Initial verion.
This commit is contained in:
Aaron D. Lee
602
app.py
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602
app.py
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@@ -0,0 +1,602 @@
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#!/usr/bin/env python3
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"""
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Steganography Web Service v3.1
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Flask + Bootstrap web UI for the hybrid Photo + Day-Phrase + PIN system
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"""
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import os
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import io
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import secrets
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import hashlib
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import struct
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from datetime import datetime
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from flask import Flask, render_template, request, send_file, jsonify, flash, redirect, url_for
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from werkzeug.utils import secure_filename
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from PIL import Image
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from secureDeleter import SecureDeleter
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from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
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from cryptography.hazmat.backends import default_backend
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try:
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from argon2.low_level import hash_secret_raw, Type
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HAS_ARGON2 = True
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except ImportError:
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HAS_ARGON2 = False
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from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
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from cryptography.hazmat.primitives import hashes
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# ============================================================================
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# FLASK APP CONFIGURATION
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# ============================================================================
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app = Flask(__name__)
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app.secret_key = secrets.token_hex(32)
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app.config['MAX_CONTENT_LENGTH'] = 5 * 1024 * 1024 # 5MB max upload per file
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app.config['UPLOAD_FOLDER'] = '/tmp/stego_uploads'
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# Limits
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MAX_IMAGE_PIXELS = 4000000 # 4 megapixels max (e.g., 2000x2000)
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MAX_MESSAGE_SIZE = 50000 # 50KB message max
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os.makedirs(app.config['UPLOAD_FOLDER'], exist_ok=True)
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ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'bmp', 'gif'}
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# ============================================================================
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# CRYPTO CONFIGURATION
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# ============================================================================
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MAGIC_HEADER = b'\x89ST3'
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VERSION = 3
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SALT_SIZE = 32
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IV_SIZE = 12
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TAG_SIZE = 16
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ARGON2_TIME_COST = 4
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ARGON2_MEMORY_COST = 256 * 1024
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ARGON2_PARALLELISM = 4
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DAY_NAMES = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
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# BIP-39 wordlist (loaded from file)
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BIP39_FILE = os.path.join(os.path.dirname(__file__), 'bip39-words.txt')
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with open(BIP39_FILE, 'r') as f:
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BIP39_WORDS = [line.strip() for line in f if line.strip()]
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# ============================================================================
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# SECURE CLEANUP
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# ============================================================================
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def secure_cleanup_uploads():
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"""Securely delete any stray files in uploads directory."""
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upload_dir = app.config['UPLOAD_FOLDER']
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if os.path.exists(upload_dir):
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for filename in os.listdir(upload_dir):
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filepath = os.path.join(upload_dir, filename)
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if os.path.isfile(filepath) and not filename.startswith('.'):
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try:
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deleter = SecureDeleter(filepath)
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deleter.execute()
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except Exception as e:
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# Fallback to regular delete
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os.remove(filepath)
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# ============================================================================
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# HELPER FUNCTIONS
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# ============================================================================
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def allowed_file(filename):
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return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS
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def generate_pin(length=6):
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"""Generate a random PIN of specified length (6-8 digits)."""
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return ''.join(str(secrets.randbelow(10)) for _ in range(length))
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def generate_day_phrases(words_per_phrase=3):
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phrases = {}
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for day in DAY_NAMES:
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words = [secrets.choice(BIP39_WORDS) for _ in range(words_per_phrase)]
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phrases[day] = ' '.join(words)
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return phrases
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def hash_photo(image_data):
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"""Compute deterministic hash of photo content."""
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img = Image.open(io.BytesIO(image_data))
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img = img.convert('RGB')
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pixels = img.tobytes()
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h = hashlib.sha256(pixels).digest()
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h = hashlib.sha256(h + pixels[:1024]).digest()
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return h
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def derive_hybrid_key(photo_data, day_phrase, date_str, salt, pin=""):
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"""Derive encryption key from photo + phrase + PIN + date + salt."""
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photo_hash = hash_photo(photo_data)
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key_material = (
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photo_hash +
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day_phrase.lower().encode() +
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pin.encode() +
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date_str.encode() +
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salt
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)
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if HAS_ARGON2:
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key = hash_secret_raw(
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secret=key_material,
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salt=salt[:32],
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time_cost=ARGON2_TIME_COST,
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memory_cost=ARGON2_MEMORY_COST,
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parallelism=ARGON2_PARALLELISM,
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hash_len=32,
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type=Type.ID
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)
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else:
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kdf = PBKDF2HMAC(
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algorithm=hashes.SHA512(),
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length=32,
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salt=salt,
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iterations=600000,
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backend=default_backend()
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)
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key = kdf.derive(key_material)
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return key
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def derive_pixel_key(photo_data, day_phrase, date_str, pin=""):
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"""Derive key for pixel selection."""
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photo_hash = hash_photo(photo_data)
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material = photo_hash + day_phrase.lower().encode() + pin.encode() + date_str.encode()
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return hashlib.sha256(material + b"pixel_selection").digest()
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def encrypt_message(message, photo_data, day_phrase, date_str, pin=""):
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"""Encrypt message using hybrid key derivation."""
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salt = secrets.token_bytes(SALT_SIZE)
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key = derive_hybrid_key(photo_data, day_phrase, date_str, salt, pin)
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iv = secrets.token_bytes(IV_SIZE)
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# Random padding
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if isinstance(message, str):
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message = message.encode()
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padding_len = secrets.randbelow(256) + 64
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padded_len = ((len(message) + padding_len + 255) // 256) * 256
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padding_needed = padded_len - len(message)
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padding = secrets.token_bytes(padding_needed - 4) + struct.pack('>I', len(message))
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padded_message = message + padding
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cipher = Cipher(algorithms.AES(key), modes.GCM(iv), backend=default_backend())
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encryptor = cipher.encryptor()
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encryptor.authenticate_additional_data(MAGIC_HEADER + bytes([VERSION]))
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ciphertext = encryptor.update(padded_message) + encryptor.finalize()
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date_bytes = date_str.encode()
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return (
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MAGIC_HEADER +
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bytes([VERSION]) +
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bytes([len(date_bytes)]) +
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date_bytes +
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salt +
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iv +
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encryptor.tag +
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ciphertext
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)
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def generate_pixel_indices(key, num_pixels, num_needed):
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"""
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Generate pseudo-random pixel indices.
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Optimized: Instead of shuffling ALL pixels (slow for large images),
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we generate indices directly using PRNG and handle collisions.
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"""
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if num_needed >= num_pixels // 2:
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# If we need many pixels, fall back to shuffle (rare case)
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nonce = b'\x00' * 16
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cipher = Cipher(algorithms.ChaCha20(key, nonce), mode=None, backend=default_backend())
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encryptor = cipher.encryptor()
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indices = list(range(num_pixels))
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random_bytes = encryptor.update(b'\x00' * (num_pixels * 4))
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for i in range(num_pixels - 1, 0, -1):
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j_bytes = random_bytes[(num_pixels - 1 - i) * 4:(num_pixels - i) * 4]
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j = int.from_bytes(j_bytes, 'big') % (i + 1)
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indices[i], indices[j] = indices[j], indices[i]
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return indices[:num_needed]
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# Optimized path: generate indices directly
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# Use key to seed selection, ensuring deterministic results
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selected = []
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used = set()
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# Generate random bytes for index selection
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nonce = b'\x00' * 16
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cipher = Cipher(algorithms.ChaCha20(key, nonce), mode=None, backend=default_backend())
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encryptor = cipher.encryptor()
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# Generate more than needed to handle collisions
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bytes_needed = (num_needed * 2) * 4 # 4 bytes per index, 2x for collisions
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random_bytes = encryptor.update(b'\x00' * bytes_needed)
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byte_offset = 0
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while len(selected) < num_needed and byte_offset < len(random_bytes) - 4:
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idx = int.from_bytes(random_bytes[byte_offset:byte_offset + 4], 'big') % num_pixels
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byte_offset += 4
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if idx not in used:
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used.add(idx)
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selected.append(idx)
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# If we still need more (very unlikely), generate additional
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while len(selected) < num_needed:
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extra_bytes = encryptor.update(b'\x00' * 4)
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idx = int.from_bytes(extra_bytes, 'big') % num_pixels
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if idx not in used:
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used.add(idx)
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selected.append(idx)
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return selected
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def embed_in_image(carrier_data, encrypted_data, pixel_key, bits_per_channel=1):
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"""Embed encrypted data in carrier image. Returns PNG bytes."""
