#include "driver.h" /************************************************************************** Tile encryption --------------- The tile graphics encryption uses the same algorithm in all games, with different keys for the SPI, RISE10 and RISE11 custom chips. - Take 24 bits of gfx data (used to decrypt 4 pixels at 6 bpp) and perform a bit permutation on them (the permutation is the same in all games). - Take the low 12 bits of the tile code and add a 24-bit number (KEY1) to it. - Add the two 24-bit numbers resulting from the above steps, but with a catch: while performing the sum, some bits generate carry as usual, other bits don't, depending on a 24-bit key (KEY2). Note that the carry generated by bit 23 (if enabled) wraps around to bit 0. - XOR the result with a 24-bit number (KEY3). The decryption is actually programmable; the games write the key to the custom IC on startup!! (writes to 000414) **************************************************************************/ // add two numbers generating carry from one bit to the next only if // the corresponding bit in carry_mask is 1 static int partial_carry_sum(int add1,int add2,int carry_mask,int bits) { int i,res,carry; res = 0; carry = 0; for (i = 0;i < bits;i++) { int bit = BIT(add1,i) + BIT(add2,i) + carry; res += (bit & 1) << i; // generate carry only if the corresponding bit in carry_mask is 1 if (BIT(carry_mask,i)) carry = bit >> 1; else carry = 0; } // wrap around carry from top bit to bit 0 if (carry) res ^=1; return res; } static int partial_carry_sum24(int add1,int add2,int carry_mask) { return partial_carry_sum(add1,add2,carry_mask,24); } static int partial_carry_sum16(int add1,int add2,int carry_mask) { return partial_carry_sum(add1,add2,carry_mask,16); } static int partial_carry_sum8(int add1,int add2,int carry_mask) { return partial_carry_sum(add1,add2,carry_mask,8); } static UINT32 decrypt_tile(UINT32 val, int tileno, UINT32 key1, UINT32 key2, UINT32 key3) { val = BITSWAP24(val, 18,19,9,5, 10,17,16,20, 21,22,6,11, 15,14,4,23, 0,1,7,8, 13,12,3,2); return partial_carry_sum24( val, tileno + key1, key2 ) ^ key3; } static void decrypt_text(UINT8 *rom, UINT32 key1, UINT32 key2, UINT32 key3) { int i; for(i=0; i<0x10000; i++) { UINT32 w; w = (rom[(i*3) + 0] << 16) | (rom[(i*3) + 1] << 8) | (rom[(i*3) +2]); w = decrypt_tile(w, i >> 4, key1, key2, key3); rom[(i*3) + 0] = (w >> 16) & 0xff; rom[(i*3) + 1] = (w >> 8) & 0xff; rom[(i*3) + 2] = w & 0xff; } } static void decrypt_bg(UINT8 *rom, int size, UINT32 key1, UINT32 key2, UINT32 key3) { int i,j; for(j=0; j> 6, key1, key2, key3); rom[j + (i*3) + 0] = (w >> 16) & 0xff; rom[j + (i*3) + 1] = (w >> 8) & 0xff; rom[j + (i*3) + 2] = w & 0xff; } } } /****************************************************************************************** cpu #0 (PC=0033B2EB): unmapped program memory dword write to 00000414 = 00000000 & 0000FFFF cpu #0 (PC=0033B2EB): unmapped program memory dword write to 00000414 = 0000DF5B & 0000FFFF cpu #0 (PC=0033B2EB): unmapped program memory dword write to 00000414 = 000078CF & 0000FFFF cpu #0 (PC=0033B2EB): unmapped program memory dword write to 00000414 = 00001377 & 0000FFFF cpu #0 (PC=0033B2EB): unmapped program memory dword write to 00000414 = 00002538 & 0000FFFF cpu #0 (PC=0033B2EB): unmapped program memory dword write to 00000414 = 00004535 & 0000FFFF cpu #0 (PC=0033B2EB): unmapped program memory dword write to 00000414 = 06DC0000 & FFFF0000 ******************************************************************************************/ void seibuspi_text_decrypt(UINT8 *rom) { decrypt_text( rom, 0x5a3845, 0x77cf5b, 0x1378df); } void seibuspi_bg_decrypt(UINT8 *rom, int size) { decrypt_bg( rom, size, 0x5a3845, 0x77cf5b, 0x1378df); } /****************************************************************************************** cpu #0 (PC=002A097D): unmapped program memory dword write to 00000414 = 00000001 & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 