[Tutor] i dont understand this code

[piyush joshi]

Can anyone help me out in understanding this code

 

#

 

import os

 

rotationMatrix1 = [7, 1, 5, 3, 0, 6, 2, 5, 2, 3, 0, 6, 1, 7, 6, 1, 5, 2, 7,
1, 0, 3, 7, 6, 1, 0, 5, 2, 1, 5, 7, 3, 2, 0, 6]

rotationMatrix2 = [1, 6, 2, 5, 7, 3, 0, 7, 1, 6, 2, 5, 0, 3, 0, 6, 5, 1, 1,
7, 2, 5, 2, 3, 7, 6, 2, 1, 3, 7, 6, 5, 0, 1, 7]

 

keyboardDict = {  2: '1',  3: '2',  4: '3',  5: '4',  6: '5',  7: '6',  8:
'7',  9: '8', 10: '9', 11: '0',

                 16: 'q', 17: 'w', 18: 'e', 19: 'r', 20: 't', 21: 'y', 22:
'u', 23: 'i', 24: 'o', 25: 'p',

                 30: 'a', 31: 's', 32: 'd', 33: 'f', 34: 'g', 35: 'h', 36:
'j', 37: 'k', 38: 'l', 

                 44: 'z', 45: 'x', 46: 'c', 47: 'v', 48: 'b', 49: 'n', 50:
'm' }

 

def keyboardEncToAscii(inKey):

                out = ""

                for c in inKey:

                                if c == 0: return out

                                if c in keyboardDict: out += keyboardDict[c]

                                else: return ""

                return out

 

def decryptHash(hash, key, rotationMatrix):

                outhash = []

                for i in range(0, len(hash)):

                                outhash.append(((hash[i] <<
(rotationMatrix[7*key+i])) & 0xFF) | (hash[i] >>
(8-rotationMatrix[7*key+i])))

                return outhash

 

 

print("")

print("hexa decimal code")

print("hexadecimal code from which the password can be calculated,")

print("07088120410C0000")

print("")

print("Please enter the code: ")

code = raw_input()

hash = []

for i in range(1, len(code) // 2):

                hash.append(int(code[2*i]+code[2*i+1],16))

key = int(code[0:2], 16) % 5

 

password = keyboardEncToAscii(decryptHash(hash, key, rotationMatrix1))

if password == "":

                password = keyboardEncToAscii(decryptHash(hash, key,
rotationMatrix2))

if password == "":

                print("The password could not be calculated. Bummer.")

else:

                print("The password is: " + password)

 

if (os.name == 'nt'):

                print("Press a key to exit...")

                raw_input()



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