逆向工程来自汽车的8位校验和
逆向工程来自汽车的8位校验和
提问于 2018-06-01 20:38:09
我正在尝试对汽车方向盘生成的CAN总线代码进行逆向工程。我只对一条消息感兴趣，这条消息包含了有关方向盘上哪个按钮被按下的信息。我已经为许多不同的汽车这样做了，但这一辆是特别的(?)我找到了包含ID 0x3D4的数据的消息。因此，我多次使用/不使用方向盘按钮的不同组合来记录此特定消息。
汽车的工作方式(大多数时候)是，当按钮被按下时，单个比特将从0切换到1。并在释放按钮时返回到0。此消息的DLC为8，因此可能有足够的空间容纳64个按钮。现在，对于这辆车，他们使用了第二个字节的4位作为计数器，从0计数到F。第一个字节是导致问题的字节。我不明白它是如何生成的。它似乎依赖于其他字节的值，但并不遵循标准的CRC算法...似乎它还取决于字节的位置...按下汽车上的按钮将改变数据中的一位，然后改变第一个字节的值。如果我在没有更改第一个字节的情况下向汽车生成一个假命令，汽车将不会对其做出反应。
我想知道第一个字节是如何生成的，这样我就可以自己生成它了。
DLC: 8
CAN总线高速500kb/s
CA 0E 80 00 00 04 00 00
1F 0F 80 00 00 04 00 00
ED 00 80 00 00 04 00 00
4A 01 81 00 00 04 00 00
01 02 81 00 00 04 00 00
4C 03 81 00 00 04 00 00
DC 04 81 00 00 04 00 00
37 05 81 00 00 04 00 00
1E 06 81 00 00 04 00 00
8B 07 80 00 00 04 00 00
25 08 80 00 00 04 00 00
70 09 80 00 00 04 00 00
6B 0A 80 00 00 04 00 00
9B 0B 81 00 00 04 00 00
BE 0C 81 00 00 04 00 00
41 0D 81 00 00 04 00 00
3E 0E 81 00 00 04 00 00
1F 0F 80 00 00 04 00 00
ED 00 80 00 00 04 00 00
BE 01 80 00 00 04 00 00
F5 02 80 00 00 04 00 00
B8 03 80 00 00 04 00 00我还发现以下消息共享相同的第一个字节：
7F 2D 84 00 00 04 00 00
7F 07 81 00 00 04 00 00
7F 03 82 00 00 04 00 00
4C 03 81 00 00 04 00 00
4C 00 84 00 00 04 00 00
4C 07 82 00 00 04 00 00
BE 0C 81 00 00 04 00 00
BE 01 80 00 00 04 00 00
BE 0F 84 00 00 04 00 00
BE 23 88 00 00 04 00 00更多数据：
70 09 80 00 00 04 00 00
6B 0A 80 00 00 04 00 00
9B 0B 81 00 00 04 00 00
BE 0C 81 00 00 04 00 00
41 0D 81 00 00 04 00 00
3E 0E 81 00 00 04 00 00
EB 0F 81 00 00 04 00 00
ED 00 80 00 00 04 00 00
BE 01 80 00 00 04 00 00
F5 02 80 00 00 04 00 00
B8 03 80 00 00 04 00 00
28 04 80 00 00 04 00 00
04 05 82 00 00 04 00 00
4B 06 84 00 00 04 00 00
2A 07 84 00 00 04 00 00
26 18 84 00 00 04 00 00
73 19 84 00 00 04 00 00
68 1A 84 00 00 04 00 00
6C 1B 84 00 00 04 00 00
49 1C 84 00 00 04 00 00
B6 1D 84 00 00 04 00 00
C9 1E 84 00 00 04 00 00
BE 0F 84 00 00 04 00 00
4C 00 84 00 00 04 00 00
1F 01 84 00 00 04 00 00
54 02 84 00 00 04 00 00
19 03 84 00 00 04 00 00
89 04 84 00 00 04 00 00
09 25 84 00 00 04 00 00
20 26 84 00 00 04 00 00
41 27 84 00 00 04 00 00
EF 28 84 00 00 04 00 00
BA 29 84 00 00 04 00 00
A1 2A 84 00 00 04 00 00
A5 2B 84 00 00 04 00 00
80 2C 84 00 00 04 00 00
7F 2D 84 00 00 04 00 00
00 2E 84 00 00 04 00 00
D5 2F 84 00 00 04 00 00
27 20 84 00 00 04 00 00
74 21 84 00 00 04 00 00
3F 22 84 00 00 04 00 00
19 03 84 00 00 04 00 00
2B 14 84 00 00 04 00 00
C0 15 84 00 00 04 00 00
