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Speck block cipher

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This commit is contained in:
Rhys Weatherley 2015-11-30 18:23:21 +10:00
parent 3b4a928457
commit ee43158b64
5 changed files with 404 additions and 2 deletions
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5
doc/crypto.dox
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@ -26,7 +26,7 @@
\section crypto_algorithms Supported Algorithms
\li Block ciphers: AES128, AES192, AES256
\li Block ciphers: AES128, AES192, AES256, Speck
\li Block cipher modes: CTR, CFB, CBC, OFB, GCM
\li Stream ciphers: ChaCha
\li Authenticated encryption with associated data (AEAD): ChaChaPoly, GCM
@ -71,6 +71,9 @@ Ardunino Mega 2560 running at 16 MHz are similar:
<tr><td>ChaCha (20 rounds)</td><td align="right">14.87us</td><td align="right">14.88us</td><td align="right">43.74us</td><td align="right">132</td></tr>
<tr><td>ChaCha (12 rounds)</td><td align="right">10.38us</td><td align="right">10.38us</td><td align="right">43.74us</td><td align="right">132</td></tr>
<tr><td>ChaCha (8 rounds)</td><td align="right">8.13us</td><td align="right">8.14us</td><td align="right">43.74us</td><td align="right">132</td></tr>
<tr><td>Speck (128-bit key)</td><td align="right">N.NNus</td><td align="right">N.NNus</td><td align="right">N.NNus</td><td align="right">275</td></tr>
<tr><td>Speck (192-bit key)</td><td align="right">N.NNus</td><td align="right">N.NNus</td><td align="right">N.NNus</td><td align="right">275</td></tr>
<tr><td>Speck (256-bit key)</td><td align="right">N.NNus</td><td align="right">N.NNus</td><td align="right">N.NNus</td><td align="right">275</td></tr>
<tr><td colspan="5"> </td></tr>
<tr><td>AEAD Algorithm</td><td align="right">Encryption (per byte)</td><td align="right">Decryption (per byte)</td><td>Key Setup</td><td>State Size (bytes)</td></tr>
<tr><td>ChaChaPoly</td><td align="right">41.23us</td><td align="right">41.23us</td><td align="right">902.55us</td><td align="right">255</td></tr>

2
doc/mainpage.dox
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@ -91,7 +91,7 @@ realtime clock and the LCD library to implement an alarm clock.
\section main_Crypto Cryptographic Library
\li Block ciphers: AES128, AES192, AES256
\li Block ciphers: AES128, AES192, AES256, Speck
\li Block cipher modes: CTR, CFB, CBC, OFB, GCM
\li Stream ciphers: ChaCha
\li Authenticated encryption with associated data (AEAD): ChaChaPoly, GCM

