mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
124 lines
3.9 KiB
C
124 lines
3.9 KiB
C
/*
|
|
* SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#include <string.h>
|
|
#include "soc/hwcrypto_periph.h"
|
|
#include "ecc_impl.h"
|
|
|
|
/* TBD: Remove this and use proper getter/setter methods to access
|
|
* private members of EC data structures once they are available
|
|
* in mbedTLS stack */
|
|
#define MBEDTLS_ALLOW_PRIVATE_ACCESS
|
|
|
|
#include "mbedtls/ecp.h"
|
|
#include "mbedtls/platform_util.h"
|
|
|
|
#define ECP_VALIDATE_RET( cond ) \
|
|
MBEDTLS_INTERNAL_VALIDATE_RET( cond, MBEDTLS_ERR_ECP_BAD_INPUT_DATA )
|
|
#define ECP_VALIDATE( cond ) \
|
|
MBEDTLS_INTERNAL_VALIDATE( cond )
|
|
|
|
#if defined(MBEDTLS_ECP_MUL_ALT) || defined(MBEDTLS_ECP_MUL_ALT_SOFT_FALLBACK)
|
|
|
|
#define MAX_SIZE 32 // 256 bits
|
|
|
|
static int esp_mbedtls_ecp_point_multiply(const mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
|
|
const mbedtls_mpi *m, const mbedtls_ecp_point *P)
|
|
{
|
|
int ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
|
|
uint8_t x_tmp[MAX_SIZE] = {0};
|
|
uint8_t y_tmp[MAX_SIZE] = {0};
|
|
|
|
uint8_t m_le[MAX_SIZE] = {0};
|
|
ecc_point_t p_pt = {0};
|
|
ecc_point_t r_pt = {0};
|
|
|
|
p_pt.len = grp->pbits / 8;
|
|
|
|
MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary_le(&P->MBEDTLS_PRIVATE(X), p_pt.x, MAX_SIZE));
|
|
MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary_le(&P->MBEDTLS_PRIVATE(Y), p_pt.y, MAX_SIZE));
|
|
MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary_le(m, m_le, MAX_SIZE));
|
|
|
|
ret = esp_ecc_point_multiply(&p_pt, m_le, &r_pt, false);
|
|
|
|
for (int i = 0; i < MAX_SIZE; i++) {
|
|
x_tmp[MAX_SIZE - i - 1] = r_pt.x[i];
|
|
y_tmp[MAX_SIZE - i - 1] = r_pt.y[i];
|
|
}
|
|
|
|
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&R->MBEDTLS_PRIVATE(X), x_tmp, MAX_SIZE));
|
|
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&R->MBEDTLS_PRIVATE(Y), y_tmp, MAX_SIZE));
|
|
MBEDTLS_MPI_CHK(mbedtls_mpi_lset(&R->MBEDTLS_PRIVATE(Z), 1));
|
|
return ret;
|
|
|
|
cleanup:
|
|
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
|
|
}
|
|
|
|
int ecp_mul_restartable_internal( mbedtls_ecp_group *grp, mbedtls_ecp_point *R,
|
|
const mbedtls_mpi *m, const mbedtls_ecp_point *P,
|
|
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
|
|
mbedtls_ecp_restart_ctx *rs_ctx )
|
|
{
|
|
int ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
|
|
if (grp->id != MBEDTLS_ECP_DP_SECP192R1 && grp->id != MBEDTLS_ECP_DP_SECP256R1) {
|
|
#if defined(MBEDTLS_ECP_MUL_ALT_SOFT_FALLBACK)
|
|
return ecp_mul_restartable_internal_soft(grp, R, m, P, f_rng, p_rng, rs_ctx);
|
|
#else
|
|
return ret;
|
|
#endif
|
|
}
|
|
|
|
/* Common sanity checks to conform with mbedTLS return values */
|
|
MBEDTLS_MPI_CHK( mbedtls_ecp_check_privkey(grp, m) );
|
|
MBEDTLS_MPI_CHK( mbedtls_ecp_check_pubkey(grp, P) );
|
|
|
|
MBEDTLS_MPI_CHK( esp_mbedtls_ecp_point_multiply(grp, R, m, P) );
|
|
cleanup:
|
|
return( ret );
|
|
}
|
|
|
|
#endif /* defined(MBEDTLS_ECP_MUL_ALT) || defined(MBEDTLS_ECP_MUL_ALT_SOFT_FALLBACK) */
|
|
|
|
#if defined(MBEDTLS_ECP_VERIFY_ALT) || defined(MBEDTLS_ECP_VERIFY_ALT_SOFT_FALLBACK)
|
|
|
|
int mbedtls_ecp_check_pubkey( const mbedtls_ecp_group *grp,
|
|
const mbedtls_ecp_point *pt )
|
|
{
|
|
int res;
|
|
ecc_point_t point;
|
|
|
|
if (grp->id != MBEDTLS_ECP_DP_SECP192R1 && grp->id != MBEDTLS_ECP_DP_SECP256R1) {
|
|
#if defined(MBEDTLS_ECP_VERIFY_ALT_SOFT_FALLBACK)
|
|
return mbedtls_ecp_check_pubkey_soft(grp, pt);
|
|
#else
|
|
return MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
|
|
#endif
|
|
}
|
|
|
|
ECP_VALIDATE_RET( grp != NULL );
|
|
ECP_VALIDATE_RET( pt != NULL );
|
|
|
|
/* Must use affine coordinates */
|
|
if( mbedtls_mpi_cmp_int( &pt->Z, 1 ) != 0 )
|
|
return( MBEDTLS_ERR_ECP_INVALID_KEY );
|
|
|
|
mbedtls_platform_zeroize((void *)&point, sizeof(ecc_point_t));
|
|
|
|
memcpy(&point.x, pt->X.p, mbedtls_mpi_size(&pt->X));
|
|
memcpy(&point.y, pt->Y.p, mbedtls_mpi_size(&pt->Y));
|
|
|
|
point.len = grp->pbits / 8;
|
|
|
|
res = esp_ecc_point_verify(&point);
|
|
if (res == 1) {
|
|
return 0;
|
|
} else {
|
|
return MBEDTLS_ERR_ECP_INVALID_KEY;
|
|
}
|
|
}
|
|
#endif /* defined(MBEDTLS_ECP_VERIFY_ALT) || defined(MBEDTLS_ECP_VERIFY_ALT_SOFT_FALLBACK) */
|