E9 16 84 00 00 04 00 00
88 17 84 00 00 04 00 00
26 18 84 00 00 04 00 00
73 19 84 00 00 04 00 00
68 1A 84 00 00 04 00 00
6C 1B 84 00 00 04 00 00
49 1C 84 00 00 04 00 00
B6 1D 84 00 00 04 00 00
C9 1E 84 00 00 04 00 00
1C 1F 84 00 00 04 00 00
EE 10 84 00 00 04 00 00
BD 11 84 00 00 04 00 00
F6 12 84 00 00 04 00 00
BB 13 84 00 00 04 00 00
2B 14 84 00 00 04 00 00
0C 15 88 00 00 04 00 00
25 16 88 00 00 04 00 00
44 17 88 00 00 04 00 00
EA 18 88 00 00 04 00 00
BF 19 88 00 00 04 00 00
A4 1A 88 00 00 04 00 00
02 0B 88 00 00 04 00 00
27 0C 88 00 00 04 00 00
D8 0D 88 00 00 04 00 00
CC 2E 88 00 00 04 00 00
19 2F 88 00 00 04 00 00
EB 20 88 00 00 04 00 00
B8 21 88 00 00 04 00 00
F3 22 88 00 00 04 00 00
BE 23 88 00 00 04 00 00
2E 24 88 00 00 04 00 00
C5 25 88 00 00 04 00 00
EC 26 88 00 00 04 00 00
8D 27 88 00 00 04 00 00
23 28 88 00 00 04 00 00
76 29 88 00 00 04 00 00
6D 2A 88 00 00 04 00 00
69 2B 88 00 00 04 00 00
4C 2C 88 00 00 04 00 00
B3 2D 88 00 00 04 00 00
CC 2E 88 00 00 04 00 00
72 0F 88 00 00 04 00 00
80 00 88 00 00 04 00 00
D3 01 88 00 00 04 00 00
98 02 88 00 00 04 00 00
D5 03 88 00 00 04 00 00
45 04 88 00 00 04 00 00
AE 05 88 00 00 04 00 00
4B 06 84 00 00 04 00 00
2A 07 84 00 00 04 00 00
E2 08 82 00 00 04 00 00
B7 09 82 00 00 04 00 00
AC 0A 82 00 00 04 00 00
A8 0B 82 00 00 04 00 00
8D 0C 82 00 00 04 00 00
72 0D 82 00 00 04 00 00
0D 0E 82 00 00 04 00 00
D8 0F 82 00 00 04 00 00
2A 00 82 00 00 04 00 00
79 01 82 00 00 04 00 00
32 02 82 00 00 04 00 00
7F 03 82 00 00 04 00 00
EF 04 82 00 00 04 00 00
04 05 82 00 00 04 00 00
2D 06 82 00 00 04 00 00
4C 07 82 00 00 04 00 00
E2 08 82 00 00 04 00 00
B7 09 82 00 00 04 00 00
AC 0A 82 00 00 04 00 00
A8 0B 82 00 00 04 00 00
8D 0C 82 00 00 04 00 00
72 0D 82 00 00 04 00 00
0D 0E 82 00 00 04 00 00
D8 0F 82 00 00 04 00 00
2A 00 82 00 00 04 00 00
79 01 82 00 00 04 00 00
32 02 82 00 00 04 00 00
7F 03 82 00 00 04 00 00
EF 04 82 00 00 04 00 00
04 05 82 00 00 04 00 00
2D 06 82 00 00 04 00 00当我尝试所有可用的按钮时，已经记录了以下数据。+按钮的几个组合。
76 00 A0 00 00 04 00 00
25 01 A0 00 00 04 00 00
6E 02 A0 00 00 04 00 00
23 03 A0 00 00 04 00 00
B3 04 A0 00 00 04 00 00
58 05 A0 00 00 04 00 00
71 06 A0 00 00 04 00 00
10 07 A0 00 00 04 00 00
BE 08 A0 00 00 04 00 00
EB 09 A0 00 00 04 00 00
04 0A A1 00 00 04 00 00
00 0B A1 00 00 04 00 00
25 0C A1 00 00 04 00 00
DA 0D A1 00 00 04 00 00
A5 0E A1 00 00 04 00 00
84 0F A0 00 00 04 00 00
