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test_ecp.c
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test_ecp.c
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/* mbedTLS Elliptic Curve functionality tests
*
* Focus on testing functionality where we use ESP32 hardware
* accelerated crypto features.
*
* SPDX-FileCopyrightText: 2021-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <string.h>
#include <stdio.h>
#include <stdbool.h>
#include <esp_random.h>
#include <mbedtls/entropy.h>
#include <mbedtls/ctr_drbg.h>
#include <mbedtls/ecdh.h>
#include <mbedtls/ecdsa.h>
#include <mbedtls/error.h>
#include "test_utils.h"
#include "ccomp_timer.h"
#include "unity.h"
/* Note: negative value here so that assert message prints a grep-able
error hex value (mbedTLS uses -N for error codes) */
#define TEST_ASSERT_MBEDTLS_OK(X) TEST_ASSERT_EQUAL_HEX32(0, -(X))
/* TODO: Currently MBEDTLS_ECDH_LEGACY_CONTEXT is enabled by default
* when MBEDTLS_ECP_RESTARTABLE is enabled.
* This is a temporary workaround to allow that.
*
* The legacy option is soon going to be removed in future mbedtls
* versions and this workaround will be removed once the appropriate
* solution is available.
*/
#ifdef CONFIG_MBEDTLS_ECDH_LEGACY_CONTEXT
#define ACCESS_ECDH(S, var) S.MBEDTLS_PRIVATE(var)
#else
#define ACCESS_ECDH(S, var) S.MBEDTLS_PRIVATE(ctx).MBEDTLS_PRIVATE(mbed_ecdh).MBEDTLS_PRIVATE(var)
#endif
TEST_CASE("mbedtls ECDH Generate Key", "[mbedtls]")
{
mbedtls_ecdh_context ctx;
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_ecdh_init(&ctx);
mbedtls_ctr_drbg_init(&ctr_drbg);
mbedtls_entropy_init(&entropy);
TEST_ASSERT_MBEDTLS_OK( mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy, NULL, 0) );
TEST_ASSERT_MBEDTLS_OK( mbedtls_ecp_group_load(ACCESS_ECDH(&ctx, grp), MBEDTLS_ECP_DP_CURVE25519) );
TEST_ASSERT_MBEDTLS_OK( mbedtls_ecdh_gen_public(ACCESS_ECDH(&ctx, grp), ACCESS_ECDH(&ctx, d), ACCESS_ECDH(&ctx, Q),
mbedtls_ctr_drbg_random, &ctr_drbg ) );
mbedtls_ecdh_free(&ctx);
mbedtls_ctr_drbg_free(&ctr_drbg);
mbedtls_entropy_free(&entropy);
}
TEST_CASE("mbedtls ECP self-tests", "[mbedtls]")
{
TEST_ASSERT_EQUAL(0, mbedtls_ecp_self_test(1));
}
TEST_CASE("mbedtls ECP mul w/ koblitz", "[mbedtls]")
{
/* Test case code via https://github.com/espressif/esp-idf/issues/1556 */
mbedtls_entropy_context ctxEntropy;
mbedtls_ctr_drbg_context ctxRandom;
mbedtls_ecdsa_context ctxECDSA;
const char* pers = "myecdsa";
mbedtls_entropy_init(&ctxEntropy);
