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315-5881_crypt.c: Key scheduling simplifications [Andreas Naive]

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andreasnaive 2015-01-23 12:41:46 +01:00
parent 2d38bb00ca
commit 34e78381dd
2 changed files with 25 additions and 29 deletions
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50
src/mame/machine/315-5881_crypt.c
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@ -234,10 +234,10 @@ const sega_315_5881_crypt_device::sbox sega_315_5881_crypt_device::fn1_sboxes[4]
{
{
2,2,2,3,1,1,0,1,0,1,2,2,3,3,0,2,0,3,2,3,3,0,2,1,0,3,1,0,0,2,3,2,
3,2,0,3,2,0,1,0,3,3,1,1,2,2,2,0,2,1,3,1,1,1,1,2,2,2,3,0,1,3,0,0,
2,2,2,3,1,1,0,1,3,3,1,1,2,2,2,0,0,3,2,3,3,0,2,1,2,2,3,0,1,3,0,0,
3,2,0,3,2,0,1,0,0,1,2,2,3,3,0,2,2,1,3,1,1,1,1,2,0,3,1,0,0,2,3,2,
},
{1,2,5,6,7,-1},
{1,2,5,6,7,6},
{2,7}
},
@ -341,10 +341,10 @@ const sega_315_5881_crypt_device::sbox sega_315_5881_crypt_device::fn2_sboxes[4]
{
{
0,2,3,2,1,1,0,0,2,1,0,3,3,0,0,0,3,2,0,2,1,1,2,1,0,0,3,1,2,2,3,1,
3,1,3,0,0,0,1,3,1,0,0,3,2,2,3,1,1,3,0,0,2,1,3,3,1,3,1,2,3,1,2,1,
0,1,3,0,1,1,2,3,2,0,0,3,2,1,3,1,3,3,0,0,1,0,0,3,0,3,3,2,3,2,0,1,
3,2,3,2,2,1,3,1,1,1,0,3,3,2,2,1,1,2,0,2,0,1,1,0,1,0,1,1,2,0,3,0,
},
{0,3,5,6,-1,-1},
{0,3,5,6,5,0},
{1,2}
},
@ -387,10 +387,10 @@ const sega_315_5881_crypt_device::sbox sega_315_5881_crypt_device::fn2_sboxes[4]
{
{
1,2,3,2,0,3,2,3,0,1,1,0,0,2,2,3,2,0,0,3,0,2,3,3,2,2,1,0,2,1,0,3,
1,0,2,0,1,1,0,1,0,0,1,0,3,0,3,3,2,2,0,2,1,1,1,0,3,0,1,3,2,3,2,1,
1,0,3,0,0,1,2,1,0,0,1,0,0,0,2,3,2,2,0,2,0,1,3,0,2,0,1,3,2,3,0,1,
1,2,2,2,1,3,0,3,0,1,1,0,3,2,3,3,2,0,0,3,1,2,1,3,3,2,1,0,2,1,2,3,
},
{2,3,4,6,7,-1},
{2,3,4,6,7,2},
{2,3}
},
@ -406,10 +406,10 @@ const sega_315_5881_crypt_device::sbox sega_315_5881_crypt_device::fn2_sboxes[4]
{ // 3rd round
{
{
0,3,0,1,0,2,3,3,1,0,1,3,2,2,1,1,3,3,3,0,2,0,2,0,0,0,2,3,1,1,0,0,
3,3,0,3,3,0,0,2,1,1,1,0,2,2,2,0,3,0,3,1,2,2,0,3,0,0,3,2,0,3,2,1,
0,3,0,1,3,0,0,2,1,0,1,3,2,2,2,0,3,3,3,0,2,2,0,3,0,0,2,3,0,3,2,1,
3,3,0,3,0,2,3,3,1,1,1,0,2,2,1,1,3,0,3,1,2,0,2,0,0,0,3,2,1,1,0,0,
},
{1,4,5,6,7,-1},
{1,4,5,6,7,5},
{0,5}
},
@ -424,11 +424,11 @@ const sega_315_5881_crypt_device::sbox sega_315_5881_crypt_device::fn2_sboxes[4]
{
{
2,2,3,2,0,3,2,3,1,1,2,0,2,3,1,3,0,0,0,3,2,0,1,0,1,3,2,3,3,3,1,0,
2,2,0,3,0,3,1,0,1,1,2,3,2,3,1,0,0,0,3,2,2,0,2,3,1,3,2,0,3,3,1,3,
// unused?