76 00 A0 00 00 04 00 00
25 01 A0 00 00 04 00 00
6E 02 A0 00 00 04 00 00
23 03 A0 00 00 04 00 00
B3 04 A0 00 00 04 00 00
9F 05 A2 00 00 04 00 00
D0 06 A4 00 00 04 00 00
B1 07 A4 00 00 04 00 00
D3 08 A8 00 00 04 00 00
86 09 A8 00 00 04 00 00
9D 0A A8 00 00 04 00 00
99 0B A8 00 00 04 00 00
70 0C A4 00 00 04 00 00
8F 0D A4 00 00 04 00 00
F0 0E A4 00 00 04 00 00
25 0F A4 00 00 04 00 00
B1 00 A2 00 00 04 00 00
E2 01 A2 00 00 04 00 00
A9 02 A2 00 00 04 00 00
23 03 A0 00 00 04 00 00
B3 04 A0 00 00 04 00 00
C3 05 80 00 00 04 00 00
30 06 90 00 00 04 00 00
51 07 90 00 00 04 00 00
25 08 80 00 00 04 00 00
70 09 80 00 00 04 00 00
6B 0A 80 00 00 04 00 00
6F 0B 80 00 00 04 00 00
4A 0C 80 00 00 04 00 00
B5 0D 80 00 00 04 00 00
CA 0E 80 00 00 04 00 00
1F 0F 80 00 00 04 00 00
ED 00 80 00 00 04 00 00
BE 01 80 00 00 04 00 00
01 02 81 00 00 04 00 00
4C 03 81 00 00 04 00 00
DC 04 81 00 00 04 00 00
37 05 81 00 00 04 00 00
1E 06 81 00 00 04 00 00
7F 07 81 00 00 04 00 00
D1 08 81 00 00 04 00 00
70 09 80 00 00 04 00 00
6B 0A 80 00 00 04 00 00
6F 0B 80 00 00 04 00 00
4A 0C 80 00 00 04 00 00
B5 0D 80 00 00 04 00 00
CA 0E 80 00 00 04 00 00
1F 0F 80 00 00 04 00 00
2A 00 82 00 00 04 00 00
79 01 82 00 00 04 00 00
32 02 82 00 00 04 00 00
7F 03 82 00 00 04 00 00
EF 04 82 00 00 04 00 00
04 05 82 00 00 04 00 00
2D 06 82 00 00 04 00 00
2A 07 84 00 00 04 00 00
84 08 84 00 00 04 00 00
D1 09 84 00 00 04 00 00
CA 0A 84 00 00 04 00 00
CE 0B 84 00 00 04 00 00
27 0C 88 00 00 04 00 00
D8 0D 88 00 00 04 00 00
A7 0E 88 00 00 04 00 00
72 0F 88 00 00 04 00 00
4C 00 84 00 00 04 00 00
1F 01 84 00 00 04 00 00
32 02 82 00 00 04 00 00
B8 03 80 00 00 04 00 00
28 04 80 00 00 04 00 00
C3 05 80 00 00 04 00 00
71 06 A0 00 00 04 00 00
10 07 A0 00 00 04 00 00
BE 08 A0 00 00 04 00 00
69 09 C0 00 00 04 00 00
72 0A C0 00 00 04 00 00
F4 0B A0 00 00 04 00 00
D1 0C A0 00 00 04 00 00
2E 0D A0 00 00 04 00 00
51 0E A0 00 00 04 00 00
84 0F A0 00 00 04 00 00
76 00 A0 00 00 04 00 00
25 01 A0 00 00 04 00 00
6E 02 A0 00 00 04 00 00
B8 03 80 00 00 04 00 00
28 04 80 00 00 04 00 00
C3 05 80 00 00 04 00 00
EA 06 80 00 00 04 00 00
8B 07 80 00 00 04 00 00
25 08 80 00 00 04 00 00
0F 09 80 04 00 04 00 00
14 0A 80 04 00 04 00 00
B8 0B 80 06 00 04 00 00
9D 0C 80 06 00 04 00 00
62 0D 80 06 00 04 00 00
1D 0E 80 06 00 04 00 00
C8 0F 80 06 00 04 00 00
3A 00 80 06 00 04 00 00
C1 01 80 04 00 04 00 00
8A 02 80 04 00 04 00 00
