450 lines
14 KiB
C
450 lines
14 KiB
C
/*
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* rijndael-alg.c v2.4 April '2000
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*
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* Optimised ANSI C code
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*
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* authors: v1.0: Antoon Bosselaers
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* v2.0: Vincent Rijmen, K.U.Leuven
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* v2.3: Paulo Barreto
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* v2.4: Vincent Rijmen, K.U.Leuven
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*
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* This code is placed in the public domain.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "rijndael-alg.h"
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#include "boxes.dat"
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int rijndael_KeySched(word8 k[MAXKC][4], word8 W[MAXROUNDS+1][4][4], int ROUNDS) {
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/* Calculate the necessary round keys
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* The number of calculations depends on keyBits and blockBits
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*/
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int j, r, t, rconpointer = 0;
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word8 tk[MAXKC][4];
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int KC = ROUNDS - 6;
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for (j = KC-1; j >= 0; j--) {
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*((word32*)tk[j]) = *((word32*)k[j]);
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}
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r = 0;
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t = 0;
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/* copy values into round key array */
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for (j = 0; (j < KC) && (r < ROUNDS + 1); ) {
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for (; (j < KC) && (t < 4); j++, t++) {
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*((word32*)W[r][t]) = *((word32*)tk[j]);
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}
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if (t == 4) {
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r++;
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t = 0;
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}
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}
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while (r < ROUNDS + 1) { /* while not enough round key material calculated */
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/* calculate new values */
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tk[0][0] ^= S[tk[KC-1][1]];
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tk[0][1] ^= S[tk[KC-1][2]];
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tk[0][2] ^= S[tk[KC-1][3]];
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tk[0][3] ^= S[tk[KC-1][0]];
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tk[0][0] ^= rcon[rconpointer++];
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if (KC != 8) {
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for (j = 1; j < KC; j++) {
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*((word32*)tk[j]) ^= *((word32*)tk[j-1]);
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}
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} else {
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for (j = 1; j < KC/2; j++) {
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*((word32*)tk[j]) ^= *((word32*)tk[j-1]);
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}
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tk[KC/2][0] ^= S[tk[KC/2 - 1][0]];
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tk[KC/2][1] ^= S[tk[KC/2 - 1][1]];
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tk[KC/2][2] ^= S[tk[KC/2 - 1][2]];
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tk[KC/2][3] ^= S[tk[KC/2 - 1][3]];
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for (j = KC/2 + 1; j < KC; j++) {
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*((word32*)tk[j]) ^= *((word32*)tk[j-1]);
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}
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}
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/* copy values into round key array */
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for (j = 0; (j < KC) && (r < ROUNDS + 1); ) {
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for (; (j < KC) && (t < 4); j++, t++) {
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*((word32*)W[r][t]) = *((word32*)tk[j]);
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}
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if (t == 4) {
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r++;
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t = 0;
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}
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}
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}
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return 0;
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}
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int rijndael_KeyEncToDec(word8 W[MAXROUNDS+1][4][4], int ROUNDS) {
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int r;
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word8 *w;
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for (r = 1; r < ROUNDS; r++) {
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w = W[r][0];
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*((word32*)w) =
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*((word32*)U1[w[0]])
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^ *((word32*)U2[w[1]])
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^ *((word32*)U3[w[2]])
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^ *((word32*)U4[w[3]]);
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w = W[r][1];
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*((word32*)w) =
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*((word32*)U1[w[0]])
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^ *((word32*)U2[w[1]])
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^ *((word32*)U3[w[2]])
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^ *((word32*)U4[w[3]]);
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w = W[r][2];
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*((word32*)w) =
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*((word32*)U1[w[0]])
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^ *((word32*)U2[w[1]])
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^ *((word32*)U3[w[2]])
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^ *((word32*)U4[w[3]]);
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w = W[r][3];
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*((word32*)w) =
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*((word32*)U1[w[0]])
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^ *((word32*)U2[w[1]])
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^ *((word32*)U3[w[2]])
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^ *((word32*)U4[w[3]]);
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}
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return 0;
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}
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/**
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* Encrypt a single block.
