Ring oscillator noise source class

libraries/Crypto/RingOscillatorNoiseSource.cpp

@@ -0,0 +1,263 @@
+/*
+ * Copyright (C) 2015 Southern Storm Software, Pty Ltd.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include "RingOscillatorNoiseSource.h"
+#include "Crypto.h"
+#include "RNG.h"
+#include <Arduino.h>
+
+/**
+ * \class RingOscillatorNoiseSource RingOscillatorNoiseSource.h <RingOscillatorNoiseSource.h>
+ * \brief Processes the signal from a ring oscillator based noise source.
+ *
+ * This class processes input from a ring oscillator noise source, such as
+ * that described \ref crypto_rng_ring "here".
+ *
+ * \note The output from a ring oscillator is not generally as good as a
+ * "true" noise source.  The oscillation can easily settle into regular
+ * patterns or sync up with other clock sources on the board.  It is even
+ * possible to "hack" a ring oscillator by injecting chosen frequencies
+ * on the power supply rails to force the oscillation into a predictable
+ * waveform (see <a href="http://www.cl.cam.ac.uk/~atm26/papers/markettos-ches2009-inject-trng.pdf">this paper</a> for an example).
+ * It is very important that the output of this class be whitened with
+ * \link RNGClass RNG\endlink before it is used for cryptography and that
+ * the device is isolated from attacker-controlled sources of power.
+ * Unless you have a very good reason to use a ring oscillator,
+ * TransistorNoiseSource is usually a better option.
+ *
+ * The noise is read from an input capture pin on the Arduino and stirred
+ * into the random number pool on a regular basis.  The following pins are
+ * used on different Arduino variants:
+ *
+ * <table>
+ * <tr><td>Variant</td><td>Arduino Pin / AVR Pin</td><td>Timer</td></tr>
+ * <tr><td>Arduino Uno</td><td>D8 / PB0</td><td>Timer 1</td></tr>
+ * <tr><td>Arduino Leonardo</td><td>D4 / PD4</td><td>Timer 1</td></tr>
+ * <tr><td>Arduino Mega or Mega 2560</td><td>D49 / PL0</td><td>Timer 4</td></tr>
+ * </table>
+ *
+ * If your board is not pin-compatible with one of the above, then the
+ * source for the RingOscillatorNoiseSource class will need to be modified
+ * to use a different pin/timer combination.  Also, when the timer is in
+ * use by this class it cannot be used for other application tasks.
+ *
+ * The example below shows how to initialize a ring oscillator based noise
+ * source and use it with \link RNGClass RNG\endlink:
+ *
+ * \code
+ * #include <Crypto.h>
+ * #include <RNG.h>
+ * #include <RingOscillatorNoiseSource.h>
+ *
+ * // Noise source to seed the random number generator.
+ * RingOscillatorNoiseSource noise;
+ *
+ * void setup() {
+ *     // Initialize the random number generator with the application tag
+ *     // "MyApp 1.0" and load the previous seed from EEPROM address 500.
+ *     RNG.begin("MyApp 1.0", 500);
+ *
+ *     // ...
+ * }
+ *
+ * void loop() {
+ *     // ...
+ *
+ *     // If the noise source has accumulated new entropy, then stir it in.
+ *     RNG.stir(noise);
+ *
+ *     // Perform regular housekeeping on the random number generator.
+ *     RNG.loop();
+ *
+ *     // ...
+ * }
+ * \endcode
+ *
+ * For more information, see the documentation for \link RNGClass RNG\endlink.
+ *
+ * \sa \link RNGClass RNG\endlink, NoiseSource, TransistorNoiseSource
+ */
+
+// Choose the input capture timer and pin to use for this board.
+#if defined(__AVR_ATmega2560__) || defined(__AVR_ATmega1280__)
+// Arduino Mega or Mega 2560 - input capture on TIMER4 and D49/PL0.
+#define RING_TIMER      4
+#define RING_PIN        49
+#define RING_CAPT_vect  TIMER4_CAPT_vect
+#define RING_ICR        ICR4
+#elif defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega16U4__)
+// Arduino Leonardo - input capture on Timer1 and D4/PD4.
+#define RING_TIMER      1
+#define RING_PIN        4
+#define RING_CAPT_vect  TIMER1_CAPT_vect
+#define RING_ICR        ICR1
+#else
+// Assuming Arduino Uno or equivalent - input capture on TIMER1 and D8/PB0.
+#define RING_TIMER      1
+#define RING_PIN        8
+#define RING_CAPT_vect  TIMER1_CAPT_vect
+#define RING_ICR        ICR1
+#endif
+
+// Calibration states.
+#define NOISE_NOT_CALIBRATING   0
+#define NOISE_CALIBRATING       1
+
+// If there is no capture event for this many milliseconds,
+// then assume that the oscillator is stopped or disconnected.
+#define RING_DISCONNECT_TIME    200
+
+RingOscillatorNoiseSource::RingOscillatorNoiseSource()
+    : calState(NOISE_CALIBRATING)
+    , lastSignal(millis())
+{
+    // Initialize the bit collection routines.
+    restart();