C7 03 80 04 00 04 00 00
57 04 80 04 00 04 00 00
BC 05 80 04 00 04 00 00
95 06 80 04 00 04 00 00
F4 07 80 04 00 04 00 00
5A 08 80 04 00 04 00 00
0F 09 80 04 00 04 00 00
14 0A 80 04 00 04 00 00
10 0B 80 04 00 04 00 00
35 0C 80 04 00 04 00 00
CA 0D 80 04 00 04 00 00
B5 0E 80 04 00 04 00 00
60 0F 80 04 00 04 00 00
92 00 80 04 00 04 00 00
C1 01 80 04 00 04 00 00
8A 02 80 04 00 04 00 00
C7 03 80 04 00 04 00 00
57 04 80 04 00 04 00 00
BC 05 80 04 00 04 00 00
95 06 80 04 00 04 00 00
F4 07 80 04 00 04 00 00
5A 08 80 04 00 04 00 00
0F 09 80 04 00 04 00 00
14 0A 80 04 00 04 00 00
10 0B 80 04 00 04 00 00
35 0C 80 04 00 04 00 00
CA 0D 80 04 00 04 00 00
B5 0E 80 04 00 04 00 00
60 0F 80 04 00 04 00 00
92 00 80 04 00 04 00 00
C1 01 80 04 00 04 00 00
8A 02 80 04 00 04 00 00
C7 03 80 04 00 04 00 00
57 04 80 04 00 04 00 00
BC 05 80 04 00 04 00 00
95 06 80 04 00 04 00 00
23 07 80 02 00 04 00 00
8D 08 80 02 00 04 00 00
D8 09 80 02 00 04 00 00
C3 0A 80 02 00 04 00 00
C7 0B 80 02 00 04 00 00
E2 0C 80 02 00 04 00 00
1D 0D 80 02 00 04 00 00
62 0E 80 02 00 04 00 00
B7 0F 80 02 00 04 00 00
45 00 80 02 00 04 00 00
16 01 80 02 00 04 00 00
5D 02 80 02 00 04 00 00
10 03 80 02 00 04 00 00
80 04 80 02 00 04 00 00
6B 05 80 02 00 04 00 00
42 06 80 02 00 04 00 00
23 07 80 02 00 04 00 00
25 08 80 00 00 04 00 00
70 09 80 00 00 04 00 00
6B 0A 80 00 00 04 00 00
6F 0B 80 00 00 04 00 00
4A 0C 80 00 00 04 00 00
1D 0D 80 02 00 04 00 00
B5 0E 80 04 00 04 00 00
60 0F 80 04 00 04 00 00
3A 00 80 06 00 04 00 00
69 01 80 06 00 04 00 00
22 02 80 06 00 04 00 00
6F 03 80 06 00 04 00 00
FF 04 80 06 00 04 00 00
14 05 80 06 00 04 00 00
3D 06 80 06 00 04 00 00
5C 07 80 06 00 04 00 00
F2 08 80 06 00 04 00 00
A7 09 80 06 00 04 00 00
BC 0A 80 06 00 04 00 00
B8 0B 80 06 00 04 00 00
9D 0C 80 06 00 04 00 00
62 0D 80 06 00 04 00 00
1D 0E 80 06 00 04 00 00
C8 0F 80 06 00 04 00 00
3A 00 80 06 00 04 00 00
69 01 80 06 00 04 00 00
22 02 80 06 00 04 00 00
6F 03 80 06 00 04 00 00
FF 04 80 06 00 04 00 00
14 05 80 06 00 04 00 00
3D 06 80 06 00 04 00 00
5C 07 80 06 00 04 00 00
F2 08 80 06 00 04 00 00
A7 09 80 06 00 04 00 00
BC 0A 80 06 00 04 00 00
10 0B 80 04 00 04 00 00
35 0C 80 04 00 04 00 00
1D 0D 80 02 00 04 00 00
62 0E 80 02 00 04 00 00
B7 0F 80 02 00 04 00 00
45 00 80 02 00 04 00 00
16 01 80 02 00 04 00 00
5D 02 80 02 00 04 00 00
10 03 80 02 00 04 00 00
80 04 80 02 00 04 00 00
