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Introduce new CT interface (retain old interface)

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman
2023-05-17 11:59:56 +01:00
parent 14bec1490f
commit 40a41d0461
4 changed files with 734 additions and 98 deletions
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30
library/constant_time.c
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@@ -22,17 +22,14 @@
* might be translated to branches by some compilers on some platforms.
*/
#include <limits.h>
#include "common.h"
#include "constant_time_internal.h"
#include "mbedtls/constant_time.h"
#include "mbedtls/error.h"
#include "mbedtls/platform_util.h"
#if defined(MBEDTLS_BIGNUM_C)
#include "mbedtls/bignum.h"
#include "bignum_core.h"
#endif
#if defined(MBEDTLS_SSL_TLS_C)
#include "ssl_misc.h"
#endif
@@ -41,10 +38,6 @@
#include "mbedtls/rsa.h"
#endif
#if defined(MBEDTLS_BASE64_C)
#include "constant_time_invasive.h"
#endif
#include <string.h>
#if defined(MBEDTLS_USE_PSA_CRYPTO)
#define PSA_TO_MBEDTLS_ERR(status) PSA_TO_MBEDTLS_ERR_LIST(status, \
@@ -62,13 +55,11 @@
* Some of these definitions could be moved into alignment.h but for now they are
* only used here.
*/
#if defined(MBEDTLS_EFFICIENT_UNALIGNED_ACCESS) && defined(MBEDTLS_HAVE_ASM)
#if defined(__arm__) || defined(__thumb__) || defined(__thumb2__) || defined(__aarch64__)
#define MBEDTLS_EFFICIENT_UNALIGNED_VOLATILE_ACCESS
#endif
#endif
#if defined(MBEDTLS_EFFICIENT_UNALIGNED_ACCESS) && \
(defined(MBEDTLS_CT_ARM_ASM) || defined(MBEDTLS_CT_AARCH64_ASM))
#define MBEDTLS_EFFICIENT_UNALIGNED_VOLATILE_ACCESS
#if defined(MBEDTLS_EFFICIENT_UNALIGNED_VOLATILE_ACCESS)
static inline uint32_t mbedtls_get_unaligned_volatile_uint32(volatile const unsigned char *p)
{
/* This is UB, even where it's safe:
@@ -76,14 +67,17 @@ static inline uint32_t mbedtls_get_unaligned_volatile_uint32(volatile const unsi
* so instead the same thing is expressed in assembly below.
*/
uint32_t r;
#if defined(__arm__) || defined(__thumb__) || defined(__thumb2__)
#if defined(MBEDTLS_CT_ARM_ASM)
asm volatile ("ldr %0, [%1]" : "=r" (r) : "r" (p) :);
#elif defined(__aarch64__)
#elif defined(MBEDTLS_CT_AARCH64_ASM)
asm volatile ("ldr %w0, [%1]" : "=r" (r) : "r" (p) :);
#else
#error No assembly defined for mbedtls_get_unaligned_volatile_uint32
#endif
return r;
}
#endif /* MBEDTLS_EFFICIENT_UNALIGNED_VOLATILE_ACCESS */
#endif /* defined(MBEDTLS_EFFICIENT_UNALIGNED_ACCESS) &&
(defined(MBEDTLS_CT_ARM_ASM) || defined(MBEDTLS_CT_AARCH64_ASM)) */
int mbedtls_ct_memcmp(const void *a,
const void *b,