Change space indent to tabs, added comments

Also removed some redundant code
This commit is contained in:
Evan Su 2021-03-13 12:11:06 -05:00 committed by GitHub
parent a8064641a5
commit 7ba80dd8a6
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1 changed files with 430 additions and 355 deletions

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@ -3,16 +3,20 @@
# Dependencies: argon2-cffi, pycryptodome
# Copyright (c) Evan Su (https://evansu.cc)
# Released under a GNU GPL v3 license
# Source: https://github.com/HACKERALERT/Picocrypt
# https://github.com/HACKERALERT/Picocrypt
# Test if libraries are installed
try:
from argon2.low_level import hash_secret_raw
from Crypto.Cipher import ChaCha20_Poly1305
from argon2.low_level import hash_secret_raw
from Crypto.Cipher import ChaCha20_Poly1305
except:
from os import system
system("python3 -m pip install argon2-cffi --user")
system("python3 -m pip install pycryptodome --user")
# Libraries missing, install them
from os import system
system("sudo apt-get install python3-tk")
system("python3 -m pip install argon2-cffi")
system("python3 -m pip install pycryptodome")
# Imports
from tkinter import filedialog,messagebox
from threading import Thread
from datetime import datetime
@ -28,10 +32,13 @@ import tkinter.ttk
import tkinter.scrolledtext
import webbrowser
# Global variables and notices
inputFile = ""
outputFile = ""
password = ""
ad = ""
kept = False
working = False
adString = "File metadata (used to store some text along with the file):"
passwordNotice = "Error. The provided password is incorrect."
corruptedNotice = "Error. The input file is corrupted."
@ -40,468 +47,531 @@ kCorruptedNotice = "The input file is corrupted, but the output has been kept."
kModifiedNotice = "The input file has been intentionally modified, but the output has been kept."
derivingNotice = "Deriving key (takes a few seconds)..."
keepNotice = "Keep decrypted output even if it's corrupted or modified"
kept = False
eraseNotice = "Securely erase and delete original file"
working = False
overwriteNotice = "Output file already exists. Would you like to overwrite it?"
unknownErrorNotice = "Unknown error occured. Please try again."
# Create root Tk
tk = tkinter.Tk()
#tk.tk.call('tk', 'scaling', 2.0)
tk.geometry("480x420")
tk.title("Picocrypt")
tk.configure(background="#f5f6f7")
tk.resizable(0,0)
favicon = tkinter.PhotoImage(file="./key.png")
tk.iconphoto(False,favicon)
# Try setting image if included with Picocrypt
try:
favicon = tkinter.PhotoImage(file="./key.png")
tk.iconphoto(False,favicon)
except:
pass
# Some styling
s = tkinter.ttk.Style()
s.configure("TCheckbutton",background="#f5f6f7")
# Event when user selects an input file
def inputSelected():
global inputFile,working
dummy.focus()
global inputFile,working
dummy.focus()
try:
suffix = ""
tmp = filedialog.askopenfilename(
initialdir=expanduser("~")
)
if len(tmp)==0:
raise Exception("No file selected.")
inputFile = tmp
if ".pcf" in inputFile.split("/")[-1]:
suffix = " (will be decrypted)"
fin = open(inputFile,"rb+")
adlen = b""
while True:
letter = fin.read(1)
adlen += letter
if letter==b"|":
adlen = adlen[:-1]
break
ad = fin.read(int(adlen.decode("utf-8")))
fin.close()
adArea["state"] = "normal"
adArea.delete("1.0",tkinter.END)
adArea.insert("1.0",ad.decode("utf-8"))
adArea["state"] = "disabled"
adLabelString.set("File metadata (read only):")
keepBtn["state"] = "normal"
eraseBtn["state"] = "disabled"
else:
eraseBtn["state"] = "normal"
keepBtn["state"] = "disabled"
adArea["state"] = "normal"
adArea.delete("1.0",tkinter.END)
suffix = " (will be encrypted)"
adLabelString.set(adString)
inputString.set(inputFile.split("/")[-1]+suffix)
passwordInput["state"] = "normal"
passwordInput.delete(0,"end")
startBtn["state"] = "normal"
statusString.set("Ready.")
