GnnForPrivacyScan/data/purposeSplit/Hash/Encryption_And_Hashing/Task5_3.py

def rsa(message,size):
   start = timer()
   key = RSA.generate(size)
   key_gen_time=  timer() - start
   
   cipher = PKCS1_OAEP.new(key.publickey())
   buffer=""
   chunks=[]
   size=214
   parts=int(len(message)/size)
   x=0
   for i in range(parts):
       chunks.append(message[size*i:size*(i+1)])
       x=i
       
   chunks.append(message[(x+1)*size:])
   ciphers=[]
   start = timer() 
   for chunk in chunks:
       chunk_bytes=chunk.encode("utf-8")
       ciphertext = cipher.encrypt(chunk_bytes)
       ciphers.append(ciphertext)
   encrypt_time=timer() - start
   #decryption
   cipher = PKCS1_OAEP.new(key)
   start = timer()  
   for ciphertext in ciphers:
       pt = cipher.decrypt(ciphertext)
       buffer+=pt.decode("utf-8")
   decrypt_time = timer() - start
   if buffer==message:
       print("successfull encryption and decryption")
   else:
       print("Incorrect encryption/decryption")
   print("time taken for key gen ",(key_gen_time))
   print("time taken to encrypt ",(encrypt_time))
   print("Time Taken to Encrypt per byte is ",((encrypt_time)/len(message)))
   print("time taken to Decrypt ",(decrypt_time))
   print("Time Taken to Decrypt per byte is ",((decrypt_time)/len(message)))
   
generateFiles()
kbData=getData("kbfile.txt")
mbData=getData("mbfile.txt")
rsa(kbData,2048)
rsa(mbData,2048)