mirror of
https://github.com/taigrr/arduinolibs
synced 2025-01-18 04:33:12 -08:00
33df6a873d
Rename SpeckLowMemory to SpeckTiny for the encrypt-only version. SpeckSmall for the version that supports both encryption and decryption.
615 lines
17 KiB
C++
615 lines
17 KiB
C++
/*
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* Copyright (C) 2015 Southern Storm Software, Pty Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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* DEALINGS IN THE SOFTWARE.
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*/
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#include "Speck.h"
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#include "Crypto.h"
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#include "utility/RotateUtil.h"
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#include "utility/EndianUtil.h"
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#include <string.h>
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/**
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* \class Speck Speck.h <Speck.h>
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* \brief Speck block cipher with a 128-bit block size.
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*
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* Speck is a family of lightweight block ciphers designed by the
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* National Security Agency (NSA). The ciphers are highly optimized
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* for software implementation on microcontrollers.
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*
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* This class implements the Speck family that uses 128-bit block sizes
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* with 128-bit, 192-bit, or 256-bit key sizes. Other Speck families support
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* smaller block sizes of 32, 48, 64, or 96 bits but such block sizes are
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* too small for use in modern cryptosystems.
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*
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* \note Current crytoanalysis (up until 2015) has not revealed any obvious
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* weaknesses in the full-round version of Speck. But if you are wary of
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* ciphers designed by the NSA, then use ChaCha or AES instead.
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*
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* The SpeckTiny and SpeckSmall classes provide alternative implementations
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* that have reduced RAM and flash size requirements at the cost of some
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* features and performance.
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*
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* References: https://en.wikipedia.org/wiki/Speck_%28cipher%29,
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* http://eprint.iacr.org/2013/404
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*
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* \sa SpeckTiny, SpeckSmall
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*/
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// The "avr-gcc" compiler doesn't do a very good job of compiling
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// code involving 64-bit values. So we have to use inline assembly.
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// It also helps to break the state up into 32-bit quantities
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// because "asm" supports register names like %A0, %B0, %C0, %D0
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// for the bytes in a 32-bit quantity, but it does not support
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// %E0, %F0, %G0, %H0 for the high bytes of a 64-bit quantity.
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#if defined(__AVR__)
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#define USE_AVR_INLINE_ASM 1
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#endif
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/**
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* \brief Constructs a Speck block cipher with no initial key.
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*
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* This constructor must be followed by a call to setKey() before the
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* block cipher can be used for encryption or decryption.
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*/
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Speck::Speck()
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: rounds(32)
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{
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}
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Speck::~Speck()
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{
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clean(k);
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}
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size_t Speck::blockSize() const
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{
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return 16;
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}
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size_t Speck::keySize() const
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{
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// Also supports 128-bit and 192-bit, but we only report 256-bit.
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return 32;
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}
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// Pack/unpack byte-aligned big-endian 64-bit quantities.
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#define pack64(data, value) \
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do { \
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uint64_t v = htobe64((value)); \
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memcpy((data), &v, sizeof(uint64_t)); \
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} while (0)
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#define unpack64(value, data) \
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do { \
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memcpy(&(value), (data), sizeof(uint64_t)); \
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(value) = be64toh((value)); \
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} while (0)
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bool Speck::setKey(const uint8_t *key, size_t len)
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{
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#if USE_AVR_INLINE_ASM
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uint64_t l[4];
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uint8_t m, mb;
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if (len == 32) {
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m = 4;
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mb = 3 * 8;
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} else if (len == 24) {
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m = 3;
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mb = 2 * 8;
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} else if (len == 16) {
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m = 2;
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mb = 8;
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} else {
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return false;
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}
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rounds = 30 + m;
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// Copy the first (m - 1) * 8 bytes of the key into the "l" array
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// in reverse order to convert big endian into little-endian.
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__asm__ __volatile__ (
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"1:\n"
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"ld __tmp_reg__,-Z\n"
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"st X+,__tmp_reg__\n"
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"dec %2\n"
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"brne 1b\n"
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: : "x"(l), "z"(key + len - 8), "r"(mb)
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);
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// Copy the final 8 bytes of the key into k[0] in reverse order.
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__asm__ __volatile__ (
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"1:\n"
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"ld __tmp_reg__,-Z\n"
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"st X+,__tmp_reg__\n"
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"dec %2\n"
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"brne 1b\n"
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: : "x"(k), "z"(key + len), "r"(8)
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);
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// Expand the key to the full key schedule.