6B 05 80 02 00 04 00 00
42 06 80 02 00 04 00 00
23 07 80 02 00 04 00 00
8D 08 80 02 00 04 00 00
D8 09 80 02 00 04 00 00
C3 0A 80 02 00 04 00 00
C7 0B 80 02 00 04 00 00
E2 0C 80 02 00 04 00 00
1D 0D 80 02 00 04 00 00
62 0E 80 02 00 04 00 00
B7 0F 80 02 00 04 00 00
45 00 80 02 00 04 00 00
16 01 80 02 00 04 00 00
5D 02 80 02 00 04 00 00
B8 03 80 00 00 04 00 00
28 04 80 00 00 04 00 00
C3 05 80 00 00 04 00 00
EA 06 80 00 00 04 00 00
4C 07 82 00 00 04 00 00
E2 08 82 00 00 04 00 00
B7 09 82 00 00 04 00 00
AC 0A 82 00 00 04 00 00
A8 0B 82 00 00 04 00 00
8D 0C 82 00 00 04 00 00
72 0D 82 00 00 04 00 00
0D 0E 82 00 00 04 00 00
D8 0F 82 00 00 04 00 00
2A 00 82 00 00 04 00 00
79 01 82 00 00 04 00 00
32 02 82 00 00 04 00 00
7F 03 82 00 00 04 00 00
EF 04 82 00 00 04 00 00
04 05 82 00 00 04 00 00
2D 06 82 00 00 04 00 00
4C 07 82 00 00 04 00 00
E2 08 82 00 00 04 00 00
B7 09 82 00 00 04 00 00
AC 0A 82 00 00 04 00 00
A8 0B 82 00 00 04 00 00
8D 0C 82 00 00 04 00 00
72 0D 82 00 00 04 00 00
0D 0E 82 00 00 04 00 00
D8 0F 82 00 00 04 00 00
2A 00 82 00 00 04 00 00
79 01 82 00 00 04 00 00
32 02 82 00 00 04 00 00
7F 03 82 00 00 04 00 00
EF 04 82 00 00 04 00 00
04 05 82 00 00 04 00 00
2D 06 82 00 00 04 00 00
4C 07 82 00 00 04 00 00
E2 08 82 00 00 04 00 00
B7 09 82 00 00 04 00 00
AC 0A 82 00 00 04 00 00
A8 0B 82 00 00 04 00 00
8D 0C 82 00 00 04 00 00
72 0D 82 00 00 04 00 00
0D 0E 82 00 00 04 00 00
1F 0F 80 00 00 04 00 00
ED 00 80 00 00 04 00 00
BE 01 80 00 00 04 00 00
57 12 80 00 00 04 00 00
1A 13 80 00 00 04 00 00
8A 14 80 00 00 04 00 00
61 15 80 00 00 04 00 00
48 16 80 00 00 04 00 00
29 17 80 00 00 04 00 00
87 18 80 00 00 04 00 00
D2 19 80 00 00 04 00 00
C9 1A 80 00 00 04 00 00
CD 1B 80 00 00 04 00 00
E8 1C 80 00 00 04 00 00
17 1D 80 00 00 04 00 00
68 1E 80 00 00 04 00 00
BD 1F 80 00 00 04 00 00
4F 10 80 00 00 04 00 00
1C 11 80 00 00 04 00 00
57 12 80 00 00 04 00 00
1A 13 80 00 00 04 00 00
8A 14 80 00 00 04 00 00
61 15 80 00 00 04 00 00
48 16 80 00 00 04 00 00
29 17 80 00 00 04 00 00
87 18 80 00 00 04 00 00
D2 19 80 00 00 04 00 00
C9 1A 80 00 00 04 00 00
CD 1B 80 00 00 04 00 00
E8 1C 80 00 00 04 00 00
17 1D 80 00 00 04 00 00
CA 0E 80 00 00 04 00 00
1F 0F 80 00 00 04 00 00
ED 00 80 00 00 04 00 00
BE 01 80 00 00 04 00 00
F5 02 80 00 00 04 00 00
B8 03 80 00 00 04 00 00
43 24 80 00 00 04 00 00
A8 25 80 00 00 04 00 00
81 26 80 00 00 04 00 00
E0 27 80 00 00 04 00 00
