Mercurial > dropbear
diff libtomcrypt/notes/etc/saferp_optimizer.c @ 285:1b9e69c058d2
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3)
to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Wed, 08 Mar 2006 13:23:58 +0000 |
| parents | |
| children | f849a5ca2efc |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libtomcrypt/notes/etc/saferp_optimizer.c Wed Mar 08 13:23:58 2006 +0000 @@ -0,0 +1,177 @@ +/* emits an optimized version of SAFER+ ... only does encrypt so far... */ + +#include <stdio.h> +#include <string.h> + +/* This is the "Armenian" Shuffle. It takes the input from b and stores it in b2 */ +#define SHUF\ + b2[0] = b[8]; b2[1] = b[11]; b2[2] = b[12]; b2[3] = b[15]; \ + b2[4] = b[2]; b2[5] = b[1]; b2[6] = b[6]; b2[7] = b[5]; \ + b2[8] = b[10]; b2[9] = b[9]; b2[10] = b[14]; b2[11] = b[13]; \ + b2[12] = b[0]; b2[13] = b[7]; b2[14] = b[4]; b2[15] = b[3]; memcpy(b, b2, sizeof(b)); + +/* This is the inverse shuffle. It takes from b and gives to b2 */ +#define iSHUF(b, b2) \ + b2[0] = b[12]; b2[1] = b[5]; b2[2] = b[4]; b2[3] = b[15]; \ + b2[4] = b[14]; b2[5] = b[7]; b2[6] = b[6]; b2[7] = b[13]; \ + b2[8] = b[0]; b2[9] = b[9]; b2[10] = b[8]; b2[11] = b[1]; \ + b2[12] = b[2]; b2[13] = b[11]; b2[14] = b[10]; b2[15] = b[3]; memcpy(b, b2, sizeof(b)); + +#define ROUND(b, i) \ + b[0] = (safer_ebox[(b[0] ^ skey->saferp.K[i][0]) & 255] + skey->saferp.K[i+1][0]) & 255; \ + b[1] = safer_lbox[(b[1] + skey->saferp.K[i][1]) & 255] ^ skey->saferp.K[i+1][1]; \ + b[2] = safer_lbox[(b[2] + skey->saferp.K[i][2]) & 255] ^ skey->saferp.K[i+1][2]; \ + b[3] = (safer_ebox[(b[3] ^ skey->saferp.K[i][3]) & 255] + skey->saferp.K[i+1][3]) & 255; \ + b[4] = (safer_ebox[(b[4] ^ skey->saferp.K[i][4]) & 255] + skey->saferp.K[i+1][4]) & 255; \ + b[5] = safer_lbox[(b[5] + skey->saferp.K[i][5]) & 255] ^ skey->saferp.K[i+1][5]; \ + b[6] = safer_lbox[(b[6] + skey->saferp.K[i][6]) & 255] ^ skey->saferp.K[i+1][6]; \ + b[7] = (safer_ebox[(b[7] ^ skey->saferp.K[i][7]) & 255] + skey->saferp.K[i+1][7]) & 255; \ + b[8] = (safer_ebox[(b[8] ^ skey->saferp.K[i][8]) & 255] + skey->saferp.K[i+1][8]) & 255; \ + b[9] = safer_lbox[(b[9] + skey->saferp.K[i][9]) & 255] ^ skey->saferp.K[i+1][9]; \ + b[10] = safer_lbox[(b[10] + skey->saferp.K[i][10]) & 255] ^ skey->saferp.K[i+1][10]; \ + b[11] = (safer_ebox[(b[11] ^ skey->saferp.K[i][11]) & 255] + skey->saferp.K[i+1][11]) & 255; \ + b[12] = (safer_ebox[(b[12] ^ skey->saferp.K[i][12]) & 255] + skey->saferp.K[i+1][12]) & 255; \ + b[13] = safer_lbox[(b[13] + skey->saferp.K[i][13]) & 255] ^ skey->saferp.K[i+1][13]; \ + b[14] = safer_lbox[(b[14] + skey->saferp.K[i][14]) & 255] ^ skey->saferp.K[i+1][14]; \ + b[15] = (safer_ebox[(b[15] ^ skey->saferp.K[i][15]) & 255] + skey->saferp.K[i+1][15]) & 255; + +int main(void) +{ + int b[16], b2[16], x, y, z; + +/* -- ENCRYPT --- */ + for (x = 0; x < 16; x++) b[x] = x; + /* emit encrypt preabmle */ +printf( +"void saferp_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)\n" +"{\n" +" int x;\n" +" unsigned char b[16];\n" +"\n" +" LTC_ARGCHK(pt != NULL);\n" +" LTC_ARGCHK(ct != NULL);\n" +" LTC_ARGCHK(skey != NULL);\n" +"\n" +" /* do eight rounds */\n" +" for (x = 0; x < 16; x++) {\n" +" b[x] = pt[x];\n" +" }\n"); + + /* do 8 rounds of ROUND; LT; */ + for (x = 0; x < 8; x++) { + /* ROUND(..., x*2) */ + for (y = 0; y < 16; y++) { +printf("b[%d] = (safer_%cbox[(b[%d] %c skey->saferp.K[%d][%d]) & 255] %c skey->saferp.K[%d][%d]) & 255;\n", + b[y], "elle"[y&3], b[y], "^++^"[y&3], x*2, y, "+^^+"[y&3], x*2+1, y); + } + + /* LT */ + for (y = 0; y < 