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Fix RSA perf regression

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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
This commit is contained in:
Dave Rodgman 2023-05-18 14:41:06 +01:00
parent 3108645d67
commit 3b25c40f52
1 changed files with 8 additions and 2 deletions
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10
library/bignum_core.c
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@ -211,8 +211,14 @@ void mbedtls_mpi_core_cond_assign(mbedtls_mpi_uint *X,
return; return;
} }
mbedtls_ct_memcpy_if(assign, (unsigned char *) X, (unsigned char *) A, NULL, /* This function is very performance-sensitive for RSA. For this reason
limbs * sizeof(mbedtls_mpi_uint)); * we have the loop below, instead of calling mbedtls_ct_memcpy_if
* (this is more optimal since here we don't have to handle the case where
* we copy awkwardly sized data).
*/
for (size_t i = 0; i < limbs; i++) {
X[i] = mbedtls_ct_mpi_uint_if(assign, A[i], X[i]);
}
} }
void mbedtls_mpi_core_cond_swap(mbedtls_mpi_uint *X, void mbedtls_mpi_core_cond_swap(mbedtls_mpi_uint *X,