4E 28 80 00 00 04 00 00
1B 29 80 00 00 04 00 00
00 2A 80 00 00 04 00 00
04 2B 80 00 00 04 00 00
21 2C 80 00 00 04 00 00
DE 2D 80 00 00 04 00 00
A1 2E 80 00 00 04 00 00
74 2F 80 00 00 04 00 00
86 20 80 00 00 04 00 00
D5 21 80 00 00 04 00 00
9E 22 80 00 00 04 00 00
D3 23 80 00 00 04 00 00
43 24 80 00 00 04 00 00
A8 25 80 00 00 04 00 00
81 26 80 00 00 04 00 00
E0 27 80 00 00 04 00 00
4E 28 80 00 00 04 00 00
1B 29 80 00 00 04 00 00
00 2A 80 00 00 04 00 00
04 2B 80 00 00 04 00 00
21 2C 80 00 00 04 00 00
DE 2D 80 00 00 04 00 00
A1 2E 80 00 00 04 00 00
74 2F 80 00 00 04 00 00
86 20 80 00 00 04 00 00
D5 21 80 00 00 04 00 00
F5 02 80 00 00 04 00 00
B8 03 80 00 00 04 00 00
28 04 80 00 00 04 00 00
C3 05 80 00 00 04 00 00
EA 06 80 00 00 04 00 00
8B 07 80 00 00 04 00 00
F3 48 80 00 00 04 00 00
A6 49 80 00 00 04 00 00
BD 4A 80 00 00 04 00 00
B9 4B 80 00 00 04 00 00
9C 4C 80 00 00 04 00 00
63 4D 80 00 00 04 00 00
1C 4E 80 00 00 04 00 00
C9 4F 80 00 00 04 00 00
3B 40 80 00 00 04 00 00
68 41 80 00 00 04 00 00
23 42 80 00 00 04 00 00
6E 43 80 00 00 04 00 00
FE 44 80 00 00 04 00 00
15 45 80 00 00 04 00 00
3C 46 80 00 00 04 00 00
5D 47 80 00 00 04 00 00
F3 48 80 00 00 04 00 00
A6 49 80 00 00 04 00 00
BD 4A 80 00 00 04 00 00
B9 4B 80 00 00 04 00 00
9C 4C 80 00 00 04 00 00
63 4D 80 00 00 04 00 00
1C 4E 80 00 00 04 00 00
C9 4F 80 00 00 04 00 00
3B 40 80 00 00 04 00 00
68 41 80 00 00 04 00 00
23 42 80 00 00 04 00 00
6E 43 80 00 00 04 00 00
FE 44 80 00 00 04 00 00
15 45 80 00 00 04 00 00
3C 46 80 00 00 04 00 00
5D 47 80 00 00 04 00 00
F3 48 80 00 00 04 00 00
A6 49 80 00 00 04 00 00
BD 4A 80 00 00 04 00 00
6F 0B 80 00 00 04 00 00
4A 0C 80 00 00 04 00 00
B5 0D 80 00 00 04 00 00
CA 0E 80 00 00 04 00 00
1F 0F 80 00 00 04 00 00
ED 00 80 00 00 04 00 00
3D 81 80 00 00 04 00 00
76 82 80 00 00 04 00 00
3B 83 80 00 00 04 00 00
AB 84 80 00 00 04 00 00
40 85 80 00 00 04 00 00
69 86 80 00 00 04 00 00
08 87 80 00 00 04 00 00
A6 88 80 00 00 04 00 00
F3 89 80 00 00 04 00 00
E8 8A 80 00 00 04 00 00
EC 8B 80 00 00 04 00 00
C9 8C 80 00 00 04 00 00
36 8D 80 00 00 04 00 00
49 8E 80 00 00 04 00 00
9C 8F 80 00 00 04 00 00
6E 80 80 00 00 04 00 00
3D 81 80 00 00 04 00 00
76 82 80 00 00 04 00 00
3B 83 80 00 00 04 00 00
AB 84 80 00 00 04 00 00
40 85 80 00 00 04 00 00
69 86 80 00 00 04 00 00
08 87 80 00 00 04 00 00
A6 88 80 00 00 04 00 00
F3 89 80 00 00 04 00 00
E8 8A 80 00 00 04 00 00