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img = Image.open(io.BytesIO(carrier_data))
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if img.mode != 'RGB':
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img = img.convert('RGB')
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pixels = list(img.getdata())
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num_pixels = len(pixels)
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bits_per_pixel = 3 * bits_per_channel
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max_bytes = (num_pixels * bits_per_pixel) // 8
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data_with_len = struct.pack('>I', len(encrypted_data)) + encrypted_data
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if len(data_with_len) > max_bytes:
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raise ValueError(f"Carrier too small. Need {len(data_with_len)} bytes, have {max_bytes}")
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binary_data = ''.join(format(b, '08b') for b in data_with_len)
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pixels_needed = (len(binary_data) + bits_per_pixel - 1) // bits_per_pixel
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selected_indices = generate_pixel_indices(pixel_key, num_pixels, pixels_needed)
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new_pixels = list(pixels)
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clear_mask = 0xFF ^ ((1 << bits_per_channel) - 1)
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bit_idx = 0
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for pixel_idx in selected_indices:
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if bit_idx >= len(binary_data):
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break
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r, g, b = new_pixels[pixel_idx]
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for channel_idx, channel_val in enumerate([r, g, b]):
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if bit_idx >= len(binary_data):
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break
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bits = binary_data[bit_idx:bit_idx + bits_per_channel].ljust(bits_per_channel, '0')
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new_val = (channel_val & clear_mask) | int(bits, 2)
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if channel_idx == 0:
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r = new_val
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elif channel_idx == 1:
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g = new_val
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else:
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b = new_val
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bit_idx += bits_per_channel
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new_pixels[pixel_idx] = (r, g, b)
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stego_img = Image.new('RGB', img.size)
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stego_img.putdata(new_pixels)
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output = io.BytesIO()
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stego_img.save(output, 'PNG')
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output.seek(0)
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return output.getvalue(), {
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'pixels_modified': len(selected_indices),
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'total_pixels': num_pixels,
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'capacity_used': len(data_with_len) / max_bytes
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}
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def extract_from_image(image_data, pixel_key, bits_per_channel=1):
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"""Extract hidden data from image."""
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img = Image.open(io.BytesIO(image_data))
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if img.mode != 'RGB':
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img = img.convert('RGB')
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pixels = list(img.getdata())
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num_pixels = len(pixels)
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bits_per_pixel = 3 * bits_per_channel
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# First extract enough to get length
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initial_pixels = (32 + bits_per_pixel - 1) // bits_per_pixel + 10
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initial_indices = generate_pixel_indices(pixel_key, num_pixels, initial_pixels)
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binary_data = ''
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for pixel_idx in initial_indices:
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r, g, b = pixels[pixel_idx]
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for channel in [r, g, b]:
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for bit_pos in range(bits_per_channel - 1, -1, -1):
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binary_data += str((channel >> bit_pos) & 1)
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try:
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length_bits = binary_data[:32]
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data_length = struct.unpack('>I', int(length_bits, 2).to_bytes(4, 'big'))[0]
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except:
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return None
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max_possible = (num_pixels * bits_per_pixel) // 8 - 4
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if data_length > max_possible or data_length < 10:
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return None
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total_bits = (4 + data_length) * 8
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pixels_needed = (total_bits + bits_per_pixel - 1) // bits_per_pixel
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selected_indices = generate_pixel_indices(pixel_key, num_pixels, pixels_needed)
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binary_data = ''
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for pixel_idx in selected_indices:
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r, g, b = pixels[pixel_idx]
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for channel in [r, g, b]:
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for bit_pos in range(bits_per_channel - 1, -1, -1):
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binary_data += str((channel >> bit_pos) & 1)
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data_bits = binary_data[32:32 + (data_length * 8)]
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data_bytes = bytearray()
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for i in range(0, len(data_bits), 8):
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byte_bits = data_bits[i:i+8]
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if len(byte_bits) == 8:
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data_bytes.append(int(byte_bits, 2))
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return bytes(data_bytes)
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def parse_header(encrypted_data):
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"""Parse v3 header."""
