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Change the tinycrypt return values to be below 256

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Thanks to this change the produced ASM does not need an additional instruction
to place the constant value in a register, but can compare it directly.
Signed-off-by: Andrzej Kurek <andrzej.kurek@arm.com>
This commit is contained in:
Andrzej Kurek 2020-08-09 23:41:40 -04:00
parent 858e4325d2
commit e6d8db0f41
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GPG Key ID: 89A90840DC388527
1 changed files with 3 additions and 3 deletions
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6
include/tinycrypt/ecc.h
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@ -85,9 +85,9 @@ extern "C" {
/* Return values for functions, chosen with large Hamming distances between /* Return values for functions, chosen with large Hamming distances between
* them (especially to SUCESS) to mitigate the impact of fault injection * them (especially to SUCESS) to mitigate the impact of fault injection
* attacks flipping a low number of bits. */ * attacks flipping a low number of bits. */
#define UECC_SUCCESS 0x00FFAAAA #define UECC_SUCCESS 0xCD
#define UECC_FAILURE 0x75555555 #define UECC_FAILURE 0x52
#define UECC_FAULT_DETECTED 0x7aaaaaaa #define UECC_FAULT_DETECTED 0x3B
/* Word size (4 bytes considering 32-bits architectures) */ /* Word size (4 bytes considering 32-bits architectures) */
#define uECC_WORD_SIZE 4 #define uECC_WORD_SIZE 4