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Copy pathAES_Key_Expansion.py
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AES_Key_Expansion.py
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import numpy as np
# Rijndael S-box
sbox = np.array( [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] )
rcon = [0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36]
#Key
key=np.array(['0x83','0x52', '0xed', '0x2f','0x83' ,'0x20', '0x83', '0x83','0x52' ,'0x04', '0xed', '0xb7','0x04' ,'0x20', '0x83', '0x83'])
key=np.transpose(key.reshape(4,4))
#For 10 Round keys
for r in range(1,11):
#Taking last column of the key and move the top byte to bottom
print("Output after taking last column of the key and moving the top byte to bottom for round",r)
x=np.roll(key[3],-1)
print(x)
print('\n')
sbox=(sbox.reshape(16,16))
round_const=r
#Now passing through Sbox
for i in range(4):
x[i]=x[i].replace('0x','')
x0=int((x[i])[0],16)
x1=int((x[i])[1],16)
x[i]=(sbox[x0][x1])
print("Output after passing the values through Sbox for round",r)
print(x)
print('\n')
for i in range(4):
for j in range(4):
key[i][j]=key[i][j].replace('0x','')
key[i][j]=int((key[i][j]),16)
#Taking xor with Round constant
#Only xoring the first bit of last column, since all other bits of round keys are 0
print("Output after taking xor with Round Constant for round",r)
x[0]=(int(x[0]))^(rcon[round_const])
print(x)
print('\n')
New_round_key=np.empty([4,4],dtype=int)
for j in range(4):
New_round_key[0][j]=(int(key[0][j])^int(x[j]))
for i in range(1,4):
for j in range(4):
New_round_key[i][j]=(int(key[i][j])^int(New_round_key[i-1][j]))
print("Round Key for round",r)
#Uncomment below line to print int values of round keys
#print(np.transpose(New_round_key))
#Converting Values to Hexadecimal
New_round_key_hex=[]
for i in range(4):
for j in range(4):
New_round_key_hex.append(hex(New_round_key[i][j]))
for i in range(16):
if((len(New_round_key_hex[i]))==3):
New_round_key_hex[i]=New_round_key_hex[i][0]+New_round_key_hex[i][1]+New_round_key_hex[i][0]+New_round_key_hex[i][2]
New_round_key_hex=np.array(New_round_key_hex)
New_round_key_hex=New_round_key_hex.reshape(4,4)
print(np.transpose(New_round_key_hex))
key=New_round_key_hex
print("\n")