From 3475d28c0b87cc48faad2ab4948a4507daaa0fef Mon Sep 17 00:00:00 2001
From: Sun Yimin <emmansun@users.noreply.github.com>
Date: Fri, 22 Oct 2021 10:50:36 +0800
Subject: [PATCH] Updated SM4 with AESENCLAST (markdown)

---
 SM4-with-AESENCLAST.md | 52 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)

diff --git a/SM4-with-AESENCLAST.md b/SM4-with-AESENCLAST.md
index 50d7b62..a627210 100644
--- a/SM4-with-AESENCLAST.md
+++ b/SM4-with-AESENCLAST.md
@@ -18,3 +18,55 @@ Two known (M1, C1, M2, C2), please reference [sm4 with AESENCLAST](https://gist.
 {(M1, C1, M2, C2) | SM4-S(x) = A2(AES-S(A1(x)), A1(x) = M1*x + C1, A2(x) = M2*x + C2}
 ```
 
+**How to calculate M, C from lookup table?**
+
+1.The first element of the table, T[0] should be the C.
+2.Use T[1] XOR T[0], T[2] XOR T[0], T[4] XOR T[0], T[8] XOR T[0], T[16] XOR T[0], T[32] XOR T[0], T[64] XOR T[0], T[128] XOR T[0] to calculate matrix M.
+
+Below is sample
+```
+               1          2        3         4         5         6        7         8         
+
+               00000110   01110011 01110101  11100101  11100011  10010110 10010000  01010110  
+0x00,          0x06,      0x73     0x75      0xE5      0xE3      0x96     0x90      0x56      
+1 10100010
+2 01001001
+3 11111011
+4 00001001
+5 10101011
+6 01000000
+7 11100010
+8 00010010
+9 
+
+00010010
+00001001
+01001001
+10100010
+01010110
+11100101         
+01110011
+00000110
+
+               1          2        3         4         5         6        7         8         
+
+               00111100   10101001           11111010                               10110110     
+0x00           0x3c       0xa9               0xfa                                   0xb6
+1 11011100
+2 10101111
+3
+4 11011101 
+5 
+6
+7
+8 10111111
+
+10111111
+11011101
+10101111
+11011100
+10110110
+11111010
+10101001
+00111100
+```
\ No newline at end of file