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igs/pgmcrypt.cpp: Removed obsolete lhzb3_decrypt and lhdmgp_decrypt.

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* Changed some functions to make it clearer that keystream is generated from address.
* Got rid of literal ROM lengths from decryption functions for igs/igs_fear.cpp games.
This commit is contained in:
Vas Crabb 2024-09-04 21:53:01 +10:00
parent be672ec12a
commit 83a96c94ed
3 changed files with 46 additions and 119 deletions
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13
src/mame/igs/igs_m027.cpp
View File

@ -77,7 +77,6 @@ public:
void init_mgcs3() ATTR_COLD; void init_mgcs3() ATTR_COLD;
void init_jking02() ATTR_COLD; void init_jking02() ATTR_COLD;
void init_lhdmg() ATTR_COLD; void init_lhdmg() ATTR_COLD;
void init_lhdmgp() ATTR_COLD;
void init_lthy() ATTR_COLD; void init_lthy() ATTR_COLD;
void init_luckycrs() ATTR_COLD; void init_luckycrs() ATTR_COLD;
void init_olympic5() ATTR_COLD; void init_olympic5() ATTR_COLD;
@ -163,6 +162,7 @@ void igs_m027_state::igs_mahjong_map(address_map &map)
map(0x4000000c, 0x4000000f).r(FUNC(igs_m027_state::unk2_r)); map(0x4000000c, 0x4000000f).r(FUNC(igs_m027_state::unk2_r));
map(0x40000018, 0x4000001b).w(FUNC(igs_m027_state::dsw_io_select_w)); map(0x40000018, 0x4000001b).w(FUNC(igs_m027_state::dsw_io_select_w));
map(0x50000000, 0x500003ff).umask32(0x000000ff).w(FUNC(igs_m027_state::xor_table_w)); // uploads XOR table to external ROM here
map(0x70000200, 0x70000203).ram(); // ?????????????? map(0x70000200, 0x70000203).ram(); // ??????????????
map(0xf0000000, 0xf000000f).nopw(); // magic registers map(0xf0000000, 0xf000000f).nopw(); // magic registers
} }
@ -173,7 +173,6 @@ void igs_m027_state::igs_mahjong_xor_map(address_map &map)
map(0x08000000, 0x0807ffff).r(FUNC(igs_m027_state::external_rom_r)); // Game ROM map(0x08000000, 0x0807ffff).r(FUNC(igs_m027_state::external_rom_r)); // Game ROM
map(0x50000000, 0x500003ff).umask32(0x000000ff).w(FUNC(igs_m027_state::xor_table_w)); // uploads XOR table to external ROM here
} }
void igs_m027_state::extradraw_map(address_map &map) void igs_m027_state::extradraw_map(address_map &map)
@ -1573,14 +1572,6 @@ void igs_m027_state::init_lhdmg()
m_maincpu->space(AS_PROGRAM).install_read_handler(0x4000000c, 0x4000000f, read32smo_delegate(*this, FUNC(igs_m027_state::lhdmg_unk2_r))); m_maincpu->space(AS_PROGRAM).install_read_handler(0x4000000c, 0x4000000f, read32smo_delegate(*this, FUNC(igs_m027_state::lhdmg_unk2_r)));
} }
void igs_m027_state::init_lhdmgp()
{
lhdmgp_decrypt(machine());
m_igs017_igs031->set_text_reverse_bits(false);
m_maincpu->space(AS_PROGRAM).install_read_handler(0x4000000c, 0x4000000f, read32smo_delegate(*this, FUNC(igs_m027_state::lhdmg_unk2_r)));
}
