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Ensure mbedtls_ct_memcpy behaves correctly with 16-bit int

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-09-11 19:05:51 +01:00
parent 140d5c77d0
commit 4f26770291
1 changed files with 7 additions and 0 deletions
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7
library/constant_time.c
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@ -22,6 +22,7 @@
* might be translated to branches by some compilers on some platforms. * might be translated to branches by some compilers on some platforms.
*/ */
#include <stdint.h>
#include <limits.h> #include <limits.h>
#include "common.h" #include "common.h"
@ -120,7 +121,13 @@ int mbedtls_ct_memcmp(const void *a,
diff |= x ^ y; diff |= x ^ y;
} }
#if UINT_MAX < UINT32_MAX
/* In case the only bits set are in the top 16-bits, and would be lost
* by the conversion to 16-bit int (the smallest possible size for int). */
return (int) (diff | (diff >> 16))
#else
return (int) diff; return (int) diff;
#endif
} }
#if defined(MBEDTLS_PKCS1_V15) && defined(MBEDTLS_RSA_C) && !defined(MBEDTLS_RSA_ALT) #if defined(MBEDTLS_PKCS1_V15) && defined(MBEDTLS_RSA_C) && !defined(MBEDTLS_RSA_ALT)