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Make mbedtls_ct_zero non-static

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-06-12 18:19:46 +01:00
parent 2894d007d3
commit 58c80f4d92
2 changed files with 10 additions and 6 deletions
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9
library/constant_time.c
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@ -37,6 +37,15 @@
psa_generic_status_to_mbedtls) psa_generic_status_to_mbedtls)
#endif #endif
#if !defined(MBEDTLS_CT_ASM)
/*
* Define an object with the value zero, such that the compiler cannot prove that it
* has the value zero (because it is volatile, it "may be modified in ways unknown to
* the implementation").
*/
volatile mbedtls_ct_uint_t mbedtls_ct_zero = 0;
#endif
/* /*
* Define MBEDTLS_EFFICIENT_UNALIGNED_VOLATILE_ACCESS where assembly is present to * Define MBEDTLS_EFFICIENT_UNALIGNED_VOLATILE_ACCESS where assembly is present to
* perform fast unaligned access to volatile data. * perform fast unaligned access to volatile data.

7
library/constant_time_impl.h
View File

@ -73,12 +73,7 @@
*/ */
#if !defined(MBEDTLS_CT_ASM) #if !defined(MBEDTLS_CT_ASM)
/* extern volatile mbedtls_ct_uint_t mbedtls_ct_zero;
* Define an object with the value zero, such that the compiler cannot prove that it
* has the value zero (because it is volatile, it "may be modified in ways unknown to
* the implementation").
*/
static volatile mbedtls_ct_uint_t mbedtls_ct_zero = 0;
#endif #endif
static inline mbedtls_ct_uint_t mbedtls_ct_compiler_opaque(mbedtls_ct_uint_t x) static inline mbedtls_ct_uint_t mbedtls_ct_compiler_opaque(mbedtls_ct_uint_t x)