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__asm__ __volatile__ (
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"1:\n"
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// l[li_out] = (k[i] + rightRotate8_64(l[li_in])) ^ i;
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"add %A1,%2\n" // X = &(l[li_in])
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"adc %B1,__zero_reg__\n"
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"ld r15,X+\n" // x = rightRotate8_64(l[li_in])
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"ld r8,X+\n"
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"ld r9,X+\n"
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"ld r10,X+\n"
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"ld r11,X+\n"
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"ld r12,X+\n"
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"ld r13,X+\n"
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"ld r14,X+\n"
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"ld r16,Z+\n" // y = k[i]
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"ld r17,Z+\n"
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"ld r18,Z+\n"
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"ld r19,Z+\n"
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"ld r20,Z+\n"
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"ld r21,Z+\n"
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"ld r22,Z+\n"
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"ld r23,Z+\n"
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"add r8,r16\n" // x += y
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"adc r9,r17\n"
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"adc r10,r18\n"
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"adc r11,r19\n"
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"adc r12,r20\n"
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"adc r13,r21\n"
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"adc r14,r22\n"
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"adc r15,r23\n"
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"eor r8,%4\n" // x ^= i
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// X = X - li_in + li_out
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"ldi r24,8\n" // li_in = li_in + 1
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"add %2,r24\n"
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"sub %A1,%2\n" // return X to its initial value
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"sbc %B1,__zero_reg__\n"
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"ldi r25,0x1f\n"
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"and %2,r25\n" // li_in = li_in % 4
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"add %A1,%3\n" // X = &(l[li_out])
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"adc %B1,__zero_reg__\n"
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"st X+,r8\n" // l[li_out] = x
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"st X+,r9\n"
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"st X+,r10\n"
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"st X+,r11\n"
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"st X+,r12\n"
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"st X+,r13\n"
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"st X+,r14\n"
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"st X+,r15\n"
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"add %3,r24\n" // li_out = li_out + 1
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"sub %A1,%3\n" // return X to its initial value
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"sbc %B1,__zero_reg__\n"
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"and %3,r25\n" // li_out = li_out % 4
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// k[i + 1] = leftRotate3_64(k[i]) ^ l[li_out];
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"lsl r16\n" // y = leftRotate1_64(y)
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"rol r17\n"
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"rol r18\n"
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"rol r19\n"
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"rol r20\n"
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"rol r21\n"
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"rol r22\n"
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"rol r23\n"
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"adc r16,__zero_reg__\n"
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"lsl r16\n" // y = leftRotate1_64(y)
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"rol r17\n"
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"rol r18\n"
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"rol r19\n"
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"rol r20\n"
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"rol r21\n"
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"rol r22\n"
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"rol r23\n"
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"adc r16,__zero_reg__\n"
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"lsl r16\n" // y = leftRotate1_64(y)
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"rol r17\n"
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"rol r18\n"
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"rol r19\n"
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"rol r20\n"
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"rol r21\n"
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"rol r22\n"
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"rol r23\n"
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"adc r16,__zero_reg__\n"
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"eor r16,r8\n" // y ^= x
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"eor r17,r9\n"
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"eor r18,r10\n"
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"eor r19,r11\n"
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"eor r20,r12\n"
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"eor r21,r13\n"
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"eor r22,r14\n"
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"eor r23,r15\n"
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"st Z,r16\n" // k[i + 1] = y
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"std Z+1,r17\n"
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"std Z+2,r18\n"
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"std Z+3,r19\n"
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"std Z+4,r20\n"
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"std Z+5,r21\n"
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"std Z+6,r22\n"
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"std Z+7,r23\n"
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// Loop
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"inc %4\n" // ++i
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"dec %5\n" // --rounds
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"breq 2f\n"
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"rjmp 1b\n"
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"2:\n"
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: : "z"(k), "x"(l),
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"r"((uint8_t)0), // initial value of li_in
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"r"((uint8_t)((m - 1) * 8)), // initial value of li_out
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"r"(0), // initial value of i
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"r"(rounds - 1)
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: "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
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"r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
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"r24", "r25"
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);
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#else
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uint64_t l[4];
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uint8_t m;
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if (len == 32) {
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m = 4;
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unpack64(l[2], key);
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unpack64(l[1], key + 8);
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unpack64(l[0], key + 16);
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unpack64(k[0], key + 24);
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} else if (len == 24) {
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m = 3;
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unpack64(l[1], key);
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unpack64(l[0], key + 8);
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unpack64(k[0], key + 16);
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} else if (len == 16) {
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m = 2;
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unpack64(l[0], key);
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unpack64(k[0], key + 8);
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} else {
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return false;
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}
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rounds = 30 + m;
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uint8_t li_in = 0;
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uint8_t li_out = m - 1;
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for (uint8_t i = 0; i < (rounds - 1); ++i) {
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l[li_out] = (k[i] + rightRotate8_64(l[li_in])) ^ i;
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k[i + 1] = leftRotate3_64(k[i]) ^ l[li_out];
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if ((++li_in) >= m)
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li_in = 0;
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if ((++li_out) >= m)
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li_out = 0;
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}
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#endif
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clean(l);
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return true;
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}
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void Speck::encryptBlock(uint8_t *output, const uint8_t *input)
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{
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#if USE_AVR_INLINE_ASM
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uint32_t xlow, xhigh, ylow, yhigh;
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// Unpack the input into the x and y variables, converting
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// from big-endian into little-endian in the process.
