178 lines
7.9 KiB
C
178 lines
7.9 KiB
C
/* emits an optimized version of LTC_SAFER+ ... only does encrypt so far... */
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#include <stdio.h>
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#include <string.h>
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/* This is the "Armenian" Shuffle. It takes the input from b and stores it in b2 */
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#define SHUF\
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b2[0] = b[8]; b2[1] = b[11]; b2[2] = b[12]; b2[3] = b[15]; \
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b2[4] = b[2]; b2[5] = b[1]; b2[6] = b[6]; b2[7] = b[5]; \
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b2[8] = b[10]; b2[9] = b[9]; b2[10] = b[14]; b2[11] = b[13]; \
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b2[12] = b[0]; b2[13] = b[7]; b2[14] = b[4]; b2[15] = b[3]; memcpy(b, b2, sizeof(b));
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/* This is the inverse shuffle. It takes from b and gives to b2 */
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#define iSHUF(b, b2) \
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b2[0] = b[12]; b2[1] = b[5]; b2[2] = b[4]; b2[3] = b[15]; \
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b2[4] = b[14]; b2[5] = b[7]; b2[6] = b[6]; b2[7] = b[13]; \
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b2[8] = b[0]; b2[9] = b[9]; b2[10] = b[8]; b2[11] = b[1]; \
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b2[12] = b[2]; b2[13] = b[11]; b2[14] = b[10]; b2[15] = b[3]; memcpy(b, b2, sizeof(b));
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#define ROUND(b, i) \
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b[0] = (safer_ebox[(b[0] ^ skey->saferp.K[i][0]) & 255] + skey->saferp.K[i+1][0]) & 255; \
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b[1] = safer_lbox[(b[1] + skey->saferp.K[i][1]) & 255] ^ skey->saferp.K[i+1][1]; \
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b[2] = safer_lbox[(b[2] + skey->saferp.K[i][2]) & 255] ^ skey->saferp.K[i+1][2]; \
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b[3] = (safer_ebox[(b[3] ^ skey->saferp.K[i][3]) & 255] + skey->saferp.K[i+1][3]) & 255; \
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b[4] = (safer_ebox[(b[4] ^ skey->saferp.K[i][4]) & 255] + skey->saferp.K[i+1][4]) & 255; \
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b[5] = safer_lbox[(b[5] + skey->saferp.K[i][5]) & 255] ^ skey->saferp.K[i+1][5]; \
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b[6] = safer_lbox[(b[6] + skey->saferp.K[i][6]) & 255] ^ skey->saferp.K[i+1][6]; \
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b[7] = (safer_ebox[(b[7] ^ skey->saferp.K[i][7]) & 255] + skey->saferp.K[i+1][7]) & 255; \
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b[8] = (safer_ebox[(b[8] ^ skey->saferp.K[i][8]) & 255] + skey->saferp.K[i+1][8]) & 255; \
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b[9] = safer_lbox[(b[9] + skey->saferp.K[i][9]) & 255] ^ skey->saferp.K[i+1][9]; \
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b[10] = safer_lbox[(b[10] + skey->saferp.K[i][10]) & 255] ^ skey->saferp.K[i+1][10]; \
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b[11] = (safer_ebox[(b[11] ^ skey->saferp.K[i][11]) & 255] + skey->saferp.K[i+1][11]) & 255; \
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b[12] = (safer_ebox[(b[12] ^ skey->saferp.K[i][12]) & 255] + skey->saferp.K[i+1][12]) & 255; \
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b[13] = safer_lbox[(b[13] + skey->saferp.K[i][13]) & 255] ^ skey->saferp.K[i+1][13]; \
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b[14] = safer_lbox[(b[14] + skey->saferp.K[i][14]) & 255] ^ skey->saferp.K[i+1][14]; \
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b[15] = (safer_ebox[(b[15] ^ skey->saferp.K[i][15]) & 255] + skey->saferp.K[i+1][15]) & 255;
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int main(void)
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{
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int b[16], b2[16], x, y, z;
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/* -- ENCRYPT --- */
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for (x = 0; x < 16; x++) b[x] = x;
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/* emit encrypt preabmle */
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printf(
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"void saferp_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)\n"
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"{\n"
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" int x;\n"
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" unsigned char b[16];\n"
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"\n"
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" LTC_ARGCHK(pt != NULL);\n"
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" LTC_ARGCHK(ct != NULL);\n"
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" LTC_ARGCHK(skey != NULL);\n"
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"\n"
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" /* do eight rounds */\n"
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" for (x = 0; x < 16; x++) {\n"
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" b[x] = pt[x];\n"
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" }\n");
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/* do 8 rounds of ROUND; LT; */
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for (x = 0; x < 8; x++) {
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/* ROUND(..., x*2) */
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for (y = 0; y < 16; y++) {
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printf("b[%d] = (safer_%cbox[(b[%d] %c skey->saferp.K[%d][%d]) & 255] %c skey->saferp.K[%d][%d]) & 255;\n",
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b[y], "elle"[y&3], b[y], "^++^"[y&3], x*2, y, "+^^+"[y&3], x*2+1, y);
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}
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/* LT */
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for (y = 0; y < 4; y++) {
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[0], b[0], b[1], b[0], b[1]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[2], b[2], b[3], b[3], b[2]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[4], b[4], b[5], b[5], b[4]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[6], b[6], b[7], b[7], b[6]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[8], b[8], b[9], b[9], b[8]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[10], b[10], b[11], b[11], b[10]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[12], b[12], b[13], b[13], b[12]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[14], b[14], b[15], b[15], b[14]);