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*/
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int rijndael_Encrypt(const void *va, void *vb, word8 rk[MAXROUNDS+1][4][4], int ROUNDS) {
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const word8 *a = va;
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word8 *b = vb;
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int r;
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word8 temp[4][4];
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*((word32*)temp[0]) = *((word32*)(a )) ^ *((word32*)rk[0][0]);
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*((word32*)temp[1]) = *((word32*)(a+ 4)) ^ *((word32*)rk[0][1]);
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*((word32*)temp[2]) = *((word32*)(a+ 8)) ^ *((word32*)rk[0][2]);
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*((word32*)temp[3]) = *((word32*)(a+12)) ^ *((word32*)rk[0][3]);
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*((word32*)(b )) = *((word32*)T1[temp[0][0]])
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^ *((word32*)T2[temp[1][1]])
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^ *((word32*)T3[temp[2][2]])
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^ *((word32*)T4[temp[3][3]]);
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*((word32*)(b + 4)) = *((word32*)T1[temp[1][0]])
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^ *((word32*)T2[temp[2][1]])
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^ *((word32*)T3[temp[3][2]])
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^ *((word32*)T4[temp[0][3]]);
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*((word32*)(b + 8)) = *((word32*)T1[temp[2][0]])
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^ *((word32*)T2[temp[3][1]])
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^ *((word32*)T3[temp[0][2]])
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^ *((word32*)T4[temp[1][3]]);
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*((word32*)(b +12)) = *((word32*)T1[temp[3][0]])
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^ *((word32*)T2[temp[0][1]])
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^ *((word32*)T3[temp[1][2]])
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^ *((word32*)T4[temp[2][3]]);
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for (r = 1; r < ROUNDS-1; r++) {
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*((word32*)temp[0]) = *((word32*)(b )) ^ *((word32*)rk[r][0]);
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*((word32*)temp[1]) = *((word32*)(b+ 4)) ^ *((word32*)rk[r][1]);
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*((word32*)temp[2]) = *((word32*)(b+ 8)) ^ *((word32*)rk[r][2]);
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*((word32*)temp[3]) = *((word32*)(b+12)) ^ *((word32*)rk[r][3]);
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*((word32*)(b )) = *((word32*)T1[temp[0][0]])
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^ *((word32*)T2[temp[1][1]])
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^ *((word32*)T3[temp[2][2]])
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^ *((word32*)T4[temp[3][3]]);
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*((word32*)(b + 4)) = *((word32*)T1[temp[1][0]])
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^ *((word32*)T2[temp[2][1]])
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^ *((word32*)T3[temp[3][2]])
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^ *((word32*)T4[temp[0][3]]);
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*((word32*)(b + 8)) = *((word32*)T1[temp[2][0]])
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^ *((word32*)T2[temp[3][1]])
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^ *((word32*)T3[temp[0][2]])
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^ *((word32*)T4[temp[1][3]]);
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*((word32*)(b +12)) = *((word32*)T1[temp[3][0]])
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^ *((word32*)T2[temp[0][1]])
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^ *((word32*)T3[temp[1][2]])
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^ *((word32*)T4[temp[2][3]]);
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}
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/* last round is special */
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*((word32*)temp[0]) = *((word32*)(b )) ^ *((word32*)rk[ROUNDS-1][0]);
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*((word32*)temp[1]) = *((word32*)(b+ 4)) ^ *((word32*)rk[ROUNDS-1][1]);
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*((word32*)temp[2]) = *((word32*)(b+ 8)) ^ *((word32*)rk[ROUNDS-1][2]);
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*((word32*)temp[3]) = *((word32*)(b+12)) ^ *((word32*)rk[ROUNDS-1][3]);
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b[ 0] = T1[temp[0][0]][1];
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b[ 1] = T1[temp[1][1]][1];
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b[ 2] = T1[temp[2][2]][1];
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b[ 3] = T1[temp[3][3]][1];
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b[ 4] = T1[temp[1][0]][1];
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b[ 5] = T1[temp[2][1]][1];
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b[ 6] = T1[temp[3][2]][1];
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b[ 7] = T1[temp[0][3]][1];
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b[ 8] = T1[temp[2][0]][1];
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b[ 9] = T1[temp[3][1]][1];
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b[10] = T1[temp[0][2]][1];
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b[11] = T1[temp[1][3]][1];
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b[12] = T1[temp[3][0]][1];
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b[13] = T1[temp[0][1]][1];
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b[14] = T1[temp[1][2]][1];
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b[15] = T1[temp[2][3]][1];
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*((word32*)(b )) ^= *((word32*)rk[ROUNDS][0]);
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*((word32*)(b+ 4)) ^= *((word32*)rk[ROUNDS][1]);
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*((word32*)(b+ 8)) ^= *((word32*)rk[ROUNDS][2]);
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*((word32*)(b+12)) ^= *((word32*)rk[ROUNDS][3]);
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return 0;
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}
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#ifdef INTERMEDIATE_VALUE_KAT
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/**
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* Encrypt only a certain number of rounds.