progress["value"] = 0
except UnicodeDecodeError:
passwordInput["state"] = "normal"
passwordInput.delete(0,"end")
statusString.set(corruptedNotice)
except:
pass
finally:
dummy.focus()
working = False
# Try to handle when select file is cancelled
try:
# Ask for input file
suffix = ""
tmp = filedialog.askopenfilename(
initialdir=expanduser("~")
)
if len(tmp)==0:
# Exception will be caught by except below
raise Exception("No file selected.")
inputFile = tmp
# Decide if encrypting or decrypting
if ".pcf" in inputFile.split("/")[-1]:
suffix = " (will be decrypted)"
fin = open(inputFile,"rb+")
# Read file metadata
adlen = b""
while True:
letter = fin.read(1)
adlen += letter
if letter==b"|":
adlen = adlen[:-1]
break
ad = fin.read(int(adlen.decode("utf-8")))
fin.close()
# Insert the metadata into its text box
adArea["state"] = "normal"
adArea.delete("1.0",tkinter.END)
adArea.insert("1.0",ad.decode("utf-8"))
adArea["state"] = "disabled"
adLabelString.set("File metadata (read only):")
keepBtn["state"] = "normal"
eraseBtn["state"] = "disabled"
else:
# Update the UI
eraseBtn["state"] = "normal"
keepBtn["state"] = "disabled"
adArea["state"] = "normal"
adArea.delete("1.0",tkinter.END)
suffix = " (will be encrypted)"
adLabelString.set(adString)
# Enable password box, etc.
inputString.set(inputFile.split("/")[-1]+suffix)
passwordInput["state"] = "normal"
passwordInput.delete(0,"end")
startBtn["state"] = "normal"
statusString.set("Ready.")
progress["value"] = 0
# File decode error
except UnicodeDecodeError:
passwordInput["state"] = "normal"
passwordInput.delete(0,"end")
statusString.set(corruptedNotice)
# No file selected, do nothing
except:
pass
# Focus the dummy button to remove ugly borders
finally:
dummy.focus()
working = False
# Button to select input file
selectFileInput = tkinter.ttk.Button(
tk,
text="Select file",
command=inputSelected,
tk,
text="Select file",
command=inputSelected,
)
selectFileInput.place(x=19,y=20)
# Label that displays selected input file
inputString = tkinter.StringVar(tk)
inputString.set("Please select a file.")
selectedInput = tkinter.ttk.Label(
tk,
textvariable=inputString
tk,
textvariable=inputString
)
selectedInput.config(background="#f5f6f7")
selectedInput.place(x=104,y=23)
# Label that prompts user to enter a password
passwordString = tkinter.StringVar(tk)
passwordString.set("Password:")
passwordLabel = tkinter.ttk.Label(
tk,
textvariable=passwordString
tk,
textvariable=passwordString
)
passwordLabel.place(x=17,y=56)
passwordLabel.config(background="#f5f6f7")
# A frame to make password input fill width
passwordFrame = tkinter.Frame(
tk,
width=440,
height=22
tk,
width=440,
height=22
)
passwordFrame.place(x=20,y=76)
passwordFrame.columnconfigure(0,weight=10)
passwordFrame.grid_propagate(False)
# Password input box
passwordInput = tkinter.ttk.Entry(
passwordFrame
passwordFrame
)
passwordInput.grid(sticky="nesw")
passwordInput["state"] = "disabled"
# Start the encryption/decryption process
def start():
global inputFile,outputFile,password,ad,kept,working
global inputFile,outputFile,password,ad,kept,working
if ".pcf" not in inputFile:
mode = "encrypt"
outputFile = inputFile+".pcf"
else:
mode = "decrypt"
outputFile = inputFile[:-4]
try:
getsize(outputFile)
force = messagebox.askyesno("Warning",overwriteNotice)
dummy.focus()
if force!=1:
return
except:
pass
