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aes
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# S-Box for SubBytes operation
S_BOX = [ 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
# SubBytes substitution table
]
# Rijndael MixColumns matrix
MIX_COLUMNS_MATRIX = [
[0x02, 0x03, 0x01, 0x01],
[0x01, 0x02, 0x03, 0x01],
[0x01, 0x01, 0x02, 0x03],
[0x03, 0x01, 0x01, 0x02]
]
# Perform SubBytes operation
def sub_bytes(state):
for i in range(4):
for j in range(4):
state[i][j] = S_BOX[state[i][j]]
return state
# Perform ShiftRows operation
def shift_rows(state):
for i in range(1, 4):
state[i] = state[i][i:] + state[i][:i]
return state
# Perform MixColumns operation
def mix_columns(state):
for col in range(4):
column = [state[row][col] for row in range(4)]
new_column = [
(MIX_COLUMNS_MATRIX[row][0] * column[0] +
MIX_COLUMNS_MATRIX[row][1] * column[1] +
MIX_COLUMNS_MATRIX[row][2] * column[2] +
MIX_COLUMNS_MATRIX[row][3] * column[3]) % 256
for row in range(4)
]
for row in range(4):
state[row][col] = new_column[row]
return state
# Perform ADDKEY operation
def add_key(state, key):
for i in range(4):
for j in range(4):
state[i][j] ^= key[i][j]
return state
# Example usage
input_matrix = [
[0xa4, 0x50, 0xba, 0x4b],
[0x89, 0xa7, 0xda, 0xe5],
[0x1a, 0x59, 0xd6, 0xe9],
[0x86, 0x9f, 0x7a, 0x9c]
]
key_matrix = [
[0x3f, 0x89, 0x4b, 0x04],
[0xab, 0x29, 0xf7, 0xae],
[0x63, 0xb2, 0x3b, 0x19],
[0x83, 0xa4, 0xc4, 0x7a]
# Key matrix
]
# SubBytes operation
sub_bytes_output = sub_bytes(input_matrix)
print("SubBytes output:")
print(sub_bytes_output)
# ShiftRows operation
shift_rows_output = shift_rows(sub_bytes_output)
print("ShiftRows output:")
print(shift_rows_output)
# MixColumns operation
mix_columns_output = mix_columns(shift_rows_output)
print("MixColumns output:")
print(mix_columns_output)
# ADDKEY operation
add_key_output = add_key(mix_columns_output, key_matrix)
print("ADDKEY output:")
print(add_key_output)