#!/usr/bin/env python
import sys
 
alphaL = "abcdefghijklnmopqrstuvqxyz"
alphaU = "ABCDEFGHIJKLMNOPQRSTUVQXYZ"
num    = "0123456789"
keychars = num+alphaL+alphaU
 
 
key = "T0pS3cre7key"
if not key.isalnum():
  print "Your key is invalid, it may only be alphanumeric characters"
  sys.exit()
 
plaintext = "???"
 
ciphertext = ""
decipher = ""
for i in range(len(plaintext)):
  rotate_amount = keychars.index(key[i%len(key)])
  if plaintext[i] in alphaL:
    enc_char = ord('a') + (ord(plaintext[i])-ord('a')+rotate_amount)%26
    decipher = chr(enc_char)
  elif plaintext[i] in alphaU:
    enc_char = ord('A') + (ord(plaintext[i])-ord('A')+rotate_amount)%26
    decipher = chr(enc_char)
  elif plaintext[i] in num:
    enc_char = ord('0') + (ord(plaintext[i])-ord('0')+rotate_amount)%10
    decipher = chr(enc_char)
  else:
    enc_char = ord(plaintext[i])
    decipher = chr(enc_char)
  ciphertext = ciphertext + chr(enc_char)
  decipher = chr(enc_char) + decipher
 
print "Encryption complete, ENC(%s,%s) = %s"%(plaintext,key,decipher)
 

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#!/usr/bin/env python
import sys

alphaL = "abcdefghijklnmopqrstuvqxyz"
alphaU = "ABCDEFGHIJKLMNOPQRSTUVQXYZ"
num    = "0123456789"
keychars = num+alphaL+alphaU


key = "T0pS3cre7key"
if not key.isalnum():
  print "Your key is invalid, it may only be alphanumeric characters"
  sys.exit()

ciphertext = "Bot kmws mikferuigmzf rmfrxrwqe abs perudsf! Nvm kda ut ab8bv_w4ue0_ab8v_DDU"
plaintext = ""
ciphertext = ""

for i in range(len(ciphertext)):
  rotate_amount = keychars.index(key[i%len(key)])
  if plaintext[i] in alphaL:
    enc_char = ord('a') + (ord(ciphertext[i])+ord('a')+rotate_amount)%26

  elif plaintext[i] in alphaU:
    enc_char = ord('A') + (ord(ciphertext[i])+ord('A')+rotate_amount)%26

  elif plaintext[i] in num:
    enc_char = ord('0') + (ord(ciphertext[i])+ord('0')+rotate_amount)%10

  else:
    enc_char = ord(plaintext[i])

  plaintext = plaintext + chr(enc_char)
  

print "Encryption complete, ENC(%s,%s) = %s"%(plaintext,key,ciphertext)