} // anonymous namespace } // anonymous namespace
@ -1596,7 +1587,7 @@ GAME( 1999, qlgs, 0, igs_mahjong_xor, qlgs, igs_m027_state, init
GAME( 1999, fruitpar, 0, igs_mahjong_xor, base, igs_m027_state, init_fruitpar, ROT0, "IGS", "Fruit Paradise (V214)", MACHINE_NOT_WORKING ) GAME( 1999, fruitpar, 0, igs_mahjong_xor, base, igs_m027_state, init_fruitpar, ROT0, "IGS", "Fruit Paradise (V214)", MACHINE_NOT_WORKING )
GAME( 1999, fruitpara, fruitpar, igs_mahjong_xor, base, igs_m027_state, init_fruitpar, ROT0, "IGS", "Fruit Paradise (V206US)", MACHINE_NOT_WORKING ) GAME( 1999, fruitpara, fruitpar, igs_mahjong_xor, base, igs_m027_state, init_fruitpar, ROT0, "IGS", "Fruit Paradise (V206US)", MACHINE_NOT_WORKING )
GAME( 1999, lhdmg, 0, igs_mahjong_xor, base, igs_m027_state, init_lhdmg, ROT0, "IGS", "Long Hu Da Man Guan", MACHINE_NOT_WORKING ) GAME( 1999, lhdmg, 0, igs_mahjong_xor, base, igs_m027_state, init_lhdmg, ROT0, "IGS", "Long Hu Da Man Guan", MACHINE_NOT_WORKING )
GAME( 1999, lhdmgp, lhdmg, igs_mahjong_xor, base, igs_m027_state, init_lhdmgp, ROT0, "IGS", "Long Hu Da Man Guan Plus", MACHINE_NOT_WORKING ) GAME( 1999, lhdmgp, lhdmg, igs_mahjong_xor, base, igs_m027_state, init_lhdmg, ROT0, "IGS", "Long Hu Da Man Guan Plus", MACHINE_NOT_WORKING )
GAME( 1999, lhzb3, 0, igs_mahjong_xor, base, igs_m027_state, init_lhdmg, ROT0, "IGS", "Long Hu Zhengba III", MACHINE_NOT_WORKING ) // 龙虎争霸Ⅲ GAME( 1999, lhzb3, 0, igs_mahjong_xor, base, igs_m027_state, init_lhdmg, ROT0, "IGS", "Long Hu Zhengba III", MACHINE_NOT_WORKING ) // 龙虎争霸Ⅲ
GAME( 2004, lhzb4, 0, igs_mahjong_xor, base, igs_m027_state, init_lhzb4, ROT0, "IGS", "Long Hu Zhengba 4", MACHINE_NOT_WORKING ) // 龙虎争霸4 GAME( 2004, lhzb4, 0, igs_mahjong_xor, base, igs_m027_state, init_lhzb4, ROT0, "IGS", "Long Hu Zhengba 4", MACHINE_NOT_WORKING ) // 龙虎争霸4
GAME( 1999, lthy, 0, igs_mahjong_xor, base, igs_m027_state, init_lthy, ROT0, "IGS", "Long Teng Hu Yue", MACHINE_NOT_WORKING ) GAME( 1999, lthy, 0, igs_mahjong_xor, base, igs_m027_state, init_lthy, ROT0, "IGS", "Long Teng Hu Yue", MACHINE_NOT_WORKING )

143
src/mame/igs/pgmcrypt.cpp
View File

@ -1042,7 +1042,7 @@ void chessc2_decrypt(running_machine &machine)
for (int i = 0; i < rom_size / 2; i++) for (int i = 0; i < rom_size / 2; i++)
{ {
uint16_t x = src[i]; uint16_t x = 0;
IGS27_CRYPT1 IGS27_CRYPT1
IGS27_CRYPT2_ALT IGS27_CRYPT2_ALT
@ -1053,7 +1053,7 @@ void chessc2_decrypt(running_machine &machine)
IGS27_CRYPT7 IGS27_CRYPT7
IGS27_CRYPT8 IGS27_CRYPT8
src[i] = x; src[i] ^= x;
} }
} }
@ -1112,7 +1112,7 @@ void zhongguo_decrypt(running_machine &machine)
for (int i = 0; i < rom_size / 2; i++) for (int i = 0; i < rom_size / 2; i++)
{ {
uint16_t x = src[i]; uint16_t x = 0;
IGS27_CRYPT1 IGS27_CRYPT1
IGS27_CRYPT2_ALT IGS27_CRYPT2_ALT
@ -1123,7 +1123,7 @@ void zhongguo_decrypt(running_machine &machine)
