270 lines
12 KiB
C
270 lines
12 KiB
C
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/*********************************************************************
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* Filename: des.c
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* Author: Brad Conte (brad AT radconte.com)
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* Copyright:
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* Disclaimer: This code is presented "as is" without any guarantees.
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* Details: Implementation of the DES encryption algorithm.
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Modes of operation (such as CBC) are not included.
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The formal NIST algorithm specification can be found here:
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* http://csrc.nist.gov/publications/fips/fips46-3/fips46-3.pdf
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*********************************************************************/
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/*************************** HEADER FILES ***************************/
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#include <stdlib.h>
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#include <memory.h>
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#include "des.h"
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/****************************** MACROS ******************************/
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// Obtain bit "b" from the left and shift it "c" places from the right
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#define BITNUM(a,b,c) (((a[(b)/8] >> (7 - (b%8))) & 0x01) << (c))
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#define BITNUMINTR(a,b,c) ((((a) >> (31 - (b))) & 0x00000001) << (c))
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#define BITNUMINTL(a,b,c) ((((a) << (b)) & 0x80000000) >> (c))
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// This macro converts a 6 bit block with the S-Box row defined as the first and last
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// bits to a 6 bit block with the row defined by the first two bits.
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#define SBOXBIT(a) (((a) & 0x20) | (((a) & 0x1f) >> 1) | (((a) & 0x01) << 4))
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/**************************** VARIABLES *****************************/
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static const BYTE sbox1[64] = {
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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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};
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static const BYTE sbox2[64] = {
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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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};
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static const BYTE sbox3[64] = {
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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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};
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static const BYTE sbox4[64] = {
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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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};
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static const BYTE sbox5[64] = {
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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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};
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static const BYTE sbox6[64] = {
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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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};
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static const BYTE sbox7[64] = {
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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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};
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static const BYTE sbox8[64] = {
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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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/*********************** FUNCTION DEFINITIONS ***********************/
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// Initial (Inv)Permutation step
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void IP(WORD state[], const BYTE in[])
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{
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state[0] = BITNUM(in,57,31) | BITNUM(in,49,30) | BITNUM(in,41,29) | BITNUM(in,33,28) |
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BITNUM(in,25,27) | BITNUM(in,17,26) | BITNUM(in,9,25) | BITNUM(in,1,24) |
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BITNUM(in,59,23) | BITNUM(in,51,22) | BITNUM(in,43,21) | BITNUM(in,35,20) |
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BITNUM(in,27,19) | BITNUM(in,19,18) | BITNUM(in,11,17) | BITNUM(in,3,16) |
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BITNUM(in,61,15) | BITNUM(in,53,14) | BITNUM(in,45,13) | BITNUM(in,37,12) |
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BITNUM(in,29,11) | BITNUM(in,21,10) | BITNUM(in,13,9) | BITNUM(in,5,8) |