+
+    // Set up the capture pin as an input with no pull-ups.
+    pinMode(RING_PIN, INPUT);
+    digitalWrite(RING_PIN, LOW);
+
+#if RING_TIMER == 1
+    // Set up TIMER1 to perform input capture on PB8/D8.
+    TCCR1B = 0;                 // Turn off TIMER1.
+    TIMSK1 = 0;                 // Turn off TIMER1 interrupts.
+    TCNT1 = 0;                  // Zero the timer.
+    TCCR1A = 0;                 // Turn off output compare.
+    TCCR1B |= (1 << ICES1);     // Input capture on rising edge.
+    TIMSK1 |= (1 << ICIE1);     // Input capture interrupts enabled.
+
+    // Start TIMER1 at the highest frequency with no prescaling.
+    TCCR1B |= (1 << CS10);
+#elif RING_TIMER == 4
+    // Set up TIMER4 to perform input capture on PL0/D49.
+    TCCR4B = 0;                 // Turn off TIMER4.
+    TIMSK4 = 0;                 // Turn off TIMER4 interrupts.
+    TCNT4 = 0;                  // Zero the timer.
+    TCCR4A = 0;                 // Turn off output compare.
+    TCCR4B |= (1 << ICES4);     // Input capture on rising edge.
+    TIMSK4 |= (1 << ICIE4);     // Input capture interrupts enabled.
+
+    // Start TIMER4 at the highest frequency with no prescaling.
+    TCCR4B |= (1 << CS10);
+#endif
+}
+
+RingOscillatorNoiseSource::~RingOscillatorNoiseSource()
+{
+    // Turn off the capture timer.
+#if RING_TIMER == 1
+    TCCR1B = 0;
+#elif RING_TIMER == 4
+    TCCR4B = 0;
+#endif
+
+    // Clean up.
+    clean(buffer);
+}
+
+bool RingOscillatorNoiseSource::calibrating() const
+{
+    return calState == NOISE_CALIBRATING;
+}
+
+static uint16_t volatile out = 0;
+static uint8_t volatile outBits = 0;
+
+// Interrupt service routine for the timer's input capture interrupt.
+ISR(RING_CAPT_vect)
+{
+    // We are interested in the jitter; that is the difference in
+    // time between one rising edge and the next in the signal.
+    // Extract a single bit from the jitter and add it to the
+    // rolling "out" buffer for the main code to process later.
+    // If the buffer overflows, we discard bits and keep going.
+    static uint16_t prev = 0;
+    uint16_t next = RING_ICR;
+    out = (out << 1) | ((next - prev) & 1);
+    prev = next;
+    ++outBits;
+}
+
+void RingOscillatorNoiseSource::stir()
+{
+    // If the "out" buffer is full, then convert the bits.  Turn off
+    // interrupts while we read the "out" buffer and reset "outBits".
+    unsigned long now = millis();
+    cli();
+    if (outBits >= 16) {
+        uint16_t bits = out;
+        outBits = 0;
+        sei();
+        for (uint8_t index = 0; index < 8; ++index) {
+            // Collect two bits of input and remove bias using the Von Neumann
+            // method.  If both bits are the same, then discard both.
+            // Otherwise choose one of the bits and output that one.
+            // We have to do this carefully so that instruction timing does
+            // not reveal the value of the bit that is chosen.
+            if ((bits ^ (bits << 1)) & 0x8000) {
+                // The bits are different: add the top-most to the buffer.
+                if (posn < sizeof(buffer)) {
+                    buffer[posn] = (buffer[posn] >> 1) |
+                                   (((uint8_t)(bits >> 8)) & (uint8_t)0x80);
+                    if (++bitNum >= 8) {
+                        ++posn;
+                        bitNum = 0;
+                    }
+                }
+            }
+            bits = bits << 2;
+        }
+    } else {
+        // The "out" buffer isn't full yet.  Re-enable interrupts.
+        sei();
+
+        // If it has been too long since the last useful block,
+        // then go back to calibrating.  The oscillator may be
+        // stopped or disconnected.
+        if (calState == NOISE_NOT_CALIBRATING) {
+            if ((now - lastSignal) >= RING_DISCONNECT_TIME) {
+                restart();
+                calState = NOISE_CALIBRATING;
+            }
+        }
+    }
+
+    // If the buffer is full, then stir it into the random number pool.
+    // We credit 1 bit of entropy for every 8 bits of output because
+    // ring oscillators aren't quite as good as a true noise source.
+    // We have to collect a lot more data to get something random enough.
+    if (posn >= sizeof(buffer)) {
+        output(buffer, posn, posn);
+        restart();
+        calState = NOISE_NOT_CALIBRATING;
+        lastSignal = now;
+    }
+}
+
+void RingOscillatorNoiseSource::restart()
+{
+    clean(buffer);
+    prevBit = 0;
+    posn = 0;
+    bitNum = 0;
+}