IGS27_CRYPT7 IGS27_CRYPT7
IGS27_CRYPT8 IGS27_CRYPT8
src[i] = x; src[i] ^= x;
} }
} }
@ -1219,50 +1219,6 @@ void sddz_decrypt(running_machine &machine)
} }
} }
static const uint8_t lhzb3_tab[0x100] = {
0x13, 0x45, 0x21, 0xa1, 0x69, 0x9a, 0x05, 0xda, 0x7d, 0x10, 0xda, 0x7f, 0x34, 0x9f, 0xf3, 0x64,
0x35, 0xf9, 0x16, 0x1c, 0xd4, 0x60, 0x02, 0xf3, 0x42, 0xc7, 0x42, 0x29, 0xf3, 0x2c, 0x31, 0x71,
0x50, 0x35, 0x4e, 0xaa, 0x9f, 0x09, 0xc3, 0xdd, 0x2f, 0x72, 0x30, 0x77, 0xc7, 0x30, 0xbc, 0xc8,
0x51, 0xa0, 0x5e, 0xbb, 0xc3, 0x8e, 0x69, 0xd7, 0x4f, 0x57, 0x56, 0x77, 0xcb, 0x43, 0xd6, 0x46,
0x62, 0x21, 0x18, 0xfd, 0x7d, 0x24, 0x58, 0x61, 0xec, 0xfe, 0xa9, 0x77, 0x59, 0x3b, 0x03, 0x0a,
0xef, 0xdf, 0x90, 0x60, 0x46, 0x43, 0x33, 0x38, 0x92, 0x2d, 0x5a, 0x08, 0x0d, 0x2f, 0x05, 0x75,
0x3e, 0x60, 0x87, 0x22, 0xb7, 0xbf, 0xd6, 0xf9, 0x17, 0x86, 0xea, 0x02, 0xbe, 0x23, 0xba, 0xd3,
0xdd, 0x0d, 0x3e, 0x8c, 0x65, 0xa0, 0xf8, 0xd8, 0x2f, 0x35, 0xc6, 0x26, 0x6c, 0x81, 0xe6, 0x29,
0x50, 0x30, 0x4a, 0x8e, 0xfa, 0xc2, 0x1e, 0xfd, 0xa7, 0xa5, 0x98, 0x53, 0x18, 0x94, 0xff, 0x1d,
0x41, 0x2f, 0xff, 0x58, 0x33, 0xdc, 0x2b, 0x67, 0x4b, 0xdd, 0xd3, 0x56, 0x9c, 0xb2, 0x09, 0x4e,
0x9b, 0xb1, 0xee, 0x58, 0x0a, 0xe4, 0x42, 0x56, 0x26, 0x23, 0x2c, 0x3f, 0x14, 0x73, 0x46, 0x9a,
0xa1, 0x42, 0x17, 0x12, 0xdb, 0xa2, 0xdd, 0x5d, 0x0c, 0xec, 0xdc, 0xf7, 0xc1, 0x76, 0xe0, 0x24,
0x65, 0xef, 0x41, 0x83, 0x35, 0x38, 0x78, 0x0e, 0x65, 0x82, 0xe3, 0x55, 0x90, 0xa8, 0xd5, 0xf7,
0x66, 0xcf, 0xe2, 0x61, 0x91, 0x3c, 0x69, 0xcb, 0xe7, 0x75, 0x62, 0x6f, 0xd7, 0x9b, 0x69, 0x0c,
0x0d, 0x07, 0x0c, 0x9c, 0x68, 0x24, 0x51, 0x51, 0x1f, 0x8d, 0x8b, 0xd6, 0x2e, 0x67, 0x5f, 0xc3,
0x07, 0x00, 0x12, 0x61, 0x77, 0xa8, 0x15, 0xa1, 0xd6, 0xd0, 0xd3, 0x57, 0x73, 0x62, 0xb9, 0xbb
};
void lhzb3_decrypt(running_machine &machine)
{
auto const src = reinterpret_cast<u16 *>(machine.root_device().memregion("user1")->base());
int const rom_size = 0x80000;
for (int i = 0; i < rom_size / 2; i++)
{
uint16_t x = src[i];
IGS27_CRYPT1
IGS27_CRYPT2_ALT
// IGS27_CRYPT3
IGS27_CRYPT4
IGS27_CRYPT5
IGS27_CRYPT6_ALT
IGS27_CRYPT7
IGS27_CRYPT8
x ^= lhzb3_tab[(i>> 1) & 0xff] << 8;
src[i] = x;
}
}
// IGS FOR V000CN 2004 12 01 // IGS FOR V000CN 2004 12 01
void lhzb4_decrypt(running_machine &machine) void lhzb4_decrypt(running_machine &machine)
@ -1273,7 +1229,7 @@ void lhzb4_decrypt(running_machine &machine)
for (int i = 0; i < rom_size / 2; i++) for (int i = 0; i < rom_size / 2; i++)
{ {
uint16_t x = src[i]; uint16_t x = 0;
IGS27_CRYPT1 IGS27_CRYPT1
// IGS27_CRYPT2 // IGS27_CRYPT2
@ -1284,7 +1240,7 @@ void lhzb4_decrypt(running_machine &machine)
IGS27_CRYPT7 IGS27_CRYPT7
IGS27_CRYPT8_ALT IGS27_CRYPT8_ALT
src[i] = x; src[i] ^= x;
} }
} }
@ -1313,13 +1269,13 @@ static const uint8_t superkds_tab[256] = {
