0x00, 0xbd, 0x81, 0xc7, 0x8f, 0x9b, 0xd9, 0x3b, 0x53, 0x09, 0x15,
0x05, 0x57, 0x7b, 0x1f, 0x2f, 0x09, 0x47, 0xa1, 0x45, 0x00, 0xf7, 0xbf, 0x3d, 0x59, 0xd1, 0x19,
0xad, 0xd5, 0xa1, 0x03, 0x2d, 0x35, 0xc7, 0x07, 0x09, 0x4f, 0x85, 0x95, 0x2b, 0x3f, 0x89, 0x09,
0x49, 0x85, 0xb9, 0xe7, 0x4b, 0x53, 0x3f, 0x51, 0xff, 0x3b, 0xd5, 0xc9, 0xff, 0xfd, 0x53, 0x25,
0xe3, 0xa9, 0x75, 0xd7, 0xa3, 0xfd, 0xf1, 0x5f, 0x51, 0xfb, 0xbb, 0x09, 0xf5, 0xc9, 0x91, 0xed,
0xc7, 0xcd, 0xc9, 0x25, 0x93, 0x07, 0x63, 0x51, 0x69, 0xb3, 0x4b, 0x47, 0x85, 0x19, 0xe7, 0x1f,
0x7f, 0xb3, 0xe9, 0x5f, 0xb5, 0x8b, 0x57, 0x83, 0xf5, 0xcb, 0xd5, 0xb1, 0x6d, 0xa3, 0x37, 0xbb,
0xd7, 0x67, 0x45, 0x55, 0xe3, 0xdd, 0xcf, 0x97, 0xdd, 0xe9, 0xf1, 0xb5, 0xa7, 0x63, 0xa5, 0xfd,
0xdb, 0x2b, 0x93, 0x13, 0x37, 0x95, 0x0d, 0x69, 0x4d, 0xf7, 0x6d, 0x03, 0x6f, 0x8b, 0x95, 0x69,
0xd5, 0x8b, 0xc3, 0xeb, 0x0f, 0x8b, 0x97, 0x1b, 0xb1, 0x19, 0x5f, 0x89, 0x3d, 0x95, 0xa9, 0xb9,
0x4f, 0x4b, 0x0b, 0x6b, 0x05, 0xd5, 0x2d, 0x0b, 0xb5, 0xb7, 0x19, 0x75, 0xcf, 0x35, 0xc3, 0xef,
0x13, 0x71, 0xdb, 0x61, 0xf3, 0xcb, 0xd3, 0xd7, 0x3f, 0x79, 0x2d, 0x39, 0x21, 0x65, 0x07, 0x49,
0x31, 0x47, 0xe9, 0xdd, 0xf3, 0x03, 0xcf, 0x5f, 0x7f, 0x45, 0x71, 0x83, 0x69, 0x5b, 0xd9, 0x47,
0xef, 0x53, 0x27, 0x2f, 0x63, 0x55, 0x9f, 0xc1, 0xdf, 0x41, 0xf5, 0x41, 0x27, 0x8d, 0xdb, 0xa7,
0xd9, 0x5b, 0xc7, 0xe5, 0xdd, 0xd7, 0x09, 0x5f, 0x09, 0xd7, 0x0d, 0xa1, 0x13, 0xb3, 0xef, 0x67,
0xbb, 0x65, 0x3d, 0xcd, 0x3b, 0xdf, 0x0f, 0xd3, 0xe7, 0xab, 0x4d, 0x15, 0x29, 0xc5, 0x39, 0xc9
static UINT8 amazonia_tab[0x100] = {
0x86, 0x00, 0xd2, 0x6b, 0x78, 0x79, 0xbc, 0x80, 0xc6, 0x8e, 0x9b, 0xd8, 0x3a, 0x52, 0x09, 0x15,
0x05, 0x57, 0x7a, 0x1f, 0x2f, 0x08, 0x47, 0xa0, 0x44, 0x4c, 0xf7, 0xbe, 0x3d, 0x59, 0xd1, 0x18,
0xac, 0xd5, 0xa0, 0x03, 0x2c, 0x34, 0xc6, 0x06, 0x08, 0x4e, 0x84, 0x94, 0x2b, 0x3f, 0x88, 0x08,
0x48, 0x84, 0xb8, 0xe6, 0x4a, 0x53, 0x3e, 0x51, 0xfe, 0x3b, 0xd4, 0xc8, 0xff, 0xfd, 0x52, 0x25,
0xe2, 0xa9, 0x75, 0xd7, 0xa3, 0xfc, 0xf1, 0x5f, 0x50, 0xfa, 0xba, 0x09, 0xf4, 0xc8, 0x90, 0xed,
