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440 lines
12 KiB
C++
440 lines
12 KiB
C++
// 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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#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::UncheckedSetKey(CipherDir dir, const byte *key, unsigned int length)
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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(CipherDir dir, const byte *key, unsigned int length)
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{
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AssertValidKeyLength(length);
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m_des1.UncheckedSetKey(dir, key);
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m_des2.UncheckedSetKey(ReverseCipherDir(dir), key+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(CipherDir dir, const byte *key, unsigned int length)
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{
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AssertValidKeyLength(length);
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m_des1.UncheckedSetKey(dir, key+(dir==ENCRYPTION?0:2*8));
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m_des2.UncheckedSetKey(ReverseCipherDir(dir), key+8);
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m_des3.UncheckedSetKey(dir, key+(dir==DECRYPTION?0:2*8));
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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(CipherDir dir, const byte *key, unsigned int length)
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{
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AssertValidKeyLength(length);
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memcpy(m_x1, key+(dir==ENCRYPTION?0:2*8), BLOCKSIZE);
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m_des.UncheckedSetKey(dir, key+8);
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memcpy(m_x3, key+(dir==DECRYPTION?0:2*8), 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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