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BITNUM(in,63,7) | BITNUM(in,55,6) | BITNUM(in,47,5) | BITNUM(in,39,4) |
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BITNUM(in,31,3) | BITNUM(in,23,2) | BITNUM(in,15,1) | BITNUM(in,7,0);
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state[1] = BITNUM(in,56,31) | BITNUM(in,48,30) | BITNUM(in,40,29) | BITNUM(in,32,28) |
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BITNUM(in,24,27) | BITNUM(in,16,26) | BITNUM(in,8,25) | BITNUM(in,0,24) |
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BITNUM(in,58,23) | BITNUM(in,50,22) | BITNUM(in,42,21) | BITNUM(in,34,20) |
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BITNUM(in,26,19) | BITNUM(in,18,18) | BITNUM(in,10,17) | BITNUM(in,2,16) |
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BITNUM(in,60,15) | BITNUM(in,52,14) | BITNUM(in,44,13) | BITNUM(in,36,12) |
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BITNUM(in,28,11) | BITNUM(in,20,10) | BITNUM(in,12,9) | BITNUM(in,4,8) |
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BITNUM(in,62,7) | BITNUM(in,54,6) | BITNUM(in,46,5) | BITNUM(in,38,4) |
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BITNUM(in,30,3) | BITNUM(in,22,2) | BITNUM(in,14,1) | BITNUM(in,6,0);
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}
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void InvIP(WORD state[], BYTE in[])
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{
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in[0] = BITNUMINTR(state[1],7,7) | BITNUMINTR(state[0],7,6) | BITNUMINTR(state[1],15,5) |
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BITNUMINTR(state[0],15,4) | BITNUMINTR(state[1],23,3) | BITNUMINTR(state[0],23,2) |
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BITNUMINTR(state[1],31,1) | BITNUMINTR(state[0],31,0);
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in[1] = BITNUMINTR(state[1],6,7) | BITNUMINTR(state[0],6,6) | BITNUMINTR(state[1],14,5) |
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BITNUMINTR(state[0],14,4) | BITNUMINTR(state[1],22,3) | BITNUMINTR(state[0],22,2) |
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BITNUMINTR(state[1],30,1) | BITNUMINTR(state[0],30,0);
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in[2] = BITNUMINTR(state[1],5,7) | BITNUMINTR(state[0],5,6) | BITNUMINTR(state[1],13,5) |
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BITNUMINTR(state[0],13,4) | BITNUMINTR(state[1],21,3) | BITNUMINTR(state[0],21,2) |
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BITNUMINTR(state[1],29,1) | BITNUMINTR(state[0],29,0);
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in[3] = BITNUMINTR(state[1],4,7) | BITNUMINTR(state[0],4,6) | BITNUMINTR(state[1],12,5) |
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BITNUMINTR(state[0],12,4) | BITNUMINTR(state[1],20,3) | BITNUMINTR(state[0],20,2) |
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BITNUMINTR(state[1],28,1) | BITNUMINTR(state[0],28,0);
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in[4] = BITNUMINTR(state[1],3,7) | BITNUMINTR(state[0],3,6) | BITNUMINTR(state[1],11,5) |
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BITNUMINTR(state[0],11,4) | BITNUMINTR(state[1],19,3) | BITNUMINTR(state[0],19,2) |
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BITNUMINTR(state[1],27,1) | BITNUMINTR(state[0],27,0);
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in[5] = BITNUMINTR(state[1],2,7) | BITNUMINTR(state[0],2,6) | BITNUMINTR(state[1],10,5) |
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BITNUMINTR(state[0],10,4) | BITNUMINTR(state[1],18,3) | BITNUMINTR(state[0],18,2) |
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BITNUMINTR(state[1],26,1) | BITNUMINTR(state[0],26,0);
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in[6] = BITNUMINTR(state[1],1,7) | BITNUMINTR(state[0],1,6) | BITNUMINTR(state[1],9,5) |
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BITNUMINTR(state[0],9,4) | BITNUMINTR(state[1],17,3) | BITNUMINTR(state[0],17,2) |
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BITNUMINTR(state[1],25,1) | BITNUMINTR(state[0],25,0);
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in[7] = BITNUMINTR(state[1],0,7) | BITNUMINTR(state[0],0,6) | BITNUMINTR(state[1],8,5) |
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BITNUMINTR(state[0],8,4) | BITNUMINTR(state[1],16,3) | BITNUMINTR(state[0],16,2) |
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BITNUMINTR(state[1],24,1) | BITNUMINTR(state[0],24,0);
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}
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WORD f(WORD state, const BYTE key[])
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{
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BYTE lrgstate[6]; //,i;
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WORD t1,t2;
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// Expantion Permutation
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t1 = BITNUMINTL(state,31,0) | ((state & 0xf0000000) >> 1) | BITNUMINTL(state,4,5) |
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BITNUMINTL(state,3,6) | ((state & 0x0f000000) >> 3) | BITNUMINTL(state,8,11) |
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BITNUMINTL(state,7,12) | ((state & 0x00f00000) >> 5) | BITNUMINTL(state,12,17) |
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BITNUMINTL(state,11,18) | ((state & 0x000f0000) >> 7) | BITNUMINTL(state,16,23);
