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Merge branch 'bugfix/h2e_porting_improvement' into 'master'

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change(esp_wifi): Improve handling group parameter A in H2E

Closes IDFGH-14994 and IDFGH-14995
Closes https://github.com/espressif/esp-idf/issues/15691
Closes https://github.com/espressif/esp-idf/pull/15692

See merge request espressif/esp-idf!38319
This commit is contained in:
Kapil Gupta
2025-04-15 18:36:12 +08:00
parent 78ef080251 f025008d4e
commit 9c75d7961c
5 changed files with 200 additions and 7 deletions
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38
components/wpa_supplicant/esp_supplicant/src/crypto/crypto_mbedtls-ec.c
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@@ -1,5 +1,5 @@
/*
* SPDX-FileCopyrightText: 2015-2024 Espressif Systems (Shanghai) CO LTD
* SPDX-FileCopyrightText: 2015-2025 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
@@ -149,6 +149,42 @@ const struct crypto_bignum *crypto_ec_get_order(struct crypto_ec *e)
return (const struct crypto_bignum *) & ((mbedtls_ecp_group *)e)->N;
}
struct crypto_bignum * crypto_ec_get_a(struct crypto_ec *e)
{
int ret = -1;
struct crypto_bignum *a;
mbedtls_mpi *m_a;
mbedtls_ecp_group *grp = (mbedtls_ecp_group *)e;
if (mbedtls_ecp_get_type(grp) != MBEDTLS_ECP_TYPE_SHORT_WEIERSTRASS) {
return NULL;
}
a = crypto_bignum_init();
if (!a) {
return NULL;
}
m_a = (mbedtls_mpi *)a;
/* Handle Mbed TLS quirk.
*
* Mbed TLS default ECP implementation is using grp->A = NULL to represent A = -3 for
* Short Weierstrass curves(e.g. P-256) thus accessing A needs some tweaking.
*
* See mbedtls/ecp.h for details. */
#ifdef MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED
if (mbedtls_ecp_group_a_is_minus_3(grp)) {
MBEDTLS_MPI_CHK(mbedtls_mpi_sub_int(m_a, &grp->P, 3));
} else {
MBEDTLS_MPI_CHK(mbedtls_mpi_copy(m_a, &grp->A));
}
#else
goto cleanup;
#endif
return a;
cleanup:
crypto_bignum_deinit(a, 0);
return NULL;
}
const struct crypto_bignum * crypto_ec_get_b(struct crypto_ec *e)
{
return (const struct crypto_bignum *) & ((mbedtls_ecp_group *)e)->B;