255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,
},
{1,2,4,7,-1,-1},
{1,2,4,7,2,-1},
{2,4}
},
@ -481,19 +481,18 @@ const sega_315_5881_crypt_device::sbox sega_315_5881_crypt_device::fn2_sboxes[4]
};
const int sega_315_5881_crypt_device::fn1_game_key_scheduling[FN1GK][2] = {
{1,29}, {1,71}, {2,4}, {2,54}, {3,8}, {4,56}, {4,73}, {5,11},
{6,51}, {7,92}, {8,89}, {9,9}, {9,39}, {9,41}, {9,58}, {9,86},
{10,90}, {11,6}, {12,64}, {13,49}, {14,44}, {15,40}, {16,69}, {17,15},
{18,23}, {18,43}, {19,82}, {20,81}, {21,32}, {22,5}, {23,66}, {24,13},
{24,45}, {25,12}, {25,35}, {26,61}, {27,10}, {27,59}, {28,25}
{1,29}, {1,71}, {2,4}, {2,54}, {3,8}, {4,56}, {4,73}, {5,11},
{6,51}, {7,92}, {8,89}, {9,9}, {9,39}, {9,58}, {9,86}, {10,90},
{11,6}, {12,64}, {13,49}, {14,44}, {15,40}, {16,69}, {17,15}, {18,23},
{18,43}, {19,82}, {20,81}, {21,32}, {22,5}, {23,66}, {24,13}, {24,45},
{25,12}, {25,35}, {26,61}, {27,10}, {27,59}, {28,25}
};
const int sega_315_5881_crypt_device::fn2_game_key_scheduling[FN2GK][2] = {
{0,0}, {1,3}, {2,11}, {3,20}, {4,22}, {5,23}, {6,29}, {7,38},
{8,39}, {9,55}, {9,86}, {9,87}, {9,90}, {10,50}, {10,53}, {11,57},
{12,59}, {13,61}, {13,64}, {14,63}, {15,67}, {16,72}, {17,83}, {18,88},
{19,94}, {20,35}, {21,17}, {22,6}, {22,11}, {23,85}, {24,16}, {25,25},
{26,92}, {27,47}, {28,28}
{0,0}, {1,3}, {2,11}, {3,20}, {4,22}, {5,23}, {6,29}, {7,38},
{8,39}, {9,55}, {9,86}, {9,87}, {9,90}, {10,50}, {11,57}, {12,59},
{13,61}, {14,63}, {15,67}, {16,72}, {17,83}, {18,88}, {19,94}, {20,35},
{21,17}, {22,6}, {23,85}, {24,16}, {25,25}, {26,92}, {27,47}, {28,28}
};
const int sega_315_5881_crypt_device::fn1_sequence_key_scheduling[20][2] = {
@ -583,9 +582,6 @@ UINT16 sega_315_5881_crypt_device::block_decrypt(UINT32 game_key, UINT16 sequenc
}
}
// subkeys bits 10 & 41
fn2_subkeys[0] ^= (BIT(sequence_key, 2) << 10);
fn2_subkeys[1] ^= (BIT(sequence_key, 4) << 17);
/**************************************************************/
// First Feistel Network

4
src/mame/machine/315-5881_crypt.h
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@ -74,8 +74,8 @@ private:
static const sbox fn1_sboxes[4][4];
static const sbox fn2_sboxes[4][4];
static const int FN1GK = 39;
static const int FN2GK = 35;
static const int FN1GK = 38;
static const int FN2GK = 32;
static const int fn1_game_key_scheduling[FN1GK][2];
static const int fn2_game_key_scheduling[FN2GK][2];
static const int fn1_sequence_key_scheduling[20][2];