# Decide if encrypting or decrypting
if ".pcf" not in inputFile:
mode = "encrypt"
outputFile = inputFile+".pcf"
else:
mode = "decrypt"
outputFile = inputFile[:-4]
working = True
dummy.focus()
password = passwordInput.get().encode("utf-8")
ad = adArea.get("1.0",tkinter.END).encode("utf-8")
wipe = erase.get()==1
# Check if file already exists
try:
getsize(outputFile)
force = messagebox.askyesno("Warning",overwriteNotice)
dummy.focus()
if force!=1:
return
except:
pass
selectFileInput["state"] = "disabled"
eraseBtn["state"] = "disabled"
passwordInput["state"] = "disabled"
adArea["state"] = "disabled"
startBtn["state"] = "disabled"
keepBtn["state"] = "disabled"
# Set and get some variables
working = True
dummy.focus()
password = passwordInput.get().encode("utf-8")
ad = adArea.get("1.0",tkinter.END).encode("utf-8")
wipe = erase.get()==1
fin = open(inputFile,"rb+")
fout = open(outputFile,"wb+")
selectFileInput["state"] = "disabled"
passwordInput["state"] = "disabled"
adArea["state"] = "disabled"
startBtn["state"] = "disabled"
keepBtn["state"] = "disabled"
if mode=="encrypt":
salt = urandom(16)
nonce = urandom(24)
fout.write(str(len(ad)).encode("utf-8"))
fout.write(b"|")
fout.write(ad)
fout.write(b"0"*64)
fout.write(b"0"*64)
fout.write(b"0"*16)
fout.write(salt)
fout.write(nonce)
else:
adlen = b""
while True:
letter = fin.read(1)
adlen += letter
if letter==b"|":
adlen = adlen[:-1]
break
fin.read(int(adlen.decode("utf-8")))
cs = fin.read(64)
crccs = fin.read(64)
digest = fin.read(16)
salt = fin.read(16)
nonce = fin.read(24)
fin = open(inputFile,"rb+")
fout = open(outputFile,"wb+")
statusString.set(derivingNotice)
# Generate values for encryption if encrypting
if mode=="encrypt":
salt = urandom(16)
nonce = urandom(24)
fout.write(str(len(ad)).encode("utf-8"))
fout.write(b"|")
fout.write(ad)
fout.write(b"0"*64)
fout.write(b"0"*64)
fout.write(b"0"*16)
fout.write(salt)
fout.write(nonce)
# If decrypting, read values from file
else:
# Read past metadata into actual data
while True:
letter = fin.read(1)
if letter==b"|":
break
fin.read(int(adlen.decode("utf-8")))
cs = fin.read(64)
crccs = fin.read(64)
digest = fin.read(16)
salt = fin.read(16)
nonce = fin.read(24)
progress.config(mode="indeterminate")
progress.start(15)
# Show notice, set progress bar indeterminate
statusString.set(derivingNotice)
progress.config(mode="indeterminate")
progress.start(15)
key = hash_secret_raw(
password,
salt,
time_cost=8,
memory_cost=1048576,
parallelism=8,
hash_len=32,
type=Type.ID
)
# Derive argon2id key
key = hash_secret_raw(
password,
salt,
time_cost=8, # 8 iterations
memory_cost=2**20, # 2^20 Kilobytes (1GB)
parallelism=8, # 8 parallel threads
hash_len=32,
type=Type.ID
)
progress.stop()
progress.config(mode="determinate")
progress["value"] = 0
# Key deriving done, set progress bar determinate
progress.stop()
progress.config(mode="determinate")
progress["value"] = 0
check = sha3_512(key).digest()
# Compute hash of derived key
check = sha3_512(key).digest()
if mode=="decrypt":
if not compare_digest(check,cs):
statusString.set(passwordNotice)
fin.close()
fout.close()
remove(outputFile)
selectFileInput["state"] = "normal"
passwordInput["state"] = "normal"
adArea["state"] = "normal"
startBtn["state"] = "normal"
keepBtn["state"] = "normal"
working = False
del key
return
# If decrypting, check if key is correct
if mode=="decrypt":
