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Use only one limb parameter for assign

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Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
This commit is contained in:
Gabor Mezei
2022-09-26 17:26:42 +02:00
parent 81e57021c6
commit 3eff425b1a
5 changed files with 14 additions and 17 deletions
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8
library/constant_time.c
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@ -682,11 +682,17 @@ int mbedtls_mpi_safe_cond_assign( mbedtls_mpi *X,
MPI_VALIDATE_RET( X != NULL );
MPI_VALIDATE_RET( Y != NULL );
/* all-bits 1 if assign is 1, all-bits 0 if assign is 0 */
mbedtls_mpi_uint limb_mask = mbedtls_ct_mpi_uint_mask( assign );
MBEDTLS_MPI_CHK( mbedtls_mpi_grow( X, Y->n ) );
X->s = mbedtls_ct_cond_select_sign( assign, Y->s, X->s );
mbedtls_mpi_core_cond_assign( X->p, X->n, Y->p, Y->n, assign );
mbedtls_mpi_core_cond_assign( X->p, Y->p, Y->n, assign );
for( size_t i = Y->n; i < X->n; i++ )
X->p[i] &= ~limb_mask;
cleanup:
return( ret );