crypto: add XXTEA {en,de}cryption.
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@ -29,6 +29,8 @@ UTIL_FILES = \
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crypto/tea.hpp \
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crypto/xtea.cpp \
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crypto/xtea.hpp \
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crypto/xxtea.cpp \
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crypto/xxtea.hpp \
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crypto/arc4.cpp \
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crypto/arc4.hpp \
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debug.cpp \
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@ -270,6 +272,7 @@ TEST_BIN = \
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test/crypto/arc4 \
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test/crypto/tea \
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test/crypto/xtea \
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test/crypto/xxtea \
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test/extent \
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test/fixed \
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test/float \
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104
crypto/xxtea.cpp
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104
crypto/xxtea.cpp
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@ -0,0 +1,104 @@
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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2015 Danny Robson <danny@nerdcruft.net>
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*/
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#include "xxtea.hpp"
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#include <cstring>
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// test vectors: http://www.cix.co.uk/~klockstone/teavect.htm
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using util::crypto::XXTEA;
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//-----------------------------------------------------------------------------
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static const uint32_t MAGIC = 0x9E3779B9;
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static const unsigned ITERATIONS = 32; // each iteration performs two feistel rounds
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//-----------------------------------------------------------------------------
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static constexpr uint32_t mix (uint32_t Z,
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uint32_t Y,
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uint32_t S,
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size_t E,
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size_t P,
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const uint32_t *restrict K)
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{
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return ((Z >> 5 ^ Y << 2) + (Y >> 3 ^ Z << 4)) ^ ((S ^ Y) + (K[(P & 3) ^ E] ^ Z));
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}
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//-----------------------------------------------------------------------------
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XXTEA::XXTEA (key_t _key):
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m_key (_key)
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{ ; }
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//-----------------------------------------------------------------------------
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void
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XXTEA::encrypt (uint32_t *restrict data, size_t count)
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{
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if (count < 2)
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throw std::invalid_argument ("minimum blocksize is 64 bits");
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uint32_t sum = 0;
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uint32_t z = data[count - 1];
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uint32_t y, e, p;
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unsigned rounds = 6 + 52 / count;
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do {
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sum += MAGIC;
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e = (sum >> 2) & 3;
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for (p = 0; p < count - 1; p++) {
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y = data[p + 1];
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z = data[p] += mix (z, y, sum, e, p, m_key.data ());
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}
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y = data[0];
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z = data[count - 1] += mix (z, y, sum, e, p, m_key.data ());
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} while (--rounds);
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}
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//-----------------------------------------------------------------------------
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void
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XXTEA::decrypt (uint32_t *restrict data, size_t count)
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{
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if (count < 2)
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throw std::invalid_argument ("minimum blocksize is 64 bits");
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uint32_t y, z, sum;
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unsigned p, rounds, e;
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rounds = 6 + 52 / count;
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sum = rounds * MAGIC;
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y = data[0];
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do {
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e = (sum >> 2) & 3;
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for (p = count - 1; p > 0; p--) {
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z = data[p - 1];
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y = data[p ] -= mix (z, y, sum, e, p, m_key.data ());
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}
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z = data[count - 1];
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y = data[ 0] -= mix (z, y, sum, e, p, m_key.data ());
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sum -= MAGIC;
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} while (--rounds);
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}
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42
crypto/xxtea.hpp
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42
crypto/xxtea.hpp
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@ -0,0 +1,42 @@
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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2015 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_TEA_HPP
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#define __UTIL_TEA_HPP
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#include <array>
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#include <cstdint>
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#include <cstddef>
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namespace util { namespace crypto {
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// http://en.wikipedia.org/wiki/XXTEA
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// 'corrected' block TEA
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class XXTEA {
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public:
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using key_t = std::array<uint32_t,4>;
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XXTEA (key_t);
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void encrypt (uint32_t *restrict data, size_t count);
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void decrypt (uint32_t *restrict data, size_t count);
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private:
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key_t m_key;
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};
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} }
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#endif
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121
test/crypto/xxtea.cpp
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121
test/crypto/xxtea.cpp
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@ -0,0 +1,121 @@
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#include "crypto/xxtea.hpp"
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#include "tap.hpp"
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#include "types.hpp"
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int
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main ()
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{
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// test vectors from 'TeaCrypt', by Logan J. Drews.
