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aes.py
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aes.py
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import copy
# Taille mot: 32 bits
Nw=32
# Taille clé : 4 mots
Nk = 4
# Taille bloc : 4 mots
Nb = 4
# Nombre de tours : 10
Nr = 10
entree = [0x32, 0x43, 0xf6, 0xa8, 0x88, 0x5a, 0x30, 0x8d, 0x31, 0x31, 0x98, 0xa2, 0xe0, 0x37, 0x07, 0x34]
def sortie(e):
# out[r+4c]=s[r,c] pour 0<=r<=4 et 0<=c<=Nb
out=[None]*4*Nb
for r in range(0,4):
for c in range(0,Nb):
out[r+4*c]=e[r][c]
return out
import numpy as np
np.set_printoptions(formatter={'int':hex})
def creer_bloc_etat(c_in):
c_o = []
for c in range(0,Nb):
col=[]
for r in range(0,4):
col.append(c_in[c*Nb+r])
c_o.append(col)
return np.matrix(c_o)
def ajouter_cle_de_tour(etat,cle):
return np.bitwise_xor(etat,cle)
Sbox = [
0x63, 0x7C, 0x77, 0x7B, 0xF2, 0x6B, 0x6F, 0xC5, 0x30, 0x01, 0x67, 0x2B, 0xFE, 0xD7, 0xAB, 0x76,
0xCA, 0x82, 0xC9, 0x7D, 0xFA, 0x59, 0x47, 0xF0, 0xAD, 0xD4, 0xA2, 0xAF, 0x9C, 0xA4, 0x72, 0xC0,
0xB7, 0xFD, 0x93, 0x26, 0x36, 0x3F, 0xF7, 0xCC, 0x34, 0xA5, 0xE5, 0xF1, 0x71, 0xD8, 0x31, 0x15,
0x04, 0xC7, 0x23, 0xC3, 0x18, 0x96, 0x05, 0x9A, 0x07, 0x12, 0x80, 0xE2, 0xEB, 0x27, 0xB2, 0x75,
0x09, 0x83, 0x2C, 0x1A, 0x1B, 0x6E, 0x5A, 0xA0, 0x52, 0x3B, 0xD6, 0xB3, 0x29, 0xE3, 0x2F, 0x84,
0x53, 0xD1, 0x00, 0xED, 0x20, 0xFC, 0xB1, 0x5B, 0x6A, 0xCB, 0xBE, 0x39, 0x4A, 0x4C, 0x58, 0xCF,
0xD0, 0xEF, 0xAA, 0xFB, 0x43, 0x4D, 0x33, 0x85, 0x45, 0xF9, 0x02, 0x7F, 0x50, 0x3C, 0x9F, 0xA8,
0x51, 0xA3, 0x40, 0x8F, 0x92, 0x9D, 0x38, 0xF5, 0xBC, 0xB6, 0xDA, 0x21, 0x10, 0xFF, 0xF3, 0xD2,
0xCD, 0x0C, 0x13, 0xEC, 0x5F, 0x97, 0x44, 0x17, 0xC4, 0xA7, 0x7E, 0x3D, 0x64, 0x5D, 0x19, 0x73,
0x60, 0x81, 0x4F, 0xDC, 0x22, 0x2A, 0x90, 0x88, 0x46, 0xEE, 0xB8, 0x14, 0xDE, 0x5E, 0x0B, 0xDB,
0xE0, 0x32, 0x3A, 0x0A, 0x49, 0x06, 0x24, 0x5C, 0xC2, 0xD3, 0xAC, 0x62, 0x91, 0x95, 0xE4, 0x79,
0xE7, 0xC8, 0x37, 0x6D, 0x8D, 0xD5, 0x4E, 0xA9, 0x6C, 0x56, 0xF4, 0xEA, 0x65, 0x7A, 0xAE, 0x08,
0xBA, 0x78, 0x25, 0x2E, 0x1C, 0xA6, 0xB4, 0xC6, 0xE8, 0xDD, 0x74, 0x1F, 0x4B, 0xBD, 0x8B, 0x8A,
0x70, 0x3E, 0xB5, 0x66, 0x48, 0x03, 0xF6, 0x0E, 0x61, 0x35, 0x57, 0xB9, 0x86, 0xC1, 0x1D, 0x9E,
0xE1, 0xF8, 0x98, 0x11, 0x69, 0xD9, 0x8E, 0x94, 0x9B, 0x1E, 0x87, 0xE9, 0xCE, 0x55, 0x28, 0xDF,
0x8C, 0xA1, 0x89, 0x0D, 0xBF, 0xE6, 0x42, 0x68, 0x41, 0x99, 0x2D, 0x0F, 0xB0, 0x54, 0xBB, 0x16
]
def Sbox_inverse(val):
return Sbox.index(val)
def substituer_octet(i):
return Sbox[int(i)]
substituer_octet = np.vectorize(substituer_octet)
def decaler_lignes(etat):
new_etat=[]
for r in range(0,4):
col=[]
for c in range(0,Nb):
o=etat.A[(c+r)%Nb][r]
col.append(o)
new_etat.append(col)
return np.transpose(np.matrix(new_etat))
def galois_mult(a, b):
p = 0
hi_bit_set = 0
for i in range(8):
if b & 1 == 1: p ^= a
hi_bit_set = a & 0x80
a <<= 1
if hi_bit_set == 0x80: a ^= 0x1b
b >>= 1
return p % 256
def melanger_colonnes(e):