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t2 = BITNUMINTL(state,15,0) | ((state & 0x0000f000) << 15) | BITNUMINTL(state,20,5) |
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BITNUMINTL(state,19,6) | ((state & 0x00000f00) << 13) | BITNUMINTL(state,24,11) |
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BITNUMINTL(state,23,12) | ((state & 0x000000f0) << 11) | BITNUMINTL(state,28,17) |
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BITNUMINTL(state,27,18) | ((state & 0x0000000f) << 9) | BITNUMINTL(state,0,23);
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lrgstate[0] = (t1 >> 24) & 0x000000ff;
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lrgstate[1] = (t1 >> 16) & 0x000000ff;
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lrgstate[2] = (t1 >> 8) & 0x000000ff;
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lrgstate[3] = (t2 >> 24) & 0x000000ff;
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lrgstate[4] = (t2 >> 16) & 0x000000ff;
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lrgstate[5] = (t2 >> 8) & 0x000000ff;
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// Key XOR
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lrgstate[0] ^= key[0];
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lrgstate[1] ^= key[1];
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lrgstate[2] ^= key[2];
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lrgstate[3] ^= key[3];
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lrgstate[4] ^= key[4];
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lrgstate[5] ^= key[5];
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// S-Box Permutation
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state = (sbox1[SBOXBIT(lrgstate[0] >> 2)] << 28) |
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(sbox2[SBOXBIT(((lrgstate[0] & 0x03) << 4) | (lrgstate[1] >> 4))] << 24) |
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(sbox3[SBOXBIT(((lrgstate[1] & 0x0f) << 2) | (lrgstate[2] >> 6))] << 20) |
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(sbox4[SBOXBIT(lrgstate[2] & 0x3f)] << 16) |
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(sbox5[SBOXBIT(lrgstate[3] >> 2)] << 12) |
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(sbox6[SBOXBIT(((lrgstate[3] & 0x03) << 4) | (lrgstate[4] >> 4))] << 8) |
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(sbox7[SBOXBIT(((lrgstate[4] & 0x0f) << 2) | (lrgstate[5] >> 6))] << 4) |
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sbox8[SBOXBIT(lrgstate[5] & 0x3f)];
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// P-Box Permutation
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state = BITNUMINTL(state,15,0) | BITNUMINTL(state,6,1) | BITNUMINTL(state,19,2) |
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BITNUMINTL(state,20,3) | BITNUMINTL(state,28,4) | BITNUMINTL(state,11,5) |
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BITNUMINTL(state,27,6) | BITNUMINTL(state,16,7) | BITNUMINTL(state,0,8) |
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BITNUMINTL(state,14,9) | BITNUMINTL(state,22,10) | BITNUMINTL(state,25,11) |
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BITNUMINTL(state,4,12) | BITNUMINTL(state,17,13) | BITNUMINTL(state,30,14) |
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BITNUMINTL(state,9,15) | BITNUMINTL(state,1,16) | BITNUMINTL(state,7,17) |
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BITNUMINTL(state,23,18) | BITNUMINTL(state,13,19) | BITNUMINTL(state,31,20) |
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BITNUMINTL(state,26,21) | BITNUMINTL(state,2,22) | BITNUMINTL(state,8,23) |
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BITNUMINTL(state,18,24) | BITNUMINTL(state,12,25) | BITNUMINTL(state,29,26) |
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BITNUMINTL(state,5,27) | BITNUMINTL(state,21,28) | BITNUMINTL(state,10,29) |
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BITNUMINTL(state,3,30) | BITNUMINTL(state,24,31);
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// Return the final state value
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return(state);
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}
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void des_key_setup(const BYTE key[], BYTE schedule[][6], DES_MODE mode)
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{
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WORD i, j, to_gen, C, D;
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const WORD key_rnd_shift[16] = {1,1,2,2,2,2,2,2,1,2,2,2,2,2,2,1};
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const WORD key_perm_c[28] = {56,48,40,32,24,16,8,0,57,49,41,33,25,17,
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9,1,58,50,42,34,26,18,10,2,59,51,43,35};
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const WORD key_perm_d[28] = {62,54,46,38,30,22,14,6,61,53,45,37,29,21,
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13,5,60,52,44,36,28,20,12,4,27,19,11,3};
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const WORD key_compression[48] = {13,16,10,23,0,4,2,27,14,5,20,9,
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22,18,11,3,25,7,15,6,26,19,12,1,
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40,51,30,36,46,54,29,39,50,44,32,47,
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43,48,38,55,33,52,45,41,49,35,28,31};
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// Permutated Choice #1 (copy the key in, ignoring parity bits).
