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Multiplication by negative is now forbidden

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Manuel Pégourié-Gonnard 2012-11-11 14:33:59 +01:00 committed by Paul Bakker
parent 8433824d5f
commit 4bdd47d2cb
4 changed files with 29 additions and 20 deletions
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1
include/polarssl/ecp.h
View file

@ -201,6 +201,7 @@ int ecp_add( const ecp_group *grp, ecp_point *R,
*
* \return 0 if successful,
* POLARSSL_ERR_MPI_MALLOC_FAILED if memory allocation failed
* POLARSSL_ERR_ECP_GENERIC if m < 0
*/
int ecp_mul( const ecp_group *grp, ecp_point *R,
const mpi *m, const ecp_point *P );

13
library/ecp.c
View file

@ -709,19 +709,24 @@ cleanup:
}
/*
* Integer multiplication: R = m * P (GECC 5.7, SPA-resistant variant)
* Integer multiplication: R = m * P (GECC 5.7, SPA-resistant)
*/
int ecp_mul( const ecp_group *grp, ecp_point *R,
const mpi *m, const ecp_point *P )
{
int ret;
int ret, cmp;
size_t pos;
ecp_ptjac Q[2];
cmp = mpi_cmp_int( m, 0 );
if( cmp < 0 )
return( POLARSSL_ERR_ECP_GENERIC );
/*
* The general method works only for m >= 1
* The general method works only for m != 0
*/
if( mpi_cmp_int( m, 0 ) == 0 ) {
if( cmp == 0 ) {
ecp_set_zero( R );
return( 0 );
}

31
tests/suites/test_suite_ecp.data
View file

@ -22,47 +22,50 @@ ecp_small_add:0:"37":"31":0:"37":"31":0:21:32
ECP small addition #8
ecp_small_add:0:"14":"11":0:"14":"11":0:27:30
ECP small multiplication negative
ecp_small_mul:-1:0:0:0:POLARSSL_ERR_ECP_GENERIC
ECP small multiplication #0
ecp_small_mul:0:1:0:0
ecp_small_mul:0:1:0:0:0
ECP small multiplication #1
ecp_small_mul:1:0:17:42
ecp_small_mul:1:0:17:42:0
ECP small multiplication #2
ecp_small_mul:2:0:20:01
ecp_small_mul:2:0:20:01:0
ECP small multiplication #3
ecp_small_mul:3:0:14:11
ecp_small_mul:3:0:14:11:0
ECP small multiplication #4
ecp_small_mul:4:0:34:33
ecp_small_mul:4:0:34:33:0
ECP small multiplication #5
ecp_small_mul:5:0:21:32
ecp_small_mul:5:0:21:32:0
ECP small multiplication #6
ecp_small_mul:6:0:27:30
ecp_small_mul:6:0:27:30:0
ECP small multiplication #7
ecp_small_mul:7:0:27:17
ecp_small_mul:7:0:27:17:0
ECP small multiplication #8
ecp_small_mul:8:0:21:15
ecp_small_mul:8:0:21:15:0
ECP small multiplication #9
ecp_small_mul:9:0:34:14
ecp_small_mul:9:0:34:14:0
ECP small multiplication #10
ecp_small_mul:10:0:14:36
ecp_small_mul:10:0:14:36:0
ECP small multiplication #11
ecp_small_mul:11:0:20:46
ecp_small_mul:11:0:20:46:0
ECP small multiplication #12
ecp_small_mul:12:0:17:05
ecp_small_mul:12:0:17:05:0
ECP small multiplication #13
ecp_small_mul:13:1:0:0
ecp_small_mul:13:1:0:0:0
ECP mod p192 readable
ecp_fast_mod:SECP192R1:"000000000000010500000000000001040000000000000103000000000000010200000000000001010000000000000100"

4
tests/suites/test_suite_ecp.function
View file

@ -54,7 +54,7 @@ ecp_small_add:a_zero:x_a:y_a:b_zero:x_b:y_b:c_zero:x_c:y_c
END_CASE
BEGIN_CASE
ecp_small_mul:m:r_zero:x_r:y_r
ecp_small_mul:m:r_zero:x_r:y_r:ret
{
ecp_group grp;
ecp_point R;
@ -69,7 +69,7 @@ ecp_small_mul:m:r_zero:x_r:y_r
TEST_ASSERT( mpi_lset( &m, {m} ) == 0 );
TEST_ASSERT( ecp_mul( &grp, &R, &m, &grp.G ) == 0 );
TEST_ASSERT( ecp_mul( &grp, &R, &m, &grp.G ) == {ret} );
if( {r_zero} )
TEST_ASSERT( R.is_zero );