new_etat = []
for col in e.A:
new_col = []
new_col.append(galois_mult(col[0],2)^galois_mult(col[1],3)^\
galois_mult(col[2],1)^galois_mult(col[3],1))
new_col.append(galois_mult(col[0],1)^galois_mult(col[1],2)^\
galois_mult(col[2],3)^galois_mult(col[3],1))
new_col.append(galois_mult(col[0],1)^galois_mult(col[1],1)^\
galois_mult(col[2],2)^galois_mult(col[3],3))
new_col.append(galois_mult(col[0],3)^galois_mult(col[1],1)^\
galois_mult(col[2],1)^galois_mult(col[3],2))
new_etat.append(new_col)
return np.matrix(new_etat)
Rcon = [
0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a,
0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39,
0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a,
0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8,
0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef,
0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc,
0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b,
0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3,
0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94,
0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20,
0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35,
0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5,
0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f,
0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04,
0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63,
0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd,
0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb]
def RotWord(mot):
return np.roll(mot, -1)
def expansion_cle(cle):
cle_mots = np.matrix([cle[4 * i:4 * i + 4] for i in range(0, Nk)]+[[0]*4]*4*Nr)
w = np.matrix(copy.copy(cle_mots.A.tolist() ))#+ [None] * Nr))
# print(cle_mots)
temp = cle_mots.A[Nk - 1]
for i in range(4, (Nr+1)*4):
# print("******* i = {} *******".format(i))
# print("temp : ", temp)
if i%4 == 0:
temp = RotWord(temp)
# print("After RotWord : ", temp)
temp = substituer_octet(temp)
# print("After SubWord : ", temp)
# print("Rcon[i/Nk] : ", bin(Rcon[i // Nk]))
temp[0] = temp[0] ^ Rcon[i // Nk]
# print("After XOR with Rcon : ", temp)
# print("w[i–Nk] : ", w.A[i - Nk])
w.A[i] = temp ^ w.A[i - Nk]
# print("w[i] = temp^w[i-Nk] : ", w.A[i])
temp = w.A[i]
return w
def gen_sous_cles(cle, Nr):
w = expansion_cle(cle)
return [w[i * Nk:(i + 1) * Nk] for i in range(0,Nr+1)]
def aes_128(entree, cle):
w = expansion_cle(cle)
sous_cles = [w[i * Nk:(i + 1) * Nk] for i in range(0, Nr + 1)]
# Tour d'initialisation
e = creer_bloc_etat(entree)
# cle_exp = w[0:Nk]
e = ajouter_cle_de_tour(e, sous_cles[0])
# Tours
for i in range(1, Nr):
e = substituer_octet(e)
e = decaler_lignes(e)
e = melanger_colonnes(e)
# cle_exp = w[i * Nk:(i + 1) * Nk]
e = ajouter_cle_de_tour(e, sous_cles[i])
# Tour final
e = substituer_octet(e)
e = decaler_lignes(e)
e = ajouter_cle_de_tour(e, sous_cles[Nr])
e = np.reshape(e, 16)
return list(e.A[0])