mbedtls_ctr_drbg_init(&ctxRandom);
TEST_ASSERT_MBEDTLS_OK( mbedtls_ctr_drbg_seed(&ctxRandom, mbedtls_entropy_func, &ctxEntropy,
(const unsigned char*) pers, strlen(pers)) );
mbedtls_ecdsa_init(&ctxECDSA);
TEST_ASSERT_MBEDTLS_OK( mbedtls_ecdsa_genkey(&ctxECDSA, MBEDTLS_ECP_DP_SECP256K1,
mbedtls_ctr_drbg_random, &ctxRandom) );
TEST_ASSERT_MBEDTLS_OK(mbedtls_ecp_mul(&ctxECDSA.MBEDTLS_PRIVATE(grp), &ctxECDSA.MBEDTLS_PRIVATE(Q),
&ctxECDSA.MBEDTLS_PRIVATE(d), &ctxECDSA.MBEDTLS_PRIVATE(grp).G,
mbedtls_ctr_drbg_random, &ctxRandom) );
mbedtls_ecdsa_free(&ctxECDSA);
mbedtls_ctr_drbg_free(&ctxRandom);
mbedtls_entropy_free(&ctxEntropy);
}
#if CONFIG_MBEDTLS_HARDWARE_ECC
#define SMALL_SCALAR 127
/*
* Coordinates and integers stored in big endian format
*/
const uint8_t ecc_p192_point_x[] = {
0x18, 0x8D, 0xA8, 0x0E, 0xB0, 0x30, 0x90, 0xF6,
0x7C, 0xBF, 0x20, 0xEB, 0x43, 0xA1, 0x88, 0x00,
0xF4, 0xFF, 0x0A, 0xFD, 0x82, 0xFF, 0x10, 0x12
};
const uint8_t ecc_p192_point_y[] = {
0x07, 0x19, 0x2B, 0x95, 0xFF, 0xC8, 0xDA, 0x78,
0x63, 0x10, 0x11, 0xED, 0x6B, 0x24, 0xCD, 0xD5,
0x73, 0xF9, 0x77, 0xA1, 0x1E, 0x79, 0x48, 0x11
};
const uint8_t ecc_p192_scalar[] = {
0x6f, 0x18, 0x34, 0xeb, 0x16, 0xb7, 0xac, 0x9f,
0x3c, 0x77, 0x71, 0xb3, 0x02, 0x30, 0x70, 0x48,
0x75, 0x87, 0xbb, 0x6f, 0x80, 0x34, 0x8d, 0x5e
};
const uint8_t ecc_p192_mul_res_x[] = {
0x3F, 0xEE, 0x6F, 0x1F, 0x99, 0xDC, 0xCB, 0x78,
0xB7, 0x47, 0x1C, 0x2A, 0xF5, 0xA0, 0xAC, 0xE6,
0xEC, 0x24, 0x82, 0x37, 0x6C, 0xC0, 0x27, 0xC5,
};
const uint8_t ecc_p192_mul_res_y[] = {
0xDF, 0xF3, 0x9E, 0x76, 0x24, 0xF4, 0xF6, 0xB4,
0xF0, 0x0A, 0x18, 0xE1, 0x0B, 0xD2, 0xD9, 0x83,
0xE8, 0x29, 0x5E, 0xD9, 0x46, 0x54, 0xC3, 0xE1
};
const uint8_t ecc_p192_small_mul_res_x[] = {
0x62, 0xBF, 0x33, 0xC1, 0x75, 0xB5, 0xEB, 0x1D,
0xBE, 0xC7, 0x15, 0x04, 0x03, 0xA7, 0xDD, 0x9D,
0x0B, 0x17, 0x9D, 0x3B, 0x06, 0x63, 0xFE, 0xD3
};
const uint8_t ecc_p192_small_mul_res_y[] = {
0xD4, 0xE9, 0x4E, 0x4D, 0x89, 0x4D, 0xB5, 0x99,
0x8A, 0xE1, 0x85, 0x81, 0x27, 0x38, 0x23, 0x32,
0x92, 0xCF, 0xE8, 0x38, 0xCA, 0x39, 0xF2, 0xE1
};
const uint8_t ecc_p256_point_x[] = {
0x6B, 0x17, 0xD1, 0xF2, 0xE1, 0x2C, 0x42, 0x47,
0xF8, 0xBC, 0xE6, 0xE5, 0x63, 0xA4, 0x40, 0xF2,
0x77, 0x03, 0x7D, 0x81, 0x2D, 0xEB, 0x33, 0xA0,
0xF4, 0xA1, 0x39, 0x45, 0xD8, 0x98, 0xC2, 0x96
};
const uint8_t ecc_p256_point_y[] = {
0x4F, 0xE3, 0x42, 0xE2, 0xFE, 0x1A, 0x7F, 0x9B,
0x8E, 0xE7, 0xEB, 0x4A, 0x7C, 0x0F, 0x9E, 0x16,
0x2B, 0xCE, 0x33, 0x57, 0x6B, 0x31, 0x5E, 0xCE,