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__asm__ __volatile__ (
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"ld %D1,Z\n"
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"ldd %C1,Z+1\n"
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"ldd %B1,Z+2\n"
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"ldd %A1,Z+3\n"
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"ldd %D0,Z+4\n"
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"ldd %C0,Z+5\n"
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"ldd %B0,Z+6\n"
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"ldd %A0,Z+7\n"
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"ldd %D3,Z+8\n"
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"ldd %C3,Z+9\n"
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"ldd %B3,Z+10\n"
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"ldd %A3,Z+11\n"
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"ldd %D2,Z+12\n"
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"ldd %C2,Z+13\n"
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"ldd %B2,Z+14\n"
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"ldd %A2,Z+15\n"
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: "=r"(xlow), "=r"(xhigh), "=r"(ylow), "=r"(yhigh)
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: "z"(input)
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);
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// Perform all encryption rounds. Z points to the key schedule.
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__asm__ __volatile__ (
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"1:\n"
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// x = (rightRotate8_64(x) + y) ^ *s++;
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"mov __tmp_reg__,%A0\n" // x = rightRotate8_64(x)
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"mov %A0,%B0\n"
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"mov %B0,%C0\n"
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"mov %C0,%D0\n"
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"mov %D0,%A1\n"
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"mov %A1,%B1\n"
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"mov %B1,%C1\n"
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"mov %C1,%D1\n"
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"mov %D1,__tmp_reg__\n"
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"add %A0,%A2\n" // x += y
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"adc %B0,%B2\n"
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"adc %C0,%C2\n"
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"adc %D0,%D2\n"
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"adc %A1,%A3\n"
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"adc %B1,%B3\n"
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"adc %C1,%C3\n"
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"adc %D1,%D3\n"
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"ld __tmp_reg__,Z+\n" // x ^= *s++
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"eor %A0,__tmp_reg__\n"
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"ld __tmp_reg__,Z+\n"
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"eor %B0,__tmp_reg__\n"
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"ld __tmp_reg__,Z+\n"
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"eor %C0,__tmp_reg__\n"
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"ld __tmp_reg__,Z+\n"
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"eor %D0,__tmp_reg__\n"
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"ld __tmp_reg__,Z+\n"
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"eor %A1,__tmp_reg__\n"
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"ld __tmp_reg__,Z+\n"
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"eor %B1,__tmp_reg__\n"
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"ld __tmp_reg__,Z+\n"
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"eor %C1,__tmp_reg__\n"
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"ld __tmp_reg__,Z+\n"
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"eor %D1,__tmp_reg__\n"
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// y = leftRotate3_64(y) ^ x;
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"lsl %A2\n" // y = leftRotate1_64(y)
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"rol %B2\n"
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"rol %C2\n"
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"rol %D2\n"
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"rol %A3\n"
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"rol %B3\n"
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"rol %C3\n"
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"rol %D3\n"
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"adc %A2,__zero_reg__\n"
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"lsl %A2\n" // y = leftRotate1_64(y)
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"rol %B2\n"
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"rol %C2\n"
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"rol %D2\n"
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"rol %A3\n"
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"rol %B3\n"
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"rol %C3\n"
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"rol %D3\n"
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"adc %A2,__zero_reg__\n"
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"lsl %A2\n" // y = leftRotate1_64(y)
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"rol %B2\n"
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"rol %C2\n"
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"rol %D2\n"
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"rol %A3\n"
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"rol %B3\n"
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"rol %C3\n"
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"rol %D3\n"
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"adc %A2,__zero_reg__\n"
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"eor %A2,%A0\n" // y ^= x
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"eor %B2,%B0\n"
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"eor %C2,%C0\n"
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"eor %D2,%D0\n"
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"eor %A3,%A1\n"
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"eor %B3,%B1\n"
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"eor %C3,%C1\n"
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"eor %D3,%D1\n"
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// Loop
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"dec %5\n" // --round
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"breq 2f\n"
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"rjmp 1b\n"
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"2:\n"
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: "+r"(xlow), "+r"(xhigh), "+r"(ylow), "+r"(yhigh)
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: "z"(k), "r"(rounds)
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);
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// Pack the results into the output and convert back to big-endian.