void superkds_decrypt(running_machine &machine) void superkds_decrypt(running_machine &machine)
{ {
auto const src = util::little_endian_cast<u16>(reinterpret_cast<u32 *>(machine.root_device().memregion("user1")->base())); memory_region *const region = machine.root_device().memregion("user1");
auto const src = util::little_endian_cast<u16>(reinterpret_cast<u32 *>(region->base()));
int const rom_size = 0x80000; auto const rom_size = region->bytes();
for (int i = 0; i < rom_size / 2; i++) for (int i = 0; i < rom_size / 2; i++)
{ {
uint16_t x = src[i]; uint16_t x = 0;
IGS27_CRYPT1 IGS27_CRYPT1
IGS27_CRYPT2_ALT IGS27_CRYPT2_ALT
@ -1332,15 +1288,15 @@ void superkds_decrypt(running_machine &machine)
x ^= superkds_tab[(i >> 1) & 0xff] << 8; x ^= superkds_tab[(i >> 1) & 0xff] << 8;
src[i] = x; src[i] ^= x;
} }
} }
void fearless_decrypt(running_machine &machine) void fearless_decrypt(running_machine &machine)
{ {
auto const src = util::little_endian_cast<u16>(reinterpret_cast<u32 *>(machine.root_device().memregion("user1")->base())); memory_region *const region = machine.root_device().memregion("user1");
auto const src = util::little_endian_cast<u16>(reinterpret_cast<u32 *>(region->base()));
int const rom_size = 0x80000; auto const rom_size = region->bytes();
for (int i = 0; i < rom_size / 2; i++) for (int i = 0; i < rom_size / 2; i++)
{ {
@ -1417,7 +1373,7 @@ void slqz3_decrypt(running_machine &machine)
for (int i = 0; i < rom_size / 2; i++) for (int i = 0; i < rom_size / 2; i++)
{ {
uint16_t x = src[i]; uint16_t x = 0;
// not 100% verified // not 100% verified
IGS27_CRYPT1 IGS27_CRYPT1
@ -1429,7 +1385,7 @@ void slqz3_decrypt(running_machine &machine)
IGS27_CRYPT7 IGS27_CRYPT7
IGS27_CRYPT8 IGS27_CRYPT8
src[i] = x; src[i] ^= x;
} }
} }
@ -1444,7 +1400,7 @@ void fruitpar_decrypt(running_machine &machine)
// not 100% verified // not 100% verified
for (int i = 0; i < rom_size / 2; i++) for (int i = 0; i < rom_size / 2; i++)
{ {
uint16_t x = src[i]; uint16_t x = 0;
IGS27_CRYPT1 IGS27_CRYPT1
IGS27_CRYPT2 IGS27_CRYPT2
@ -1455,7 +1411,7 @@ void fruitpar_decrypt(running_machine &machine)
IGS27_CRYPT7_ALT IGS27_CRYPT7_ALT
IGS27_CRYPT8 IGS27_CRYPT8
src[i] = x; src[i] ^= x;
} }
} }
@ -1468,7 +1424,7 @@ void oceanpar_decrypt(running_machine &machine)
// not 100% verified // not 100% verified
for (int i = 0; i < rom_size / 2; i++) for (int i = 0; i < rom_size / 2; i++)
{ {
uint16_t x = src[i]; uint16_t x = 0;
IGS27_CRYPT1_ALT IGS27_CRYPT1_ALT
IGS27_CRYPT2_ALT IGS27_CRYPT2_ALT
@ -1479,7 +1435,7 @@ void oceanpar_decrypt(running_machine &machine)
IGS27_CRYPT7_ALT IGS27_CRYPT7_ALT
IGS27_CRYPT8 IGS27_CRYPT8
src[i] = x; src[i] ^= x;
} }
} }
@ -1609,7 +1565,7 @@ void mgcs3_decrypt(running_machine &machine)
for (int i = 0; i < rom_size / 2; i++) for (int i = 0; i < rom_size / 2; i++)