0xCB, 0xB6, 0x40, 0x68, 0x37, 0xBF, 0x51, 0xF5
};
const uint8_t ecc_p256_scalar[] = {
0xB2, 0xC5, 0x9E, 0x92, 0x64, 0xCD, 0x5F, 0x66,
0x9E, 0xC8, 0x83, 0x6D, 0x99, 0x61, 0x18, 0x72,
0xC8, 0x60, 0x83, 0x1E, 0xE5, 0x79, 0xCC, 0x73,
0xA9, 0xB4, 0x74, 0x85, 0x70, 0x11, 0x2D, 0xA2,
};
const uint8_t ecc_p256_mul_res_x[] = {
0x26, 0x1A, 0x0F, 0xBD, 0xA5, 0xE5, 0x1E, 0xE7,
0xB3, 0xC3, 0xB7, 0x09, 0xD1, 0x4A, 0x7A, 0x2A,
0x16, 0x69, 0x4B, 0xAF, 0x76, 0x5C, 0xD4, 0x0E,
0x93, 0x57, 0xB8, 0x67, 0xF9, 0xA1, 0xE5, 0xE8
};
const uint8_t ecc_p256_mul_res_y[] = {
0xA0, 0xF4, 0x2E, 0x62, 0x36, 0x25, 0x9F, 0xE0,
0xF2, 0xA0, 0x41, 0x42, 0xD2, 0x95, 0x89, 0x41,
0x38, 0xF0, 0xEB, 0x6E, 0xA7, 0x96, 0x29, 0x24,
0xC7, 0xD4, 0x0C, 0x90, 0xA1, 0xC9, 0xD3, 0x3A
};
const uint8_t ecc_p256_small_mul_res_x[] = {
0x53, 0x4D, 0x45, 0xDB, 0x6B, 0xAC, 0xA8, 0xE2,
0xD2, 0xA5, 0xD0, 0xA7, 0x65, 0xF1, 0x60, 0x13,
0xA8, 0xD4, 0xEB, 0x58, 0xC6, 0xAA, 0xAD, 0x35,
0x67, 0xCE, 0xBD, 0xFA, 0xC4, 0x2D, 0x62, 0x3C
};
const uint8_t ecc_p256_small_mul_res_y[] = {
0xFA, 0xD6, 0x69, 0xC8, 0x9A, 0x2A, 0x54, 0xE4,
0x41, 0x54, 0x35, 0x7F, 0x99, 0x2C, 0xCE, 0xC8,
0xEE, 0xF0, 0x93, 0xE0, 0xF2, 0x3A, 0x63, 0x1D,
0x17, 0xFD, 0xF6, 0x64, 0x41, 0x9E, 0x50, 0x0C
};
static int rng_wrapper(void *ctx, unsigned char *buf, size_t len)
{
esp_fill_random(buf, len);
return 0;
}
static void test_ecp_mul(mbedtls_ecp_group_id id, const uint8_t *x_coord, const uint8_t *y_coord, const uint8_t *scalar,
const uint8_t *result_x_coord, const uint8_t *result_y_coord)
{
int64_t elapsed_time;
uint8_t x[32];
uint8_t y[32];
int size;
int ret;
mbedtls_ecp_group grp;
mbedtls_ecp_point R;
mbedtls_ecp_point P;
mbedtls_mpi m;
mbedtls_ecp_group_init(&grp);
mbedtls_ecp_point_init(&R);
mbedtls_ecp_point_init(&P);
mbedtls_mpi_init(&m);
mbedtls_ecp_group_load(&grp, id);
size = grp.pbits / 8;
if (!scalar) {
mbedtls_mpi_lset(&m, SMALL_SCALAR);
} else {
mbedtls_mpi_read_binary(&m, scalar, size);
}
mbedtls_mpi_read_binary(&P.MBEDTLS_PRIVATE(X), x_coord, size);
mbedtls_mpi_read_binary(&P.MBEDTLS_PRIVATE(Y), y_coord, size);
mbedtls_mpi_lset(&P.MBEDTLS_PRIVATE(Z), 1);
ccomp_timer_start();
ret = mbedtls_ecp_mul(&grp, &R, &m, &P, rng_wrapper, NULL);
elapsed_time = ccomp_timer_stop();
TEST_ASSERT_EQUAL(0, ret);
mbedtls_mpi_write_binary(&R.MBEDTLS_PRIVATE(X), x, mbedtls_mpi_size(&R.MBEDTLS_PRIVATE(X)));
mbedtls_mpi_write_binary(&R.MBEDTLS_PRIVATE(Y), y, mbedtls_mpi_size(&R.MBEDTLS_PRIVATE(Y)));