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if len(encrypted_data) < 10 or encrypted_data[:4] != MAGIC_HEADER:
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return None
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date_len = encrypted_data[5]
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date_str = encrypted_data[6:6+date_len].decode()
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offset = 6 + date_len
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salt = encrypted_data[offset:offset+SALT_SIZE]
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offset += SALT_SIZE
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iv = encrypted_data[offset:offset+IV_SIZE]
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offset += IV_SIZE
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tag = encrypted_data[offset:offset+TAG_SIZE]
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offset += TAG_SIZE
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ciphertext = encrypted_data[offset:]
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return {'date': date_str, 'salt': salt, 'iv': iv, 'tag': tag, 'ciphertext': ciphertext}
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def decrypt_message(encrypted_data, photo_data, day_phrase, pin=""):
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"""Decrypt message."""
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header = parse_header(encrypted_data)
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if not header:
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return None
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key = derive_hybrid_key(photo_data, day_phrase, header['date'], header['salt'], pin)
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cipher = Cipher(
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algorithms.AES(key),
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modes.GCM(header['iv'], header['tag']),
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backend=default_backend()
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)
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decryptor = cipher.decryptor()
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decryptor.authenticate_additional_data(MAGIC_HEADER + bytes([VERSION]))
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try:
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padded_plaintext = decryptor.update(header['ciphertext']) + decryptor.finalize()
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original_length = struct.unpack('>I', padded_plaintext[-4:])[0]
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return padded_plaintext[:original_length].decode('utf-8')
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except:
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return None
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# ============================================================================
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# FLASK ROUTES
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# ============================================================================
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@app.route('/')
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def index():
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return render_template('index.html')
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@app.route('/generate', methods=['GET', 'POST'])
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def generate():
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if request.method == 'POST':
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words_per_phrase = int(request.form.get('words_per_phrase', 3))
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pin_length = int(request.form.get('pin_length', 6))
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# Clamp values to valid ranges
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words_per_phrase = max(3, min(12, words_per_phrase))
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pin_length = max(6, min(8, pin_length))
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phrases = generate_day_phrases(words_per_phrase)
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pin = generate_pin(pin_length)
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# Calculate entropy
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phrase_entropy = words_per_phrase * 11 # ~11 bits per BIP-39 word
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pin_entropy = int(pin_length * 3.32) # log2(10) ≈ 3.32 bits per digit
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total_entropy = phrase_entropy + pin_entropy
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return render_template('generate.html',
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phrases=phrases,
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pin=pin,
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days=DAY_NAMES,
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generated=True,
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words_per_phrase=words_per_phrase,
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pin_length=pin_length,
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phrase_entropy=phrase_entropy,
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pin_entropy=pin_entropy,
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total_entropy=total_entropy)
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return render_template('generate.html', generated=False)
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@app.route('/encode', methods=['GET', 'POST'])
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def encode():
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# Get day of week
