diff --git a/py3-kms/aes.py b/py3-kms/aes.py
deleted file mode 100644
index ad4c2d6..0000000
--- a/py3-kms/aes.py
+++ /dev/null
@@ -1,740 +0,0 @@
-#!/usr/bin/env python3
-
-# aes.py: implements AES - Advanced Encryption Standard
-# from the SlowAES project, http://code.google.com/p/slowaes/
-#
-# Copyright (c) 2008 Josh Davis ( http://www.josh-davis.org )
-# Alex Martelli ( http://www.aleax.it )
-#
-# Ported from C code written by Laurent Haan ( http://www.progressive-coding.com )
-
-# Licensed under the Apache License, Version 2.0
-# http://www.apache.org/licenses/
-#
-
-"""
-Modified for py-kms;
-Ported to Python3 with minimal changements.
-"""
-
-import os
-import math
-
-
-def append_PKCS7_padding(val):
- """ Function to pad the given data to a multiple of 16-bytes by PKCS7 padding. """
-
- numpads = 16 - (len(val) % 16)
- return val + numpads * bytes(chr(numpads), 'utf-8')
-
-def strip_PKCS7_padding(val):
- """ Function to strip off PKCS7 padding. """
-
- if len(val) % 16 or not val:
- raise ValueError("String of len %d can't be PCKS7-padded" % len(val))
- numpads = val[-1]
- if numpads > 16:
- raise ValueError("String ending with %r can't be PCKS7-padded" % val[-1])
- return val[:-numpads]
-
-
-class AES( object ):
- """ Class implementing the Advanced Encryption Standard algorithm. """
-
- #*py-kms*
- v6 = False
-
- # Valid key sizes
- KeySize = {
- "SIZE_128": 16,
- "SIZE_192": 24,
- "SIZE_256": 32
- }
-
- # Rijndael S-box
- 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 ]
-
- # Rijndael Inverted S-box
- rsbox = [ 0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3,
- 0x9e, 0x81, 0xf3, 0xd7, 0xfb, 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f,
- 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, 0x54,
- 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b,
- 0x42, 0xfa, 0xc3, 0x4e, 0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24,
- 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25, 0x72, 0xf8,
- 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d,
- 0x65, 0xb6, 0x92, 0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda,
- 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84, 0x90, 0xd8, 0xab,
- 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3,
- 0x45, 0x06, 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1,
- 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, 0x3a, 0x91, 0x11, 0x41,
- 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6,
- 0x73, 0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9,
- 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e, 0x47, 0xf1, 0x1a, 0x71, 0x1d,
- 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
- 0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0,
- 0xfe, 0x78, 0xcd, 0x5a, 0xf4, 0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07,
- 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f, 0x60,
- 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f,
- 0x93, 0xc9, 0x9c, 0xef, 0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5,
- 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61, 0x17, 0x2b,
- 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55,
- 0x21, 0x0c, 0x7d ]
-
- # Rijndael Rcon
- 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 getSBoxValue(self,num):
- """ Method to retrieve a given S-Box value. """
- return self.sbox[num]
-
- def getSBoxInvert(self,num):
- """ Method to retrieve a given Inverted S-Box value."""
- return self.rsbox[num]
-
- def rotate(self, word):
- """ Method performing Rijndael's key schedule rotate operation.
- Rotate a word eight bits to the left: eg, rotate(1d2c3a4f) == 2c3a4f1d
- @param word: char list of size 4 (32 bits overall).
- """
- return word[1:] + word[:1]
-
- def getRconValue(self, num):
- """ Method to retrieve a given Rcon value. """
- return self.Rcon[num]
-
- def core(self, word, iteration):
- """ Method performing the key schedule core operation. """
- # Rotate the 32-bit word 8 bits to the left.
- word = self.rotate(word)
- # Apply S-Box substitution on all 4 parts of the 32-bit word.
- for i in range(4):
- word[i] = self.getSBoxValue(word[i])
- # XOR the output of the rcon operation with i to the first part (leftmost) only.
- word[0] = word[0] ^ self.getRconValue(iteration)
- return word
-
- def expandKey(self, key, size, expandedKeySize):
- """ Method performing Rijndael's key expansion.
- Expands an 128, 192, 256 key into an 176, 208, 240 bytes key.
