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# Python PRIDE implementation
# Version: 1.0
# Date: 22/04/2015
#
# =============================================================================
# Copyright (c) 2015 Camil Staps (info@camilstaps.nl)
# =============================================================================
class Pride:
def __init__(self,key):
"""Create a PRIDE cipher object
key: the key as a 128-bit rawstring
"""
if len(key) * 8 == 128:
self.key_whitening = string2number(key[:8])
self.key_1 = key[8:]
#self.roundkeys = generateRoundkeys(key[8:])
else:
raise ValueError, "Key must be a 128-bit rawstring"
# print self.key_whitening
#print self.roundkeys
def encrypt(self,block):
"""Encrypt 1 block (8 bytes)
Input: plaintext block as raw string
Output: ciphertext block as raw string
"""
state = string2number(block)
state = pLayer_dec(state)
state = addRoundKey(state, self.key_whitening)
for i in xrange (1,20):
state = addRoundKey(state, pLayer_dec(roundKey(self.key_1, i)))
state = sBoxLayer(state)
state = lLayer(state)
state = addRoundKey(state, pLayer_dec(roundKey(self.key_1, 20)))
state = sBoxLayer(state)
state = addRoundKey(state, self.key_whitening)
state = pLayer(state)
return number2string_N(state,8)
# 0 1 2 3 4 5 6 7 8 9 a b c d e f
Sbox= [0x0,0x4,0x8,0xf,0x1,0x5,0xe,0x9,0x2,0x7,0xa,0xc,0xb,0xd,0x6,0x3]
Sbox_inv = [Sbox.index(x) for x in xrange(16)]
PBox = [0,16,32,48,1,17,33,49,2,18,34,50,3,19,35,51,4,20,36,52,5,21,37,53,6,22,38,54,7,23,39,55,8,24,40,56,9,25,41,57,10,26,42,58,11,27,43,59,12,28,44,60,13,29,45,61,14,30,46,62,15,31,47,63]
PBox_inv = [PBox.index(x) for x in xrange(64)]
L0 = [[0,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0],
[0,0,0,0,0,1,0,0,0,1,0,0,0,1,0,0],
[0,0,0,0,0,0,1,0,0,0,1,0,0,0,1,0],
[0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,1],
[1,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0],
[0,1,0,0,0,0,0,0,0,1,0,0,0,1,0,0],
[0,0,1,0,0,0,0,0,0,0,1,0,0,0,1,0],
[0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,1],
[1,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0],
[0,1,0,0,0,1,0,0,0,0,0,0,0,1,0,0],
[0,0,1,0,0,0,1,0,0,0,0,0,0,0,1,0],
[0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,1],
[1,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0],
[0,1,0,0,0,1,0,0,0,1,0,0,0,0,0,0],
[0,0,1,0,0,0,1,0,0,0,1,0,0,0,0,0],
[0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,0]]
L1 = [[1,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0],
[0,1,1,0,0,0,0,0,0,0,0,0,1,0,0,0],
[0,0,1,1,0,0,0,0,0,0,0,0,0,1,0,0],
[0,0,0,1,1,0,0,0,0,0,0,0,0,0,1,0],
[0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,1],
[0,0,0,0,0,1,1,0,1,0,0,0,0,0,0,0],
[0,0,0,0,0,0,1,1,0,1,0,0,0,0,0,0],
[1,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0],
[1,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0],
[0,1,0,0,0,0,0,0,0,0,0,0,1,1,0,0],
[0,0,1,0,0,0,0,0,0,0,0,0,0,1,1,0],
[0,0,0,1,0,0,0,0,0,0,0,0,0,0,1,1],
[0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,1],
[0,0,0,0,0,1,0,0,1,1,0,0,0,0,0,0],
[0,0,0,0,0,0,1,0,0,1,1,0,0,0,0,0],
[0,0,0,0,0,0,0,1,0,0,1,1,0,0,0,0]]
L2 = [[0,0,0,0,1,1,0,0,0,0,0,0,0,0,0,1],
[0,0,0,0,0,1,1,0,1,0,0,0,0,0,0,0],
[0,0,0,0,0,0,1,1,0,1,0,0,0,0,0,0],
[1,0,0,0,0,0,0,1,0,0,1,0,0,0,0,0],
[1,1,0,0,0,0,0,0,0,0,0,1,0,0,0,0],
[0,1,1,0,0,0,0,0,0,0,0,0,1,0,0,0],
[0,0,1,1,0,0,0,0,0,0,0,0,0,1,0,0],
[0,0,0,1,1,0,0,0,0,0,0,0,0,0,1,0],
[0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,1],
[0,0,0,0,0,1,0,0,1,1,0,0,0,0,0,0],
[0,0,0,0,0,0,1,0,0,1,1,0,0,0,0,0],
[0,0,0,0,0,0,0,1,0,0,1,1,0,0,0,0],
[1,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0],
[0,1,0,0,0,0,0,0,0,0,0,0,1,1,0,0],
[0,0,1,0,0,0,0,0,0,0,0,0,0,1,1,0],
[0,0,0,1,0,0,0,0,0,0,0,0,0,0,1,1]]
L3 = [[1,0,0,0,1,0,0,0,0,0,0,0,1,0,0,0],
[0,1,0,0,0,1,0,0,0,0,0,0,0,1,0,0],
[0,0,1,0,0,0,1,0,0,0,0,0,0,0,1,0],
[0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,1],
