0.16.10

hash.asc

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hwrng.py

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+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+# TFC 0.16.10 || hwrng.py
+
+"""
+Copyright (C) 2013-2016  Markus Ottela
+
+This file is part of TFC.
+
+TFC is free software: you can redistribute it and/or modify it under the terms
+of the GNU General Public License as published by the Free Software Foundation,
+either version 3 of the License, or (at your option) any later version.
+
+TFC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+PARTICULAR PURPOSE. See the GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License along with
+TFC. If not, see <http://www.gnu.org/licenses/>.
+"""
+
+import binascii
+import time
+import sys
+
+try:
+    import RPi.GPIO as GPIO
+except ImportError:
+    GPIO = None
+    pass
+
+
+###############################################################################
+#                                CONFIGURATION                                #
+###############################################################################
+
+sample_delay = 0.1  # Delay in seconds between samples
+
+gpio_port = 4       # RPi's GPIO pin (Broadcom layout) to collect entropy from
+
+
+###############################################################################
+#                                     MAIN                                    #
+###############################################################################
+
+def main():
+    """
+    Load 256 or 512 bits of entropy from HWRNG.
+
+    :return: None
+    """
+
+    GPIO.setmode(GPIO.BCM)
+    GPIO.setup(gpio_port, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
+
+    ent_size = int(sys.argv[1])
+
+    if ent_size not in [256, 512, 768]:
+        print('S')
+        exit()
+
+    init0 = 0
+    init1 = 0
+    vnd = ''
+
+    while init0 < 1500 or init1 < 1500:
+        time.sleep(0.001)
+
+        if GPIO.input(gpio_port) == 1:
+            init1 += 1
+        else:
+            init0 += 1
+
+    while len(vnd) != ent_size:
+
+        # Perform Von Neumann whitening during sampling
+        first_bit = GPIO.input(gpio_port)
+        time.sleep(sample_delay)
+
+        second_bit = GPIO.input(gpio_port)
+        time.sleep(sample_delay)
+
+        if first_bit == second_bit:
+            continue
+        else:
+            vnd += str(first_bit)
+            sys.stdout.flush()
+            sys.stdout.write("N\n")
+
+    # Convert bits to byte string
+    ent = ''.join(chr(int(vnd[i:i + 8], 2)) for i in range(0, len(vnd), 8))
+
+    if len(ent) != ent_size / 8:
+        print('L')
+
+    GPIO.cleanup()
+    print(binascii.hexlify(ent))
+
+if __name__ == "__main__":
+    main()