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Reduce the size of mbedtls_mpi

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Reduce the size of mbedtls_mpi from 3 words to 2 on most architectures.

This also reduces the code size significantly in bignum.o and ecp_curves.o,
with negligible variations in other modules.

This removes the ability to set MBEDTLS_MPI_MAX_LIMBS to a value >=65536,
but we don't support customizing this value anyway (it's always 10000).

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2023-06-29 19:26:48 +02:00
parent 92a55bf5ea
commit 053022fe24
3 changed files with 16 additions and 8 deletions
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5
library/ecp_curves.c
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@@ -4512,12 +4512,13 @@ static const mbedtls_ecp_point brainpoolP512r1_T[32] = {
defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
/*
* Create an MPI from embedded constants
* (assumes len is an exact multiple of sizeof(mbedtls_mpi_uint))
* (assumes len is an exact multiple of sizeof(mbedtls_mpi_uint) and
* len < 1048576)
*/
static inline void ecp_mpi_load(mbedtls_mpi *X, const mbedtls_mpi_uint *p, size_t len)
{
X->s = 1;
X->n = len / sizeof(mbedtls_mpi_uint);
X->n = (unsigned short) (len / sizeof(mbedtls_mpi_uint));
X->p = (mbedtls_mpi_uint *) p;
}
#endif