- """
- # Current expanded keySize, in bytes.
- currentSize = 0
- rconIteration = 1
- expandedKey = [0] * expandedKeySize
-
- # Set the 16, 24, 32 bytes of the expanded key to the input key.
- for j in range(size):
- expandedKey[j] = key[j]
- currentSize += size
-
- while currentSize < expandedKeySize:
- # Assign the previous 4 bytes to the temporary value t.
- t = expandedKey[currentSize - 4:currentSize]
-
- # Every 16,24,32 bytes we apply the core schedule to t
- # and increment rconIteration afterwards.
- if currentSize % size == 0:
- t = self.core(t, rconIteration)
- rconIteration += 1
- # For 256-bit keys, we add an extra sbox to the calculation.
- if size == self.KeySize["SIZE_256"] and ((currentSize % size) == 16):
- for l in range(4):
- t[l] = self.getSBoxValue(t[l])
-
- # We XOR t with the four-byte block 16,24,32 bytes before the new
- # expanded key. This becomes the next four bytes in the expanded key.
- for m in range(4):
- expandedKey[currentSize] = expandedKey[currentSize - size] ^ t[m]
- currentSize += 1
- return expandedKey
-
- def addRoundKey(self, state, roundKey):
- """ Method to add (XORs) the round key to the state. """
- for i in range(16):
- state[i] ^= roundKey[i]
- return state
-
- def createRoundKey(self, expandedKey, roundKeyPointer):
- """ Creates a round key from the given expanded key and the
- position within the expanded key.
- """
- roundKey = [0] * 16
- for i in range(4):
- for j in range(4):
- roundKey[j * 4 + i] = expandedKey[roundKeyPointer + i * 4 + j]
- return roundKey
-
- def galois_multiplication(self, a, b):
- """ Method to perform a Galois multiplication of 8 bit characters
- a and b.
- """
- p = 0
- for counter in range(8):
- if b & 1:
- p ^= a
- hi_bit_set = a & 0x80
- a <<= 1
- # keep a 8 bit
- a &= 0xFF
- if hi_bit_set:
- a ^= 0x1b
- b >>= 1
- return p
-
- def subBytes(self, state, isInv):
- """ Method to substitute all the values from the state with the
- value in the SBox using the state value as index for the SBox.
- """
- if isInv:
- getter = self.getSBoxInvert
- else:
- getter = self.getSBoxValue
- for i in range(16):
- state[i] = getter(state[i])
- return state
-
- def shiftRows(self, state, isInv):
- """ Method to iterate over the 4 rows and call shiftRow(...) with that row. """
- for i in range(4):
- state = self.shiftRow(state, i * 4, i, isInv)
- return state
-
- def shiftRow(self, state, statePointer, nbr, isInv):
- """ Method to shift the row to the left. """
- for i in range(nbr):
- if isInv:
- state[statePointer:statePointer + 4] = state[statePointer + 3:statePointer + 4] + \
- state[statePointer:statePointer + 3]
- else:
- state[statePointer:statePointer + 4] = state[statePointer + 1:statePointer + 4] + \
- state[statePointer:statePointer + 1]
- return state
-
-
- def mixColumns(self, state, isInv):
- """ Method to perform a galois multiplication of the 4x4 matrix. """
- # Iterate over the 4 columns.
- for i in range(4):
- # Construct one column by slicing over the 4 rows.
- column = state[i:i + 16:4]
- # Apply the mixColumn on one column.
- column = self.mixColumn(column, isInv)
- # Put the values back into the state.
