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449 lines
13 KiB
449 lines
13 KiB
// des.cpp - modified by Wei Dai from Phil Karn's des.c |
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// The original code and all modifications are in the public domain. |
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/* |
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* This is a major rewrite of my old public domain DES code written |
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* circa 1987, which in turn borrowed heavily from Jim Gillogly's 1977 |
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* public domain code. I pretty much kept my key scheduling code, but |
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* the actual encrypt/decrypt routines are taken from from Richard |
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* Outerbridge's DES code as printed in Schneier's "Applied Cryptography." |
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* |
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* This code is in the public domain. I would appreciate bug reports and |
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* enhancements. |
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* |
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* Phil Karn KA9Q, karn@unix.ka9q.ampr.org, August 1994. |
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*/ |
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#include "pch.h" |
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#include "misc.h" |
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#include "des.h" |
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NAMESPACE_BEGIN(CryptoPP) |
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typedef BlockGetAndPut<word32, BigEndian> Block; |
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// Richard Outerbridge's initial permutation algorithm |
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/* |
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inline void IPERM(word32 &left, word32 &right) |
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{ |
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word32 work; |
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work = ((left >> 4) ^ right) & 0x0f0f0f0f; |
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right ^= work; |
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left ^= work << 4; |
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work = ((left >> 16) ^ right) & 0xffff; |
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right ^= work; |
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left ^= work << 16; |
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work = ((right >> 2) ^ left) & 0x33333333; |
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left ^= work; |
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right ^= (work << 2); |
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work = ((right >> 8) ^ left) & 0xff00ff; |
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left ^= work; |
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right ^= (work << 8); |
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right = rotl(right, 1); |
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work = (left ^ right) & 0xaaaaaaaa; |
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left ^= work; |
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right ^= work; |
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left = rotl(left, 1); |
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} |
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inline void FPERM(word32 &left, word32 &right) |
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{ |
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word32 work; |
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right = rotr(right, 1); |
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work = (left ^ right) & 0xaaaaaaaa; |
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left ^= work; |
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right ^= work; |
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left = rotr(left, 1); |
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work = ((left >> 8) ^ right) & 0xff00ff; |
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right ^= work; |
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left ^= work << 8; |
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work = ((left >> 2) ^ right) & 0x33333333; |
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right ^= work; |
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left ^= work << 2; |
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work = ((right >> 16) ^ left) & 0xffff; |
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left ^= work; |
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right ^= work << 16; |
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work = ((right >> 4) ^ left) & 0x0f0f0f0f; |
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left ^= work; |
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right ^= work << 4; |
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} |
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*/ |
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// Wei Dai's modification to Richard Outerbridge's initial permutation |
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// algorithm, this one is faster if you have access to rotate instructions |
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// (like in MSVC) |
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static inline void IPERM(word32 &left, word32 &right) |
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{ |
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word32 work; |
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right = rotlFixed(right, 4U); |
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work = (left ^ right) & 0xf0f0f0f0; |
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left ^= work; |
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right = rotrFixed(right^work, 20U); |
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work = (left ^ right) & 0xffff0000; |
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left ^= work; |
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right = rotrFixed(right^work, 18U); |
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work = (left ^ right) & 0x33333333; |
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left ^= work; |
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right = rotrFixed(right^work, 6U); |
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work = (left ^ right) & 0x00ff00ff; |
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left ^= work; |
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right = rotlFixed(right^work, 9U); |
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work = (left ^ right) & 0xaaaaaaaa; |
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left = rotlFixed(left^work, 1U); |
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right ^= work; |
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} |
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static inline void FPERM(word32 &left, word32 &right) |
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{ |
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word32 work; |
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right = rotrFixed(right, 1U); |
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work = (left ^ right) & 0xaaaaaaaa; |
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right ^= work; |
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left = rotrFixed(left^work, 9U); |
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work = (left ^ right) & 0x00ff00ff; |
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right ^= work; |
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left = rotlFixed(left^work, 6U); |
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work = (left ^ right) & 0x33333333; |
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right ^= work; |
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left = rotlFixed(left^work, 18U); |
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work = (left ^ right) & 0xffff0000; |