# If key is incorrect...
if not compare_digest(check,cs):
statusString.set(passwordNotice)
fin.close()
fout.close()
remove(outputFile)
selectFileInput["state"] = "normal"
passwordInput["state"] = "normal"
adArea["state"] = "normal"
startBtn["state"] = "normal"
keepBtn["state"] = "normal"
working = False
del key
return
cipher = ChaCha20_Poly1305.new(key=key,nonce=nonce)
crc = sha3_512()
# Create XChaCha20-Poly1305 object
cipher = ChaCha20_Poly1305.new(key=key,nonce=nonce)
# Cyclic redundancy check for file corruption
crc = sha3_512()
done = 0
total = getsize(inputFile)
chunkSize = 2**20
startTime = datetime.now()
done = 0
total = getsize(inputFile)
chunkSize = 2**20
startTime = datetime.now()
if wipe:
wiper = open(inputFile,"r+b")
wiper.seek(0)
# If secure wipe enabled, create a wiper object
if wipe:
wiper = open(inputFile,"r+b")
wiper.seek(0)
while True:
piece = fin.read(chunkSize)
if wipe:
trash = urandom(len(piece))
wiper.write(trash)
if not piece:
if mode=="encrypt":
digest = cipher.digest()
fout.flush()
fout.close()
fout = open(outputFile,"r+b")
fout.seek(len(str(len(ad)))+1+len(ad))
fout.write(check)
fout.write(crc.digest())
fout.write(digest)
else:
crcdg = crc.digest()
if not compare_digest(crccs,crcdg):
statusString.set(corruptedNotice)
progress["value"] = 100
fin.close()
fout.close()
if keep.get()!=1:
remove(outputFile)
selectFileInput["state"] = "normal"
passwordInput["state"] = "normal"
adArea["state"] = "normal"
startBtn["state"] = "normal"
keepBtn["state"] = "normal"
working = False
del fin,fout,cipher,key
return
else:
kept = "corrupted"
try:
cipher.verify(digest)
except:
statusString.set(modifiedNotice)
progress["value"] = 100
fin.close()
fout.close()
if keep.get()!=1:
remove(outputFile)
selectFileInput["state"] = "normal"
passwordInput["state"] = "normal"
adArea["state"] = "normal"
startBtn["state"] = "normal"
keepBtn["state"] = "normal"
working = False
del fin,fout,cipher,key
return
else:
kept = "modified"
break
if mode=="encrypt":
data = cipher.encrypt(piece)
crc.update(data)
else:
crc.update(piece)
data = cipher.decrypt(piece)
# Continously read file in chunks of 1MB
while True:
piece = fin.read(chunkSize)
if wipe:
# If securely wipe, write random trash
# to original file after reading it
trash = urandom(len(piece))
wiper.write(trash)
# If EOF
if not piece:
if mode=="encrypt":
# Get the cipher MAC tag, write to file
digest = cipher.digest()
fout.flush()
fout.close()
fout = open(outputFile,"r+b")
fout.seek(len(str(len(ad)))+1+len(ad))
fout.write(check)
fout.write(crc.digest())
fout.write(digest)
else:
# If decrypting, verify MAC tag
crcdg = crc.digest()
if not compare_digest(crccs,crcdg):
# File is corrupted
statusString.set(corruptedNotice)
progress["value"] = 100
fin.close()
fout.close()
# If keep file checked...
if keep.get()!=1:
remove(outputFile)
selectFileInput["state"] = "normal"
passwordInput["state"] = "normal"
adArea["state"] = "normal"
startBtn["state"] = "normal"
keepBtn["state"] = "normal"
working = False
del fin,fout,cipher,key
return
else:
kept = "corrupted"
try:
# Throws ValueError if incorrect
cipher.verify(digest)
except:
# File is modified
statusString.set(modifiedNotice)
progress["value"] = 100
fin.close()
fout.close()
# If keep file checked...
if keep.get()!=1:
remove(outputFile)
selectFileInput["state"] = "normal"
passwordInput["state"] = "normal"
adArea["state"] = "normal"
startBtn["state"] = "normal"
keepBtn["state"] = "normal"
working = False
del fin,fout,cipher,key
return
else:
kept = "modified"
break
# Encrypt/decrypt chunk and update CRC
if mode=="encrypt":
data = cipher.encrypt(piece)
crc.update(data)
else:
crc.update(piece)
data = cipher.decrypt(piece)
first = False
elapsed = (datetime.now()-startTime).total_seconds()
if elapsed==0:
elapsed = 0.1**6
percent = done*100/total
progress["value"] = percent
rPercent = round(percent)
speed = (done/elapsed)/10**6
if speed==0:
first = True
speed = 0.1**6
rSpeed = round(speed)
eta = round((total-done)/(speed*10**6))
if first:
statusString.set("...% at ... MB/s (ETA: ...s)")
else:
info = f"{rPercent}% at {rSpeed} MB/s (ETA: {eta}s)"
statusString.set(info)
done += chunkSize
fout.write(data)