libraries/Crypto/RingOscillatorNoiseSource.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2015 Southern Storm Software, Pty Ltd.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef CRYPTO_RINGOSCILLATORNOISESOURCE_H
+#define CRYPTO_RINGOSCILLATORNOISESOURCE_H
+
+#include <inttypes.h>
+#include "NoiseSource.h"
+
+class RingOscillatorNoiseSource : public NoiseSource
+{
+public:
+    RingOscillatorNoiseSource();
+    virtual ~RingOscillatorNoiseSource();
+
+    bool calibrating() const;
+
+    void stir();
+
+private:
+    uint8_t prevBit;
+    uint8_t posn;
+    uint8_t bitNum;
+    uint8_t calState;
+    uint8_t buffer[32];
+    unsigned long lastSignal;
+
+    void restart();
+};
+
+#endif

libraries/Crypto/TransistorNoiseSource.cpp

@@ -72,7 +72,7 @@
  * }
  * \endcode
  *
- * \sa \link RNGClass RNG\endlink, NoiseSource
+ * \sa \link RNGClass RNG\endlink, NoiseSource, RingOscillatorNoiseSource
  */
 
 /*

libraries/Crypto/examples/TestRNG/TestRNG.ino

@@ -4,6 +4,7 @@
 #include <Crypto.h>
 #include <RNG.h>
 #include <TransistorNoiseSource.h>
+#include <RingOscillatorNoiseSource.h>
 
 // Change "MyApp 1.0" to some other tag for your application
 // so that different applications will generate different results
@@ -15,6 +16,7 @@
 
 // Noise source to seed the random number generator.
 TransistorNoiseSource noise(A1);
+//RingOscillatorNoiseSource noise;
 
 bool calibrating = false;
 byte data[32];

libraries/Crypto/examples/TestRingOscillatorNoise/TestRingOscillatorNoise.ino

@@ -0,0 +1,44 @@
+
+// This example dumps the raw data from a ring oscillator noise source
+// without any of the whitening normally performed by the RNG class.
+
+#include <Crypto.h>
+#include <RingOscillatorNoiseSource.h>
+
+char const hexchars[] = "0123456789ABCDEF";
+
+class RawNoiseSource : public RingOscillatorNoiseSource
+{
+public:
+    RawNoiseSource() : RingOscillatorNoiseSource() {}
+
+protected:
+    void output(const uint8_t *data, size_t len, unsigned int credit)
+    {
+        for (size_t posn = 0; posn < len; ++posn) {
+            uint8_t value = data[posn];
+            Serial.print(hexchars[(value >> 4) & 0x0F]);
+            Serial.print(hexchars[value & 0x0F]);
+        }
+        Serial.println();
+    }
+};
+
+RawNoiseSource noise;
+bool calibrating = true;
+
+void setup() {
+    Serial.begin(9600);
+    Serial.println();
+    Serial.println("calibrating");
+}
+
+void loop() {
+    noise.stir();
+    bool nowCalibrating = noise.calibrating();
+    if (nowCalibrating != calibrating) {
+        calibrating = nowCalibrating;
+        if (calibrating)
+            Serial.println("calibrating");
+    }
+}