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right ^= work; |
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left = rotlFixed(left^work, 20U); |
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work = (left ^ right) & 0xf0f0f0f0; |
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right ^= work; |
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left = rotrFixed(left^work, 4U); |
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} |
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void DES::Base::UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &) |
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{ |
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AssertValidKeyLength(length); |
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RawSetKey(GetCipherDirection(), userKey); |
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} |
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#ifndef CRYPTOPP_IMPORTS |
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/* Tables defined in the Data Encryption Standard documents |
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* Three of these tables, the initial permutation, the final |
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* permutation and the expansion operator, are regular enough that |
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* for speed, we hard-code them. They're here for reference only. |
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* Also, the S and P boxes are used by a separate program, gensp.c, |
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* to build the combined SP box, Spbox[]. They're also here just |
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* for reference. |
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*/ |
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#ifdef notdef |
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/* initial permutation IP */ |
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static byte ip[] = { |
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58, 50, 42, 34, 26, 18, 10, 2, |
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60, 52, 44, 36, 28, 20, 12, 4, |
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62, 54, 46, 38, 30, 22, 14, 6, |
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64, 56, 48, 40, 32, 24, 16, 8, |
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57, 49, 41, 33, 25, 17, 9, 1, |
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59, 51, 43, 35, 27, 19, 11, 3, |
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61, 53, 45, 37, 29, 21, 13, 5, |
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63, 55, 47, 39, 31, 23, 15, 7 |
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}; |
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/* final permutation IP^-1 */ |
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static byte fp[] = { |
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40, 8, 48, 16, 56, 24, 64, 32, |
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39, 7, 47, 15, 55, 23, 63, 31, |
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38, 6, 46, 14, 54, 22, 62, 30, |
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37, 5, 45, 13, 53, 21, 61, 29, |
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36, 4, 44, 12, 52, 20, 60, 28, |
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35, 3, 43, 11, 51, 19, 59, 27, |
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34, 2, 42, 10, 50, 18, 58, 26, |
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33, 1, 41, 9, 49, 17, 57, 25 |
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}; |
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/* expansion operation matrix */ |
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static byte ei[] = { |
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32, 1, 2, 3, 4, 5, |
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4, 5, 6, 7, 8, 9, |
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8, 9, 10, 11, 12, 13, |
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12, 13, 14, 15, 16, 17, |
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16, 17, 18, 19, 20, 21, |
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20, 21, 22, 23, 24, 25, |
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24, 25, 26, 27, 28, 29, |
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28, 29, 30, 31, 32, 1 |
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}; |
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/* The (in)famous S-boxes */ |
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static byte sbox[8][64] = { |
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/* S1 */ |
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14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7, |
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0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8, |
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4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0, |
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15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13, |
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/* S2 */ |
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15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10, |
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3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5, |
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0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15, |
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13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9, |
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/* S3 */ |
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10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8, |
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13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1, |
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13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7, |
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1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12, |
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/* S4 */ |
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7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15, |
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13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9, |
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10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4, |
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3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14, |
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/* S5 */ |
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2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9, |
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14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6, |
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4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14, |
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11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3, |
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/* S6 */ |
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12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11, |
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10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8, |
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9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6, |
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4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13, |
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/* S7 */ |
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4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1, |
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13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6, |
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1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2, |
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6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12, |
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/* S8 */ |
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13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7, |