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if (y < 3) {
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SHUF;
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}
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}
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}
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printf(
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" if (skey->saferp.rounds <= 8) {\n");
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/* finish */
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for (x = 0; x < 16; x++) {
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printf(
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" ct[%d] = (b[%d] %c skey->saferp.K[skey->saferp.rounds*2][%d]) & 255;\n",
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x, b[x], "^++^"[x&3], x);
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}
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printf(" return;\n }\n");
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/* 192-bit keys */
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printf(
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" /* 192-bit key? */\n"
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" if (skey->saferp.rounds > 8) {\n");
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/* do 4 rounds of ROUND; LT; */
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for (x = 8; x < 12; x++) {
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/* ROUND(..., x*2) */
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for (y = 0; y < 16; y++) {
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printf("b[%d] = (safer_%cbox[(b[%d] %c skey->saferp.K[%d][%d]) & 255] %c skey->saferp.K[%d][%d]) & 255;\n",
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b[y], "elle"[y&3], b[y], "^++^"[y&3], x*2, y, "+^^+"[y&3], x*2+1, y);
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}
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/* LT */
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for (y = 0; y < 4; y++) {
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[0], b[0], b[1], b[0], b[1]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[2], b[2], b[3], b[3], b[2]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[4], b[4], b[5], b[5], b[4]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[6], b[6], b[7], b[7], b[6]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[8], b[8], b[9], b[9], b[8]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[10], b[10], b[11], b[11], b[10]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[12], b[12], b[13], b[13], b[12]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[14], b[14], b[15], b[15], b[14]);
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if (y < 3) {
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SHUF;
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}
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}
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}
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printf("}\n");
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printf(
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" if (skey->saferp.rounds <= 12) {\n");
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/* finish */
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for (x = 0; x < 16; x++) {
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printf(
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" ct[%d] = (b[%d] %c skey->saferp.K[skey->saferp.rounds*2][%d]) & 255;\n",
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x, b[x], "^++^"[x&3], x);
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}
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printf(" return;\n }\n");
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/* 256-bit keys */
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printf(
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" /* 256-bit key? */\n"
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" if (skey->saferp.rounds > 12) {\n");
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/* do 4 rounds of ROUND; LT; */
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for (x = 12; x < 16; x++) {
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/* ROUND(..., x*2) */
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for (y = 0; y < 16; y++) {
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printf("b[%d] = (safer_%cbox[(b[%d] %c skey->saferp.K[%d][%d]) & 255] %c skey->saferp.K[%d][%d]) & 255;\n",
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b[y], "elle"[y&3], b[y], "^++^"[y&3], x*2, y, "+^^+"[y&3], x*2+1, y);
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}
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/* LT */
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for (y = 0; y < 4; y++) {
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[0], b[0], b[1], b[0], b[1]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[2], b[2], b[3], b[3], b[2]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[4], b[4], b[5], b[5], b[4]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[6], b[6], b[7], b[7], b[6]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[8], b[8], b[9], b[9], b[8]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[10], b[10], b[11], b[11], b[10]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[12], b[12], b[13], b[13], b[12]);
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printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[14], b[14], b[15], b[15], b[14]);
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if (y < 3) {
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SHUF;
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}
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}
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}
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/* finish */
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for (x = 0; x < 16; x++) {
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printf(
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" ct[%d] = (b[%d] %c skey->saferp.K[skey->saferp.rounds*2][%d]) & 255;\n",
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x, b[x], "^++^"[x&3], x);
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}
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printf(" return;\n");
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printf(" }\n}\n\n");
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return 0;
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}
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/* ref: $Format:%D$ */
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/* git commit: $Format:%H$ */
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/* commit time: $Format:%ai$ */
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