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static const struct {
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std::array<uint32_t,4> key;
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std::vector<uint32_t> dec;
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std::vector<uint32_t> enc;
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} TESTS[] = {
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// 64 bit
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{
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{ 0x00000000, 0x00000000, 0x00000000, 0x00000000 },
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{ 0x00000000, 0x00000000 },
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{ 0x053704AB, 0x575D8C80 }
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},
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{
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{0x00000000, 0x00000000, 0x00000000, 0x00000000},
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{0x01020304, 0x05060708},
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{0xE6911910, 0x0C35DCDA},
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},
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{
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{0x00112233, 0x44556677, 0x8899AABB, 0xCCDDEEFF},
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{0x01020304, 0x05060708},
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{0x961D49FC, 0x61FF12D6},
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},
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{
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{0x00112233, 0x44556677, 0x8899AABB, 0xCCDDEEFF},
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{0x01234567, 0x89ABCDEF},
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{0x34354989, 0xDD7D1A7A},
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},
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// 96 bit
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{
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{0x00000000, 0x00000000, 0x00000000, 0x00000000},
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{0x00000000, 0x00000000, 0x00000000},
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{0x5E3CD3F0, 0xE109E3CE, 0x79D7C945},
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},
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{
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{0x00000000, 0x00000000, 0x00000000, 0x00000000},
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{0x00010203, 0x04050607, 0x08090A0B},
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{0x5A545AAC, 0x684EB2CB, 0x3E1B8AA0},
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},
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{
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{0x00112233, 0x44556677, 0x8899AABB, 0xCCDDEEFF},
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{0x00010203, 0x04050607, 0x08090A0B},
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{0x2E77CCEC, 0x674F5149, 0xA0E56496},
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},
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{
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{0x00112233, 0x44556677, 0x8899AABB, 0xCCDDEEFF},
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{0x01234567, 0x89ABCDEF, 0x01234567},
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{0xEBC5DD46, 0xBE0FEE71, 0xC6BF7193},
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},
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// 128 bit
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{
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{0x00000000, 0x00000000, 0x00000000, 0x00000000},
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{0x00000000, 0x00000000, 0x00000000, 0x00000000},
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{0xE6C8D5FF, 0x070FB6E4, 0x98A534F7, 0xAC03E399},
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},
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{
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{0x00000000, 0x00000000, 0x00000000, 0x00000000},
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{0x00010203, 0x04050607, 0x08090A0B, 0x0C0D0E0F},
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{0xAF5CFB0E, 0xAE73552B, 0x1D968A9F, 0x5CB94509},
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},
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{
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{0x00112233, 0x44556677, 0x8899AABB, 0xCCDDEEFF},
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{0x00010203, 0x04050607, 0x08090A0B, 0x0C0D0E0F},
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{0x3EA0E16C, 0x9969535A, 0xE4796D50, 0xF217EEEA},
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},
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{
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{0x00112233, 0x44556677, 0x8899AABB, 0xCCDDEEFF},
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{0x01234567, 0x89ABCDEF, 0x01234567, 0x89ABCDEF},
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{0x2B4AB1A4, 0x0E487B6D, 0x9A3AACC7, 0xE4132216},
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},
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};
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util::TAP::logger tap;
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for (size_t i = 0; i < elems (TESTS); ++i) {
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const auto &t = TESTS[i];
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CHECK_EQ (t.dec.size (), t.enc.size ());
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util::crypto::XXTEA gen (t.key);
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std::vector<uint32_t> enc (t.dec);
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gen.encrypt (enc.data (), enc.size ());
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std::vector<uint32_t> dec (enc);
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gen.decrypt (dec.data (), dec.size ());
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{
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std::ostringstream os;
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os << "XXTEA_enc " << i;
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tap.expect (enc == t.enc, os.str ());
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}
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{
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std::ostringstream os;
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os << "XXTEA_dec " << i;
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tap.expect (dec == t.dec, os.str ());
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}
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}
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return tap.status ();
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}
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