libraries/Crypto/keywords.txt

@@ -17,6 +17,7 @@ CFB	KEYWORD1
 CTR	KEYWORD1
 OFB	KEYWORD1
 
+RingOscillatorNoiseSource	KEYWORD1
 RNG	KEYWORD1
 TransistorNoiseSource	KEYWORD1
 

libraries/Crypto/ring_oscillator.fig

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+-6
+6 10035 3330 12600 4905
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+6 10485 4635 10665 4905
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+	 10525 4860 10625 4860
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
+	 10485 4815 10665 4815
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
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+-6
+6 10530 3780 10620 3870
+1 3 0 1 0 -1 0 0 20 0.000 1 0.0000 10575 3825 30 30 10575 3825 10575 3855
+-6
+6 10530 4230 10620 4320
+1 3 0 1 0 -1 0 0 20 0.000 1 0.0000 10575 4275 30 30 10575 4275 10575 4305
+-6
+1 3 0 1 0 7 0 0 -1 0.000 1 0.0000 11970 4275 45 45 11970 4275 12015 4275
+2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
+	 11025 3375 11925 3375 11925 4500 11025 4500 11025 3375
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 3
+	 11025 4185 11115 4275 11025 4365
+2 1 0 1 0 0 20 0 -1 0.000 0 0 0 0 0 2
+	 11865 4230 11790 4230
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 3
+	 11025 3600 10575 3600 10575 4635
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
+	 11025 3825 10575 3825
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
+	 11025 4275 10575 4275
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
+	 11925 3600 12285 3600
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
+	 12015 4275 12285 4275
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
+	 11025 4050 10620 4050
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 1 0 3
+	1 1 1.00 60.00 120.00
+	 10530 4050 10125 4050 10125 3600
+4 0 0 20 -1 16 6 0.0000 4 75 90 11790 3645 Q\001
+4 0 0 20 -1 16 6 0.0000 4 75 90 11790 4320 Q\001
+4 0 0 20 -1 16 6 0.0000 4 75 360 11070 4095 RESET\001
+4 0 0 20 -1 16 6 0.0000 4 75 210 11070 3870 SET\001
+4 0 0 20 -1 16 6 0.0000 4 75 75 11070 3645 D\001
+4 0 0 20 -1 16 6 0.0000 4 75 210 11160 4320 CLK\001
+4 0 0 0 -1 16 6 0.0000 4 75 120 11970 3555 13\001
+4 0 0 0 -1 16 6 0.0000 4 75 120 11970 4185 12\001
+4 0 0 0 -1 16 6 0.0000 4 75 60 10935 3555 9\001
+4 0 0 0 -1 16 6 0.0000 4 75 120 10890 4230 11\001
+4 0 0 0 -1 16 6 0.0000 4 75 60 10935 3780 8\001
+4 0 0 0 -1 16 6 0.0000 4 75 120 10890 4005 10\001
+4 0 0 50 -1 0 12 0.0000 4 135 240 10035 3465 5V\001
+4 0 0 50 -1 0 12 0.0000 4 135 375 12195 4005 U3B\001
+-6
+6 4500 6030 4680 6300
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
+	 4575 6300 4605 6300
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
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+	 4500 6210 4680 6210
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
+	 4590 6030 4590 6210
+-6
+6 4995 6030 5175 6300
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
+	 5070 6300 5100 6300
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
+	 5035 6255 5135 6255
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
+	 4995 6210 5175 6210
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
+	 5085 6030 5085 6210
+-6
+6 4995 5715 5175 6030
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
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+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
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+	 4995 5895 5175 5895
+-6
+6 3510 5490 3690 5760
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
+	 3585 5760 3615 5760
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
+	 3550 5715 3650 5715
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
+	 3510 5670 3690 5670
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
+	 3600 5490 3600 5670
+-6
+6 7695 2700 8865 3285
+6 7785 2700 8865 3060
+1 3 0 1 0 7 0 0 -1 0.000 1 0.0000 8550 2880 45 45 8550 2880 8550 2925
+2 1 0 1 0 7 0 0 -1 0.000 0 0 -1 0 0 4
+	 8145 2700 8145 3060 8505 2880 8145 2700
+2 1 0 1 0 7 0 0 -1 0.000 0 0 -1 0 0 2
+	 8145 2880 7785 2880
+2 1 0 1 0 7 0 0 -1 0.000 0 0 -1 0 0 2
+	 8595 2880 8865 2880
+4 0 0 0 -1 16 6 0.0000 4 75 60 7920 2835 9\001
+4 0 0 0 -1 16 6 0.0000 4 75 60 8685 2835 8\001
+-6
+6 7695 2880 7875 3150
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
+	 7770 3150 7800 3150
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+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
+	 7785 2880 7785 3060
+-6
+4 0 0 50 -1 0 12 0.0000 4 135 375 8190 3285 U1D\001
+-6
+6 7155 4590 7605 4680
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
+	 7250 4635 7155 4635