# Calculate speed, ETA, etc.
first = False
elapsed = (datetime.now()-startTime).total_seconds()
if elapsed==0:
elapsed = 0.1**6
percent = done*100/total
progress["value"] = percent
rPercent = round(percent)
speed = (done/elapsed)/10**6
if speed==0:
first = True
speed = 0.1**6
rSpeed = round(speed)
eta = round((total-done)/(speed*10**6))
if first:
statusString.set("...% at ... MB/s (ETA: ...s)")
else:
info = f"{rPercent}% at {rSpeed} MB/s (ETA: {eta}s)"
statusString.set(info)
done += chunkSize
fout.write(data)
if not kept:
if mode=="encrypt":
output = inputFile.split("/")[-1]+".pcf"
else:
output = inputFile.split("/")[-1].replace(".pcf","")
statusString.set(f"Completed. (Output: {output})")
else:
if kept=="modified":
statusString.set(kModifiedNotice)
else:
statusString.set(kCorruptedNotice)
selectFileInput["state"] = "normal"
adArea["state"] = "normal"
adArea.delete("1.0",tkinter.END)
adArea["state"] = "disabled"
startBtn["state"] = "disabled"
passwordInput["state"] = "normal"
passwordInput.delete(0,"end")
passwordInput["state"] = "disabled"
progress["value"] = 0
inputString.set("Please select a file.")
keepBtn["state"] = "normal"
keep.set(0)
keepBtn["state"] = "disabled"
eraseBtn["state"] = "normal"
erase.set(0)
eraseBtn["state"] = "disabled"
if not kept:
fout.flush()
fsync(fout.fileno())
fout.close()
fin.close()
if wipe:
wiper.flush()
fsync(wiper.fileno())
wiper.close()
remove(inputFile)
inputFile = ""
outputFile = ""
password = ""
ad = ""
kept = False
working = False
del fin,fout,cipher,key
# Show appropriate notice if file corrupted or modified
if not kept:
if mode=="encrypt":
output = inputFile.split("/")[-1]+".pcf"
else:
output = inputFile.split("/")[-1].replace(".pcf","")
statusString.set(f"Completed. (Output: {output})")
else:
if kept=="modified":
statusString.set(kModifiedNotice)
else:
statusString.set(kCorruptedNotice)
# Reset variables and UI states
selectFileInput["state"] = "normal"
adArea["state"] = "normal"
adArea.delete("1.0",tkinter.END)
adArea["state"] = "disabled"
startBtn["state"] = "disabled"
passwordInput["state"] = "normal"
passwordInput.delete(0,"end")
passwordInput["state"] = "disabled"
progress["value"] = 0
inputString.set("Please select a file.")
keepBtn["state"] = "normal"
keep.set(0)
keepBtn["state"] = "disabled"
eraseBtn["state"] = "normal"
erase.set(0)
eraseBtn["state"] = "disabled"
if not kept:
fout.flush()
fsync(fout.fileno())
fout.close()
fin.close()
if wipe:
# Make sure to flush file
wiper.flush()
fsync(wiper.fileno())
wiper.close()
remove(inputFile)
inputFile = ""
outputFile = ""
password = ""
ad = ""
kept = False
working = False
# Wipe keys for safety
del fin,fout,cipher,key
# Wraps the start() function with error handling
def wrapper():
global working
try:
start()
except:
selectFileInput["state"] = "normal"
passwordInput["state"] = "normal"
adArea["state"] = "normal"
startBtn["state"] = "normal"
keepBtn["state"] = "normal"
statusString.set(unknownErrorNotice)
dummy.focus()
working = False
finally:
sys.exit(0)
def startWorker():
thread = Thread(target=wrapper,daemon=True)
thread.start()
global working
# Try start() and handle errors
try:
start()
except:
selectFileInput["state"] = "normal"
passwordInput["state"] = "normal"
adArea["state"] = "normal"
startBtn["state"] = "normal"
keepBtn["state"] = "normal"
statusString.set(unknownErrorNotice)
dummy.focus()
working = False
finally:
sys.exit(0)
