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Updated SM4 with AESENCLAST (markdown)

Sun Yimin 2022-07-22 16:51:38 +08:00
parent dcc2985f40
commit 96d3ad4563
1 changed files with 6 additions and 6 deletions
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12
SM4-with-AESENCLAST.md

@ -25,7 +25,7 @@ sm4_box_aesenclast <-> sm4_box_aesbox_1 <-> sm4_box_aesbox_2 <-> sm4_box_aesbox_
**We note that each affine transform can be constructed from XOR of two 4x8-bit table lookups, which we implement with constant time byte shuffle instructions (each 16-entry table is in a single 128-bit register).**
```
```golang
sm4_box_aesenclast
y := mm_and_si128(x, const_0f)
y = mm_shuffle_epi8(a1l, y)
@ -91,8 +91,8 @@ sm4_box_aesbox_4
}
```
**How to calculate lookup table from M, C?**
```
{Mi+C | i>=0 && i<256}
```golang
// {Mi+C | i>=0 && i<256}
// Generate lookup table based on M matrix and C
func gen_lookup_table(m [8]byte, c byte) {
@ -113,7 +113,7 @@ func gen_lookup_table(m [8]byte, c byte) {
}
```
Below python code is more intuitive:
```
```python
from pyfinite import genericmatrix
XOR = lambda x,y:x^y
@ -203,7 +203,7 @@ Below is sample
00111100
```
```
```golang
// Generate matrix based on lookup table
func gen_matrix(lookup [256]byte) (m [8]byte) {
c := lookup[0]
@ -228,7 +228,7 @@ func gen_matrix(lookup [256]byte) (m [8]byte) {
}
```
Similar python code:
```
```python
from pyfinite import genericmatrix