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 7
+	 7515 4635 7488 4595 7434 4675 7380 4595 7326 4675 7272 4595
+	 7245 4635
+2 1 0 1 0 -1 0 0 -1 0.000 0 0 -1 0 0 2
+	 7605 4635 7510 4635
+-6
+1 3 0 1 0 7 0 0 -1 0.000 1 0.0000 11070 2250 45 45 11070 2250 11115 2250
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
+	 8865 1575 10125 1575
+2 1 0 1 0 0 0 0 -1 4.000 0 0 0 0 0 2
+	 11385 2250 11115 2250
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 3
+	 10125 1800 9225 1800 9225 2115
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
+	 10125 2025 9225 2025
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 1 0 2
+	1 1 1.00 60.00 120.00
+	 10575 1350 10575 900
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
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+	 10125 1350 11025 1350 11025 2475 10125 2475 10125 1350
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 3
+	 10125 2160 10215 2250 10125 2340
+2 1 0 1 0 0 20 0 -1 0.000 0 0 0 0 0 2
+	 10965 2205 10890 2205
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 4
+	 8865 1575 8865 2250 3465 2250 3465 1575
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 4
+	 1350 1620 1350 1350 2025 1350 2025 1620
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 4
+	 1350 1890 1350 2070 2025 2070 2025 1845
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 1 0 2
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+	 10125 2250 9675 2250 9675 4635 7605 4635
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
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+4 0 0 50 -1 0 12 0.0000 4 135 240 10485 765 5V\001
+4 0 0 20 -1 16 6 0.0000 4 75 90 10890 1620 Q\001
+4 0 0 20 -1 16 6 0.0000 4 75 90 10890 2295 Q\001
+4 0 0 0 -1 16 6 0.0000 4 75 60 11115 1530 1\001
+4 0 0 0 -1 16 6 0.0000 4 75 60 11115 2160 2\001
+4 0 0 0 -1 16 6 0.0000 4 75 60 9990 1530 5\001
+4 0 0 0 -1 16 6 0.0000 4 75 60 9990 2205 3\001
+4 0 0 20 -1 16 6 0.0000 4 75 360 10170 2070 RESET\001
+4 0 0 0 -1 16 6 0.0000 4 75 60 9990 1755 6\001
+4 0 0 0 -1 16 6 0.0000 4 75 60 9990 1980 4\001
+4 0 0 20 -1 16 6 0.0000 4 75 210 10170 1845 SET\001
+4 0 0 20 -1 16 6 0.0000 4 75 75 10170 1620 D\001
+4 0 0 20 -1 16 6 0.0000 4 75 210 10260 2295 CLK\001
+4 0 0 10 -1 16 6 0.0000 4 75 60 10665 2610 7\001
+4 0 0 7 -1 16 6 0.0000 4 75 120 10620 1260 14\001
+4 0 0 50 -1 0 12 0.0000 4 135 375 11295 1980 U3A\001
+4 0 0 7 -1 16 6 0.0000 4 75 195 10485 1485 Vdd\001
+4 0 0 10 -1 16 6 0.0000 4 75 195 10485 2430 Vss\001
+4 0 0 50 -1 0 12 0.0000 4 135 240 1620 855 5V\001
+4 0 0 50 -1 0 12 0.0000 4 135 525 2205 1800 100nF\001
+4 0 0 50 -1 0 12 0.0000 4 135 420 720 1800 10uF\001
+4 0 0 50 -1 0 12 0.0000 4 135 2070 5130 2655 4069 CMOS Hex Inverter\001
+4 0 0 0 -1 16 6 0.0000 4 75 60 4635 3780 4\001
+4 0 0 10 -1 16 6 0.0000 4 75 60 5130 3780 8\001
+4 0 0 50 -1 0 12 0.0000 4 135 240 4725 4635 U2\001
+4 0 0 50 -1 0 12 0.0000 4 135 240 3510 2790 5V\001
+4 0 0 0 -1 16 6 0.0000 4 75 60 4140 4185 7\001
+4 0 0 0 -1 16 6 0.0000 4 75 60 4140 4590 6\001
+4 0 0 0 -1 16 6 0.0000 4 75 60 4140 4905 2\001
+4 0 0 7 -1 16 6 0.0000 4 75 60 4635 5535 1\001
+4 0 0 0 -1 16 6 0.0000 4 75 60 5130 5535 5\001
+4 0 0 50 -1 0 12 0.0000 4 135 1845 5670 5130 LM7555 CMOS Timer\001
+4 0 0 50 -1 0 12 0.0000 4 180 1845 11025 2970 4013 Dual D Flip-Flop\001
+4 0 0 50 -1 0 12 0.0000 4 135 420 5265 5940 10nF\001
+4 0 0 20 -1 16 6 0.0000 4 75 180 4365 4320 DIS\001
+4 0 0 20 -1 16 6 0.0000 4 75 210 4365 4680 THR\001
+4 0 0 20 -1 16 6 0.0000 4 75 255 4365 4995 TRIG\001
+4 0 0 20 -1 16 6 0.0000 4 75 270 4950 5310 CTRL\001
+4 0 0 20 -1 16 6 0.0000 4 75 240 4455 5310 GND\001
+4 0 0 20 -1 16 6 0.0000 4 75 360 4410 4005 RESET\001
+4 0 0 20 -1 16 6 0.0000 4 75 195 4995 4005 Vcc\001
+4 0 0 0 -1 16 6 0.0000 4 75 60 5490 4545 3\001
+4 0 0 20 -1 16 6 0.0000 4 75 225 5130 4680 OUT\001
+4 0 0 50 -1 0 12 0.0000 4 180 570 12105 1620 Output\001
+4 0 0 50 -1 0 12 0.0000 4 135 315 3105 5400 1nF\001
+4 0 0 50 -1 0 12 0.0000 4 135 390 3060 4680 1.2K\001
+4 0 0 50 -1 0 12 0.0000 4 135 240 3150 4005 R1\001
+4 0 0 50 -1 0 12 0.0000 4 135 1890 945 3870 Choose R1 for between\001
+4 0 0 50 -1 0 12 0.0000 4 135 345 7200 4500 56R\001
+4 0 0 50 -1 0 12 0.0000 4 180 1980 900 4140 100 and 200 kHz output\001
+4 0 0 50 -1 0 12 0.0000 4 135 660 1485 4410 from U2\001
+4 0 0 50 -1 0 12 0.0000 4 180 3315 8280 5895 Place U1 and U2 on opposite sides of the\001
+4 0 0 50 -1 0 12 0.0000 4 180 3540 8280 6120 PCB layout to avoid the regular signal from\001
+# or
+4 0 0 50 -1 0 12 0.0000 4 180 3465 8280 6345 U2 affecting the ring oscillator's behaviour\001

