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-rw-r--r--src/common/grfio.c186
1 files changed, 64 insertions, 122 deletions
diff --git a/src/common/grfio.c b/src/common/grfio.c
index 1d1ce756f..eefeb8296 100644
--- a/src/common/grfio.c
+++ b/src/common/grfio.c
@@ -2,8 +2,9 @@
// For more information, see LICENCE in the main folder
#include "../common/cbasetypes.h"
-#include "../common/showmsg.h"
+#include "../common/des.h"
#include "../common/malloc.h"
+#include "../common/showmsg.h"
#include "../common/strlib.h"
#include "../common/utils.h"
#include "grfio.h"
@@ -57,63 +58,12 @@ char data_dir[1024] = "";
//----------------------------
int filelist_hash[256];
-//----------------------------
-// grf decode data table
-//----------------------------
-static unsigned char BitMaskTable[8] = {
- 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01
-};
-
-static char BitSwapTable1[64] = {
- 58, 50, 42, 34, 26, 18, 10, 2, 60, 52, 44, 36, 28, 20, 12, 4,
- 62, 54, 46, 38, 30, 22, 14, 6, 64, 56, 48, 40, 32, 24, 16, 8,
- 57, 49, 41, 33, 25, 17, 9, 1, 59, 51, 43, 35, 27, 19, 11, 3,
- 61, 53, 45, 37, 29, 21, 13, 5, 63, 55, 47, 39, 31, 23, 15, 7
-};
-static char BitSwapTable2[64] = {
- 40, 8, 48, 16, 56, 24, 64, 32, 39, 7, 47, 15, 55, 23, 63, 31,
- 38, 6, 46, 14, 54, 22, 62, 30, 37, 5, 45, 13, 53, 21, 61, 29,
- 36, 4, 44, 12, 52, 20, 60, 28, 35, 3, 43, 11, 51, 19, 59, 27,
- 34, 2, 42, 10, 50, 18, 58, 26, 33, 1, 41, 9, 49, 17, 57, 25
-};
-static char BitSwapTable3[32] = {
- 16, 7, 20, 21, 29, 12, 28, 17, 1, 15, 23, 26, 5, 18, 31, 10,
- 2, 8, 24, 14, 32, 27, 3, 9, 19, 13, 30, 6, 22, 11, 4, 25
-};
-
-static unsigned char NibbleData[4][64]={
- {
- 0xef, 0x03, 0x41, 0xfd, 0xd8, 0x74, 0x1e, 0x47, 0x26, 0xef, 0xfb, 0x22, 0xb3, 0xd8, 0x84, 0x1e,
- 0x39, 0xac, 0xa7, 0x60, 0x62, 0xc1, 0xcd, 0xba, 0x5c, 0x96, 0x90, 0x59, 0x05, 0x3b, 0x7a, 0x85,
- 0x40, 0xfd, 0x1e, 0xc8, 0xe7, 0x8a, 0x8b, 0x21, 0xda, 0x43, 0x64, 0x9f, 0x2d, 0x14, 0xb1, 0x72,
- 0xf5, 0x5b, 0xc8, 0xb6, 0x9c, 0x37, 0x76, 0xec, 0x39, 0xa0, 0xa3, 0x05, 0x52, 0x6e, 0x0f, 0xd9,
- }, {
- 0xa7, 0xdd, 0x0d, 0x78, 0x9e, 0x0b, 0xe3, 0x95, 0x60, 0x36, 0x36, 0x4f, 0xf9, 0x60, 0x5a, 0xa3,
- 0x11, 0x24, 0xd2, 0x87, 0xc8, 0x52, 0x75, 0xec, 0xbb, 0xc1, 0x4c, 0xba, 0x24, 0xfe, 0x8f, 0x19,
- 0xda, 0x13, 0x66, 0xaf, 0x49, 0xd0, 0x90, 0x06, 0x8c, 0x6a, 0xfb, 0x91, 0x37, 0x8d, 0x0d, 0x78,
- 0xbf, 0x49, 0x11, 0xf4, 0x23, 0xe5, 0xce, 0x3b, 0x55, 0xbc, 0xa2, 0x57, 0xe8, 0x22, 0x74, 0xce,
- }, {
- 0x2c, 0xea, 0xc1, 0xbf, 0x4a, 0x24, 0x1f, 0xc2, 0x79, 0x47, 0xa2, 0x7c, 0xb6, 0xd9, 0x68, 0x15,