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* Only used in the Intermediate Value Known Answer Test.
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*/
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int rijndaelEncryptRound(word8 a[4][4], word8 rk[MAXROUNDS+1][4][4], int ROUNDS, int rounds) {
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int r;
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word8 temp[4][4];
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/* make number of rounds sane */
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if (rounds > ROUNDS) {
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rounds = ROUNDS;
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}
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*((word32*)a[0]) = *((word32*)a[0]) ^ *((word32*)rk[0][0]);
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*((word32*)a[1]) = *((word32*)a[1]) ^ *((word32*)rk[0][1]);
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*((word32*)a[2]) = *((word32*)a[2]) ^ *((word32*)rk[0][2]);
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*((word32*)a[3]) = *((word32*)a[3]) ^ *((word32*)rk[0][3]);
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for (r = 1; (r <= rounds) && (r < ROUNDS); r++) {
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*((word32*)temp[0]) = *((word32*)T1[a[0][0]])
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^ *((word32*)T2[a[1][1]])
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^ *((word32*)T3[a[2][2]])
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^ *((word32*)T4[a[3][3]]);
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*((word32*)temp[1]) = *((word32*)T1[a[1][0]])
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^ *((word32*)T2[a[2][1]])
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^ *((word32*)T3[a[3][2]])
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^ *((word32*)T4[a[0][3]]);
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*((word32*)temp[2]) = *((word32*)T1[a[2][0]])
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^ *((word32*)T2[a[3][1]])
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^ *((word32*)T3[a[0][2]])
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^ *((word32*)T4[a[1][3]]);
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*((word32*)temp[3]) = *((word32*)T1[a[3][0]])
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^ *((word32*)T2[a[0][1]])
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^ *((word32*)T3[a[1][2]])
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^ *((word32*)T4[a[2][3]]);
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*((word32*)a[0]) = *((word32*)temp[0]) ^ *((word32*)rk[r][0]);
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*((word32*)a[1]) = *((word32*)temp[1]) ^ *((word32*)rk[r][1]);
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*((word32*)a[2]) = *((word32*)temp[2]) ^ *((word32*)rk[r][2]);
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*((word32*)a[3]) = *((word32*)temp[3]) ^ *((word32*)rk[r][3]);
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}
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if (rounds == ROUNDS) {
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/* last round is special */
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temp[0][0] = T1[a[0][0]][1];
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temp[0][1] = T1[a[1][1]][1];
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temp[0][2] = T1[a[2][2]][1];
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temp[0][3] = T1[a[3][3]][1];
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temp[1][0] = T1[a[1][0]][1];
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temp[1][1] = T1[a[2][1]][1];
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temp[1][2] = T1[a[3][2]][1];
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temp[1][3] = T1[a[0][3]][1];
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temp[2][0] = T1[a[2][0]][1];
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temp[2][1] = T1[a[3][1]][1];
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temp[2][2] = T1[a[0][2]][1];
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temp[2][3] = T1[a[1][3]][1];
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temp[3][0] = T1[a[3][0]][1];
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temp[3][1] = T1[a[0][1]][1];
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temp[3][2] = T1[a[1][2]][1];
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temp[3][3] = T1[a[2][3]][1];
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*((word32*)a[0]) = *((word32*)temp[0]) ^ *((word32*)rk[ROUNDS][0]);
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*((word32*)a[1]) = *((word32*)temp[1]) ^ *((word32*)rk[ROUNDS][1]);
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*((word32*)a[2]) = *((word32*)temp[2]) ^ *((word32*)rk[ROUNDS][2]);
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*((word32*)a[3]) = *((word32*)temp[3]) ^ *((word32*)rk[ROUNDS][3]);
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}
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return 0;
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}
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#endif /* INTERMEDIATE_VALUE_KAT */
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/**
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* Decrypt a single block.
