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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 */
mpi_copy( &PX, &P->X );
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 */
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 )
{
// TODO: no branch, and constant memory-access pattern