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Zeroize stack before returning from mpi_fill_random

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This commit is contained in:
Hanno Becker 2017-10-18 12:41:30 +01:00
parent 7c8cb9c28b
commit 888071184c
1 changed files with 6 additions and 0 deletions
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6
library/bignum.c
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@ -63,6 +63,11 @@ static void mbedtls_mpi_zeroize( mbedtls_mpi_uint *v, size_t n ) {
volatile mbedtls_mpi_uint *p = v; while( n-- ) *p++ = 0; volatile mbedtls_mpi_uint *p = v; while( n-- ) *p++ = 0;
} }
/* Implementation that should never be optimized out by the compiler */
static void mbedtls_zeroize( void *v, size_t n ) {
volatile unsigned char *p = v; while( n-- ) *p++ = 0;
}
#define ciL (sizeof(mbedtls_mpi_uint)) /* chars in limb */ #define ciL (sizeof(mbedtls_mpi_uint)) /* chars in limb */
#define biL (ciL << 3) /* bits in limb */ #define biL (ciL << 3) /* bits in limb */
#define biH (ciL << 2) /* half limb size */ #define biH (ciL << 2) /* half limb size */
@ -1886,6 +1891,7 @@ int mbedtls_mpi_fill_random( mbedtls_mpi *X, size_t size,
MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( X, buf, size ) ); MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( X, buf, size ) );
cleanup: cleanup:
mbedtls_zeroize( buf, sizeof( buf ) );
return( ret ); return( ret );
} }