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*/
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int rijndael_Decrypt(const void *va, void *vb, word8 rk[MAXROUNDS+1][4][4], int ROUNDS) {
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const word8 *a = va;
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word8 *b = vb;
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int r;
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word8 temp[4][4];
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*((word32*)temp[0]) = *((word32*)(a )) ^ *((word32*)rk[ROUNDS][0]);
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*((word32*)temp[1]) = *((word32*)(a+ 4)) ^ *((word32*)rk[ROUNDS][1]);
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*((word32*)temp[2]) = *((word32*)(a+ 8)) ^ *((word32*)rk[ROUNDS][2]);
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*((word32*)temp[3]) = *((word32*)(a+12)) ^ *((word32*)rk[ROUNDS][3]);
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*((word32*)(b )) = *((word32*)T5[temp[0][0]])
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^ *((word32*)T6[temp[3][1]])
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^ *((word32*)T7[temp[2][2]])
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^ *((word32*)T8[temp[1][3]]);
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*((word32*)(b+ 4)) = *((word32*)T5[temp[1][0]])
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^ *((word32*)T6[temp[0][1]])
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^ *((word32*)T7[temp[3][2]])
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^ *((word32*)T8[temp[2][3]]);
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*((word32*)(b+ 8)) = *((word32*)T5[temp[2][0]])
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^ *((word32*)T6[temp[1][1]])
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^ *((word32*)T7[temp[0][2]])
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^ *((word32*)T8[temp[3][3]]);
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*((word32*)(b+12)) = *((word32*)T5[temp[3][0]])
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^ *((word32*)T6[temp[2][1]])
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^ *((word32*)T7[temp[1][2]])
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^ *((word32*)T8[temp[0][3]]);
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for (r = ROUNDS-1; r > 1; r--) {
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*((word32*)temp[0]) = *((word32*)(b )) ^ *((word32*)rk[r][0]);
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*((word32*)temp[1]) = *((word32*)(b+ 4)) ^ *((word32*)rk[r][1]);
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*((word32*)temp[2]) = *((word32*)(b+ 8)) ^ *((word32*)rk[r][2]);
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*((word32*)temp[3]) = *((word32*)(b+12)) ^ *((word32*)rk[r][3]);
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*((word32*)(b )) = *((word32*)T5[temp[0][0]])
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^ *((word32*)T6[temp[3][1]])
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^ *((word32*)T7[temp[2][2]])
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^ *((word32*)T8[temp[1][3]]);
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*((word32*)(b+ 4)) = *((word32*)T5[temp[1][0]])
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^ *((word32*)T6[temp[0][1]])
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^ *((word32*)T7[temp[3][2]])
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^ *((word32*)T8[temp[2][3]]);
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*((word32*)(b+ 8)) = *((word32*)T5[temp[2][0]])
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^ *((word32*)T6[temp[1][1]])
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^ *((word32*)T7[temp[0][2]])
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^ *((word32*)T8[temp[3][3]]);
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*((word32*)(b+12)) = *((word32*)T5[temp[3][0]])
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^ *((word32*)T6[temp[2][1]])
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^ *((word32*)T7[temp[1][2]])
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^ *((word32*)T8[temp[0][3]]);
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}
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/* last round is special */
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*((word32*)temp[0]) = *((word32*)(b )) ^ *((word32*)rk[1][0]);
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*((word32*)temp[1]) = *((word32*)(b+ 4)) ^ *((word32*)rk[1][1]);
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*((word32*)temp[2]) = *((word32*)(b+ 8)) ^ *((word32*)rk[1][2]);
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*((word32*)temp[3]) = *((word32*)(b+12)) ^ *((word32*)rk[1][3]);
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b[ 0] = S5[temp[0][0]];
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b[ 1] = S5[temp[3][1]];
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b[ 2] = S5[temp[2][2]];
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b[ 3] = S5[temp[1][3]];
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b[ 4] = S5[temp[1][0]];
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b[ 5] = S5[temp[0][1]];
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b[ 6] = S5[temp[3][2]];
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b[ 7] = S5[temp[2][3]];
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b[ 8] = S5[temp[2][0]];
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b[ 9] = S5[temp[1][1]];
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b[10] = S5[temp[0][2]];
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b[11] = S5[temp[3][3]];
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b[12] = S5[temp[3][0]];
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b[13] = S5[temp[2][1]];
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b[14] = S5[temp[1][2]];
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b[15] = S5[temp[0][3]];
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*((word32*)(b )) ^= *((word32*)rk[0][0]);
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*((word32*)(b+ 4)) ^= *((word32*)rk[0][1]);
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*((word32*)(b+ 8)) ^= *((word32*)rk[0][2]);
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*((word32*)(b+12)) ^= *((word32*)rk[0][3]);
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return 0;
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}
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#ifdef INTERMEDIATE_VALUE_KAT
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/**
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* Decrypt only a certain number of rounds.
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* Only used in the Intermediate Value Known Answer Test.
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* Operations rearranged such that the intermediate values
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* of decryption correspond with the intermediate values
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* of encryption.
