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Improve comments in mpi_shrink

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This commit is contained in:
Gilles Peskine 2020-01-20 21:17:43 +01:00
parent 3e9f5228c8
commit 27c15c7853
1 changed files with 2 additions and 1 deletions
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3
library/bignum.c
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@ -157,9 +157,10 @@ int mbedtls_mpi_shrink( mbedtls_mpi *X, size_t nblimbs )
if( nblimbs > MBEDTLS_MPI_MAX_LIMBS ) if( nblimbs > MBEDTLS_MPI_MAX_LIMBS )
return( MBEDTLS_ERR_MPI_ALLOC_FAILED ); return( MBEDTLS_ERR_MPI_ALLOC_FAILED );
/* Actually resize up in this case */ /* Actually resize up if there are currently fewer than nblimbs limbs. */
if( X->n <= nblimbs ) if( X->n <= nblimbs )
return( mbedtls_mpi_grow( X, nblimbs ) ); return( mbedtls_mpi_grow( X, nblimbs ) );
/* Now X->n > nblimbs >= 0. */
for( i = X->n - 1; i > 0; i-- ) for( i = X->n - 1; i > 0; i-- )
if( X->p[i] != 0 ) if( X->p[i] != 0 )