0xc6, 0xcc, 0xc9, 0x25, 0x93, 0x07, 0x63, 0x50, 0x69, 0xb2, 0x4a, 0x47, 0x85, 0x18, 0xe6, 0x1f,
0x7f, 0xb3, 0xe8, 0x5f, 0xb4, 0x8a, 0x56, 0x83, 0xf4, 0xca, 0xd5, 0xb1, 0x6d, 0xa3, 0x37, 0xba,
0xd7, 0x66, 0x45, 0x54, 0xe2, 0xdc, 0xce, 0x96, 0xdc, 0xe9, 0xf0, 0xb5, 0xa7, 0x62, 0xa5, 0xfd,
0xdb, 0x2b, 0x92, 0x13, 0x37, 0x95, 0x0c, 0x69, 0x4d, 0xf7, 0x6c, 0x02, 0x6e, 0x8a, 0x95, 0x68,
0xd4, 0x8a, 0xc3, 0xea, 0x0f, 0x8b, 0x96, 0x1b, 0xb1, 0x19, 0x5e, 0x88, 0x3d, 0x94, 0xa9, 0xb9,
0x4e, 0x4a, 0x0a, 0x6a, 0x04, 0xd5, 0x2c, 0x0b, 0xb4, 0xb7, 0x18, 0x75, 0xcf, 0x35, 0xc3, 0xef,
0x13, 0x71, 0xdb, 0x61, 0xf2, 0xcb, 0xd3, 0xd7, 0x3f, 0x79, 0x2d, 0x39, 0x20, 0x65, 0x07, 0x49,
0x30, 0x47, 0xe9, 0xdd, 0xf3, 0x03, 0xce, 0x5f, 0x7f, 0x45, 0x70, 0x82, 0x69, 0x5a, 0xd9, 0x46,
0xee, 0x52, 0x27, 0x2f, 0x63, 0x54, 0x9f, 0xc1, 0xde, 0x41, 0xf5, 0x40, 0x26, 0x8d, 0xda, 0xa6,
0xd9, 0x5a, 0xc7, 0xe4, 0xdc, 0xd6, 0x09, 0x5e, 0x08, 0xd6, 0x0d, 0xa1, 0x12, 0xb3, 0xee, 0x67,
0xbb, 0x65, 0x3c, 0xcd, 0x3a, 0xdf, 0x0f, 0xd3, 0xe6, 0xaa, 0x4d, 0x14, 0x28, 0xc5, 0x38, 0xc8
};
void amazonia_decrypt(running_machine &machine)
{
int i;
UINT16 *src = (UINT16 *)machine.root_device().memregion("user1")->base();
int i;
UINT16 *src = (UINT16 *) machine.root_device().memregion("user1")->base();
int rom_size = 0x80000;
for (i = 0; i < rom_size / 2; i++) {
int x = amazonia_tab[(i / 2) & 0xff] << 8;
int rom_size = 0x80000;
if ((i & 0x040480) != 0x000080) x ^= 0x0001;
if ((i & 0x004008) == 0x004008) x ^= 0x0002;
if ((i & 0x080030) == 0x080010) x ^= 0x0004; // pin high??
if ((i & 0x000242) != 0x000042) x ^= 0x0008;
if ((i & 0x008100) == 0x008000) x ^= 0x0010;
if ((i & 0x022004) != 0x000004) x ^= 0x0020; // verified
if ((i & 0x011800) != 0x010000) x ^= 0x0040;
if ((i & 0x004820) == 0x004820) x ^= 0x0080; // verified
for(i=0; i<rom_size/2; i++) {
UINT16 x = src[i];
src[i] ^= x;
}
IGS27_CRYPT1
IGS27_CRYPT2_ALT
IGS27_CRYPT3
IGS27_CRYPT4
IGS27_CRYPT5
IGS27_CRYPT6_ALT
IGS27_CRYPT7
IGS27_CRYPT8
x ^= amazonia_tab[(i >> 1) & 0xff] << 8;
src[i] = x;
}
}
// not 100% verified