TEST_ASSERT_EQUAL(0, memcmp(x, result_x_coord, mbedtls_mpi_size(&R.MBEDTLS_PRIVATE(X))));
TEST_ASSERT_EQUAL(0, memcmp(y, result_y_coord, mbedtls_mpi_size(&R.MBEDTLS_PRIVATE(Y))));
if (id == MBEDTLS_ECP_DP_SECP192R1) {
TEST_PERFORMANCE_CCOMP_LESS_THAN(ECP_P192_POINT_MULTIPLY_OP, "%d us", elapsed_time);
} else if (id == MBEDTLS_ECP_DP_SECP256R1) {
TEST_PERFORMANCE_CCOMP_LESS_THAN(ECP_P256_POINT_MULTIPLY_OP, "%d us", elapsed_time);
}
mbedtls_ecp_point_free(&R);
mbedtls_ecp_point_free(&P);
mbedtls_mpi_free(&m);
mbedtls_ecp_group_free(&grp);
}
TEST_CASE("mbedtls ECP point multiply with SECP192R1", "[mbedtls]")
{
test_ecp_mul(MBEDTLS_ECP_DP_SECP192R1, ecc_p192_point_x, ecc_p192_point_y, ecc_p192_scalar,
ecc_p192_mul_res_x, ecc_p192_mul_res_y);
test_ecp_mul(MBEDTLS_ECP_DP_SECP192R1, ecc_p192_point_x, ecc_p192_point_y, NULL,
ecc_p192_small_mul_res_x, ecc_p192_small_mul_res_y);
}
TEST_CASE("mbedtls ECP point multiply with SECP256R1", "[mbedtls]")
{
test_ecp_mul(MBEDTLS_ECP_DP_SECP256R1, ecc_p256_point_x, ecc_p256_point_y, ecc_p256_scalar,
ecc_p256_mul_res_x, ecc_p256_mul_res_y);
test_ecp_mul(MBEDTLS_ECP_DP_SECP256R1, ecc_p256_point_x, ecc_p256_point_y, NULL,
ecc_p256_small_mul_res_x, ecc_p256_small_mul_res_y);
}
static void test_ecp_verify(mbedtls_ecp_group_id id, const uint8_t *x_coord, const uint8_t *y_coord)
{
int64_t elapsed_time;
int size;
int ret;
mbedtls_ecp_group grp;
mbedtls_ecp_point P;
mbedtls_ecp_group_init(&grp);
mbedtls_ecp_point_init(&P);
mbedtls_ecp_group_load(&grp, id);
size = grp.pbits / 8;
mbedtls_mpi_read_binary(&P.MBEDTLS_PRIVATE(X), x_coord, size);
mbedtls_mpi_read_binary(&P.MBEDTLS_PRIVATE(Y), y_coord, size);
mbedtls_mpi_lset(&P.MBEDTLS_PRIVATE(Z), 1);
ccomp_timer_start();
ret = mbedtls_ecp_check_pubkey(&grp, &P);
elapsed_time = ccomp_timer_stop();
TEST_ASSERT_EQUAL(0, ret);
if (id == MBEDTLS_ECP_DP_SECP192R1) {
TEST_PERFORMANCE_CCOMP_LESS_THAN(ECP_P192_POINT_VERIFY_OP, "%d us", elapsed_time);
} else if (id == MBEDTLS_ECP_DP_SECP256R1) {
TEST_PERFORMANCE_CCOMP_LESS_THAN(ECP_P256_POINT_VERIFY_OP, "%d us", elapsed_time);
}
mbedtls_ecp_point_free(&P);
mbedtls_ecp_group_free(&grp);
}
TEST_CASE("mbedtls ECP point verify with SECP192R1", "[mbedtls]")
{
test_ecp_verify(MBEDTLS_ECP_DP_SECP192R1, ecc_p192_mul_res_x, ecc_p192_mul_res_y);
}
TEST_CASE("mbedtls ECP point verify with SECP256R1", "[mbedtls]")
{
test_ecp_verify(MBEDTLS_ECP_DP_SECP256R1, ecc_p256_mul_res_x, ecc_p256_mul_res_y);
}
#endif /* CONFIG_MBEDTLS_HARDWARE_ECC */