from Crypto.Hash import SHA256
from Crypto.Cipher import AES
import os, random, sys, pkg_resources

def encrypt(key, filename):
	chunksize = 64 * 1024
	outFile = os.path.join(os.path.dirname(filename), "(lock)"+os.path.basename(filename))
	filesize = str(os.path.getsize(filename)).zfill(16)
	IV = ''

	for i in range(16):
		IV += chr(random.randint(0, 0xFF))

	encryptor = AES.new(key, AES.MODE_CBC, IV)

	with open(filename, "rb") as infile:
		with open(outFile, "wb") as outfile:
			outfile.write(filesize)
			outfile.write(IV)
			while True:
				chunk = infile.read(chunksize)

				if len(chunk) == 0:
					break

				elif len(chunk) % 16 !=0:
					chunk += ' ' *  (16 - (len(chunk) % 16))

				outfile.write(encryptor.encrypt(chunk))


def decrypt(key, filename):
	outFile = os.path.join(os.path.dirname(filename), os.path.basename(filename[6:]))
	chunksize = 64 * 1024
	with open(filename, "rb") as infile:
		filesize = infile.read(16)
		IV = infile.read(16)

		decryptor = AES.new(key, AES.MODE_CBC, IV)

		with open(outFile, "wb") as outfile:
			while True:
				chunk = infile.read(chunksize)
				if len(chunk) == 0:
					break

				outfile.write(decryptor.decrypt(chunk))

			outfile.truncate(int(filesize))

def allfiles():
	allFiles = []
	for root, subfiles, files in os.walk(os.getcwd()):
		for names in files:
			allFiles.append(os.path.join(root, names))

	return allFiles


choice = raw_input("Apakah anda ingin (E)ncrypt atau (D)ecrypt? ")
password = raw_input("Enter the password: ")

encFiles = allfiles()

if choice == "E":
	for Tfiles in encFiles:
		if os.path.basename(Tfiles).startswith("(lock)"):
			print "%s sudah di encrypt" %str(Tfiles)
			pass

		elif Tfiles == os.path.join(os.getcwd(), sys.argv[0]):
			pass
		else:
			encrypt(SHA256.new(password).digest(), str(Tfiles))
			print "Selesai encrypting %s" %str(Tfiles)
			os.remove(Tfiles)

elif choice == "e":
	for Tfiles in encFiles:
		if os.path.basename(Tfiles).startswith("(lock)"):
			print "%s sudah di encrypt" %str(Tfiles)
			pass

		elif Tfiles == os.path.join(os.getcwd(), sys.argv[0]):
			pass
		else:
			encrypt(SHA256.new(password).digest(), str(Tfiles))
			print "Selesai encrypting %s" %str(Tfiles)
			os.remove(Tfiles)


elif choice == "D":
	filename = raw_input("Masukan nama file yang ingin di Decrypt ex: (encrypted)debian.phar : ")
	if not os.path.exists(filename):
		print "File tidak ada"
		sys.exit(0)
	elif not filename.startswith("(lock)"):
		print "%s File sudah di  encrypted" %filename
		sys.exit()
	else:
		decrypt(SHA256.new(password).digest(), filename)
		print "Selesai decrypting %s" %filename
		os.remove(filename)


elif choice == "d":
	filename = raw_input("Masukan nama file yang ingin di Decrypt ex: (encrypted)debian.phar : ")
	if not os.path.exists(filename):
		print "File tidak ada"
		sys.exit(0)
	elif not filename.startswith("(lock)"):
		print "%s File sudah di  encrypted" %filename
		sys.exit()
	else:
		decrypt(SHA256.new(password).digest(), filename)
		print "Selesai decrypting %s" %filename
		os.remove(filename)

else:
	print "Masukan pilihan yang benar."
	sys.exit()