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1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2, |
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7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8, |
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2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11 |
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}; |
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/* 32-bit permutation function P used on the output of the S-boxes */ |
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static byte p32i[] = { |
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16, 7, 20, 21, |
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29, 12, 28, 17, |
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1, 15, 23, 26, |
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5, 18, 31, 10, |
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2, 8, 24, 14, |
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32, 27, 3, 9, |
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19, 13, 30, 6, |
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22, 11, 4, 25 |
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}; |
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#endif |
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/* permuted choice table (key) */ |
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static const byte pc1[] = { |
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57, 49, 41, 33, 25, 17, 9, |
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1, 58, 50, 42, 34, 26, 18, |
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10, 2, 59, 51, 43, 35, 27, |
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19, 11, 3, 60, 52, 44, 36, |
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63, 55, 47, 39, 31, 23, 15, |
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7, 62, 54, 46, 38, 30, 22, |
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14, 6, 61, 53, 45, 37, 29, |
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21, 13, 5, 28, 20, 12, 4 |
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}; |
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/* number left rotations of pc1 */ |
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static const byte totrot[] = { |
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1,2,4,6,8,10,12,14,15,17,19,21,23,25,27,28 |
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}; |
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/* permuted choice key (table) */ |
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static const byte pc2[] = { |
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14, 17, 11, 24, 1, 5, |
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3, 28, 15, 6, 21, 10, |
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23, 19, 12, 4, 26, 8, |
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16, 7, 27, 20, 13, 2, |
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41, 52, 31, 37, 47, 55, |
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30, 40, 51, 45, 33, 48, |
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44, 49, 39, 56, 34, 53, |
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46, 42, 50, 36, 29, 32 |
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}; |
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/* End of DES-defined tables */ |
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/* bit 0 is left-most in byte */ |
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static const int bytebit[] = { |
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0200,0100,040,020,010,04,02,01 |
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}; |
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/* Set key (initialize key schedule array) */ |
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void RawDES::RawSetKey(CipherDir dir, const byte *key) |
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{ |
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SecByteBlock buffer(56+56+8); |
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byte *const pc1m=buffer; /* place to modify pc1 into */ |
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byte *const pcr=pc1m+56; /* place to rotate pc1 into */ |
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byte *const ks=pcr+56; |
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register int i,j,l; |
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int m; |
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for (j=0; j<56; j++) { /* convert pc1 to bits of key */ |
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l=pc1[j]-1; /* integer bit location */ |
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m = l & 07; /* find bit */ |
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pc1m[j]=(key[l>>3] & /* find which key byte l is in */ |
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bytebit[m]) /* and which bit of that byte */ |
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? 1 : 0; /* and store 1-bit result */ |
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} |
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for (i=0; i<16; i++) { /* key chunk for each iteration */ |
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memset(ks,0,8); /* Clear key schedule */ |
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for (j=0; j<56; j++) /* rotate pc1 the right amount */ |
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pcr[j] = pc1m[(l=j+totrot[i])<(j<28? 28 : 56) ? l: l-28]; |
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/* rotate left and right halves independently */ |
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for (j=0; j<48; j++){ /* select bits individually */ |
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/* check bit that goes to ks[j] */ |
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if (pcr[pc2[j]-1]){ |
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/* mask it in if it's there */ |
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l= j % 6; |
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ks[j/6] |= bytebit[l] >> 2; |
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} |
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} |
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/* Now convert to odd/even interleaved form for use in F */ |
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k[2*i] = ((word32)ks[0] << 24) |
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| ((word32)ks[2] << 16) |
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| ((word32)ks[4] << 8) |
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| ((word32)ks[6]); |
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k[2*i+1] = ((word32)ks[1] << 24) |
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| ((word32)ks[3] << 16) |
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| ((word32)ks[5] << 8) |
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| ((word32)ks[7]); |
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} |
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if (dir==DECRYPTION) // reverse key schedule order |
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for (i=0; i<16; i+=2) |
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{ |
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std::swap(k[i], k[32-2-i]); |
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std::swap(k[i+1], k[32-1-i]); |
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} |
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} |
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void RawDES::RawProcessBlock(word32 &l_, word32 &r_) const |
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{ |
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word32 l = l_, r = r_; |
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const word32 *kptr=k; |
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for (unsigned i=0; i<8; i++) |
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{ |
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word32 work = rotrFixed(r, 4U) ^ kptr[4*i+0]; |
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l ^= Spbox[6][(work) & 0x3f] |
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^ Spbox[4][(work >> 8) & 0x3f] |
