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Updated SM4 with AESENCLAST (markdown)

Sun Yimin 2021-11-03 11:14:06 +08:00
parent 6c97ff23b5
commit a7e0f772d7
1 changed files with 21 additions and 0 deletions
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21
SM4-with-AESENCLAST.md

@ -229,7 +229,28 @@ func gen_matrix(lookup [256]byte) (m [8]byte) {
return
}
```
Similar python code:
```
from pyfinite import genericmatrix
def XOR(x, y): return x ^ y
def AND(x, y): return x & y
def DIV(x, y): return x
def matrix_from_cols(cols):
m = genericmatrix.GenericMatrix(size=(8, 8), zeroElement=0, identityElement=1, add=XOR, mul=AND, sub=XOR, div=DIV)
for i in range (8):
k = 7 - i
j = 1 << k
m.SetRow(i, [(cols[0] & j) >> k, (cols[1] & j) >> k, (cols[2] & j) >> k, (cols[3] & j) >> k, (cols[4] & j) >> k, (cols[5] & j) >> k, (cols[6] & j) >> k, (cols[7] & j) >> k])
return m
def gen_matrix_based_table(table):
return matrix_from_cols([table[0x80] ^ table[0], table[0x40] ^ table[0], table[0x20] ^ table[0], table[0x10] ^ table[0], table[0x08] ^ table[0], table[0x04] ^ table[0], table[0x02] ^ table[0], table[0x01] ^ table[0]])
```
# Reference
* [AES-NI used in SM4](https://github.com/mjosaarinen/sm4ni)
* [Advanced Encryption Standard (AES)](https://www.nist.gov/publications/advanced-encryption-standard-aes)