- 0x80, 0x56, 0x5d, 0x01, 0x33, 0xfd, 0xf4, 0xae, 0xde, 0x30, 0x07, 0x9b, 0xe5, 0x83, 0x9b, 0x68,
- 0x49, 0xb4, 0x2e, 0x83, 0x1f, 0xc2, 0xb5, 0x7c, 0xa2, 0x19, 0xd8, 0xe5, 0x7c, 0x2f, 0x83, 0xda,
- 0xf7, 0x6b, 0x90, 0xfe, 0xc4, 0x01, 0x5a, 0x97, 0x61, 0xa6, 0x3d, 0x40, 0x0b, 0x58, 0xe6, 0x3d,
- }, {
- 0x4d, 0xd1, 0xb2, 0x0f, 0x28, 0xbd, 0xe4, 0x78, 0xf6, 0x4a, 0x0f, 0x93, 0x8b, 0x17, 0xd1, 0xa4,
- 0x3a, 0xec, 0xc9, 0x35, 0x93, 0x56, 0x7e, 0xcb, 0x55, 0x20, 0xa0, 0xfe, 0x6c, 0x89, 0x17, 0x62,
- 0x17, 0x62, 0x4b, 0xb1, 0xb4, 0xde, 0xd1, 0x87, 0xc9, 0x14, 0x3c, 0x4a, 0x7e, 0xa8, 0xe2, 0x7d,
- 0xa0, 0x9f, 0xf6, 0x5c, 0x6a, 0x09, 0x8d, 0xf0, 0x0f, 0xe3, 0x53, 0x25, 0x95, 0x36, 0x28, 0xcb,
- }
-};
-
// little endian char array to uint conversion
static unsigned int getlong(unsigned char* p)
{
return (p[0] | p[1] << 0x08 | p[2] << 0x10 | p[3] << 0x18);
}
-/*==========================================
- * Grf data decode : Subs
- *------------------------------------------*/
static void NibbleSwap(unsigned char* Src, int len)
{
for(;0<len;len--,Src++) {
@@ -121,94 +71,88 @@ static void NibbleSwap(unsigned char* Src, int len)
}
}
-static void BitConvert(unsigned char* Src, char* BitSwapTable)
+
+/// Substitutes some specific values for others, leaves rest intact. Obfuscation.
+/// NOTE: Operation is symmetric (calling it twice gives back the original input).
+static uint8_t grf_substitution(uint8_t in)
{
- int lop,prm;
- unsigned char tmp[8];
- memset(tmp,0,8);
- for(lop=0;lop!=64;lop++) {
- prm = BitSwapTable[lop]-1;
- if (Src[(prm >> 3) & 7] & BitMaskTable[prm & 7]) {
- tmp[(lop >> 3) & 7] |= BitMaskTable[lop & 7];
- }
+ uint8_t out;
+
+ switch( in )
+ {
+ case 0x00: out = 0x2B; break;
+ case 0x2B: out = 0x00; break;
+ case 0x6C: out = 0x80; break;
+ case 0x01: out = 0x68; break;
+ case 0x68: out = 0x01; break;
+ case 0x48: out = 0x77; break;
+ case 0x60: out = 0xFF; break;
+ case 0x77: out = 0x48; break;
+ case 0xB9: out = 0xC0; break;
+ case 0xC0: out = 0xB9; break;
+ case 0xFE: out = 0xEB; break;
+ case 0xEB: out = 0xFE; break;
+ case 0x80: out = 0x6C; break;
+ case 0xFF: out = 0x60; break;
+ default: out = in; break;
}
- memcpy(Src,tmp,8);
+
+ return out;
}
-static void BitConvert4(unsigned char* Src)
+
+static void grf_shuffle_enc(BIT64* src)
{
- int lop,prm;
- unsigned char tmp[8];
- tmp[0] = ((Src[7]<<5) | (Src[4]>>3)) & 0x3f; // ..0 vutsr
- tmp[1] = ((Src[4]<<1) | (Src[5]>>7)) & 0x3f; // ..srqpo n
- tmp[2] = ((Src[4]<<5) | (Src[5]>>3)) & 0x3f; // ..o nmlkj
- tmp[3] = ((Src[5]<<1) | (Src[6]>>7)) & 0x3f; // ..kjihg f
- tmp[4] = ((Src[5]<<5) | (Src[6]>>3)) & 0x3f; // ..g fedcb