184
libraries/Crypto/Speck.cpp Normal file
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/*
* 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 "Speck.h"
#include "Crypto.h"
#include "utility/RotateUtil.h"
#include "utility/EndianUtil.h"
#include <string.h>
/**
* \class Speck Speck.h <Speck.h>
* \brief Speck block cipher with a 128-bit block size.
*
* Speck is a family of lightweight block ciphers designed by the
* National Security Agency (NSA). The ciphers are highly optimized
* for software implementation on microcontrollers.
*
* This class implements the Speck family that uses 128-bit block sizes
* with 128-bit, 192-bit, or 256-bit key sizes. Other Speck families support
* smaller block sizes of 32, 48, 64, or 96 bits but such block sizes are
* really too small for use in modern cryptosystems.
*
* \note Current crytoanalysis (up until 2015) has not revealed any obvious
* weaknesses in the full-round version of Speck. But if you are wary of
* ciphers designed by the NSA, then use ChaCha or AES instead.
*
* References: https://en.wikipedia.org/wiki/Speck_%28cipher%29,
* http://eprint.iacr.org/2013/404
*/
/**
* \brief Constructs a Speck block cipher with no initial key.
*
* This constructor must be followed by a call to setKey() before the
* block cipher can be used for encryption or decryption.
*/
Speck::Speck()
: rounds(32)
{
}
Speck::~Speck()
{
clean(k);
}
size_t Speck::blockSize() const
{
return 16;
}
size_t Speck::keySize() const
{
// Also supports 128-bit and 192-bit, but we only report 256-bit.
return 32;
}
// Pack/unpack big-endian 64-bit quantities.
#if defined(__AVR__)
#define pack64(data, value) \
do { \
const uint8_t *src = (const uint8_t *)&(value); \
(data)[0] = src[7]; \
(data)[1] = src[6]; \
(data)[2] = src[5]; \
(data)[3] = src[4]; \
(data)[4] = src[3]; \
(data)[5] = src[2]; \
(data)[6] = src[1]; \
(data)[7] = src[0]; \
} while (0)
#define unpack64(value, data) \
do { \
uint8_t *dest = (uint8_t *)&(value); \
dest[0] = (data)[7]; \
dest[1] = (data)[6]; \
dest[2] = (data)[5]; \
dest[3] = (data)[4]; \
dest[4] = (data)[3]; \
dest[5] = (data)[2]; \
dest[6] = (data)[1]; \
dest[7] = (data)[0]; \
} while (0)
#else
#define pack64(data, value) \
do { \
uint64_t v = htobe64((value)); \
memcpy((data), &v, sizeof(uint64_t)); \
} while (0)
#define unpack64(value, data) \
do { \
memcpy(&(value), (data), sizeof(uint64_t)); \
(value) = be64toh((value)); \
} while (0)
#endif
bool Speck::setKey(const uint8_t *key, size_t len)
{
uint64_t l[4];
uint8_t m;
if (len == 32) {
m = 4;
unpack64(l[2], key);
unpack64(l[1], key + 8);
unpack64(l[0], key + 16);
unpack64(k[0], key + 24);
} else if (len == 24) {
m = 3;
unpack64(l[1], key);
unpack64(l[0], key + 8);
unpack64(k[0], key + 16);
} else if (len == 16) {
m = 2;
unpack64(l[0], key);
unpack64(k[0], key + 8);
} else {
return false;
}
rounds = 30 + m;
uint8_t li_in = 0;
uint8_t li_out = m - 1;
for (uint8_t i = 0; i < (rounds - 1); ++i) {
l[li_out] = (k[i] + rightRotate8_64(l[li_in])) ^ i;
k[i + 1] = leftRotate3_64(k[i]) ^ l[li_out];
if ((++li_in) >= m)
li_in = 0;
if ((++li_out) >= m)
li_out = 0;
}
clean(l);
return true;
}
void Speck::encryptBlock(uint8_t *output, const uint8_t *input)
{
uint64_t x, y;
const uint64_t *s = k;
unpack64(x, input);
unpack64(y, input + 8);
for (uint8_t round = rounds; round > 0; --round, ++s) {
x = (rightRotate8_64(x) + y) ^ s[0];
y = leftRotate3_64(y) ^ x;
}
pack64(output, x);
pack64(output + 8, y);
}
void Speck::decryptBlock(uint8_t *output, const uint8_t *input)
{
uint64_t x, y;
const uint64_t *s = k + rounds - 1;
unpack64(x, input);
unpack64(y, input + 8);
for (uint8_t round = rounds; round > 0; --round, --s) {
y = rightRotate3_64(x ^ y);
x = leftRotate8_64((x ^ s[0]) - y);
}
pack64(output, x);
pack64(output + 8, y);
}
void Speck::clear()
{
clean(k);
}

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libraries/Crypto/Speck.h Normal file
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@ -0,0 +1,49 @@
/*
* 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_SPECK_H
#define CRYPTO_SPECK_H
#include "BlockCipher.h"
class Speck : public BlockCipher
{
public:
Speck();
virtual ~Speck();
size_t blockSize() const;
size_t keySize() const;
bool setKey(const uint8_t *key, size_t len);
void encryptBlock(uint8_t *output, const uint8_t *input);
void decryptBlock(uint8_t *output, const uint8_t *input);
void clear();
private:
uint64_t k[34];
uint8_t rounds;
};
#endif