libraries/Crypto/ring_oscillator_basic.fig

@@ -0,0 +1,39 @@
+#FIG 3.2  Produced by xfig version 3.2.5c
+Landscape
+Center
+Metric
+A4      
+100.00
+Single
+-2
+1200 2
+6 7155 1710 7245 1800
+1 3 0 1 0 -1 0 0 20 0.000 1 0.0000 7200 1755 30 30 7200 1755 7200 1785
+-6
+1 3 0 1 0 7 0 0 -1 0.000 1 0.0000 4590 1755 45 45 4590 1755 4635 1755
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+1 3 0 1 0 7 0 0 -1 0.000 1 0.0000 6840 1755 45 45 6840 1755 6885 1755
+2 1 0 1 0 7 0 0 -1 0.000 0 0 -1 0 0 2
+	 4185 1755 3825 1755
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+	 4635 1755 4950 1755
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+	 4185 1575 4185 1935 4545 1755 4185 1575
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+	 5310 1755 4950 1755
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+2 1 0 1 0 7 0 0 -1 0.000 0 0 -1 0 0 2
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+	 6435 1575 6435 1935 6795 1755 6435 1575
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 1 0 2
+	1 1 1.00 60.00 120.00
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+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 4
+	 7200 1755 7200 1350 3825 1350 3825 1755
+4 0 0 50 -1 0 12 0.0000 4 180 570 8010 1800 Output\001

