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Details in ecp_mul_mxz()

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Manuel Pégourié-Gonnard 2013-12-04 18:39:17 +01:00
parent fe0af405f9
commit 357ff65a51
2 changed files with 10 additions and 7 deletions
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11
library/ecp.c
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@ -1475,12 +1475,17 @@ static int ecp_mul_mxz( ecp_group *grp, ecp_point *R,
/* Save PX and read from P before writing to R, in case P == R */ /* Save PX and read from P before writing to R, in case P == R */
mpi_copy( &PX, &P->X ); mpi_copy( &PX, &P->X );
MPI_CHK( ecp_copy( &RP, P ) ); MPI_CHK( ecp_copy( &RP, P ) );
MPI_CHK( ecp_set_zero( R ) );
/* Set R to zero in modified x/z coordinates */
MPI_CHK( mpi_lset( &R->X, 1 ) );
MPI_CHK( mpi_lset( &R->Z, 0 ) );
mpi_free( &R->Y );
/* Randomize coordinates of the starting point */ /* Randomize coordinates of the starting point */
MPI_CHK( ecp_randomize_mxz( grp, &RP, f_rng, p_rng ) ); if( f_rng != NULL )
MPI_CHK( ecp_randomize_mxz( grp, &RP, f_rng, p_rng ) );
i = mpi_msb( m ) + 1; i = mpi_msb( m ); /* one past the (zero-based) most significant bit */
while( i-- > 0 ) while( i-- > 0 )
{ {
// TODO: no branch, and constant memory-access pattern // TODO: no branch, and constant memory-access pattern

6
tests/suites/test_suite_ecp.function
View file

@ -298,13 +298,11 @@ void ecp_test_vec_x( int id, char *dA_hex, char *xA_hex,
TEST_ASSERT( ecp_check_pubkey( &grp, &R ) == 0 ); TEST_ASSERT( ecp_check_pubkey( &grp, &R ) == 0 );
TEST_ASSERT( mpi_cmp_mpi( &R.X, &xS ) == 0 ); TEST_ASSERT( mpi_cmp_mpi( &R.X, &xS ) == 0 );
TEST_ASSERT( ecp_mul( &grp, &R, &dB, &grp.G, TEST_ASSERT( ecp_mul( &grp, &R, &dB, &grp.G, NULL, NULL ) == 0 );
&rnd_pseudo_rand, &rnd_info ) == 0 );
TEST_ASSERT( ecp_check_pubkey( &grp, &R ) == 0 ); TEST_ASSERT( ecp_check_pubkey( &grp, &R ) == 0 );
TEST_ASSERT( mpi_cmp_mpi( &R.X, &xB ) == 0 ); TEST_ASSERT( mpi_cmp_mpi( &R.X, &xB ) == 0 );
TEST_ASSERT( ecp_mul( &grp, &R, &dA, &R, TEST_ASSERT( ecp_mul( &grp, &R, &dA, &R, NULL, NULL ) == 0 );
&rnd_pseudo_rand, &rnd_info ) == 0 );
TEST_ASSERT( ecp_check_pubkey( &grp, &R ) == 0 ); TEST_ASSERT( ecp_check_pubkey( &grp, &R ) == 0 );
TEST_ASSERT( mpi_cmp_mpi( &R.X, &xS ) == 0 ); TEST_ASSERT( mpi_cmp_mpi( &R.X, &xS ) == 0 );