{ {
uint16_t x = src[i]; uint16_t x = 0;
IGS27_CRYPT1 IGS27_CRYPT1
IGS27_CRYPT2 IGS27_CRYPT2
@ -1620,7 +1576,7 @@ void mgcs3_decrypt(running_machine &machine)
IGS27_CRYPT7_ALT IGS27_CRYPT7_ALT
IGS27_CRYPT8 IGS27_CRYPT8
src[i] = x; src[i] ^= x;
} }
} }
@ -1633,7 +1589,7 @@ void mgzz_decrypt(running_machine &machine)
for (int i = 0; i < rom_size / 2; i++) for (int i = 0; i < rom_size / 2; i++)
{ {
int x = src[i]; int x = 0;
IGS27_CRYPT1_ALT IGS27_CRYPT1_ALT
IGS27_CRYPT2 IGS27_CRYPT2
@ -1644,7 +1600,7 @@ void mgzz_decrypt(running_machine &machine)
IGS27_CRYPT7 IGS27_CRYPT7
IGS27_CRYPT8 IGS27_CRYPT8
src[i] = x; src[i] ^= x;
} }
} }
@ -1704,7 +1660,7 @@ void qlgs_decrypt(running_machine &machine)
for (int i = 0; i < rom_size / 2; i++) for (int i = 0; i < rom_size / 2; i++)
{ {
uint16_t x = src[i]; uint16_t x = 0;
// may need corrected // may need corrected
IGS27_CRYPT1_ALT IGS27_CRYPT1_ALT
@ -1716,7 +1672,7 @@ void qlgs_decrypt(running_machine &machine)
IGS27_CRYPT7 IGS27_CRYPT7
IGS27_CRYPT8 IGS27_CRYPT8
src[i] = x; src[i] ^= x;
} }
} }
@ -1729,7 +1685,7 @@ void jking02_decrypt(running_machine &machine)
for (int i = 0; i < rom_size / 2; i++) for (int i = 0; i < rom_size / 2; i++)
{ {
uint16_t x = src[i]; uint16_t x = 0;
// probably needs work... // probably needs work...
IGS27_CRYPT1 IGS27_CRYPT1
@ -1741,7 +1697,7 @@ void jking02_decrypt(running_machine &machine)
IGS27_CRYPT7 IGS27_CRYPT7
IGS27_CRYPT8 IGS27_CRYPT8
src[i] = x; src[i] ^= x;
} }
} }
@ -1903,13 +1859,13 @@ static const uint8_t icescape_tab[0x100] = {
void icescape_decrypt(running_machine &machine) void icescape_decrypt(running_machine &machine)
{ {
auto const src = util::little_endian_cast<u16>(reinterpret_cast<u32 *>(machine.root_device().memregion("user1")->base())); memory_region *const region = machine.root_device().memregion("user1");
auto const src = util::little_endian_cast<u16>(reinterpret_cast<u32 *>(region->base()));
int const rom_size = 0x80000; auto const rom_size = region->bytes();
for (int i = 0; i < rom_size / 2; i++) for (int i = 0; i < rom_size / 2; i++)
{ {
uint16_t x = src[i]; uint16_t x = 0;
IGS27_CRYPT1 IGS27_CRYPT1
IGS27_CRYPT2_ALT // $18ed0 IGS27_CRYPT2_ALT // $18ed0
@ -1922,7 +1878,7 @@ void icescape_decrypt(running_machine &machine)
x ^= icescape_tab[(i>> 1) & 0xff] << 8; x ^= icescape_tab[(i>> 1) & 0xff] << 8;
src[i] = x; src[i] ^= x;
} }
} }
@ -2026,7 +1982,7 @@ void lthy_decrypt(running_machine &machine)
for (int i = 0; i < rom_size / 2; i++) for (int i = 0; i < rom_size / 2; i++)
{ {
uint16_t x = src[i]; uint16_t x = 0;
IGS27_CRYPT1 IGS27_CRYPT1
IGS27_CRYPT2_ALT // correct-85a8 IGS27_CRYPT2_ALT // correct-85a8
@ -2037,7 +1993,7 @@ void lthy_decrypt(running_machine &machine)
IGS27_CRYPT7 // ? IGS27_CRYPT7 // ?