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^ Spbox[2][(work >> 16) & 0x3f] |
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^ Spbox[0][(work >> 24) & 0x3f]; |
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work = r ^ kptr[4*i+1]; |
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l ^= Spbox[7][(work) & 0x3f] |
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^ Spbox[5][(work >> 8) & 0x3f] |
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^ Spbox[3][(work >> 16) & 0x3f] |
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^ Spbox[1][(work >> 24) & 0x3f]; |
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work = rotrFixed(l, 4U) ^ kptr[4*i+2]; |
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r ^= Spbox[6][(work) & 0x3f] |
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^ Spbox[4][(work >> 8) & 0x3f] |
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^ Spbox[2][(work >> 16) & 0x3f] |
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^ Spbox[0][(work >> 24) & 0x3f]; |
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work = l ^ kptr[4*i+3]; |
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r ^= Spbox[7][(work) & 0x3f] |
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^ Spbox[5][(work >> 8) & 0x3f] |
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^ Spbox[3][(work >> 16) & 0x3f] |
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^ Spbox[1][(work >> 24) & 0x3f]; |
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} |
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l_ = l; r_ = r; |
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} |
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void DES_EDE2::Base::UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &) |
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{ |
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AssertValidKeyLength(length); |
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m_des1.RawSetKey(GetCipherDirection(), userKey); |
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m_des2.RawSetKey(ReverseCipherDir(GetCipherDirection()), userKey+8); |
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} |
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void DES_EDE2::Base::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const |
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{ |
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word32 l,r; |
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Block::Get(inBlock)(l)(r); |
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IPERM(l,r); |
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m_des1.RawProcessBlock(l, r); |
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m_des2.RawProcessBlock(r, l); |
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m_des1.RawProcessBlock(l, r); |
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FPERM(l,r); |
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Block::Put(xorBlock, outBlock)(r)(l); |
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} |
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void DES_EDE3::Base::UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs &) |
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{ |
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AssertValidKeyLength(length); |
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m_des1.RawSetKey(GetCipherDirection(), userKey + (IsForwardTransformation() ? 0 : 16)); |
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m_des2.RawSetKey(ReverseCipherDir(GetCipherDirection()), userKey + 8); |
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m_des3.RawSetKey(GetCipherDirection(), userKey + (IsForwardTransformation() ? 16 : 0)); |
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} |
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void DES_EDE3::Base::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const |
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{ |
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word32 l,r; |
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Block::Get(inBlock)(l)(r); |
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IPERM(l,r); |
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m_des1.RawProcessBlock(l, r); |
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m_des2.RawProcessBlock(r, l); |
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m_des3.RawProcessBlock(l, r); |
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FPERM(l,r); |
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Block::Put(xorBlock, outBlock)(r)(l); |
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} |
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#endif // #ifndef CRYPTOPP_IMPORTS |
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static inline bool CheckParity(byte b) |
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{ |
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unsigned int a = b ^ (b >> 4); |
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return ((a ^ (a>>1) ^ (a>>2) ^ (a>>3)) & 1) == 1; |
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} |
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bool DES::CheckKeyParityBits(const byte *key) |
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{ |
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for (unsigned int i=0; i<8; i++) |
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if (!CheckParity(key[i])) |
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return false; |
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return true; |
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} |
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void DES::CorrectKeyParityBits(byte *key) |
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{ |
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for (unsigned int i=0; i<8; i++) |
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if (!CheckParity(key[i])) |
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key[i] ^= 1; |
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} |
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// Encrypt or decrypt a block of data in ECB mode |
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void DES::Base::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const |
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{ |
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word32 l,r; |
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Block::Get(inBlock)(l)(r); |
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IPERM(l,r); |
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RawProcessBlock(l, r); |
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FPERM(l,r); |
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Block::Put(xorBlock, outBlock)(r)(l); |
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} |
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void DES_XEX3::Base::UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs &) |
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{ |
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AssertValidKeyLength(length); |
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if (!m_des.get()) |
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m_des.reset(new DES::Encryption); |
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memcpy(m_x1, key + (IsForwardTransformation() ? 0 : 16), BLOCKSIZE); |
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m_des->RawSetKey(GetCipherDirection(), key + 8); |
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memcpy(m_x3, key + (IsForwardTransformation() ? 16 : 0), BLOCKSIZE); |
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} |
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void DES_XEX3::Base::ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const |
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{ |
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xorbuf(outBlock, inBlock, m_x1, BLOCKSIZE); |
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m_des->ProcessAndXorBlock(outBlock, xorBlock, outBlock); |
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xorbuf(outBlock, m_x3, BLOCKSIZE); |
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} |
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NAMESPACE_END
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