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Docs; minor tidy-up

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2024-02-14 13:57:53 +00:00
parent 693fb4f0b2
commit 427a5a1915
1 changed files with 7 additions and 3 deletions
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10
library/sha3.c
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@ -12,6 +12,8 @@
#include "common.h"
#if defined(MBEDTLS_SHA3_C)
/*
* These macros select manually unrolled implementations of parts of the main permutation function.
*
@ -21,6 +23,9 @@
* Rolling up the theta loop saves a lot of code-size at small performance cost. The code-size
* saving then enables us to unroll the other loops for a net code-size saving with a net
* performance win.
*
* Depending on your compiler and target, it may be beneficial to adjust these; the defaults here
* should give sensible trade-offs for gcc and clang.
*/
#undef MBEDTLS_SHA3_THETA_UNROLL //no-check-names
#define MBEDTLS_SHA3_RHO_UNROLL //no-check-names
@ -33,8 +38,6 @@
#define MBEDTLS_SHA3_CHI_UNROLL //no-check-names
#endif
#if defined(MBEDTLS_SHA3_C)
#include "mbedtls/sha3.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/error.h"
@ -164,7 +167,8 @@ static void keccak_f1600(mbedtls_sha3_context *ctx)
/* Chi */
#if !defined(MBEDTLS_SHA3_CHI_UNROLL) //no-check-names
for (i = 0; i <= 20; i += 5) {
lane[0] = s[i]; lane[1] = s[i + 1]; lane[2] = s[i + 2]; lane[3] = s[i + 3]; lane[4] = s[i + 4];
lane[0] = s[i]; lane[1] = s[i + 1]; lane[2] = s[i + 2];
lane[3] = s[i + 3]; lane[4] = s[i + 4];
s[i + 0] ^= (~lane[1]) & lane[2];
s[i + 1] ^= (~lane[2]) & lane[3];
s[i + 2] ^= (~lane[3]) & lane[4];