Function encrypt

Python/des.py:200–244

(pt, rkb, rk)

def encrypt(pt, rkb, rk):
	pt = hex2bin(pt)

	# Initial Permutation
	pt = permute(pt, initial_perm, 64)
	print("After initial permutation", bin2hex(pt))

	# Splitting
	left = pt[0:32]
	right = pt[32:64]
	for i in range(0, 16):
		# Expansion D-box: Expanding the 32 bits data into 48 bits
		right_expanded = permute(right, exp_d, 48)

		# XOR RoundKey[i] and right_expanded
		xor_x = xor(right_expanded, rkb[i])

		# S-boxex: substituting the value from s-box table by calculating row and column
		sbox_str = ""
		for j in range(0, 8):
			row = bin2dec(int(xor_x[j * 6] + xor_x[j * 6 + 5]))
			col = bin2dec(
				int(xor_x[j * 6 + 1] + xor_x[j * 6 + 2] + xor_x[j * 6 + 3] + xor_x[j * 6 + 4]))
			val = sbox[j][row][col]
			sbox_str = sbox_str + dec2bin(val)

		# Straight D-box: After substituting rearranging the bits
		sbox_str = permute(sbox_str, per, 32)

		# XOR left and sbox_str
		result = xor(left, sbox_str)
		left = result

		# Swapper
		if(i != 15):
			left, right = right, left
		print("Round ", i + 1, " ", bin2hex(left),
			" ", bin2hex(right), " ", rk[i])

	# Combination
	combine = left + right

	# Final permutation: final rearranging of bits to get cipher text
	cipher_text = permute(combine, final_perm, 64)
	return cipher_text


pt = "123456ABCD132536"