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Enhance ecp_selftest

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Manuel Pégourié-Gonnard 2013-11-21 20:23:55 +01:00
parent d728350cee
commit 918148193d
1 changed files with 23 additions and 6 deletions
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29
library/ecp.c
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@ -68,10 +68,10 @@
#if defined(POLARSSL_SELF_TEST) #if defined(POLARSSL_SELF_TEST)
/* /*
* Counts of point addition and doubling operations. * Counts of point addition and doubling, and field multiplications.
* Used to test resistance of point multiplication to simple timing attacks. * Used to test resistance of point multiplication to simple timing attacks.
*/ */
unsigned long add_count, dbl_count; unsigned long add_count, dbl_count, mul_count;
#endif #endif
/* /*
@ -843,7 +843,14 @@ cleanup:
/* /*
* Reduce a mpi mod p in-place, general case, to use after mpi_mul_mpi * Reduce a mpi mod p in-place, general case, to use after mpi_mul_mpi
*/ */
#define MOD_MUL( N ) MPI_CHK( ecp_modp( &N, grp ) ) #if defined(POLARSSL_SELF_TEST)
#define INC_MUL_COUNT mul_count++;
#else
#define INC_MUL_COUNT
#endif
#define MOD_MUL( N ) do { MPI_CHK( ecp_modp( &N, grp ) ); INC_MUL_COUNT } \
while( 0 )
/* /*
* Reduce a mpi mod p in-place, to use after mpi_sub_mpi * Reduce a mpi mod p in-place, to use after mpi_sub_mpi
@ -2077,7 +2084,7 @@ int ecp_self_test( int verbose )
ecp_group grp; ecp_group grp;
ecp_point R, P; ecp_point R, P;
mpi m; mpi m;
unsigned long add_c_prev, dbl_c_prev; unsigned long add_c_prev, dbl_c_prev, mul_c_prev;
/* exponents especially adapted for secp192r1 */ /* exponents especially adapted for secp192r1 */
const char *exponents[] = const char *exponents[] =
{ {
@ -2110,6 +2117,7 @@ int ecp_self_test( int verbose )
add_count = 0; add_count = 0;
dbl_count = 0; dbl_count = 0;
mul_count = 0;
MPI_CHK( mpi_read_string( &m, 16, exponents[0] ) ); MPI_CHK( mpi_read_string( &m, 16, exponents[0] ) );
MPI_CHK( ecp_mul( &grp, &R, &m, &grp.G, NULL, NULL ) ); MPI_CHK( ecp_mul( &grp, &R, &m, &grp.G, NULL, NULL ) );
@ -2117,13 +2125,17 @@ int ecp_self_test( int verbose )
{ {
add_c_prev = add_count; add_c_prev = add_count;
dbl_c_prev = dbl_count; dbl_c_prev = dbl_count;
mul_c_prev = mul_count;
add_count = 0; add_count = 0;
dbl_count = 0; dbl_count = 0;
mul_count = 0;
MPI_CHK( mpi_read_string( &m, 16, exponents[i] ) ); MPI_CHK( mpi_read_string( &m, 16, exponents[i] ) );
MPI_CHK( ecp_mul( &grp, &R, &m, &grp.G, NULL, NULL ) ); MPI_CHK( ecp_mul( &grp, &R, &m, &grp.G, NULL, NULL ) );
if( add_count != add_c_prev || dbl_count != dbl_c_prev ) if( add_count != add_c_prev ||
dbl_count != dbl_c_prev ||
mul_count != mul_c_prev )
{ {
if( verbose != 0 ) if( verbose != 0 )
printf( "failed (%zu)\n", i ); printf( "failed (%zu)\n", i );
@ -2142,6 +2154,7 @@ int ecp_self_test( int verbose )
add_count = 0; add_count = 0;
dbl_count = 0; dbl_count = 0;
mul_count = 0;
MPI_CHK( mpi_read_string( &m, 16, exponents[0] ) ); MPI_CHK( mpi_read_string( &m, 16, exponents[0] ) );
MPI_CHK( ecp_mul( &grp, &R, &m, &P, NULL, NULL ) ); MPI_CHK( ecp_mul( &grp, &R, &m, &P, NULL, NULL ) );
@ -2149,13 +2162,17 @@ int ecp_self_test( int verbose )
{ {
add_c_prev = add_count; add_c_prev = add_count;
dbl_c_prev = dbl_count; dbl_c_prev = dbl_count;
mul_c_prev = mul_count;
add_count = 0; add_count = 0;
dbl_count = 0; dbl_count = 0;
mul_count = 0;
MPI_CHK( mpi_read_string( &m, 16, exponents[i] ) ); MPI_CHK( mpi_read_string( &m, 16, exponents[i] ) );
MPI_CHK( ecp_mul( &grp, &R, &m, &P, NULL, NULL ) ); MPI_CHK( ecp_mul( &grp, &R, &m, &P, NULL, NULL ) );
if( add_count != add_c_prev || dbl_count != dbl_c_prev ) if( add_count != add_c_prev ||
dbl_count != dbl_c_prev ||
mul_count != mul_c_prev )
{ {
if( verbose != 0 ) if( verbose != 0 )
printf( "failed (%zu)\n", i ); printf( "failed (%zu)\n", i );