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__asm__ __volatile__ (
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"st Z,%D1\n"
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"std Z+1,%C1\n"
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"std Z+2,%B1\n"
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"std Z+3,%A1\n"
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"std Z+4,%D0\n"
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"std Z+5,%C0\n"
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"std Z+6,%B0\n"
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"std Z+7,%A0\n"
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"std Z+8,%D3\n"
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"std Z+9,%C3\n"
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"std Z+10,%B3\n"
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"std Z+11,%A3\n"
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"std Z+12,%D2\n"
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"std Z+13,%C2\n"
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"std Z+14,%B2\n"
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"std Z+15,%A2\n"
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: : "r"(xlow), "r"(xhigh), "r"(ylow), "r"(yhigh), "z"(output)
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);
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#else
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uint64_t x, y;
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const uint64_t *s = k;
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unpack64(x, input);
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unpack64(y, input + 8);
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for (uint8_t round = rounds; round > 0; --round, ++s) {
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x = (rightRotate8_64(x) + y) ^ s[0];
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y = leftRotate3_64(y) ^ x;
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}
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pack64(output, x);
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pack64(output + 8, y);
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#endif
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}
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void Speck::decryptBlock(uint8_t *output, const uint8_t *input)
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{
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#if USE_AVR_INLINE_ASM
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uint32_t xlow, xhigh, ylow, yhigh;
|
|
|
|
// Unpack the input into the x and y variables, converting
|
|
// from big-endian into little-endian in the process.
|
|
__asm__ __volatile__ (
|
|
"ld %D1,Z\n"
|
|
"ldd %C1,Z+1\n"
|
|
"ldd %B1,Z+2\n"
|
|
"ldd %A1,Z+3\n"
|
|
"ldd %D0,Z+4\n"
|
|
"ldd %C0,Z+5\n"
|
|
"ldd %B0,Z+6\n"
|
|
"ldd %A0,Z+7\n"
|
|
"ldd %D3,Z+8\n"
|
|
"ldd %C3,Z+9\n"
|
|
"ldd %B3,Z+10\n"
|
|
"ldd %A3,Z+11\n"
|
|
"ldd %D2,Z+12\n"
|
|
"ldd %C2,Z+13\n"
|
|
"ldd %B2,Z+14\n"
|
|
"ldd %A2,Z+15\n"
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|
: "=r"(xlow), "=r"(xhigh), "=r"(ylow), "=r"(yhigh)
|
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: "z"(input)
|
|
);
|
|
|
|
// Perform all decryption rounds. Z points to the end of key schedule.