EC 8B 80 00 00 04 00 00
C9 8C 80 00 00 04 00 00
36 8D 80 00 00 04 00 00
49 8E 80 00 00 04 00 00
9C 8F 80 00 00 04 00 00
ED 00 80 00 00 04 00 00
BE 01 80 00 00 04 00 00
F5 02 80 00 00 04 00 00
B8 03 80 00 00 04 00 00
28 04 80 00 00 04 00 00
04 05 82 00 00 04 00 00
4B 06 84 00 00 04 00 00
2A 07 84 00 00 04 00 00
84 08 84 00 00 04 00 00
D1 09 84 00 00 04 00 00
CA 0A 84 00 00 04 00 00
CE 0B 84 00 00 04 00 00
EB 0C 84 00 00 04 00 00
14 0D 84 00 00 04 00 00
6B 0E 84 00 00 04 00 00
BE 0F 84 00 00 04 00 00
4C 00 84 00 00 04 00 00
1F 01 84 00 00 04 00 00
54 02 84 00 00 04 00 00
19 03 84 00 00 04 00 00
89 04 84 00 00 04 00 00
62 05 84 00 00 04 00 00
4B 06 84 00 00 04 00 00
2A 07 84 00 00 04 00 00
84 08 84 00 00 04 00 00
D1 09 84 00 00 04 00 00
CA 0A 84 00 00 04 00 00
CE 0B 84 00 00 04 00 00
EB 0C 84 00 00 04 00 00
14 0D 84 00 00 04 00 00
6B 0E 84 00 00 04 00 00
BE 0F 84 00 00 04 00 00
4C 00 84 00 00 04 00 00
1F 01 84 00 00 04 00 00
54 02 84 00 00 04 00 00
19 03 84 00 00 04 00 00
89 04 84 00 00 04 00 00
62 05 84 00 00 04 00 00
4B 06 84 00 00 04 00 00
2A 07 84 00 00 04 00 00
48 08 88 00 00 04 00 00
1D 09 88 00 00 04 00 00
06 0A 88 00 00 04 00 00
02 0B 88 00 00 04 00 00
27 0C 88 00 00 04 00 00
D8 0D 88 00 00 04 00 00
A7 0E 88 00 00 04 00 00
72 0F 88 00 00 04 00 00
80 00 88 00 00 04 00 00
D3 01 88 00 00 04 00 00
98 02 88 00 00 04 00 00
D5 03 88 00 00 04 00 00
45 04 88 00 00 04 00 00
AE 05 88 00 00 04 00 00
87 06 88 00 00 04 00 00
E6 07 88 00 00 04 00 00
48 08 88 00 00 04 00 00
1D 09 88 00 00 04 00 00
06 0A 88 00 00 04 00 00
CE 0B 84 00 00 04 00 00
EB 0C 84 00 00 04 00 00
72 0D 82 00 00 04 00 00
0D 0E 82 00 00 04 00 00
D8 0F 82 00 00 04 00 00
ED 00 80 00 00 04 00 00
BE 01 80 00 00 04 00 00
F5 02 80 00 00 04 00 00
B8 03 80 00 00 04 00 00
28 04 80 00 00 04 00 00
C3 05 80 00 00 04 00 00
EA 06 80 00 00 04 00 00
8B 07 80 00 00 04 00 00谢谢!
回答 2
Stack Overflow用户
发布于 2018-06-03 06:37:49
如果你的目标是向汽车发送一个任意的已知代码，一个简单的方法是使用一个map来存储所有有效的第一个字节，并相应地发送它。
如果您的目标是利用以前未使用的其他位(大约5个字节)，那么不幸的是，从您提供的数据中无法使用这些位。一个原因是，即使我们知道用于生成第一个字节的算法，我们也无法知道当前未使用的~40位的顺序。
1字节值的空间很小，只有256个。对于你想发送的任何代码，你可以尝试256次，每个都有不同的第一个字节。如果有人做了什么，那很可能就是它。如果没有，那么可能代码是完全无效的？
Stack Overflow用户
发布于 2018-06-04 01:40:34
我可以说它不是什么。第一个字节不是CRC，也不是GF(2)上提供的剩余位的任何线性组合。它可以是后面的比特/字节的一些其它函数。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50643623
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