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*/
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int rijndaelDecryptRound(word8 a[4][4], word8 rk[MAXROUNDS+1][4][4], int ROUNDS, int rounds) {
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int r, i;
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word8 temp[4], shift;
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/* make number of rounds sane */
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if (rounds > ROUNDS) {
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rounds = ROUNDS;
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}
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/* first round is special: */
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*(word32 *)a[0] ^= *(word32 *)rk[ROUNDS][0];
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*(word32 *)a[1] ^= *(word32 *)rk[ROUNDS][1];
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*(word32 *)a[2] ^= *(word32 *)rk[ROUNDS][2];
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*(word32 *)a[3] ^= *(word32 *)rk[ROUNDS][3];
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for (i = 0; i < 4; i++) {
|
|
a[i][0] = Si[a[i][0]];
|
|
a[i][1] = Si[a[i][1]];
|
|
a[i][2] = Si[a[i][2]];
|
|
a[i][3] = Si[a[i][3]];
|
|
}
|
|
for (i = 1; i < 4; i++) {
|
|
shift = (4 - i) & 3;
|
|
temp[0] = a[(0 + shift) & 3][i];
|
|
temp[1] = a[(1 + shift) & 3][i];
|
|
temp[2] = a[(2 + shift) & 3][i];
|
|
temp[3] = a[(3 + shift) & 3][i];
|
|
a[0][i] = temp[0];
|
|
a[1][i] = temp[1];
|
|
a[2][i] = temp[2];
|
|
a[3][i] = temp[3];
|
|
}
|
|
/* ROUNDS-1 ordinary rounds */
|
|
for (r = ROUNDS-1; r > rounds; r--) {
|
|
*(word32 *)a[0] ^= *(word32 *)rk[r][0];
|
|
*(word32 *)a[1] ^= *(word32 *)rk[r][1];
|
|
*(word32 *)a[2] ^= *(word32 *)rk[r][2];
|
|
*(word32 *)a[3] ^= *(word32 *)rk[r][3];
|
|
|
|
*((word32*)a[0]) =
|
|
*((word32*)U1[a[0][0]])
|
|
^ *((word32*)U2[a[0][1]])
|
|
^ *((word32*)U3[a[0][2]])
|
|
^ *((word32*)U4[a[0][3]]);
|
|
|
|
*((word32*)a[1]) =
|
|
*((word32*)U1[a[1][0]])
|
|
^ *((word32*)U2[a[1][1]])
|
|
^ *((word32*)U3[a[1][2]])
|
|
^ *((word32*)U4[a[1][3]]);
|
|
|
|
*((word32*)a[2]) =
|
|
*((word32*)U1[a[2][0]])
|
|
^ *((word32*)U2[a[2][1]])
|
|
^ *((word32*)U3[a[2][2]])
|
|
^ *((word32*)U4[a[2][3]]);
|
|
|
|
*((word32*)a[3]) =
|
|
*((word32*)U1[a[3][0]])
|
|
^ *((word32*)U2[a[3][1]])
|
|
^ *((word32*)U3[a[3][2]])
|
|
^ *((word32*)U4[a[3][3]]);
|
|
for (i = 0; i < 4; i++) {
|
|
a[i][0] = Si[a[i][0]];
|
|
a[i][1] = Si[a[i][1]];
|
|
a[i][2] = Si[a[i][2]];
|
|
a[i][3] = Si[a[i][3]];
|
|
}
|
|
for (i = 1; i < 4; i++) {
|
|
shift = (4 - i) & 3;
|
|
temp[0] = a[(0 + shift) & 3][i];
|
|
temp[1] = a[(1 + shift) & 3][i];
|
|
temp[2] = a[(2 + shift) & 3][i];
|
|
temp[3] = a[(3 + shift) & 3][i];
|
|
a[0][i] = temp[0];
|
|
a[1][i] = temp[1];
|
|
a[2][i] = temp[2];
|
|
a[3][i] = temp[3];
|
|
}
|
|
}
|
|
if (rounds == 0) {
|
|
/* End with the extra key addition */
|
|
*(word32 *)a[0] ^= *(word32 *)rk[0][0];
|
|
*(word32 *)a[1] ^= *(word32 *)rk[0][1];
|
|
*(word32 *)a[2] ^= *(word32 *)rk[0][2];
|
|
*(word32 *)a[3] ^= *(word32 *)rk[0][3];
|
|
}
|
|
return 0;
|
|
}
|
|
#endif /* INTERMEDIATE_VALUE_KAT */
|
|
|
|
/*
|
|
* $PchId: rijndael_alg.c,v 1.2 2001/01/10 21:57:12 philip Exp $
|
|
*/
|