|
|
__asm__ __volatile__ (
|
|
"1:\n"
|
|
// y = rightRotate3_64(x ^ y);
|
|
"eor %A2,%A0\n" // y ^= x
|
|
"eor %B2,%B0\n"
|
|
"eor %C2,%C0\n"
|
|
"eor %D2,%D0\n"
|
|
"eor %A3,%A1\n"
|
|
"eor %B3,%B1\n"
|
|
"eor %C3,%C1\n"
|
|
"eor %D3,%D1\n"
|
|
|
|
"bst %A2,0\n" // y = rightRotate1_64(y)
|
|
"ror %D3\n"
|
|
"ror %C3\n"
|
|
"ror %B3\n"
|
|
"ror %A3\n"
|
|
"ror %D2\n"
|
|
"ror %C2\n"
|
|
"ror %B2\n"
|
|
"ror %A2\n"
|
|
"bld %D3,7\n"
|
|
|
|
"bst %A2,0\n" // y = rightRotate1_64(y)
|
|
"ror %D3\n"
|
|
"ror %C3\n"
|
|
"ror %B3\n"
|
|
"ror %A3\n"
|
|
"ror %D2\n"
|
|
"ror %C2\n"
|
|
"ror %B2\n"
|
|
"ror %A2\n"
|
|
"bld %D3,7\n"
|
|
|
|
"bst %A2,0\n" // y = rightRotate1_64(y)
|
|
"ror %D3\n"
|
|
"ror %C3\n"
|
|
"ror %B3\n"
|
|
"ror %A3\n"
|
|
"ror %D2\n"
|
|
"ror %C2\n"
|
|
"ror %B2\n"
|
|
"ror %A2\n"
|
|
"bld %D3,7\n"
|
|
|
|
// x = leftRotate8_64((x ^ *s--) - y);
|
|
"ld __tmp_reg__,-Z\n" // x ^= *s--
|
|
"eor %D1,__tmp_reg__\n"
|
|
"ld __tmp_reg__,-Z\n"
|
|
"eor %C1,__tmp_reg__\n"
|
|
"ld __tmp_reg__,-Z\n"
|
|
"eor %B1,__tmp_reg__\n"
|
|
"ld __tmp_reg__,-Z\n"
|
|
"eor %A1,__tmp_reg__\n"
|
|
"ld __tmp_reg__,-Z\n"
|
|
"eor %D0,__tmp_reg__\n"
|
|
"ld __tmp_reg__,-Z\n"
|
|
"eor %C0,__tmp_reg__\n"
|
|
"ld __tmp_reg__,-Z\n"
|
|
"eor %B0,__tmp_reg__\n"
|
|
"ld __tmp_reg__,-Z\n"
|
|
"eor %A0,__tmp_reg__\n"
|
|
|
|
"sub %A0,%A2\n" // x -= y
|
|
"sbc %B0,%B2\n"
|
|
"sbc %C0,%C2\n"
|
|
"sbc %D0,%D2\n"
|
|
"sbc %A1,%A3\n"
|
|
"sbc %B1,%B3\n"
|
|
"sbc %C1,%C3\n"
|
|
"sbc %D1,%D3\n"
|
|
|
|
"mov __tmp_reg__,%D1\n" // x = lefRotate8_64(x)
|
|
"mov %D1,%C1\n"
|
|
"mov %C1,%B1\n"
|
|
"mov %B1,%A1\n"
|
|
"mov %A1,%D0\n"
|
|
"mov %D0,%C0\n"
|
|
"mov %C0,%B0\n"
|
|
"mov %B0,%A0\n"
|
|
"mov %A0,__tmp_reg__\n"
|
|
|
|
// Loop
|
|
"dec %5\n" // --round
|
|
"breq 2f\n"
|
|
"rjmp 1b\n"
|
|
"2:\n"
|
|
: "+r"(xlow), "+r"(xhigh), "+r"(ylow), "+r"(yhigh)
|
|
: "z"(k + rounds), "r"(rounds)
|
|
);
|
|
|
|
// Pack the results into the output and convert back to big-endian.
|
|
__asm__ __volatile__ (
|
|
"st Z,%D1\n"
|
|
"std Z+1,%C1\n"
|
|
"std Z+2,%B1\n"
|
|
"std Z+3,%A1\n"
|
|
"std Z+4,%D0\n"
|
|
"std Z+5,%C0\n"
|
|
"std Z+6,%B0\n"
|
|
"std Z+7,%A0\n"
|
|
"std Z+8,%D3\n"
|
|
"std Z+9,%C3\n"
|
|
"std Z+10,%B3\n"
|
|
"std Z+11,%A3\n"
|
|
"std Z+12,%D2\n"
|
|
"std Z+13,%C2\n"
|
|
"std Z+14,%B2\n"
|
|
"std Z+15,%A2\n"
|
|
: : "r"(xlow), "r"(xhigh), "r"(ylow), "r"(yhigh), "z"(output)
|
|
);
|
|
#else
|
|
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);
|
|
#endif
|
|
}
|
|
|
|
void Speck::clear()
|
|
{
|
|
clean(k);
|
|
}
|