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AES: masked config: increase total transfer speed by 5% by removing zeroing

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On MBEDTLS_AES_128_BIT_MASKED config the overall DTLS transfer speed can be
increased by 3..5% or so on a Cortex-M4 by removing 472 bytes worth of
buffer zeroing done on each block {en|de}cryption. The buffer zeroings
were done before overwriting them on in masking code.

Signed-off-by: Tero Jääskö <[email protected]>
This commit is contained in:
Tero Jääskö
2021-01-19 18:41:30 +02:00
parent a4ffa3c474
commit 0241f81cbc
1 changed files with 3 additions and 3 deletions
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library/aes.c
+3 -3
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@@ -1421,9 +1421,9 @@ int mbedtls_internal_aes_encrypt( mbedtls_aes_context *ctx,
uint8_t round_ctrl_table[( 14 + AES_SCA_CM_ROUNDS + 2 )];
#if defined MBEDTLS_AES_128_BIT_MASKED
uint32_t rk_masked[MBEDTLS_AES_128_EXPANDED_KEY_SIZE_IN_WORDS] = {0};
uint8_t sbox_masked[256] = {0};
uint32_t mask[10] = {0};
uint32_t rk_masked[MBEDTLS_AES_128_EXPANDED_KEY_SIZE_IN_WORDS];
uint8_t sbox_masked[256];
uint32_t mask[10];
#endif
#if defined(MBEDTLS_VALIDATE_AES_KEYS_INTEGRITY)