- tmp[5] = ((Src[6]<<1) | (Src[7]>>7)) & 0x3f; // ..cba98 7
- tmp[6] = ((Src[6]<<5) | (Src[7]>>3)) & 0x3f; // ..8 76543
- tmp[7] = ((Src[7]<<1) | (Src[4]>>7)) & 0x3f; // ..43210 v
-
- for(lop=0;lop!=4;lop++) {
- tmp[lop] = (NibbleData[lop][tmp[lop*2]] & 0xf0)
- | (NibbleData[lop][tmp[lop*2+1]] & 0x0f);
- }
+ BIT64 out;
+
+ out.b[0] = src->b[3];
+ out.b[1] = src->b[4];
+ out.b[2] = src->b[5];
+ out.b[3] = src->b[0];
+ out.b[4] = src->b[1];
+ out.b[5] = src->b[6];
+ out.b[6] = src->b[2];
+ out.b[7] = grf_substitution(src->b[7]);
+
+ *src = out;
+}
- memset(tmp+4,0,4);
- for(lop=0;lop!=32;lop++) {
- prm = BitSwapTable3[lop]-1;
- if (tmp[prm >> 3] & BitMaskTable[prm & 7]) {
- tmp[(lop >> 3) + 4] |= BitMaskTable[lop & 7];
- }
- }
- Src[0] ^= tmp[4];
- Src[1] ^= tmp[5];
- Src[2] ^= tmp[6];
- Src[3] ^= tmp[7];
+
+static void grf_shuffle_dec(BIT64* src)
+{
+ BIT64 out;
+
+ out.b[0] = src->b[3];
+ out.b[1] = src->b[4];
+ out.b[2] = src->b[6];
+ out.b[3] = src->b[0];
+ out.b[4] = src->b[1];
+ out.b[5] = src->b[2];
+ out.b[6] = src->b[5];
+ out.b[7] = grf_substitution(src->b[7]);
+
+ *src = out;
}
+
static void decode_des_etc(unsigned char* buf, size_t len, int type, int cycle)
{
+ BIT64* p = (BIT64*)buf;
+
size_t lop,cnt=0;
if(cycle<3) cycle=3;
else if(cycle<5) cycle++;
else if(cycle<7) cycle+=9;
else cycle+=15;
- for(lop=0; lop*8<len; lop++, buf+=8)
+ for(lop=0; lop*8<len; lop++)
{
if(lop<20 || (type==0 && lop%cycle==0)) { // des
- BitConvert(buf,BitSwapTable1);
- BitConvert4(buf);
- BitConvert(buf,BitSwapTable2);
+ des_decrypt_block(&p[lop]);
} else {
if(cnt==7 && type==0) {
- unsigned char a;
- unsigned char tmp[8];
- memcpy(tmp,buf,8);
+ grf_shuffle_dec(&p[lop]);
cnt=0;
- buf[0]=tmp[3];
- buf[1]=tmp[4];
- buf[2]=tmp[6];
- buf[3]=tmp[0];
- buf[4]=tmp[1];
- buf[5]=tmp[2];
- buf[6]=tmp[5];
- a=tmp[7];
- if(a==0x00) a=0x2b;
- else if(a==0x2b) a=0x00;
- else if(a==0x01) a=0x68;
- else if(a==0x68) a=0x01;
- else if(a==0x48) a=0x77;
- else if(a==0x77) a=0x48;
- else if(a==0x60) a=0xff;
- else if(a==0xff) a=0x60;
- else if(a==0x6c) a=0x80;
- else if(a==0x80) a=0x6c;
- else if(a==0xb9) a=0xc0;
- else if(a==0xc0) a=0xb9;
- else if(a==0xeb) a=0xfe;
- else if(a==0xfe) a=0xeb;
- buf[7]=a;
}
cnt++;
}
@@ -479,9 +423,7 @@ static char* decode_filename(unsigned char* buf, int len)
int lop;
for(lop=0;lop<len;lop+=8) {
NibbleSwap(&buf[lop],8);
- BitConvert(&buf[lop],BitSwapTable1);
- BitConvert4(&buf[lop]);
- BitConvert(&buf[lop],BitSwapTable2);
+ des_decrypt(&buf[lop],8);
}
return (char*)buf;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-27 00:21:26 +0000