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day_of_week = datetime.now().strftime("%A")
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if request.method == 'POST':
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try:
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# Get files
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ref_photo = request.files.get('reference_photo')
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carrier = request.files.get('carrier')
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if not ref_photo or not carrier:
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flash('Both reference photo and carrier image are required', 'error')
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return render_template('encode.html')
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if not allowed_file(ref_photo.filename) or not allowed_file(carrier.filename):
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flash('Invalid file type. Use PNG, JPG, or BMP', 'error')
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return render_template('encode.html')
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# Get form data
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message = request.form.get('message', '')
|
||||
day_phrase = request.form.get('day_phrase', '')
|
||||
pin = request.form.get('pin', '')
|
||||
|
||||
if not message or not day_phrase:
|
||||
flash('Message and day phrase are required', 'error')
|
||||
return render_template('encode.html')
|
||||
|
||||
# Check message size
|
||||
if len(message) > MAX_MESSAGE_SIZE:
|
||||
flash(f'Message too long. Max {MAX_MESSAGE_SIZE // 1000}KB allowed.', 'error')
|
||||
return render_template('encode.html')
|
||||
|
||||
# Read files
|
||||
ref_data = ref_photo.read()
|
||||
carrier_data = carrier.read()
|
||||
|
||||
# Validate carrier image dimensions
|
||||
try:
|
||||
carrier_img = Image.open(io.BytesIO(carrier_data))
|
||||
width, height = carrier_img.size
|
||||
num_pixels = width * height
|
||||
|
||||
if num_pixels > MAX_IMAGE_PIXELS:
|
||||
max_dim = int(MAX_IMAGE_PIXELS ** 0.5)
|
||||
flash(f'Carrier image too large ({width}x{height} = {num_pixels:,} pixels). '
|
||||
f'Max ~{MAX_IMAGE_PIXELS:,} pixels ({max_dim}x{max_dim}). '
|
||||
f'Please resize your image.', 'error')
|
||||
return render_template('encode.html')
|
||||
except Exception as e:
|
||||
flash(f'Could not read carrier image: {str(e)}', 'error')
|
||||
return render_template('encode.html')
|
||||
|
||||
# Get date
|
||||
date_str = datetime.now().strftime('%Y-%m-%d')
|
||||
|
||||
# Encrypt
|
||||
encrypted = encrypt_message(message, ref_data, day_phrase, date_str, pin)
|
||||
|
||||
# Get pixel key
|
||||
pixel_key = derive_pixel_key(ref_data, day_phrase, date_str, pin)
|
||||
|
||||
# Embed
|
||||
stego_data, stats = embed_in_image(carrier_data, encrypted, pixel_key)
|
||||
|
||||
# Return as download
|
||||
return send_file(
|
||||
io.BytesIO(stego_data),
|
||||
mimetype='image/png',
|
||||
as_attachment=True,
|
||||
#download_name='stego_image.png'
|
||||
download_name=f'{secrets.token_hex(4)}_{datetime.now().strftime("%Y%m%d")}.png'
|
||||
)
|
||||
|
||||
except Exception as e:
|
||||
flash(f'Error: {str(e)}', 'error')
|
||||
return render_template('encode.html', day_of_week=day_of_week)
|
||||
|
||||
return render_template('encode.html', day_of_week=day_of_week)
|
||||
|
||||
|
||||
@app.route('/decode', methods=['GET', 'POST'])
|
||||
def decode():
|
||||
if request.method == 'POST':
|
||||
try:
|
||||
# Get files
|
||||
ref_photo = request.files.get('reference_photo')
|
||||
stego_image = request.files.get('stego_image')
|
||||
|
||||
if not ref_photo or not stego_image:
|
||||
flash('Both reference photo and stego image are required', 'error')
|
||||
return render_template('decode.html')
|
||||
|
||||
# Get form data
|
||||
day_phrase = request.form.get('day_phrase', '')
|
||||
pin = request.form.get('pin', '')
|
||||
|
||||
if not day_phrase:
|
||||
flash('Day phrase is required', 'error')
|
||||
return render_template('decode.html')
|
||||
|
||||
# Read files
|
||||
ref_data = ref_photo.read()
|
||||
stego_data = stego_image.read()
|
||||
|
||||
# Try to extract and decrypt
|
||||
# We need to try with today's date first for pixel key
|
||||
date_str = datetime.now().strftime('%Y-%m-%d')
|
||||
pixel_key = derive_pixel_key(ref_data, day_phrase, date_str, pin)
|
||||
|
||||
encrypted = extract_from_image(stego_data, pixel_key)
|
||||
|
||||
if encrypted:
|
||||
# Parse to get actual date
|
||||
header = parse_header(encrypted)
|
||||
if header and header['date'] != date_str:
|
||||
# Re-extract with correct date
|
||||
pixel_key = derive_pixel_key(ref_data, day_phrase, header['date'], pin)
|
||||
encrypted = extract_from_image(stego_data, pixel_key)
|
||||
|
||||
if not encrypted:
|
||||
flash('Could not extract data. Check your inputs.', 'error')
|
||||
return render_template('decode.html')
|
||||
|
||||
message = decrypt_message(encrypted, ref_data, day_phrase, pin)
|
||||
|
||||
if message:
|
||||
return render_template('decode.html', decoded_message=message)
|
||||
else:
|
||||
flash('Decryption failed. Wrong phrase, PIN, or reference photo.', 'error')
|
||||
return render_template('decode.html')
|
||||
|
||||
except Exception as e:
|
||||
flash(f'Error: {str(e)}', 'error')
|
||||
return render_template('decode.html')
|
||||
|
||||
return render_template('decode.html')
|
||||
|
||||
|
||||
@app.route('/about')
|
||||
def about():
|
||||
return render_template('about.html', has_argon2=HAS_ARGON2)
|
||||
|
||||
|
||||
# ============================================================================
|
||||
# MAIN
|
||||
# ============================================================================
|
||||
|
||||
if __name__ == '__main__':
|
||||
app.run(host='0.0.0.0', port=5000, debug=False)
|
||||
Reference in New Issue
Block a user