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polarssl: use a bigger sliding window when possible

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This commit is contained in:
Aurelien Jarno 2017-10-12 22:02:25 +02:00 committed by NIIBE Yutaka
parent 56fb5002bf
commit 43009f39e8
3 changed files with 18 additions and 3 deletions
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9
polarssl/library/bignum.c
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@ -1666,11 +1666,18 @@ static void mpi_montsqr( size_t n, const t_uint *np, t_uint mm, t_uint *d )
/*
* Sliding-window exponentiation: X = A^E mod N (HAC 14.85)
*/
#if MEMORY_SIZE >= 32
#define MAX_WSIZE 6
#elif MEMORY_SIZE >= 24
#define MAX_WSIZE 5
#else
#define MAX_WSIZE 4
#endif
int mpi_exp_mod( mpi *X, const mpi *A, const mpi *E, const mpi *N, mpi *_RR )
{
int ret;
size_t i = mpi_msb( E );
size_t wsize = ( i > 1024 ) ? 4 : /* Because of not enough memory. */
size_t wsize = ( i > 1024 ) ? MAX_WSIZE :
( i > 671 ) ? 6 : ( i > 239 ) ? 5 :
( i > 79 ) ? 4 : ( i > 23 ) ? 3 : 1;
size_t wbits, one = 1;

4
src/configure vendored
View File

@ -207,6 +207,7 @@ if test "$target" = "GNU_LINUX"; then
cross=""
mcu="none"
def_emulation="-DGNU_LINUX_EMULATION"
def_memory_size="-DMEMORY_SIZE=1024"
enable_hexoutput=""
libs="-lpthread"
else
@ -216,6 +217,7 @@ else
cross="arm-none-eabi-"
mcu="cortex-m3"
def_emulation=""
def_memory_size="-DMEMORY_SIZE=$MEMORY_SIZE"
enable_hexoutput=yes
libs=""
fi
@ -410,7 +412,7 @@ fi
echo "EMULATION=$emulation";
echo "CROSS=$cross";
echo "MCU=$mcu";
echo "DEFS=$use_sys3 $flash_override $def_emulation";
echo "DEFS=$use_sys3 $flash_override $def_emulation $def_memory_size";
echo "LDSCRIPT=$ldscript";
echo "LIBS=$libs";
echo "$DEBUG_MAKE_OPTION";

8
src/stack-def.h
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@ -1,12 +1,18 @@
#ifdef GNU_LINUX_EMULATION
#define SIZE_1 4096
#define SIZE_2 4096
#define SIZE_3 (4 * 4096)
#define SIZE_3 (5 * 4096)
#else
#define SIZE_0 0x0100 /* Main */
#define SIZE_1 0x01a0 /* CCID */
#define SIZE_2 0x0180 /* RNG */
#if MEMORY_SIZE >= 32
#define SIZE_3 0x4640 /* openpgp-card */
#elif MEMORY_SIZE >= 24
#define SIZE_3 0x2640 /* openpgp-card */
#else
#define SIZE_3 0x1640 /* openpgp-card */
#endif
#define SIZE_4 0x0000 /* --- */
#define SIZE_5 0x0200 /* msc */
#define SIZE_6 0x00c0 /* timer (cir) */