[1,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0],
[0,1,0,0,0,1,0,0,0,1,0,0,0,0,0,0],
[0,0,1,0,0,0,1,0,0,0,1,0,0,0,0,0],
[0,0,0,1,0,0,0,1,0,0,0,1,0,0,0,0],
[0,0,0,0,1,0,0,0,1,0,0,0,1,0,0,0],
[0,0,0,0,0,1,0,0,0,1,0,0,0,1,0,0],
[0,0,0,0,0,0,1,0,0,0,1,0,0,0,1,0],
[0,0,0,0,0,0,0,1,0,0,0,1,0,0,0,1],
[1,0,0,0,0,0,0,0,1,0,0,0,1,0,0,0],
[0,1,0,0,0,0,0,0,0,1,0,0,0,1,0,0],
[0,0,1,0,0,0,0,0,0,0,1,0,0,0,1,0],
[0,0,0,1,0,0,0,0,0,0,0,1,0,0,0,1]]
L0_inv = L0
L1_inv = [[0,0,0,0,0,0,1,1,0,0,0,0,0,0,1,0],
[1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1],
[1,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0],
[0,1,1,0,0,0,0,0,0,1,0,0,0,0,0,0],
[0,0,1,1,0,0,0,0,0,0,1,0,0,0,0,0],
[0,0,0,1,1,0,0,0,0,0,0,1,0,0,0,0],
[0,0,0,0,1,1,0,0,0,0,0,0,1,0,0,0],
[0,0,0,0,0,1,1,0,0,0,0,0,0,1,0,0],
[0,0,0,1,0,0,0,0,0,0,0,1,1,0,0,0],
[0,0,0,0,1,0,0,0,0,0,0,0,1,1,0,0],
[0,0,0,0,0,1,0,0,0,0,0,0,0,1,1,0],
[0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,1],
[0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0],
[0,1,0,0,0,0,0,0,0,1,1,0,0,0,0,0],
[0,0,1,0,0,0,0,0,0,0,1,1,0,0,0,0]]
L2_inv = [[0,0,1,1,0,0,0,0,0,0,1,0,0,0,0,0],
[0,0,0,1,1,0,0,0,0,0,0,1,0,0,0,0],
[0,0,0,0,1,1,0,0,0,0,0,0,1,0,0,0],
[0,0,0,0,0,1,1,0,0,0,0,0,0,1,0,0],
[0,0,0,0,0,0,1,1,0,0,0,0,0,0,1,0],
[1,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1],
[1,1,0,0,0,0,0,0,1,0,0,0,0,0,0,0],
[0,1,1,0,0,0,0,0,0,1,0,0,0,0,0,0],
[0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,1],
[1,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0],
[0,1,0,0,0,0,0,0,0,1,1,0,0,0,0,0],
[0,0,1,0,0,0,0,0,0,0,1,1,0,0,0,0],
[0,0,0,1,0,0,0,0,0,0,0,1,1,0,0,0],
[0,0,0,0,1,0,0,0,0,0,0,0,1,1,0,0],
[0,0,0,0,0,1,0,0,0,0,0,0,0,1,1,0],
[0,0,0,0,0,0,1,0,0,0,0,0,0,0,1,1]]
L3_inv = L3
def matrixMultiply(matrix, input):
r_outs = []
for r in matrix:
r_out = 0;
for c_i, c in reversed(list(enumerate(r))):
r_out ^= c * ((input >> (15 - c_i)) & 0x1)
r_outs.append(r_out)
return sum([(1 << (15-i)) * v for i,v in enumerate(r_outs)])
def roundKey(key, i):
return string2number(key[0] + chr((ord(key[1]) + 193 * i) % 256) + key[2] + chr((ord(key[3]) + 165 * i) % 256) + key[4] + chr((ord(key[5]) + 81 * i) % 256) + key[6] + chr((ord(key[7]) + 197 * i) % 256))
def addRoundKey(state,roundkey):
return state ^ roundkey
def sBoxLayer(state):
"""SBox function for encryption
Input: 64-bit integer
Output: 64-bit integer"""
output = 0
for i in xrange(16):
output += Sbox[( state >> (i*4)) & 0xF] << (i*4)
return output
def sBoxLayer_dec(state):
"""Inverse SBox function for decryption
Input: 64-bit integer
Output: 64-bit integer"""
output = 0
for i in xrange(16):
output += Sbox_inv[( state >> (i*4)) & 0xF] << (i*4)
return output
def pLayer(state):
"""Permutation layer for encryption
Input: 64-bit integer
Output: 64-bit integer"""
return sum ([((state >> i) & 0x01) << PBox[i] for i in xrange(64)])
def pLayer_dec(state):
"""Permutation layer for decryption
Input: 64-bit integer
Output: 64-bit integer"""
return sum ([((state >> i) & 0x01) << PBox_inv[i] for i in xrange(64)])
def lLayer(state):
state = pLayer(state)
state = (matrixMultiply(L0, (state >> 48) & 0xffff) << 48) + (matrixMultiply(L1, (state >> 32) & 0xffff) << 32) + (matrixMultiply(L2, (state >> 16) & 0xffff) << 16) + matrixMultiply(L3, state & 0xffff)
state = pLayer_dec(state)
return state
def string2number(i):
""" Convert a string to a number
Input: string (big-endian)
Output: long or integer
"""
return int(i.encode('hex'),16)
def number2string_N(i, N):
"""Convert a number to a string of fixed size
i: long or integer
N: length of string
Output: string (big-endian)
"""
s = '%0*x' % (N*2, i)
return s.decode('hex')
def _test():
import doctest
doctest.testmod()
if __name__ == "__main__":
print Pride("0000000000000000fedcba9876543210".decode('hex')).encrypt("0123456789abcdef".decode('hex')).encode('hex')
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