- state[i:i + 16:4] = column
- return state
-
- def mixColumn(self, column, isInv):
- """ Method to perform a galois multiplication of 1 column the 4x4 matrix. """
- if isInv:
- mult = [14, 9, 13, 11]
- else:
- mult = [2, 1, 1, 3]
- cpy = list(column)
- g = self.galois_multiplication
-
- column[0] = g(cpy[0], mult[0]) ^ g(cpy[3], mult[1]) ^ \
- g(cpy[2], mult[2]) ^ g(cpy[1], mult[3])
- column[1] = g(cpy[1], mult[0]) ^ g(cpy[0], mult[1]) ^ \
- g(cpy[3], mult[2]) ^ g(cpy[2], mult[3])
- column[2] = g(cpy[2], mult[0]) ^ g(cpy[1], mult[1]) ^ \
- g(cpy[0], mult[2]) ^ g(cpy[3], mult[3])
- column[3] = g(cpy[3], mult[0]) ^ g(cpy[2], mult[1]) ^ \
- g(cpy[1], mult[2]) ^ g(cpy[0], mult[3])
- return column
-
-
- def aes_round(self, state, roundKey, roundKms):
- """ Method to apply the 4 operations of the forward round in sequence. """
- state = self.subBytes(state, False)
- state = self.shiftRows(state, False)
- state = self.mixColumns(state, False)
-
- #*py-kms*
- if self.v6:
- if roundKms == 4:
- state[0] ^= 0x73
- if roundKms == 6:
- state[0] ^= 0x09
- if roundKms == 8:
- state[0] ^= 0xE4
-
- state = self.addRoundKey(state, roundKey)
- return state
-
- def aes_invRound(self, state, roundKey, roundKms):
- """ Method to apply the 4 operations of the inverse round in sequence. """
- state = self.shiftRows(state, True)
- state = self.subBytes(state, True)
- state = self.addRoundKey(state, roundKey)
-
- #*py-kms*
- if self.v6:
- if roundKms == 4:
- state[0] ^= 0x73
- if roundKms == 6:
- state[0] ^= 0x09
- if roundKms == 8:
- state[0] ^= 0xE4
-
- state = self.mixColumns(state, True)
- return state
-
-
- def aes_main(self, state, expandedKey, nbrRounds):
- """ Method to do the AES encryption for one round.
-
- Perform the initial operations, the standard round and the
- final operations of the forward AES, creating a round key for each round.
- """
- state = self.addRoundKey(state, self.createRoundKey(expandedKey, 0))
- i = 1
- while i < nbrRounds:
- state = self.aes_round(state, self.createRoundKey(expandedKey, 16 * i), i)
- i += 1
- state = self.subBytes(state, False)
- state = self.shiftRows(state, False)
- state = self.addRoundKey(state, self.createRoundKey(expandedKey, 16 * nbrRounds))
- return state
-
-
- def aes_invMain(self, state, expandedKey, nbrRounds):
- """ Method to do the inverse AES encryption for one round.
-
- Perform the initial operations, the standard round, and the
- final operations of the inverse AES, creating a round key for each round.
- """
- state = self.addRoundKey(state, self.createRoundKey(expandedKey, 16 * nbrRounds))
- i = nbrRounds - 1
- while i > 0:
- state = self.aes_invRound(state, self.createRoundKey(expandedKey, 16 * i), i)
- i -= 1
- state = self.shiftRows(state, True)
- state = self.subBytes(state, True)
- state = self.addRoundKey(state, self.createRoundKey(expandedKey, 0))
- return state
-
- def encrypt(self, iput, key, size):
- """ Method to encrypt a 128 bit input block against the given key
- of size specified.
- """
- output = [0] * 16
- # The number of rounds.
- nbrRounds = 0
- # The 128 bit block to encode.
- block = [0] * 16
- # Set the number of rounds.
- if size == self.KeySize["SIZE_128"]:
- nbrRounds = 10
- elif size == self.KeySize["SIZE_192"]:
- nbrRounds = 12
- elif size == self.KeySize["SIZE_256"]:
- nbrRounds = 14
- # *py-kms* The KMS v4 parameters.
- elif size == 20:
- nbrRounds = 11
- else:
- raise ValueError("Wrong key size given ({}).".format(size))
-
- # The expanded keySize.
- expandedKeySize = 16 * (nbrRounds + 1)
-
- # Set the block values, for the block:
- # a[0,0] a[0,1] a[0,2] a[0,3]
- # a[1,0] a[1,1] a[1,2] a[1,3]
- # a[2,0] a[2,1] a[2,2] a[2,3]
- # a[3,0] a[3,1] a[3,2] a[3,3]
- # the mapping order is a[0,0] a[1,0] a[2,0] a[3,0] a[0,1] a[1,1] ... a[2,3] a[3,3]
-
- # Iterate over the columns and over the rows.