# Encryption/decrypt is done is a separate thread
# so the UI isn't blocked. This is a wrapper
# to spawn a thread and start it.
def startWorker():
thread = Thread(target=wrapper,daemon=True)
thread.start()
# ad stands for "associated data"/metadata
adLabelString = tkinter.StringVar(tk)
adLabelString.set(adString)
adLabel = tkinter.ttk.Label(
tk,
textvariable=adLabelString
tk,
textvariable=adLabelString
)
adLabel.place(x=17,y=108)
adLabel.config(background="#f5f6f7")
# Frame so metadata text box can fill width
adFrame = tkinter.Frame(
tk,
width=440,
height=100
tk,
width=440,
height=100
)
adFrame.place(x=20,y=128)
adFrame.columnconfigure(0,weight=10)
adFrame.grid_propagate(False)
# Metadata text box
adArea = tkinter.Text(
adFrame,
exportselection=0
adFrame,
exportselection=0
)
adArea.config(font=("Consolas",12))
adArea.grid(sticky="we")
adArea["state"] = "disabled"
# Check box for keeping corrupted/modified output
keep = tkinter.IntVar()
keepBtn = tkinter.ttk.Checkbutton(
tk,
text=keepNotice,
variable=keep,
onvalue=1,
offvalue=0,
command=lambda:dummy.focus()
tk,
text=keepNotice,
variable=keep,
onvalue=1,
offvalue=0,
command=lambda:dummy.focus()
)
keepBtn.place(x=18,y=240)
keepBtn["state"] = "disabled"
# Check box for securely erasing original file
erase = tkinter.IntVar()
eraseBtn = tkinter.ttk.Checkbutton(
tk,
text=eraseNotice,
variable=erase,
onvalue=1,
offvalue=0,
command=lambda:dummy.focus()
tk,
text=eraseNotice,
variable=erase,
onvalue=1,
offvalue=0,
command=lambda:dummy.focus()
)
eraseBtn.place(x=18,y=260)
eraseBtn["state"] = "disabled"
# Frame so start button can fill width
startFrame = tkinter.Frame(
tk,
width=442,
height=25
tk,
width=442,
height=25
)
startFrame.place(x=19,y=290)
startFrame.columnconfigure(0,weight=10)
startFrame.grid_propagate(False)
# Start button
startBtn = tkinter.ttk.Button(
startFrame,
text="Start",
command=startWorker
startFrame,
text="Start",
command=startWorker
)
startBtn.grid(sticky="nesw")
startBtn["state"] = "disabled"
# Progress bar
progress = tkinter.ttk.Progressbar(
tk,
orient=tkinter.HORIZONTAL,
length=440,
mode="determinate"
tk,
orient=tkinter.HORIZONTAL,
length=440,
mode="determinate"
)
progress.place(x=20,y=328)
# Status label
statusString = tkinter.StringVar(tk)
statusString.set("Ready.")
status = tkinter.ttk.Label(
tk,
textvariable=statusString
tk,
textvariable=statusString
)
status.place(x=17,y=356)
status.config(background="#f5f6f7")
# Credits :)
hint = "Created by Evan Su. Click for details and source."
creditsString = tkinter.StringVar(tk)
creditsString.set(hint)
credits = tkinter.ttk.Label(
tk,
textvariable=creditsString,
cursor="hand2"
tk,
textvariable=creditsString,
cursor="hand2"
)
credits["state"] = "disabled"
credits.config(background="#f5f6f7")
@ -509,26 +579,31 @@ credits.place(x=17,y=386)
source = "https://github.com/HACKERALERT/Picocrypt"
credits.bind("<Button-1>",lambda e:webbrowser.open(source))
# Version
versionString = tkinter.StringVar(tk)
versionString.set("v1.5")
versionString.set("v1.4")
version = tkinter.ttk.Label(
tk,
textvariable=versionString
tk,
textvariable=versionString
)
version["state"] = "disabled"
version.config(background="#f5f6f7")
version.place(x=436,y=386)
# Dummy button to remove focus from other buttons
# and prevent ugly border highlighting
dummy = tkinter.ttk.Button(
tk
tk
)
dummy.place(x=480,y=0)
# Close window only if not encryption or decrypting
def onClose():
if not working:
tk.destroy()
if not working:
tk.destroy()
# Main tkinter loop
if __name__=="__main__":
tk.protocol("WM_DELETE_WINDOW",onClose)
tk.mainloop()
sys.exit(0)
tk.protocol("WM_DELETE_WINDOW",onClose)
tk.mainloop()
sys.exit(0)