libraries/Crypto/ring_oscillator_multi.fig

@@ -0,0 +1,146 @@
+#FIG 3.2  Produced by xfig version 3.2.5c
+Landscape
+Center
+Metric
+A4      
+100.00
+Single
+-2
+1200 2
+5 1 0 1 0 7 0 0 -1 0.000 0 0 0 0 5671.500 1807.500 6221 1515 6294 1808 6221 2100
+5 1 0 1 0 7 0 0 -1 0.000 0 0 0 0 5532.919 1807.500 6074 1515 6148 1808 6074 2100
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+	 0.000 -1.000 0.000
+4 0 0 50 -1 0 12 0.0000 4 135 135 7920 1845 D\001
+4 0 0 50 -1 0 12 0.0000 4 165 135 8595 1845 Q\001
+4 0 0 50 -1 0 12 0.0000 4 135 390 8010 2520 CLK\001
+4 0 0 50 -1 0 12 0.0000 4 180 570 9540 1845 Output\001
+4 0 0 50 -1 0 12 0.0000 4 180 1320 6435 3375 Sampling Clock\001

libraries/Crypto/ring_oscillator_sampled.fig

@@ -0,0 +1,54 @@
+#FIG 3.2  Produced by xfig version 3.2.5c
+Landscape
+Center
+Metric
+A4      
+100.00
+Single
+-2
+1200 2
+6 3825 1395 7875 1980
+6 7155 1755 7245 1845
+1 3 0 1 0 -1 0 0 20 0.000 1 0.0000 7200 1800 30 30 7200 1800 7200 1830
+-6
+1 3 0 1 0 7 0 0 -1 0.000 1 0.0000 4590 1800 45 45 4590 1800 4635 1800
+1 3 0 1 0 7 0 0 -1 0.000 1 0.0000 5715 1800 45 45 5715 1800 5760 1800
+1 3 0 1 0 7 0 0 -1 0.000 1 0.0000 6840 1800 45 45 6840 1800 6885 1800
+2 1 0 1 0 7 0 0 -1 0.000 0 0 -1 0 0 2
+	 4185 1800 3825 1800
+2 1 0 1 0 7 0 0 -1 0.000 0 0 -1 0 0 2
+	 4635 1800 4950 1800
+2 1 0 1 0 7 0 0 -1 0.000 0 0 -1 0 0 4
+	 4185 1620 4185 1980 4545 1800 4185 1620
+2 1 0 1 0 7 0 0 -1 0.000 0 0 -1 0 0 2
+	 5310 1800 4950 1800
+2 1 0 1 0 7 0 0 -1 0.000 0 0 -1 0 0 2
+	 5760 1800 6075 1800
+2 1 0 1 0 7 0 0 -1 0.000 0 0 -1 0 0 4
+	 5310 1620 5310 1980 5670 1800 5310 1620
+2 1 0 1 0 7 0 0 -1 0.000 0 0 -1 0 0 2
+	 6435 1800 6075 1800
+2 1 0 1 0 7 0 0 -1 0.000 0 0 -1 0 0 2
+	 6885 1800 7200 1800
+2 1 0 1 0 7 0 0 -1 0.000 0 0 -1 0 0 4
+	 6435 1620 6435 1980 6795 1800 6435 1620
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 4
+	 7200 1800 7200 1395 3825 1395 3825 1800
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 2
+	 7200 1800 7875 1800
+-6
+2 2 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 5
+	 7875 1575 8775 1575 8775 2700 7875 2700 7875 1575
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 0 3
+	 7875 2385 7965 2475 7875 2565
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 1 0 2
+	1 1 1.00 60.00 120.00
+	 8775 1800 9450 1800
+2 1 0 1 0 7 50 -1 -1 0.000 0 0 -1 0 1 3
+	8 1 1.00 60.00 120.00
+	 6975 3150 6975 2475 7875 2475
+4 0 0 50 -1 0 12 0.0000 4 135 135 7920 1845 D\001
+4 0 0 50 -1 0 12 0.0000 4 165 135 8595 1845 Q\001
+4 0 0 50 -1 0 12 0.0000 4 135 390 8010 2520 CLK\001
+4 0 0 50 -1 0 12 0.0000 4 180 570 9540 1845 Output\001
+4 0 0 50 -1 0 12 0.0000 4 180 1320 6435 3375 Sampling Clock\001