- for i in range(4):
- for j in range(4):
- block[i + j * 4] = iput[i * 4 +j]
-
- # Expand the key into an 176, 208, 240 bit key
- expandedKey = self.expandKey(key, size, expandedKeySize)
-
- # Encrypt the block using the expandedKey.
- block = self.aes_main(block, expandedKey, nbrRounds)
-
- # Unmap the block again into the output.
- for k in range(4):
- for l in range(4):
- output[k * 4 + l] = block[k + l * 4]
- return output
-
-
- def decrypt(self, iput, key, size):
- """ Method to decrypt a 128 bit input block against the given key
- of size specified.
- """
- output = [0] * 16
- # The number of rounds.
- nbrRounds = 0
- # The 128 bit block to decode.
- block = [0] * 16
- # Set the number of rounds.
- if size == self.KeySize["SIZE_128"]:
- nbrRounds = 10
- elif size == self.KeySize["SIZE_192"]:
- nbrRounds = 12
- elif size == self.KeySize["SIZE_256"]:
- nbrRounds = 14
- #*py-kms* The KMS v4 parameters.
- elif size == 20:
- nbrRounds = 11
- else:
- raise ValueError("Wrong key size given ({}).".format(size))
-
- # The expanded keySize.
- expandedKeySize = 16 * (nbrRounds + 1)
-
- # Set the block values, for the block:
- # a[0,0] a[0,1] a[0,2] a[0,3]
- # a[1,0] a[1,1] a[1,2] a[1,3]
- # a[2,0] a[2,1] a[2,2] a[2,3]
- # a[3,0] a[3,1] a[3,2] a[3,3]
- # the mapping order is a[0,0] a[1,0] a[2,0] a[3,0] a[0,1] a[1,1] ... a[2,3] a[3,3]
-
- # Iterate over the columns and the rows.
- for i in range(4):
- for j in range(4):
- block[i + j * 4] = iput[i * 4 + j]
-
- # Expand the key into an 176, 208, 240 bit key.
- expandedKey = self.expandKey(key, size, expandedKeySize)
- # Decrypt the block using the expandedKey.
- block = self.aes_invMain(block, expandedKey, nbrRounds)
- # Unmap the block again into the output.
- for k in range(4):
- for l in range(4):
- output[k * 4 +l] = block[k + l * 4]
- return output
-
-
-class AESModeOfOperation( object ):
- """ Class implementing the different AES mode of operations. """
-
- aes = AES()
-
- # Supported modes of operation.
- ModeOfOperation = {
- "OFB": 0,
- "CFB": 1,
- "CBC": 2
- }
-
- def convertString(self, string, start, end, mode):
- """ Method to convert a 16 character string into a number array. """
- if end - start > 16:
- end = start + 16
- if mode == self.ModeOfOperation["CBC"]:
- ar = [0] * 16
- else:
- ar = []
-
- i = start
- j = 0
- while len(ar) < end - start:
- ar.append(0)
- while i < end:
- ar[j] = string[i]
- j += 1
- i += 1
- return ar
-
-
- def encrypt(self, stringIn, mode, key, size, IV):
- """ Method to perform the encryption operation.
-
- @param stringIn: input string to be encrypted
- @param mode: mode of operation (0, 1 or 2)
- @param key: a hex key of the bit length size
- @param size: the bit length of the key (16, 24 or 32)
- @param IV: the 128 bit hex initilization vector
- @return tuple with mode of operation, length of the input and the encrypted data
- """
- if len(key) % size:
- raise ValueError("Illegal size ({}) for key '{}'.".format(size, key))
- if len(IV) % 16:
- raise ValueError("IV is not a multiple of 16.")
- # The AES input/output.
- plaintext = []
- iput = [0] * 16
- output = []
- ciphertext = [0] * 16
- # The output cipher string.