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libraries/Crypto/examples/TestSpeck/TestSpeck.ino Normal file
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@ -0,0 +1,166 @@
/*
* 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.
*/
/*
This example runs tests on the Speck implementation to verify correct behaviour.
*/
#include <Crypto.h>
#include <Speck.h>
#include <string.h>
struct TestVector
{
const char *name;
byte key[32];
byte plaintext[16];
byte ciphertext[16];
};
// Define the test vectors from http://eprint.iacr.org/2013/404
static TestVector const testVectorSpeck128 = {
.name = "Speck-128-ECB",
.key = {0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08,
0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00},
.plaintext = {0x6c, 0x61, 0x76, 0x69, 0x75, 0x71, 0x65, 0x20,
0x74, 0x69, 0x20, 0x65, 0x64, 0x61, 0x6d, 0x20},
.ciphertext = {0xa6, 0x5d, 0x98, 0x51, 0x79, 0x78, 0x32, 0x65,
0x78, 0x60, 0xfe, 0xdf, 0x5c, 0x57, 0x0d, 0x18}
};
static TestVector const testVectorSpeck192 = {
.name = "Speck-192-ECB",
.key = {0x17, 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x10,
0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08,
0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00},
.plaintext = {0x72, 0x61, 0x48, 0x20, 0x66, 0x65, 0x69, 0x68,
0x43, 0x20, 0x6f, 0x74, 0x20, 0x74, 0x6e, 0x65},
.ciphertext = {0x1b, 0xe4, 0xcf, 0x3a, 0x13, 0x13, 0x55, 0x66,
0xf9, 0xbc, 0x18, 0x5d, 0xe0, 0x3c, 0x18, 0x86}
};
static TestVector const testVectorSpeck256 = {
.name = "Speck-256-ECB",
.key = {0x1f, 0x1e, 0x1d, 0x1c, 0x1b, 0x1a, 0x19, 0x18,
0x17, 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x10,
0x0f, 0x0e, 0x0d, 0x0c, 0x0b, 0x0a, 0x09, 0x08,
0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00},
.plaintext = {0x65, 0x73, 0x6f, 0x68, 0x74, 0x20, 0x6e, 0x49,
0x20, 0x2e, 0x72, 0x65, 0x6e, 0x6f, 0x6f, 0x70},
.ciphertext = {0x41, 0x09, 0x01, 0x04, 0x05, 0xc0, 0xf5, 0x3e,
0x4e, 0xee, 0xb4, 0x8d, 0x9c, 0x18, 0x8f, 0x43}
};
Speck speck;
byte buffer[16];
void testCipher(BlockCipher *cipher, const struct TestVector *test, size_t keySize)
{
Serial.print(test->name);
Serial.print(" Encryption ... ");
cipher->setKey(test->key, keySize);
cipher->encryptBlock(buffer, test->plaintext);
if (memcmp(buffer, test->ciphertext, 16) == 0)
Serial.println("Passed");
else
Serial.println("Failed");
Serial.print(test->name);
Serial.print(" Decryption ... ");
cipher->decryptBlock(buffer, test->ciphertext);
if (memcmp(buffer, test->plaintext, 16) == 0)
Serial.println("Passed");
else
Serial.println("Failed");
}
void perfCipher(BlockCipher *cipher, const struct TestVector *test, size_t keySize)
{
unsigned long start;
unsigned long elapsed;
int count;
Serial.print(test->name);
Serial.print(" Set Key ... ");
start = micros();
for (count = 0; count < 10000; ++count) {
cipher->setKey(test->key, keySize);
}
elapsed = micros() - start;
Serial.print(elapsed / 10000.0);
Serial.print("us per operation, ");
Serial.print((10000.0 * 1000000.0) / elapsed);
Serial.println(" per second");
Serial.print(test->name);
Serial.print(" Encrypt ... ");
start = micros();
for (count = 0; count < 5000; ++count) {
cipher->encryptBlock(buffer, buffer);
}
elapsed = micros() - start;
Serial.print(elapsed / (5000.0 * 16.0));
Serial.print("us per byte, ");
Serial.print((16.0 * 5000.0 * 1000000.0) / elapsed);
Serial.println(" bytes per second");
Serial.print(test->name);
Serial.print(" Decrypt ... ");
start = micros();
for (count = 0; count < 5000; ++count) {
cipher->decryptBlock(buffer, buffer);
}
elapsed = micros() - start;
Serial.print(elapsed / (5000.0 * 16.0));
Serial.print("us per byte, ");
Serial.print((16.0 * 5000.0 * 1000000.0) / elapsed);
Serial.println(" bytes per second");
Serial.println();
}
void setup()
{
Serial.begin(9600);
Serial.println();
Serial.println("State Sizes:");
Serial.print("Speck ... ");
Serial.println(sizeof(Speck));
Serial.println();
Serial.println("Test Vectors:");
testCipher(&speck, &testVectorSpeck128, 16);
testCipher(&speck, &testVectorSpeck192, 24);
testCipher(&speck, &testVectorSpeck256, 32);
Serial.println();
Serial.println("Performance Tests:");
perfCipher(&speck, &testVectorSpeck128, 16);
perfCipher(&speck, &testVectorSpeck192, 24);
perfCipher(&speck, &testVectorSpeck256, 32);
}
void loop()
{
}