Added single byte XOR cipher bruteforce for hex encoded text

crypttool.py

@@ -1,8 +1,43 @@
 #!/usr/bin/env python
-import sys, string, types, hashlib, base64, re, urllib
+import sys, string, types, hashlib, base64, re, urllib, binascii
+import operator
+from collections import Counter
 
 LOWER_LETTERS = [chr(x) for x in range(97, 123)]
 UPPER_LETTERS = [chr(x) for x in range(65, 91)]
+COMMON_LETTERS = 'ETAOIN SHRDLU'
+
+def xorSingleBrute(encoded='', keybytes=1):
+    resultList = dict()
+    if(encoded == ''):
+        encoded = raw_input('Input your Hex String:')
+    for xor_key in range(0, 2**(keybytes*8)):
+        decoded = '';
+        for i, j in zip(encoded[::2], encoded[1::2]):
+            decoded += ''.join(chr(int(i+j, 16) ^ xor_key))
+        #if (all(c in string.printable for c in decoded)):
+        #if isHumanReadable(decoded):
+            #print(xor_key, decoded)
+        resultList[decoded] = commonCounter(decoded)
+    sortedResults = sorted(resultList.items(), key=operator.itemgetter(1))
+    
+    for result, key in sortedResults[-20:]:
+        #if (all(c in string.printable for c in result)):
+        print(result)    
+
+def commonCounter(inputString, limit=7):
+    countObj = Counter(inputString.upper())
+    common = countObj & Counter(COMMON_LETTERS)
+    return sum(common.values())
+
+def fixedxor(string1 = '', string2 = ''):
+    if(string1 == ''):
+        string1 = raw_input("Please input your first hex string: ")
+        string2 = raw_input("Please input your second hex string: ")
+    hex1 = int(string1, 16)
+    hex2 = int(string2, 16)
+    result = hex1 ^ hex2
+    print(hex(result))
 
 def rot(inputString, amount):
     outputString = "" 
@@ -135,19 +170,29 @@ print("3: Translation")
 print("4: Base64 Encoder/Decoder")
 print("5: String Reverser")
 print("6: URL Encoder")
-choice = input("Please make a selection: ")
-if (choice == 1):
+print("7: Fixed XOR")
+print("8: XOR Bruteforce Single Byte ")
+choice = raw_input("Please make a selection: ")
+if (choice == "1"):
     rotPrompt()
-elif (choice == 2):
+elif (choice == "2"):
     hashPrompt()
-elif (choice == 3):
+elif (choice == "3"):
     translatePrompt()
-elif(choice == 4):
+elif(choice == "4"):
     base64prompt()
-elif(choice == 5):
+elif(choice == "5"):
     reverser()
-elif(choice == 6):
+elif(choice == "6"):
     urlEncoder()
+elif(choice[0] == "7"):
+    if(len(choice) > 1):
+        argList = choice.split(" ")
+        fixedxor(argList[1], argList[2])
+    else:
+        fixedxor()
+elif(choice == "8"):
+    xorSingleBrute()
 
 print("Thank you for flying with PankiCrypt Airlines!")