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117 lines
4.4 KiB
117 lines
4.4 KiB
/* |
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* Copyright (C) 2018 Daniel Scharrer |
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* |
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* This software is provided 'as-is', without any express or implied |
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* warranty. In no event will the author(s) be held liable for any damages |
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* arising from the use of this software. |
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* |
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* Permission is granted to anyone to use this software for any purpose, |
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* including commercial applications, and to alter it and redistribute it |
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* freely, subject to the following restrictions: |
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* |
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* 1. The origin of this software must not be misrepresented; you must not |
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* claim that you wrote the original software. If you use this software |
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* in a product, an acknowledgment in the product documentation would be |
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* appreciated but is not required. |
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* 2. Altered source versions must be plainly marked as such, and must not be |
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* misrepresented as being the original software. |
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* 3. This notice may not be removed or altered from any source distribution. |
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*/ |
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#include "crypto/arc4.hpp" |
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#include <algorithm> |
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#include "util/endian.hpp" |
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#include "util/test.hpp" |
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namespace crypto { |
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void arc4::init(const char * key, size_t length) { |
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a = b = 0; |
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for(size_t i = 0; i < sizeof(state); i++){ |
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state[i] = boost::uint8_t(i); |
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} |
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size_t j = 0; |
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for(size_t i = 0; i < sizeof(state); i++) { |
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j = (j + state[i] + boost::uint8_t(key[i % length])) % sizeof(state); |
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std::swap(state[i], state[j]); |
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} |
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} |
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void arc4::update() { |
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a = (a + 1) % sizeof(state); |
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b = (b + state[a]) % sizeof(state); |
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std::swap(state[a], state[b]); |
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} |
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void arc4::discard(size_t length) { |
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for(size_t i = 0; i < length; i++) { |
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update(); |
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} |
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} |
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void arc4::crypt(const char * in, char * out, size_t length) { |
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for(size_t i = 0; i < length; i++) { |
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update(); |
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out[i] = char(state[size_t(state[a] + state[b]) % sizeof(state)] ^ boost::uint8_t(in[i])); |
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} |
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} |
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INNOEXTRACT_TEST(arc4, |
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const boost::uint8_t key[] = { |
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0x7f, 0xe5, 0x54, 0xd3, 0x47, 0x1e, 0xc7, 0xba, 0xb3, 0x37, |
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0x4f, 0xfd, 0x46, 0xb3, 0x88, 0x85, 0x12, 0x2b, 0x13, 0x14 |
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}; |
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const boost::uint8_t ciphertext[] = { |
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0x06, 0x58, 0x8c, 0x39, 0xf8, 0xc7, 0xf3, 0xbd, 0x17, 0x74, 0x7c, 0x84, 0xd1, 0xaf, 0x6c, 0xcf, |
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0x51, 0x98, 0x8a, 0x32, 0xe5, 0x25, 0x4a, 0xae, 0x04, 0xda, 0x18, 0xa7, 0x02, 0xd7, 0xe5, 0x34, |
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0x0a, 0x34, 0x3a, 0x7c, 0xc1, 0x9c, 0x9c, 0xb4, 0x07, 0xf6, 0x52, 0x31, 0x49, 0x21, 0x7f, 0xc2, |
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0x9a, 0x18, 0x25, 0xa1, 0x86, 0x37, 0x9c, 0x47, 0x8b, 0x61, 0x72, 0x9c, 0x93, 0x8a, 0x72, 0xbd, |
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0x99, 0xc9, 0xc4, 0x5f, 0x44, 0x28, 0xcf, 0x28, 0xe6, 0x9a, 0x0b, 0x2d, 0xad, 0x33, 0xf1, 0x8c, |
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0x3b, 0x51, 0xa6, 0x72, 0x9c, 0x0a, 0x97, 0x73, 0xe6, 0x6d, 0xd1, 0xb6, 0xed, 0xb1, 0x2f, 0xb9, |
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0x1c, 0x68, 0x7c, 0x64, 0xf4, 0x57, 0x54, 0xaa, 0x70, 0xb2, 0x2a, 0x6a, 0x7f, 0xa8, 0xac, 0x55, |
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0x6e, 0xc2, 0x9c, 0x6f, 0x7f, 0xc6, 0x80, 0xb4, 0xe3, 0xf2, 0xe2, 0xfd, 0x4b, 0x0c, 0x46, 0x51, |
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0xbf, 0xbd, 0xd2, 0x51, 0x93, 0x4d, 0x20, 0x22, 0x7e, 0xdb, 0x84, 0xbb, 0xd8, 0x3f, 0x6a, 0x91, |
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0x72, 0x03, 0x3a, 0x4f, 0x0b, 0x91, 0xc8, 0xae, 0xb4, 0x27, 0xd9, 0xc7, 0x55, 0x27, 0x7f, 0xa6, |
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0x5a, 0x73, 0xe6, 0xa1, 0x0f, 0x81, 0xe0, 0x51, 0xa1, 0x5c, 0xe8, 0xfd, 0x89, 0xa5, 0x55, 0xb5, |
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0x7a, 0x67, 0xa9, 0x5d, 0x1b, 0xff, 0x0a, 0x3d, 0x34, 0xc1, 0x08, 0xe7, 0x06, 0xd6, 0x03, 0xb8, |
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0x6f, 0x5e, 0xb8, 0x88, 0x4c, 0x66, 0x7a, 0xa4, 0x77, 0x0b, 0x03, 0x9c, 0xad, 0xef, 0x43, 0x5b, |
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0xff, 0x23, 0x92, 0x2d, 0xf9, 0x84, 0x1d, 0xa6, 0x0a, 0x1e, 0x1f, 0xfe, 0x22, 0xaf, 0x6f, 0x87, |
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0x95, 0xf7, 0x17, 0xaa, 0x49, 0xc4, 0x35, 0xb3, 0xdd, 0xcc, 0x8d, 0x76, 0x17, 0x93, 0xa3, 0xaa, |
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0x7b, 0x02, 0x45, 0x9d, 0xb2, 0x65, 0xb7, 0x9f, 0x96, 0xd8, 0xbe, 0xd6, 0xef, 0x46, 0xdb, 0x94, |
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0xb2, 0x15, 0xd6, 0x71, 0x26, 0x1e, 0xc8, 0xed, 0xd8, 0x0e, 0x18, 0xca, 0x23, 0xba, 0x78, 0x56, |
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0x98, 0xec, 0x10, 0x6d, 0x5b, 0xdb, 0x7a, 0xcf, 0x43, 0x19, 0x68, 0x7f, 0xdd, 0xb0, 0x15, 0x42, |
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0x50, 0xb3, 0x04, 0xc4, 0x6c, 0x11, 0x95, 0xed, 0xe8, 0x1c, 0xb6, 0xcd, 0x23, 0x3d, 0x5a, 0x0f |
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}; |
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arc4 cipher; |
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cipher.init(reinterpret_cast<const char *>(key), sizeof(key)); |
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char buffer0[sizeof(ciphertext)]; |
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cipher.crypt(testdata, buffer0, sizeof(ciphertext)); |
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test_equals("crypt", buffer0, ciphertext, sizeof(ciphertext)); |
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cipher.init(reinterpret_cast<const char *>(key), sizeof(key)); |
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cipher.crypt(testdata, buffer0, 3); |
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cipher.discard(129); |
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char buffer1[sizeof(ciphertext) - 132]; |
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cipher.crypt(testdata + 132, buffer1, sizeof(ciphertext) - 132); |
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test_equals("discard", buffer1, ciphertext + 132, sizeof(ciphertext) - 132); |
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) |
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} // namespace crypto
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