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Change PK module preprocessor check on word size

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There were preprocessor directives in pk.c and pk_wrap.c that cheked
whether the bit length of size_t was greater than that of unsigned int.
However, the check relied on the MBEDTLS_HAVE_INT64 macro being defined
which is not directly related to size_t. This might result in errors in
some platforms. This change modifies the check to use the macros
SIZE_MAX and UINT_MAX instead making the code more robust.
This commit is contained in:
Andres Amaya Garcia 2017-08-04 13:32:15 +01:00
parent ab0a8042f4
commit 7c02c503ea
2 changed files with 10 additions and 11 deletions
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7
library/pk.c
View file

@ -29,8 +29,6 @@
#include "mbedtls/pk.h" #include "mbedtls/pk.h"
#include "mbedtls/pk_internal.h" #include "mbedtls/pk_internal.h"
#include "mbedtls/bignum.h"
#if defined(MBEDTLS_RSA_C) #if defined(MBEDTLS_RSA_C)
#include "mbedtls/rsa.h" #include "mbedtls/rsa.h"
#endif #endif
@ -42,6 +40,7 @@
#endif #endif
#include <limits.h> #include <limits.h>
#include <stdint.h>
/* 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( void *v, size_t n ) {
@ -213,10 +212,10 @@ int mbedtls_pk_verify_ext( mbedtls_pk_type_t type, const void *options,
int ret; int ret;
const mbedtls_pk_rsassa_pss_options *pss_opts; const mbedtls_pk_rsassa_pss_options *pss_opts;
#if defined(MBEDTLS_HAVE_INT64) #if SIZE_MAX > UINT_MAX
if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len ) if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#endif /* MBEDTLS_HAVE_INT64 */ #endif /* SIZE_MAX > UINT_MAX */
if( options == NULL ) if( options == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );

14
library/pk_wrap.c
View file

@ -30,7 +30,6 @@
/* Even if RSA not activated, for the sake of RSA-alt */ /* Even if RSA not activated, for the sake of RSA-alt */
#include "mbedtls/rsa.h" #include "mbedtls/rsa.h"
#include "mbedtls/bignum.h"
#include <string.h> #include <string.h>
@ -51,6 +50,7 @@
#endif #endif
#include <limits.h> #include <limits.h>
#include <stdint.h>
#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT) #if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
/* Implementation that should never be optimized out by the compiler */ /* Implementation that should never be optimized out by the compiler */
@ -77,10 +77,10 @@ static int rsa_verify_wrap( void *ctx, mbedtls_md_type_t md_alg,
{ {
int ret; int ret;
#if defined(MBEDTLS_HAVE_INT64) #if SIZE_MAX > UINT_MAX
if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len ) if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#endif /* MBEDTLS_HAVE_INT64 */ #endif /* SIZE_MAX > UINT_MAX */
if( sig_len < ((mbedtls_rsa_context *) ctx)->len ) if( sig_len < ((mbedtls_rsa_context *) ctx)->len )
return( MBEDTLS_ERR_RSA_VERIFY_FAILED ); return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
@ -101,10 +101,10 @@ static int rsa_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
unsigned char *sig, size_t *sig_len, unsigned char *sig, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng ) int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{ {
#if defined(MBEDTLS_HAVE_INT64) #if SIZE_MAX > UINT_MAX
if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len ) if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#endif /* MBEDTLS_HAVE_INT64 */ #endif /* SIZE_MAX > UINT_MAX */
*sig_len = ((mbedtls_rsa_context *) ctx)->len; *sig_len = ((mbedtls_rsa_context *) ctx)->len;
@ -415,10 +415,10 @@ static int rsa_alt_sign_wrap( void *ctx, mbedtls_md_type_t md_alg,
{ {
mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx; mbedtls_rsa_alt_context *rsa_alt = (mbedtls_rsa_alt_context *) ctx;
#if defined(MBEDTLS_HAVE_INT64) #if SIZE_MAX > UINT_MAX
if( UINT_MAX < hash_len ) if( UINT_MAX < hash_len )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA ); return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#endif /* MBEDTLS_HAVE_INT64 */ #endif /* SIZE_MAX > UINT_MAX */
*sig_len = rsa_alt->key_len_func( rsa_alt->key ); *sig_len = rsa_alt->key_len_func( rsa_alt->key );