00000414 = 0000DCF8 & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 00000414 = 00007AE2 & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 00000414 = 0000154D & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 00000414 = 00001731 & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 00000414 = 0000466B & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 00000414 = 3EDC0000 & FFFF0000 ******************************************************************************************/ /* RISE10 (Raiden Fighters 2) */ void seibuspi_rise10_text_decrypt(UINT8 *rom) { decrypt_text( rom, 0x823146, 0x4de2f8, 0x157adc); } void seibuspi_rise10_bg_decrypt(UINT8 *rom, int size) { decrypt_bg( rom, size, 0x823146, 0x4de2f8, 0x157adc); } /****************************************************************************************** cpu #0 (PC=002C40F9): unmapped program memory dword write to 00000414 = 00000001 & 0000FFFF cpu #0 (PC=002C40F9): unmapped program memory dword write to 00000414 = 00006630 & 0000FFFF cpu #0 (PC=002C40F9): unmapped program memory dword write to 00000414 = 0000B685 & 0000FFFF cpu #0 (PC=002C40F9): unmapped program memory dword write to 00000414 = 0000CCFE & 0000FFFF cpu #0 (PC=002C40F9): unmapped program memory dword write to 00000414 = 000032A7 & 0000FFFF cpu #0 (PC=002C40F9): unmapped program memory dword write to 00000414 = 0000547C & 0000FFFF cpu #0 (PC=002C40F9): unmapped program memory dword write to 00000414 = 3EDC0000 & FFFF0000 ******************************************************************************************/ /* RISE11 (Raiden Fighters Jet) */ void seibuspi_rise11_text_decrypt(UINT8 *rom) { decrypt_text( rom, 0xaea754, 0xfe8530, 0xccb666); } void seibuspi_rise11_bg_decrypt(UINT8 *rom, int size) { decrypt_bg( rom, size, 0xaea754, 0xfe8530, 0xccb666); } static int dec12(int val) { return partial_carry_sum16( val, 0x018a, 0x018a ) ^ 0xccd8; } static int dec3(int val) { return partial_carry_sum8( val, 0x05, 0x1d ) ^ 0x6c; } static int dec4(int val) { return partial_carry_sum8( val, 0x42, 0x46 ) ^ 0xa2; } static int dec5(int val) { return partial_carry_sum8( val, 0x21, 0x27 ) ^ 0x52; } static int dec6(int val) { return partial_carry_sum8( val, 0x08, 0x08 ) ^ 0x3a; } static void sprite_reorder(UINT8 *buffer) { int j; UINT8 temp[64]; for( j=0; j < 16; j++ ) { temp[2*(j*2)+0] = buffer[2*j+0]; temp[2*(j*2)+1] = buffer[2*j+1]; temp[2*(j*2)+2] = buffer[2*j+32]; temp[2*(j*2)+3] = buffer[2*j+33]; } memcpy(buffer, temp, 64); } /* actually this is for the 2000 version - original version might be different */ void seibuspi_rise10_sprite_decrypt(UINT8 *rom, int size) { int i,j; int s = size/2; for( i=0; i < s; i+=32 ) { sprite_reorder(&rom[2*i]); sprite_reorder(&rom[2*(s+i)]); sprite_reorder(&rom[2*((s*2)+i)]); for( j=0; j < 32; j++ ) { int b1,b2; int d12,d3,d4,d5,d6; b1 = rom[2*((s*2)+i+j)] + (rom[2*((s*2)+i+j)+1] << 8) + (rom[2*(s+i+j)] << 16) + (rom[2*(s+i+j)+1] << 24); b1 = BITSWAP32(b1, 7,31,26,0,18,9,19,8, 27,6,15,21,1,28,10,20, 3,5,29,17,14,22,2,11, 23,13,24,4,16,12,25,30); b2 = rom[2*(i+j)] + (rom[2*(i+j)+1] << 8); d12 = dec12(b2); d3 = dec3((b1 >> 0) & 0xff); d4 = dec4((b1 >> 8) & 0xff); d5 = dec5((b1 >> 16) & 0xff); d6 = dec6((b1 >> 24) & 0xff); rom[2*(i+j)] = d12 >> 8; rom[2*(i+j)+1] = d12; rom[2*(s+i+j)] = d3; rom[2*(s+i+j)+1] = d4; rom[2*((s*2)+i+j)] = d5; rom[2*((s*2)+i+j)+1] = d6; } } } /****************************************************************************************** rf2_eur (we don't have the gfx ROMs for this one) cpu #0 (PC=002A097D): unmapped program memory dword write to 0000054C = 00000000 & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 0000054C = 0000ABCB & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 0000054C = 0000ABCB & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 0000054C = 00006543 & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 0000054C = 000021D9 & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 0000054C = 00006655 & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 0000054C = 000099AA & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 0000054C = 00006655 & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 0000054C = 000099AA & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 0000054C = 00000C1D & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 0000054C = 0000A346 & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 0000054C = 00005237 & 0000FFFF cpu #0 (PC=002A097D): unmapped program memory dword write to 0000054C = 0000A948 & 0000FFFF plane543 = partial_carry_sum24( plane543, 0x??????, 0x??2199 ) ^ 0x??d9aa; plane210 = partial_carry_sum24( plane210, i, 0x990c52 ) ^ 0xaa1d37; rfjet cpu #0 (PC=002C40F9): unmapped program memory dword write to 0000054C = 00000000 & 0000FFFF cpu #0 (PC=002C40F9): unmapped program memory dword write to 0000054C = 00000000 & 0000FFFF cpu #0 (PC=002C40F9): unmapped program memory dword write to 0000054C = 000055AB & 0000FFFF cpu #0 (PC=002C40F9): unmapped program memory dword write to 0000054C = 00000000 & 0000FFFF cpu #0 (PC=002C40F9): unmapped program memory dword write to 0000054C = 0000AA6A & 0000FFFF // cpu #0 (PC=002C40F9): unmapped program memory dword write to 0000054C = 0000ABCB & 0000FFFF cpu #0 (PC=002C40F9): unmapped program memory dword write to 0000054C = 0000DD4C & 0000FFFF // cpu #0 (PC=002C40F9): unmapped program memory dword write to 0000054C = 00006543 & 0000FFFF cpu #0 (PC=002C40F9): unmapped program memory dword write to 0000054C = 0000D68B & 0000FFFF // cpu #0 (PC=002C40F9): unmapped program memory dword write to 0000054C = 000037F2 & 0000FFFF // cpu #0 (PC=002C40F9): unmapped program memory dword write to 0000054C = 000021D9 & 0000FFFF cpu #0 (PC=002C40F9): unmapped program memory dword write to 0000054C = 00005B3B & 0000FFFF // cpu #0 (PC=002C40F9): unmapped program memory dword write to 0000054C = 00000300 & 0000FFFF plane543 = partial_carry_sum24( plane543, 0x01cb64, 0x01aadd ) ^ 0x016a4c; plane210 = partial_carry_sum24( plane210, i, 0xd6375b ) ^ 0x8bf23b; ******************************************************************************************/ void seibuspi_rise11_sprite_decrypt(UINT8 *rom, int size) { int i; for (i = 0; i < size/2; i++) { int b1,b2,b3; int plane543,plane210; b1 = rom[0*size+2*i] + (rom[0*size+2*i+1] << 8); b2 = rom[1*size+2*i] + (rom[1*size+2*i+1] << 8); b3 = rom[2*size+2*i] + (rom[2*size+2*i+1] << 8); plane543 = (BIT(b2,11)<< 0) | (BIT(b1, 6)<< 1) | (BIT(b3,12)<< 2) | (BIT(b3, 3)<< 3) | (BIT(b2,12)<< 4) | (BIT(b3,14)<< 5) | (BIT(b3, 4)<< 6) | (BIT(b1,11)<< 7) | (BIT(b1,12)<< 8) | (BIT(b1, 2)<< 9) | (BIT(b2, 5)<<10) | (BIT(b1, 9)<<11) | (BIT(b3, 1)<<12) | (BIT(b2, 2)<<13) | (BIT(b2,10)<<14) | (BIT(b3, 5)<<15) | (BIT(b1, 3)<<16) | (BIT(b2, 7)<<17) | (BIT(b1,15)<<18) | (BIT(b3, 9)<<19) | (BIT(b2,13)<<20) | (BIT(b1, 4)<<21) | (BIT(b3, 2)<<22) | (BIT(b2, 0)<<23); plane210 = (BIT(b1,14)<< 0) | (BIT(b1, 1)<< 1) | (BIT(b1,13)<< 2) | (BIT(b3, 0)<< 3) | (BIT(b1, 7)<< 4) | (BIT(b2,14)<< 5) | (BIT(b2, 4)<< 6) | (BIT(b2, 9)<< 7) | (BIT(b3, 8)<< 8) | (BIT(b2, 1)<< 9) | (BIT(b3, 7)<<10) | (BIT(b2, 6)<<11) | (BIT(b1, 0)<<12) | (BIT(b3,11)<<13) | (BIT(b2, 8)<<14) | (BIT(b3,13)<<15) | (BIT(b1, 8)<<16) | (BIT(b3,10)<<17) | (BIT(b3, 6)<<18) | (BIT(b1,10)<<19) | (BIT(b2,15)<<20) | (BIT(b2, 3)<<21) | (BIT(b1, 5)<<22) | (BIT(b3,15)<<23); plane543 = partial_carry_sum24( plane543, 0x01cb64, 0x01aadd ) ^ 0x016a4c; plane210 = partial_carry_sum24( plane210, i, 0xd6375b ) ^ 0x8bf23b; rom[0*size+2*i] = plane543 >> 16; rom[0*size+2*i+1] = plane543 >> 8; rom[1*size+2*i] = plane543 >> 0; rom[1*size+2*i+1] = plane210 >> 16; rom[2*size+2*i] = plane210 >> 8; rom[2*size+2*i+1] = plane210 >> 0; } for (i = 0; i < size/2; i += 32) { sprite_reorder(&rom[0*size+2*i]); sprite_reorder(&rom[1*size+2*i]); sprite_reorder(&rom[2*size+2*i]); } }