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Faster mbedtls_zeroize for MPI

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Writes in `sizeof(mbedtls_mpi_uint)` units perform faster than plain chars, also eliminates multiplication by `ciL`
This commit is contained in:
Alexey Skalozub
2016-04-25 16:00:50 +01:00
committed by Simon Butcher
parent 8a3170571e
commit 3d53f41638
1 changed files with 5 additions and 5 deletions
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library/bignum.c
+5 -5
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@@ -59,8 +59,8 @@
#endif #endif
/* Implementation that should never be optimized out by the compiler */ /* Implementation that should never be optimized out by the compiler */
static void mbedtls_zeroize( void *v, size_t n ) { static void mbedtls_zeroize( mbedtls_mpi_uint *v, size_t n ) {
volatile unsigned char *p = v; while( n-- ) *p++ = 0; volatile mbedtls_mpi_uint *p = v; while( n-- ) *p++ = 0;
} }
#define ciL (sizeof(mbedtls_mpi_uint)) /* chars in limb */ #define ciL (sizeof(mbedtls_mpi_uint)) /* chars in limb */
@@ -99,7 +99,7 @@ void mbedtls_mpi_free( mbedtls_mpi *X )
if( X->p != NULL ) if( X->p != NULL )
{ {
mbedtls_zeroize( X->p, X->n * ciL ); mbedtls_zeroize( X->p, X->n );
mbedtls_free( X->p ); mbedtls_free( X->p );
} }
@@ -126,7 +126,7 @@ int mbedtls_mpi_grow( mbedtls_mpi *X, size_t nblimbs )
if( X->p != NULL ) if( X->p != NULL )
{ {
memcpy( p, X->p, X->n * ciL ); memcpy( p, X->p, X->n * ciL );
mbedtls_zeroize( X->p, X->n * ciL ); mbedtls_zeroize( X->p, X->n );
mbedtls_free( X->p ); mbedtls_free( X->p );
} }
@@ -164,7 +164,7 @@ int mbedtls_mpi_shrink( mbedtls_mpi *X, size_t nblimbs )
if( X->p != NULL ) if( X->p != NULL )
{ {
memcpy( p, X->p, i * ciL ); memcpy( p, X->p, i * ciL );
mbedtls_zeroize( X->p, X->n * ciL ); mbedtls_zeroize( X->p, X->n );
mbedtls_free( X->p ); mbedtls_free( X->p );
} }