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Reorder ops in ecp_double_add_mxz() to indicate redundant local MPIs

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Signed-off-by: Hanno Becker <hanno.becker@arm.com>
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Hanno Becker 2022-01-04 07:14:07 +00:00
parent 0d629791e9
commit 376dc89519
1 changed files with 8 additions and 8 deletions
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16
library/ecp.c
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@ -2402,22 +2402,22 @@ static int ecp_double_add_mxz( const mbedtls_ecp_group *grp,
mbedtls_mpi_init( &D ); mbedtls_mpi_init( &DA ); mbedtls_mpi_init( &CB );
MPI_ECP_ADD( &A, &P->X, &P->Z );
MPI_ECP_SQR( &AA, &A );
MPI_ECP_SUB( &B, &P->X, &P->Z );
MPI_ECP_SQR( &BB, &B );
MPI_ECP_SUB( &E, &AA, &BB );
MPI_ECP_ADD( &C, &Q->X, &Q->Z );
MPI_ECP_SUB( &D, &Q->X, &Q->Z );
MPI_ECP_MUL( &DA, &D, &A );
MPI_ECP_MUL( &CB, &C, &B );
MPI_ECP_MUL( &DA, &D, &A ); /* D no longer needed */
MPI_ECP_MUL( &CB, &C, &B ); /* C no longer needed */
MPI_ECP_SQR( &AA, &A ); /* A no longer needed */
MPI_ECP_SQR( &BB, &B ); /* B no longer needed */
MPI_ECP_MUL( &R->X, &AA, &BB );
MPI_ECP_SUB( &E, &AA, &BB ); /* AA no longer needed */
MPI_ECP_MUL( &R->Z, &grp->A, &E );
MPI_ECP_ADD( &R->Z, &BB, &R->Z ); /* BB no longer needed */
MPI_ECP_ADD( &S->X, &DA, &CB );
MPI_ECP_SQR( &S->X, &S->X );
MPI_ECP_SUB( &S->Z, &DA, &CB );
MPI_ECP_SQR( &S->Z, &S->Z );
MPI_ECP_MUL( &S->Z, d, &S->Z );
MPI_ECP_MUL( &R->X, &AA, &BB );
MPI_ECP_MUL( &R->Z, &grp->A, &E );
MPI_ECP_ADD( &R->Z, &BB, &R->Z );
MPI_ECP_MUL( &R->Z, &E, &R->Z );
cleanup: