diff options
Diffstat (limited to 'django/srpproject/srp')
| -rw-r--r-- | django/srpproject/srp/aes.py | 655 | ||||
| -rw-r--r-- | django/srpproject/srp/views.py | 36 |
2 files changed, 690 insertions, 1 deletions
diff --git a/django/srpproject/srp/aes.py b/django/srpproject/srp/aes.py new file mode 100644 index 0000000..4c27d41 --- /dev/null +++ b/django/srpproject/srp/aes.py @@ -0,0 +1,655 @@ +#!/usr/bin/python +# +# 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/ +# +import os +import sys +import math + +def append_PKCS7_padding(s): + """return s padded to a multiple of 16-bytes by PKCS7 padding""" + numpads = 16 - (len(s)%16) + return s + numpads*chr(numpads) + +def strip_PKCS7_padding(s): + """return s stripped of PKCS7 padding""" + if len(s)%16 or not s: + raise ValueError("String of len %d can't be PCKS7-padded" % len(s)) + numpads = ord(s[-1]) + if numpads > 16: + raise ValueError("String ending with %r can't be PCKS7-padded" % s[-1]) + return s[:-numpads] + +class AES(object): + # valid key sizes + keySize = dict(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] + + def getSBoxValue(self,num): + """Retrieves a given S-Box Value""" + return self.sbox[num] + + def getSBoxInvert(self,num): + """Retrieves a given Inverted S-Box Value""" + return self.rsbox[num] + + def rotate(self, word): + """ Rijndael's key schedule rotate operation. + + Rotate a word eight bits to the left: eg, rotate(1d2c3a4f) == 2c3a4f1d + Word is an char list of size 4 (32 bits overall). + """ + return word[1:] + word[:1] + + # 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 getRconValue(self, num): + """Retrieves a given Rcon Value""" + return self.Rcon[num] + + def core(self, word, iteration): + """Key schedule core.""" + # 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): + """Rijndael's key expansion. + + Expands an 128,192,256 key into an 176,208,240 bytes key + + expandedKey is a char list of large enough size, + key is the non-expanded 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): + """Adds (XORs) the round key to the state.""" + for i in range(16): + state[i] ^= roundKey[i] + return state + + def createRoundKey(self, expandedKey, roundKeyPointer): + """Create a round key. + 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): + """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 + + # + # substitute all the values from the state with the value in the SBox + # using the state value as index for the SBox + # + def subBytes(self, state, isInv): + if isInv: getter = self.getSBoxInvert + else: getter = self.getSBoxValue + for i in range(16): state[i] = getter(state[i]) + return state + + # iterate over the 4 rows and call shiftRow() with that row + def shiftRows(self, state, isInv): + for i in range(4): + state = self.shiftRow(state, i*4, i, isInv) + return state + + # each iteration shifts the row to the left by 1 + def shiftRow(self, state, statePointer, nbr, isInv): + 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 + + # galois multiplication of the 4x4 matrix + def mixColumns(self, state, isInv): + # 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 + + # galois multiplication of 1 column of the 4x4 matrix + def mixColumn(self, column, isInv): + 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 + + # applies the 4 operations of the forward round in sequence + def aes_round(self, state, roundKey): + state = self.subBytes(state, False) + state = self.shiftRows(state, False) + state = self.mixColumns(state, False) + state = self.addRoundKey(state, roundKey) + return state + + # applies the 4 operations of the inverse round in sequence + def aes_invRound(self, state, roundKey): + state = self.shiftRows(state, True) + state = self.subBytes(state, True) + state = self.addRoundKey(state, roundKey) + state = self.mixColumns(state, True) + return state + + # Perform the initial operations, the standard round, and the final + # operations of the forward aes, creating a round key for each round + def aes_main(self, state, expandedKey, nbrRounds): + state = self.addRoundKey(state, self.createRoundKey(expandedKey, 0)) + i = 1 + while i < nbrRounds: + state = self.aes_round(state, + self.createRoundKey(expandedKey, 16*i)) + i += 1 + state = self.subBytes(state, False) + state = self.shiftRows(state, False) + state = self.addRoundKey(state, + self.createRoundKey(expandedKey, 16*nbrRounds)) + return state + + # Perform the initial operations, the standard round, and the final + # operations of the inverse aes, creating a round key for each round + def aes_invMain(self, state, expandedKey, nbrRounds): + 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 -= 1 + state = self.shiftRows(state, True) + state = self.subBytes(state, True) + state = self.addRoundKey(state, self.createRoundKey(expandedKey, 0)) + return state + + # encrypts a 128 bit input block against the given key of size specified + def encrypt(self, iput, key, size): + 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 + else: return None + + # the expanded keySize + expandedKeySize = 16*(nbrRounds+1) + + # Set the block values, for the block: + # a0,0 a0,1 a0,2 a0,3 + # a1,0 a1,1 a1,2 a1,3 + # a2,0 a2,1 a2,2 a2,3 + # a3,0 a3,1 a3,2 a3,3 + # the mapping order is a0,0 a1,0 a2,0 a3,0 a0,1 a1,1 ... a2,3 a3,3 + # + # iterate over the columns + for i in range(4): + # iterate over the rows + for j in range(4): + block[(i+(j*4))] = iput[(i*4)+j] + + # expand the key into an 176, 208, 240 bytes key + # the expanded 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): + # iterate over the rows + for l in range(4): + output[(k*4)+l] = block[(k+(l*4))] + return output + + # decrypts a 128 bit input block against the given key of size specified + def decrypt(self, iput, key, size): + 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 + else: return None + + # the expanded keySize + expandedKeySize = 16*(nbrRounds+1) + + # Set the block values, for the block: + # a0,0 a0,1 a0,2 a0,3 + # a1,0 a1,1 a1,2 a1,3 + # a2,0 a2,1 a2,2 a2,3 + # a3,0 a3,1 a3,2 a3,3 + # the mapping order is a0,0 a1,0 a2,0 a3,0 a0,1 a1,1 ... a2,3 a3,3 + + # iterate over the columns + for i in range(4): + # iterate over the rows + for j in range(4): + block[(i+(j*4))] = iput[(i*4)+j] + # expand the key into an 176, 208, 240 bytes 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): + # iterate over the rows + for l in range(4): + output[(k*4)+l] = block[(k+(l*4))] + return output + + +class AESModeOfOperation(object): + + aes = AES() + + # structure of supported modes of operation + modeOfOperation = dict(OFB=0, CFB=1, CBC=2) + + # converts a 16 character string into a number array + def convertString(self, string, start, end, mode): + 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] = ord(string[i]) + j += 1 + i += 1 + return ar + + # Mode of Operation Encryption + # stringIn - Input String + # mode - mode of type modeOfOperation + # hexKey - a hex key of the bit length size + # size - the bit length of the key + # hexIV - the 128 bit hex Initilization Vector + def encrypt(self, stringIn, mode, key, size, IV): + if len(key) % size: + return None + if len(IV) % 16: + return None + # the AES input/output + plaintext = [] + iput = [0] * 16 + output = [] + ciphertext = [0] * 16 + # the output cipher string + cipherOut = [] + # char firstRound + 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) + # print 'PT@%s:%s' % (j, plaintext) + 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] + # print 'IP@%s:%s' % (j, iput) + 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 + + # Mode of Operation Decryption + # cipherIn - Encrypted String + # originalsize - The unencrypted string length - required for CBC + # mode - mode of type modeOfOperation + # key - a number array of the bit length size + # size - the bit length of the key + # IV - the 128 bit number array Initilization Vector + def decrypt(self, cipherIn, originalsize, mode, key, size, IV): + # cipherIn = unescCtrlChars(cipherIn) + if len(key) % size: + return None + if len(IV) % 16: + return None + # the AES input/output + ciphertext = [] + iput = [] + output = [] + plaintext = [0] * 16 + # the output plain text string + stringOut = '' + # char firstRound + 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): + stringOut += chr(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): + stringOut += chr(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): + stringOut += chr(plaintext[k]) + else: + for k in range(end-start): + stringOut += chr(plaintext[k]) + iput = ciphertext + return stringOut + + +def encryptData(key, data, mode=AESModeOfOperation.modeOfOperation["CBC"]): + """encrypt `data` using `key` + + `key` should be a string of bytes. + + returned cipher is a string of bytes prepended with the initialization + vector. + + """ + key = map(ord, key) + data = append_PKCS7_padding(data) + keysize = len(key) + assert keysize in AES.keySize.values(), 'invalid key size: %s' % keysize + # create a new iv using random data + iv = [ord(i) for i in 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 ''.join(map(chr, iv)) + ''.join(map(chr, ciph)) + +def decryptData(key, data, mode=AESModeOfOperation.modeOfOperation["CBC"]): + """decrypt `data` using `key` + + `key` should be a string of bytes. + + `data` should have the initialization vector prepended as a string or + ordinal values. + + """ + + key = map(ord, key) + keysize = len(key) + assert keysize in AES.keySize.values(), 'invalid key size: %s' % keysize + # iv is first 16 bytes + iv = map(ord, data[:16]) + data = map(ord, data[16:]) + moo = AESModeOfOperation() + decr = moo.decrypt(data, None, mode, key, keysize, iv) + decr = strip_PKCS7_padding(decr) + return decr + +def generateRandomKey(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): + emsg = 'Invalid keysize, %s. Should be one of (16, 24, 32).' + raise ValueError, emsg % keysize + return os.urandom(keysize) + +if __name__ == "__main__": + moo = AESModeOfOperation() + cleartext = "This is a test!" + cypherkey = [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"], + cypherkey, moo.aes.keySize["SIZE_128"], iv) + print 'm=%s, ol=%s (%s), ciph=%s' % (mode, orig_len, len(cleartext), ciph) + decr = moo.decrypt(ciph, orig_len, mode, cypherkey, + moo.aes.keySize["SIZE_128"], iv) + print decr + diff --git a/django/srpproject/srp/views.py b/django/srpproject/srp/views.py index 8529fa9..cbf1389 100644 --- a/django/srpproject/srp/views.py +++ b/django/srpproject/srp/views.py @@ -25,6 +25,10 @@ def generate_fake_salt(I): salt_chars = "./" + string.ascii_letters + string.digits salt = "".join([random.choice(salt_chars) for i in range(0,16)]) return salt, int(hashlib.sha256("%s:%s" % (salt, settings.SECRET_KEY)).hexdigest(), 16) + +def test_aes(request): + from django.shortcuts import render_to_response + return render_to_response('aes.html',{'static_files': "http://%s/srp-test/javascript" % request.get_host()}) def login_page(request): from django.shortcuts import render_to_response @@ -150,7 +154,8 @@ def upgrade_add_verifier(request): from django.contrib.auth.models import User import hashlib salt = generate_salt() - x = int(hashlib.sha256(salt + hashlib.sha256("%s:%s" % (request.session["srp_I"], request.POST["p"])).hexdigest()).hexdigest(), 16) + key = hashlib.sha256(request.session["srp_S"]).hexdigest() + x = int(hashlib.sha256(salt + hashlib.sha256("%s:%s" % (request.session["srp_I"], decrypt(request.POST["p"], key, int(request.POST["l"])))).hexdigest()).hexdigest(), 16) user = User.objects.get(username=request.session["srp_I"]) srpuser = SRPUser() srpuser.__dict__.update(user.__dict__) @@ -159,3 +164,32 @@ def upgrade_add_verifier(request): srpuser.password = "" srpuser.save() return HttpResponse("<ok/>", mimetype="text/xml") + +def decrypt(c, key, plen): + from srp import aes + import base64 + moo = aes.AESModeOfOperation() + cypherkey = map(ord, key.decode("hex")) + try: + ciphertext = base64.b64decode(c.replace("_", "+")) + except TypeError: + return HttpResponse("<error>%s</error>" % request.POST["c"], mimetype="text/xml" ) + iv = map(ord, ciphertext[:16]) + ciphertext= map(ord, ciphertext[16:]) + return moo.decrypt(ciphertext, 0, moo.modeOfOperation["CFB"], cypherkey, len(cypherkey), iv)[:plen] + + +def doaes(request): + from srp import aes + import base64 + moo = aes.AESModeOfOperation() + cypherkey = map(ord, "6754c921b8dcbd1f8b58748cd87ac60ce857314687a65df05c470a46f438842c".decode("hex")) + try: + ciphertext = base64.b64decode(request.POST["c"].replace("_", "+")) + except TypeError: + return HttpResponse("<error>%s</error>" % request.POST["c"], mimetype="text/xml" ) + iv = map(ord, ciphertext[:16]) + ciphertext= map(ord, ciphertext[16:]) + # (self, cipherIn, originalsize, mode, key, size, IV): + plaintext = moo.decrypt(ciphertext, int(request.POST["l"]), moo.modeOfOperation["OFB"], cypherkey, len(cypherkey), iv)[:int(request.POST["l"])] + return HttpResponse("<P>%s</P>" % plaintext, mimetype="text/xml" ) |