- cipherOut = []
-
- firstRound = True
- if stringIn != None:
- for j in range(int(math.ceil(float(len(stringIn))/16))):
- start = j * 16
- end = j * 16 + 16
- if end > len(stringIn):
- end = len(stringIn)
- plaintext = self.convertString(stringIn, start, end, mode)
-
- if mode == self.ModeOfOperation["CFB"]:
- if firstRound:
- output = self.aes.encrypt(IV, key, size)
- firstRound = False
- else:
- output = self.aes.encrypt(iput, key, size)
- for i in range(16):
- if len(plaintext) - 1 < i:
- ciphertext[i] = 0 ^ output[i]
- elif len(output) - 1 < i:
- ciphertext[i] = plaintext[i] ^ 0
- elif len(plaintext) - 1 < i and len(output) < i:
- ciphertext[i] = 0 ^ 0
- else:
- ciphertext[i] = plaintext[i] ^ output[i]
- for k in range(end - start):
- cipherOut.append(ciphertext[k])
- iput = ciphertext
-
- elif mode == self.ModeOfOperation["OFB"]:
- if firstRound:
- output = self.aes.encrypt(IV, key, size)
- firstRound = False
- else:
- output = self.aes.encrypt(iput, key, size)
- for i in range(16):
- if len(plaintext) - 1 < i:
- ciphertext[i] = 0 ^ output[i]
- elif len(output) - 1 < i:
- ciphertext[i] = plaintext[i] ^ 0
- elif len(plaintext) - 1 < i and len(output) < i:
- ciphertext[i] = 0 ^ 0
- else:
- ciphertext[i] = plaintext[i] ^ output[i]
- for k in range(end - start):
- cipherOut.append(ciphertext[k])
- iput = output
-
- elif mode == self.ModeOfOperation["CBC"]:
- for i in range(16):
- if firstRound:
- iput[i] = plaintext[i] ^ IV[i]
- else:
- iput[i] = plaintext[i] ^ ciphertext[i]
- firstRound = False
- ciphertext = self.aes.encrypt(iput, key, size)
- # Always 16 bytes because of the padding for CBC.
- for k in range(16):
- cipherOut.append(ciphertext[k])
- return mode, len(stringIn), cipherOut
-
-
- def decrypt(self, cipherIn, originalsize, mode, key, size, IV):
- """ Method to perform the decryption operation.
-
- @param cipherIn: encrypted string to be decrypted
- @param originalsize: unencrypted string length (required for CBC)
- @param mode: mode of operation (0, 1 or 2)
- @param key: a number array of the bit length size
- @param size: the bit length of the key (16, 24 or 32)
- @param IV: the 128 bit number array initilization vector
- @return decrypted data
- """
- if len(key) % size:
- raise ValueError("Illegal size ({}) for key '{}'.".format(size, key))
- if len(IV) % 16:
- raise ValueError("IV is not a multiple of 16.")
- # The AES input/output.
- ciphertext = []
- iput = []
- output = []
- plaintext = [0] * 16
- # The output plain text character list.
- chrOut = []
-
- firstRound = True
- if cipherIn != None:
- for j in range(int(math.ceil(float(len(cipherIn))/16))):
- start = j * 16
- end = j * 16 + 16
- if j * 16 + 16 > len(cipherIn):
- end = len(cipherIn)
- ciphertext = cipherIn[start:end]
-
- if mode == self.ModeOfOperation["CFB"]:
- if firstRound:
- output = self.aes.encrypt(IV, key, size)
- firstRound = False
- else:
- output = self.aes.encrypt(iput, key, size)
- for i in range(16):
- if len(output) - 1 < i:
- plaintext[i] = 0 ^ ciphertext[i]
- elif len(ciphertext) - 1 < i:
- plaintext[i] = output[i] ^ 0
- elif len(output) - 1 < i and len(ciphertext) < i:
- plaintext[i] = 0 ^ 0
- else:
- plaintext[i] = output[i] ^ ciphertext[i]
- for k in range(end - start):
- chrOut.append(plaintext[k])
- iput = ciphertext
-
- elif mode == self.ModeOfOperation["OFB"]:
- if firstRound:
- output = self.aes.encrypt(IV, key, size)
- firstRound = False
- else:
- output = self.aes.encrypt(iput, key, size)
- for i in range(16):
- if len(output) - 1 < i:
- plaintext[i] = 0 ^ ciphertext[i]
- elif len(ciphertext) - 1 < i:
- plaintext[i] = output[i] ^ 0
- elif len(output) - 1 < i and len(ciphertext) < i:
- plaintext[i] = 0 ^ 0
- else:
- plaintext[i] = output[i] ^ ciphertext[i]
- for k in range(end - start):
- chrOut.append(plaintext[k])
- iput = output
-
- elif mode == self.ModeOfOperation["CBC"]:
- output = self.aes.decrypt(ciphertext, key, size)
- for i in range(16):
- if firstRound:
- plaintext[i] = IV[i] ^ output[i]
- else:
- plaintext[i] = iput[i] ^ output[i]
- firstRound = False
- if originalsize is not None and originalsize < end:
- for k in range(originalsize - start):
- chrOut.append(plaintext[k])
- else:
- for k in range(end - start):
- chrOut.append(plaintext[k])
- iput = ciphertext
- return chrOut
-
-
-def encryptData(key, data, mode=AESModeOfOperation.ModeOfOperation["CBC"]):
- """ Module function to encrypt the given data with the given key.