4; y++) { +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[0], b[0], b[1], b[0], b[1]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[2], b[2], b[3], b[3], b[2]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[4], b[4], b[5], b[5], b[4]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[6], b[6], b[7], b[7], b[6]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[8], b[8], b[9], b[9], b[8]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[10], b[10], b[11], b[11], b[10]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[12], b[12], b[13], b[13], b[12]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[14], b[14], b[15], b[15], b[14]); + if (y < 3) { + SHUF; + } + } + } + +printf( +" if (skey->saferp.rounds <= 8) {\n"); +/* finish */ + for (x = 0; x < 16; x++) { + printf( +" ct[%d] = (b[%d] %c skey->saferp.K[skey->saferp.rounds*2][%d]) & 255;\n", + x, b[x], "^++^"[x&3], x); + } + printf(" return;\n }\n"); + + /* 192-bit keys */ +printf( +" /* 192-bit key? */\n" +" if (skey->saferp.rounds > 8) {\n"); + + /* do 4 rounds of ROUND; LT; */ + for (x = 8; x < 12; x++) { + /* ROUND(..., x*2) */ + for (y = 0; y < 16; y++) { +printf("b[%d] = (safer_%cbox[(b[%d] %c skey->saferp.K[%d][%d]) & 255] %c skey->saferp.K[%d][%d]) & 255;\n", + b[y], "elle"[y&3], b[y], "^++^"[y&3], x*2, y, "+^^+"[y&3], x*2+1, y); + } + + /* LT */ + for (y = 0; y < 4; y++) { +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[0], b[0], b[1], b[0], b[1]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[2], b[2], b[3], b[3], b[2]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[4], b[4], b[5], b[5], b[4]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[6], b[6], b[7], b[7], b[6]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[8], b[8], b[9], b[9], b[8]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[10], b[10], b[11], b[11], b[10]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[12], b[12], b[13], b[13], b[12]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[14], b[14], b[15], b[15], b[14]); + if (y < 3) { + SHUF; + } + } + } +printf("}\n"); + +printf( +" if (skey->saferp.rounds <= 12) {\n"); +/* finish */ + for (x = 0; x < 16; x++) { + printf( +" ct[%d] = (b[%d] %c skey->saferp.K[skey->saferp.rounds*2][%d]) & 255;\n", + x, b[x], "^++^"[x&3], x); + } + printf(" return;\n }\n"); + + /* 256-bit keys */ +printf( +" /* 256-bit key? */\n" +" if (skey->saferp.rounds > 12) {\n"); + + /* do 4 rounds of ROUND; LT; */ + for (x = 12; x < 16; x++) { + /* ROUND(..., x*2) */ + for (y = 0; y < 16; y++) { +printf("b[%d] = (safer_%cbox[(b[%d] %c skey->saferp.K[%d][%d]) & 255] %c skey->saferp.K[%d][%d]) & 255;\n", + b[y], "elle"[y&3], b[y], "^++^"[y&3], x*2, y, "+^^+"[y&3], x*2+1, y); + } + + /* LT */ + for (y = 0; y < 4; y++) { +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[0], b[0], b[1], b[0], b[1]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[2], b[2], b[3], b[3], b[2]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[4], b[4], b[5], b[5], b[4]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[6], b[6], b[7], b[7], b[6]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[8], b[8], b[9], b[9], b[8]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[10], b[10], b[11], b[11], b[10]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[12], b[12], b[13], b[13], b[12]); +printf(" b[%d] = (b[%d] + (b[%d] = (b[%d] + b[%d]) & 255)) & 255;\n", b[14], b[14], b[15], b[15], b[14]); + if (y < 3) { + SHUF; + } + } + } +/* finish */ + for (x = 0; x < 16; x++) { + printf( +" ct[%d] = (b[%d] %c skey->saferp.K[skey->saferp.rounds*2][%d]) & 255;\n", + x, b[x], "^++^"[x&3], x); + } + printf(" return;\n"); +printf(" }\n}\n\n"); + + return 0; +} + + +/* $Source: /cvs/libtom/libtomcrypt/notes/etc/saferp_optimizer.c,v $ */ +/* $Revision: 1.2 $ */ +/* $Date: 2005/05/05 14:35:58 $ */