IGS27_CRYPT8 // correct 12c0 IGS27_CRYPT8 // correct 12c0
src[i] = x; src[i] ^= x;
} }
} }
@ -2050,7 +2006,7 @@ void lhdmg_decrypt(running_machine &machine)
for (int i = 0; i < rom_size / 2; i++) for (int i = 0; i < rom_size / 2; i++)
{ {
uint16_t x = src[i]; uint16_t x = 0;
IGS27_CRYPT1 IGS27_CRYPT1
IGS27_CRYPT2_ALT IGS27_CRYPT2_ALT
@ -2061,31 +2017,7 @@ void lhdmg_decrypt(running_machine &machine)
IGS27_CRYPT7 IGS27_CRYPT7
IGS27_CRYPT8 IGS27_CRYPT8
src[i] = x; src[i] ^= x;
}
}
void lhdmgp_decrypt(running_machine &machine)
{
memory_region *const region = machine.root_device().memregion("user1");
auto const src = util::little_endian_cast<u16>(reinterpret_cast<u32 *>(region->base()));
auto const rom_size = region->bytes();
for (int i = 0; i < rom_size / 2; i++)
{
uint16_t x = src[i];
IGS27_CRYPT1
IGS27_CRYPT2_ALT
IGS27_CRYPT3
IGS27_CRYPT4
IGS27_CRYPT5
IGS27_CRYPT6_ALT
IGS27_CRYPT7
IGS27_CRYPT8
src[i] = x;
} }
} }
@ -2114,4 +2046,3 @@ void extradrw_decrypt(running_machine &machine)
src[i] ^= x; src[i] ^= x;
} }
} }

9
src/mame/igs/pgmcrypt.h
View File

@ -1,6 +1,11 @@
// license:BSD-3-Clause // license:BSD-3-Clause
// copyright-holders: David Haywood, ElSemi // copyright-holders: David Haywood, ElSemi
// IGS 027 Encryptions // IGS 027 Encryptions
#ifndef MAME_IGS_PGMCRYPT_H
#define MAME_IGS_PGMCRYPT_H
#pragma once
void pgm_kov_decrypt(running_machine &machine); void pgm_kov_decrypt(running_machine &machine);
void pgm_kovsh_decrypt(running_machine &machine); void pgm_kovsh_decrypt(running_machine &machine);
@ -30,7 +35,6 @@ void klxyj_decrypt(running_machine &machine);
void zhongguo_decrypt(running_machine &machine); void zhongguo_decrypt(running_machine &machine);
void gonefsh2_decrypt(running_machine &machine); void gonefsh2_decrypt(running_machine &machine);
void sddz_decrypt(running_machine &machine); void sddz_decrypt(running_machine &machine);
void lhzb3_decrypt(running_machine &machine);
void lhzb4_decrypt(running_machine &machine); void lhzb4_decrypt(running_machine &machine);
void fearless_decrypt(running_machine &machine); void fearless_decrypt(running_machine &machine);
void superkds_decrypt(running_machine &machine); void superkds_decrypt(running_machine &machine);
@ -53,5 +57,6 @@ void tripfev_decrypt(running_machine &machine);
void wldfruit_decrypt(running_machine &machine); void wldfruit_decrypt(running_machine &machine);
void lthy_decrypt(running_machine &machine); void lthy_decrypt(running_machine &machine);
void lhdmg_decrypt(running_machine &machine); void lhdmg_decrypt(running_machine &machine);
void lhdmgp_decrypt(running_machine &machine);
void extradrw_decrypt(running_machine &machine); void extradrw_decrypt(running_machine &machine);
#endif // MAME_IGS_PGMCRYPT_H