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reuse intermediate multiplication values when decrypting; speeds up decryption in the RIJNDAEL_GENERATE_VALUES case by 60%. (todo: something similar with RIJNDAEL_GENERATE_VALUES_MACRO)

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ian.mcgreer%sun.com 2001-10-08 19:06:31 +00:00
Родитель 61d7a561ca
Коммит 81ac4b6fb1
1 изменённых файлов: 64 добавлений и 12 удалений
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76
security/nss/lib/freebl/rijndael.c
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@ -30,7 +30,7 @@
* may use your version of this file under either the MPL or the
* GPL.
*
* $Id: rijndael.c,v 1.7 2001-10-08 16:11:51 ian.mcgreer%sun.com Exp $
* $Id: rijndael.c,v 1.8 2001-10-08 19:06:31 ian.mcgreer%sun.com Exp $
*/
#include "prinit.h"
@ -212,9 +212,46 @@ PRUint8 gfm(PRUint8 a, PRUint8 b)
( WORD4( GFM09(i), GFM0D(i), GFM0B(i), GFM0E(i) ) )
/* Now choose the T-table indexing method */
#if defined(RIJNDAEL_GENERATE_VALUES) || \
defined(RIJNDAEL_GENERATE_VALUES_MACRO)
/* generate values for the tables */
#if defined(RIJNDAEL_GENERATE_VALUES)
/* generate values for the tables with a function*/
static PRUint32 gen_TInvXi(PRUint8 tx, PRUint8 i)
{
PRUint8 si01, si02, si03, si04, si08, si09, si0B, si0D, si0E;
si01 = SINV(i);
si02 = XTIME(si01);
si04 = XTIME(si02);
si08 = XTIME(si04);
si03 = si02 ^ si01;
si09 = si08 ^ si01;
si0B = si08 ^ si03;
si0D = si09 ^ si04;
si0E = si08 ^ si04 ^ si02;
switch (tx) {
case 0:
return WORD4(si0E, si09, si0D, si0B);
case 1:
return WORD4(si0B, si0E, si09, si0D);
case 2:
return WORD4(si0D, si0B, si0E, si09);
case 3:
return WORD4(si09, si0D, si0B, si0E);
}
return -1;
}
#define T0(i) G_T0(i)
#define T1(i) G_T1(i)
#define T2(i) G_T2(i)
#define T3(i) G_T3(i)
#define TInv0(i) gen_TInvXi(0, i)
#define TInv1(i) gen_TInvXi(1, i)
#define TInv2(i) gen_TInvXi(2, i)
#define TInv3(i) gen_TInvXi(3, i)
#define IMXC0(b) G_IMXC0(b)
#define IMXC1(b) G_IMXC1(b)
#define IMXC2(b) G_IMXC2(b)
#define IMXC3(b) G_IMXC3(b)
#elif defined(RIJNDAEL_GENERATE_VALUES_MACRO)
/* generate values for the tables with macros */
#define T0(i) G_T0(i)
#define T1(i) G_T1(i)
#define T2(i) G_T2(i)
@ -268,19 +305,34 @@ static PRStatus
init_rijndael_tables(void)
{
PRUint32 i;
PRUint8 si01, si02, si03, si04, si08, si09, si0B, si0D, si0E;
struct rijndael_tables_str *rts;
rts = (struct rijndael_tables_str *)
PORT_Alloc(sizeof(struct rijndael_tables_str));
if (!rts) return PR_FAILURE;
for (i=0; i<256; i++) {
rts->T0[i] = G_T0(i);
rts->T1[i] = G_T1(i);
rts->T2[i] = G_T2(i);
rts->T3[i] = G_T3(i);
rts->TInv0[i] = G_TInv0(i);
rts->TInv1[i] = G_TInv1(i);
rts->TInv2[i] = G_TInv2(i);
rts->TInv3[i] = G_TInv3(i);
/* The forward values */
si01 = SBOX(i);
si02 = XTIME(si01);
si03 = si02 ^ si01;
rts->T0[i] = WORD4(si02, si01, si01, si03);
rts->T1[i] = WORD4(si03, si02, si01, si01);
rts->T2[i] = WORD4(si01, si03, si02, si01);
rts->T3[i] = WORD4(si01, si01, si03, si02);
/* The inverse values */
si01 = SINV(i);
si02 = XTIME(si01);
si04 = XTIME(si02);
si08 = XTIME(si04);
si03 = si02 ^ si01;
si09 = si08 ^ si01;
si0B = si08 ^ si03;
si0D = si09 ^ si04;
si0E = si08 ^ si04 ^ si02;
rts->TInv0[i] = WORD4(si0E, si09, si0D, si0B);
rts->TInv1[i] = WORD4(si0B, si0E, si09, si0D);
rts->TInv2[i] = WORD4(si0D, si0B, si0E, si09);
rts->TInv3[i] = WORD4(si09, si0D, si0B, si0E);
}
/* wait until all the values are in to set */
rijndaelTables = rts;