def decrypt(self,ciphertext):
newciphertext = ''
plaintext = [0 for c in ciphertext]
bitstring = ''
for m in ciphertext.upper():
if m in self.letters:
newciphertext = newciphertext + m
scrambled = self.scrambleKey(newciphertext)
nchars = len(newciphertext)
nchunks = int(math.ceil(nchars/20.0))
for ichunk in range(nchunks):
istart = ichunk*20
chunk = newciphertext[istart:istart+20]
for i in range(0,len(chunk)):
if len(chunk) < len(self.key):
kidx = i
else:
kidx = self.key[i]
ch = chunk[i]
numch = self.fdict[ch]
pstart = ichunk*20 + kidx*5
pend = pstart + 5
piblock = scrambled[pstart:pend]
pibits = cryptutils.list2bin(piblock)
pinum = cryptutils.bin2dec(pibits)
bitstring = bitstring + self.rdict[pinum]
numct = numch ^ pinum
plaintext[istart+kidx] = self.rdict[numct]
plaintext = ''.join(plaintext)
return (plaintext,bitstring)
def decrypt(self, ciphertext):
newciphertext = ''
plaintext = [0 for c in ciphertext]
bitstring = ''
for m in ciphertext.upper():
if m in self.letters:
newciphertext = newciphertext + m
scrambled = self.scrambleKey(newciphertext)
nchars = len(newciphertext)
nchunks = int(math.ceil(nchars / 20.0))
for ichunk in range(nchunks):
istart = ichunk * 20
chunk = newciphertext[istart:istart + 20]
for i in range(0, len(chunk)):
if len(chunk) < len(self.key):
kidx = i
else:
kidx = self.key[i]
ch = chunk[i]
numch = self.fdict[ch]
pstart = ichunk * 20 + kidx * 5
pend = pstart + 5
piblock = scrambled[pstart:pend]
pibits = cryptutils.list2bin(piblock)
pinum = cryptutils.bin2dec(pibits)
bitstring = bitstring + self.rdict[pinum]
numct = numch ^ pinum
plaintext[istart + kidx] = self.rdict[numct]
plaintext = ''.join(plaintext)
return (plaintext, bitstring)
def encrypt(self,message):
newmessage = ''
ciphertext = ''
bitstring = ''
for m in message.upper():
if m in self.letters:
newmessage = newmessage + m
scrambled = self.scrambleKey(newmessage)
nchars = len(newmessage)
nchunks = int(math.ceil(nchars/20.0))
for ichunk in range(nchunks):
#print 'Chunk %i' % ichunk
istart = ichunk*20
iend = istart + 20
if iend > len(newmessage)-1:
chunk = newmessage[istart:]
else:
chunk = newmessage[istart:istart+20]
for i in range(0,len(chunk)):
if len(chunk) < len(self.key):
kidx = i
else:
kidx = self.key[i]
ch = chunk[kidx]
numch = self.fdict[ch]
pstart = ichunk*20 + kidx*5
pend = pstart + 5
piblock = scrambled[pstart:pend]
pibits = cryptutils.list2bin(piblock)
pinum = cryptutils.bin2dec(pibits)
bitstring = bitstring + self.rdict[pinum]
numct = numch ^ pinum
ciphertext = ciphertext + self.rdict[numct]
#print '%2i %2i %2s %2i %4i %4i %-20s %2i %2i %s' % (i,kidx,ch,numch,pstart,pend,str(piblock),pinum,numct,ciphertext[-1])
return (ciphertext,bitstring)
def encrypt(self, message):
newmessage = ''
ciphertext = ''
bitstring = ''
for m in message.upper():
if m in self.letters:
newmessage = newmessage + m
scrambled = self.scrambleKey(newmessage)
nchars = len(newmessage)
nchunks = int(math.ceil(nchars / 20.0))
for ichunk in range(nchunks):
#print 'Chunk %i' % ichunk
istart = ichunk * 20
iend = istart + 20
if iend > len(newmessage) - 1:
chunk = newmessage[istart:]
else:
chunk = newmessage[istart:istart + 20]
for i in range(0, len(chunk)):
if len(chunk) < len(self.key):
kidx = i
else:
kidx = self.key[i]
ch = chunk[kidx]
numch = self.fdict[ch]
pstart = ichunk * 20 + kidx * 5
pend = pstart + 5
piblock = scrambled[pstart:pend]
pibits = cryptutils.list2bin(piblock)
pinum = cryptutils.bin2dec(pibits)
bitstring = bitstring + self.rdict[pinum]
numct = numch ^ pinum
ciphertext = ciphertext + self.rdict[numct]
#print '%2i %2i %2s %2i %4i %4i %-20s %2i %2i %s' % (i,kidx,ch,numch,pstart,pend,str(piblock),pinum,numct,ciphertext[-1])
return (ciphertext, bitstring)