-
- @param key: key to be used for encryption
- @param data: data to be encrypted
- @param mode: mode of operations (0, 1 or 2)
- @return encrypted data prepended with the initialization vector
- """
- if mode == AESModeOfOperation.ModeOfOperation["CBC"]:
- data = append_PKCS7_padding(data)
-
- keysize = len(key)
- assert keysize in AES.KeySize.values(), 'invalid key size: {}'.format(keysize)
- # Create a new iv using random data.
- iv = os.urandom(16)
- moo = AESModeOfOperation()
- (mode, length, ciph) = moo.encrypt(data, mode, key, keysize, iv)
- # With padding, the original length does not need to be known.
- # It's a bad idea to store the original message length prepend the iv.
- return iv + bytes(ciph)
-
-def decryptData(key, data, mode=AESModeOfOperation.ModeOfOperation["CBC"]):
- """ Module function to decrypt the given data with the given key.
-
- @param key: key to be used for decryption
- @param data: data to be decrypted with initialization vector prepended
- @param mode: mode of operations (0, 1 or 2)
- @return decrypted data
- """
- keysize = len(key)
- assert keysize in AES.KeySize.values(), 'invalid key size: {}'.format(keysize)
- # iv is first 16 bytes.
- iv = data[:16]
- data = data[16:]
- moo = AESModeOfOperation()
- decr = moo.decrypt(data, None, mode, key, keysize, iv)
- if mode == AESModeOfOperation.ModeOfOperation["CBC"]:
- decr = strip_PKCS7_padding(decr)
- return decr
-
-
-class Test(object):
- def generateRandomKey(self, keysize):
- """ Generates a key from random data of length `keysize`.
- The returned key is a string of bytes.
- """
- if keysize not in (16, 24, 32):
- raise ValueError('Invalid keysize, %s. Should be one of (16, 24, 32).' % keysize)
- return os.urandom(keysize)
-
- def testString(self, cleartext, keysize = 16, modeName = "CBC"):
- """ Test with random key, choice of mode. """
- print('Random key test with Mode:', modeName)
- print('ClearText:', cleartext)
- key = self.generateRandomKey(keysize)
- print('Key:', bytes([x for x in key]))
- mode = AESModeOfOperation.ModeOfOperation[modeName]
- cipher = encryptData(key, cleartext, mode)
- print('Cipher:', bytes([x for x in cipher]))
- decr = decryptData(key, cipher, mode)
- print('Decrypted:', bytes(decr))
-
-
-if __name__ == "__main__":
- moo = AESModeOfOperation()
- cleartext = "This is a test with several blocks ! Some utf-8 characters åäö and test continues"
- print('ClearText: %s\n' % cleartext)
- cleartext = bytes(cleartext, 'utf-8')
-
- cipherkey = [143, 194, 34, 208, 145, 203, 230, 143, 177, 246, 97, 206, 145, 92, 255, 84]
- iv = [103, 35, 148, 239, 76, 213, 47, 118, 255, 222, 123, 176, 106, 134, 98, 92]
- mode, orig_len, ciph = moo.encrypt(cleartext, moo.ModeOfOperation["CBC"],
- cipherkey, moo.aes.KeySize["SIZE_128"], iv)
- print('Encrypt result: mode = %s, length = %s (%s), encrypted = %s\n' % (mode, orig_len, len(cleartext), bytes(ciph)))
-
- decr = moo.decrypt(ciph, orig_len, mode, cipherkey, moo.aes.KeySize["SIZE_128"], iv)
- print('Decrypt result: %s\n' % bytes(decr))
- Test().testString(cleartext, 16, "CBC")