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for (i = 0, j = 31, C = 0; i < 28; ++i, --j)
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C |= BITNUM(key,key_perm_c[i],j);
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for (i = 0, j = 31, D = 0; i < 28; ++i, --j)
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D |= BITNUM(key,key_perm_d[i],j);
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// Generate the 16 subkeys.
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for (i = 0; i < 16; ++i) {
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C = ((C << key_rnd_shift[i]) | (C >> (28-key_rnd_shift[i]))) & 0xfffffff0;
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D = ((D << key_rnd_shift[i]) | (D >> (28-key_rnd_shift[i]))) & 0xfffffff0;
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// Decryption subkeys are reverse order of encryption subkeys so
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// generate them in reverse if the key schedule is for decryption useage.
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if (mode == DES_DECRYPT)
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to_gen = 15 - i;
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else /*(if mode == DES_ENCRYPT)*/
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to_gen = i;
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// Initialize the array
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for (j = 0; j < 6; ++j)
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schedule[to_gen][j] = 0;
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for (j = 0; j < 24; ++j)
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schedule[to_gen][j/8] |= BITNUMINTR(C,key_compression[j],7 - (j%8));
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for ( ; j < 48; ++j)
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schedule[to_gen][j/8] |= BITNUMINTR(D,key_compression[j] - 28,7 - (j%8));
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}
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}
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void des_crypt(const BYTE in[], BYTE out[], const BYTE key[][6])
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|
{
|
||
|
|
WORD state[2],idx,t;
|
||
|
|
|
||
|
|
IP(state,in);
|
||
|
|
|
||
|
|
for (idx=0; idx < 15; ++idx) {
|
||
|
|
t = state[1];
|
||
|
|
state[1] = f(state[1],key[idx]) ^ state[0];
|
||
|
|
state[0] = t;
|
||
|
|
}
|
||
|
|
// Perform the final loop manually as it doesn't switch sides
|
||
|
|
state[0] = f(state[1],key[15]) ^ state[0];
|
||
|
|
|
||
|
|
InvIP(state,out);
|
||
|
|
}
|
||
|
|
|
||
|
|
void three_des_key_setup(const BYTE key[], BYTE schedule[][16][6], DES_MODE mode)
|
||
|
|
{
|
||
|
|
if (mode == DES_ENCRYPT) {
|
||
|
|
des_key_setup(&key[0],schedule[0],mode);
|
||
|
|
des_key_setup(&key[8],schedule[1],!mode);
|
||
|
|
des_key_setup(&key[16],schedule[2],mode);
|
||
|
|
}
|
||
|
|
else /*if (mode == DES_DECRYPT*/ {
|
||
|
|
des_key_setup(&key[16],schedule[0],mode);
|
||
|
|
des_key_setup(&key[8],schedule[1],!mode);
|
||
|
|
des_key_setup(&key[0],schedule[2],mode);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
void three_des_crypt(const BYTE in[], BYTE out[], const BYTE key[][16][6])
|
||
|
|
{
|
||
|
|
des_crypt(in,out,key[0]);
|
||
|
|
des_crypt(out,out,key[1]);
|
||
|
|
des_crypt(out,out,key[2]);
|
||
|
|
}
|