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Updated SM4 with AESENCLAST (markdown)

Sun Yimin 2021-10-22 13:58:08 +08:00
parent 64114142ae
commit 3513c3d465
1 changed files with 25 additions and 0 deletions
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25
SM4-with-AESENCLAST.md

@ -72,4 +72,29 @@ Below is sample
11111010
10101001
00111100
```
```
// Generate matrix based on lookup table
func gen_matrix(lookup [256]byte) (m [8]byte) {
c := lookup[0]
m80 := lookup[0x80] ^ c
m40 := lookup[0x40] ^ c
m20 := lookup[0x20] ^ c
m10 := lookup[0x10] ^ c
m08 := lookup[0x08] ^ c
m04 := lookup[0x04] ^ c
m02 := lookup[0x02] ^ c
m01 := lookup[0x01] ^ c
m[0] = (m80 & 0x80) ^ ((m40 & 0x80) >> 1) ^ ((m20 & 0x80) >> 2) ^ ((m10 & 0x80) >> 3) ^ ((m08 & 0x80) >> 4) ^ ((m04 & 0x80) >> 5) ^ ((m02 & 0x80) >> 6) ^ ((m01 & 0x80) >> 7)
m[1] = ((m80 & 0x40) << 1) ^ (m40 & 0x40) ^ ((m20 & 0x40) >> 1) ^ ((m10 & 0x40) >> 2) ^ ((m08 & 0x40) >> 3) ^ ((m04 & 0x40) >> 4) ^ ((m02 & 0x40) >> 5) ^ ((m01 & 0x40) >> 6)
m[2] = ((m80 & 0x20) << 2) ^ ((m40 & 0x20) << 1) ^ (m20 & 0x20) ^ ((m10 & 0x20) >> 1) ^ ((m08 & 0x20) >> 2) ^ ((m04 & 0x20) >> 3) ^ ((m02 & 0x20) >> 4) ^ ((m01 & 0x20) >> 5)
m[3] = ((m80 & 0x10) << 3) ^ ((m40 & 0x10) << 2) ^ ((m20 & 0x10) << 1) ^ (m10 & 0x10) ^ ((m08 & 0x10) >> 1) ^ ((m04 & 0x10) >> 2) ^ ((m02 & 0x10) >> 3) ^ ((m01 & 0x10) >> 4)
m[4] = ((m80 & 0x08) << 4) ^ ((m40 & 0x08) << 3) ^ ((m20 & 0x08) << 2) ^ ((m10 & 0x08) << 1) ^ (m08 & 0x08) ^ ((m04 & 0x08) >> 1) ^ ((m02 & 0x08) >> 2) ^ ((m01 & 0x08) >> 3)
m[5] = ((m80 & 0x04) << 5) ^ ((m40 & 0x04) << 4) ^ ((m20 & 0x04) << 3) ^ ((m10 & 0x04) << 2) ^ ((m08 & 0x04) << 1) ^ (m04 & 0x04) ^ ((m02 & 0x04) >> 1) ^ ((m01 & 0x04) >> 2)
m[6] = ((m80 & 0x02) << 6) ^ ((m40 & 0x02) << 5) ^ ((m20 & 0x02) << 4) ^ ((m10 & 0x02) << 3) ^ ((m08 & 0x02) << 2) ^ ((m04 & 0x02) << 1) ^ (m02 & 0x02) ^ ((m01 & 0x02) >> 1)
m[7] = ((m80 & 0x01) << 7) ^ ((m40 & 0x01) << 6) ^ ((m20 & 0x01) << 5) ^ ((m10 & 0x01) << 4) ^ ((m08 & 0x01) << 2) ^ ((m04 & 0x01) << 2) ^ ((m02 & 0x01) << 1) ^ (m01 & 0x01)
return
}
```