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ee07afa2051a1d7d8a20e46035b3cc8e4c94fc80
mbedtls/programs/ssl/ssl_test_lib.c
Valerio Setti dda0019e2e ssl_test_lib: fix rebase error 
Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
2023-07-10 10:22:51 +02:00

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/*
* Common code library for SSL test programs.
*
* In addition to the functions in this file, there is shared source code
* that cannot be compiled separately in "ssl_test_common_source.c".
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define MBEDTLS_ALLOW_PRIVATE_ACCESS
#include "ssl_test_lib.h"
#if defined(MBEDTLS_TEST_HOOKS)
#include "test/helpers.h"
#endif
#if !defined(MBEDTLS_SSL_TEST_IMPOSSIBLE)
#define ARRAY_LENGTH(x) (sizeof(x)/sizeof(x[0]))
void my_debug(void *ctx, int level,
const char *file, int line,
const char *str)
{
const char *p, *basename;
/* Extract basename from file */
for (p = basename = file; *p != '\0'; p++) {
if (*p == '/' || *p == '\\') {
basename = p + 1;
}
}
mbedtls_fprintf((FILE *) ctx, "%s:%04d: |%d| %s",
basename, line, level, str);
fflush((FILE *) ctx);
}
#if defined(MBEDTLS_HAVE_TIME)
mbedtls_time_t dummy_constant_time(mbedtls_time_t *time)
{
(void) time;
return 0x5af2a056;
}
#endif
#if !defined(MBEDTLS_TEST_USE_PSA_CRYPTO_RNG)
static int dummy_entropy(void *data, unsigned char *output, size_t len)
{
size_t i;
int ret;
(void) data;
ret = mbedtls_entropy_func(data, output, len);
for (i = 0; i < len; i++) {
//replace result with pseudo random
output[i] = (unsigned char) rand();
}
return ret;
}
#endif
void rng_init(rng_context_t *rng)
{
#if defined(MBEDTLS_TEST_USE_PSA_CRYPTO_RNG)
(void) rng;
psa_crypto_init();
#else /* !MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
#if defined(MBEDTLS_CTR_DRBG_C)
mbedtls_ctr_drbg_init(&rng->drbg);
#elif defined(MBEDTLS_HMAC_DRBG_C)
mbedtls_hmac_drbg_init(&rng->drbg);
#else
#error "No DRBG available"
#endif
mbedtls_entropy_init(&rng->entropy);
#endif /* !MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
}
int rng_seed(rng_context_t *rng, int reproducible, const char *pers)
{
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if (reproducible) {
mbedtls_fprintf(stderr,
"MBEDTLS_USE_PSA_CRYPTO does not support reproducible mode.\n");
return -1;
}
#endif
#if defined(MBEDTLS_TEST_USE_PSA_CRYPTO_RNG)
/* The PSA crypto RNG does its own seeding. */
(void) rng;
(void) pers;
if (reproducible) {
mbedtls_fprintf(stderr,
"The PSA RNG does not support reproducible mode.\n");
return -1;
}
return 0;
#else /* !MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
int (*f_entropy)(void *, unsigned char *, size_t) =
(reproducible ? dummy_entropy : mbedtls_entropy_func);
if (reproducible) {
srand(1);
}
#if defined(MBEDTLS_CTR_DRBG_C)
int ret = mbedtls_ctr_drbg_seed(&rng->drbg,
f_entropy, &rng->entropy,
(const unsigned char *) pers,
strlen(pers));
#elif defined(MBEDTLS_HMAC_DRBG_C)
#if defined(MBEDTLS_MD_CAN_SHA256)
const mbedtls_md_type_t md_type = MBEDTLS_MD_SHA256;
#elif defined(MBEDTLS_MD_CAN_SHA512)
const mbedtls_md_type_t md_type = MBEDTLS_MD_SHA512;
#else
#error "No message digest available for HMAC_DRBG"
#endif
int ret = mbedtls_hmac_drbg_seed(&rng->drbg,
mbedtls_md_info_from_type(md_type),
f_entropy, &rng->entropy,
(const unsigned char *) pers,
strlen(pers));
#else /* !defined(MBEDTLS_CTR_DRBG_C) && !defined(MBEDTLS_HMAC_DRBG_C) */
#error "No DRBG available"
#endif /* !defined(MBEDTLS_CTR_DRBG_C) && !defined(MBEDTLS_HMAC_DRBG_C) */
if (ret != 0) {
mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned -0x%x\n",
(unsigned int) -ret);
return ret;
}
#endif /* !MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
return 0;
}
void rng_free(rng_context_t *rng)
{
#if defined(MBEDTLS_TEST_USE_PSA_CRYPTO_RNG)
(void) rng;
/* Deinitialize the PSA crypto subsystem. This deactivates all PSA APIs.
* This is ok because none of our applications try to do any crypto after
* deinitializing the RNG. */
mbedtls_psa_crypto_free();
#else /* !MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
#if defined(MBEDTLS_CTR_DRBG_C)
mbedtls_ctr_drbg_free(&rng->drbg);
#elif defined(MBEDTLS_HMAC_DRBG_C)
mbedtls_hmac_drbg_free(&rng->drbg);
#else
#error "No DRBG available"
#endif
mbedtls_entropy_free(&rng->entropy);
#endif /* !MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
}
int rng_get(void *p_rng, unsigned char *output, size_t output_len)
{
#if defined(MBEDTLS_TEST_USE_PSA_CRYPTO_RNG)
(void) p_rng;
return mbedtls_psa_get_random(MBEDTLS_PSA_RANDOM_STATE,
output, output_len);
#else /* !MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
rng_context_t *rng = p_rng;
#if defined(MBEDTLS_CTR_DRBG_C)
return mbedtls_ctr_drbg_random(&rng->drbg, output, output_len);
#elif defined(MBEDTLS_HMAC_DRBG_C)
return mbedtls_hmac_drbg_random(&rng->drbg, output, output_len);
#else
#error "No DRBG available"
#endif
#endif /* !MBEDTLS_TEST_USE_PSA_CRYPTO_RNG */
}
int key_opaque_alg_parse(const char *arg, const char **alg1, const char **alg2)
{
char *separator;
if ((separator = strchr(arg, ',')) == NULL) {
return 1;
}
*separator = '\0';
*alg1 = arg;
*alg2 = separator + 1;
if (strcmp(*alg1, "rsa-sign-pkcs1") != 0 &&
strcmp(*alg1, "rsa-sign-pss") != 0 &&
strcmp(*alg1, "rsa-sign-pss-sha256") != 0 &&
strcmp(*alg1, "rsa-sign-pss-sha384") != 0 &&
strcmp(*alg1, "rsa-sign-pss-sha512") != 0 &&
strcmp(*alg1, "rsa-decrypt") != 0 &&
strcmp(*alg1, "ecdsa-sign") != 0 &&
strcmp(*alg1, "ecdh") != 0) {
return 1;
}
if (strcmp(*alg2, "rsa-sign-pkcs1") != 0 &&
strcmp(*alg2, "rsa-sign-pss") != 0 &&
strcmp(*alg1, "rsa-sign-pss-sha256") != 0 &&
strcmp(*alg1, "rsa-sign-pss-sha384") != 0 &&
strcmp(*alg1, "rsa-sign-pss-sha512") != 0 &&
strcmp(*alg2, "rsa-decrypt") != 0 &&
strcmp(*alg2, "ecdsa-sign") != 0 &&
strcmp(*alg2, "ecdh") != 0 &&
strcmp(*alg2, "none") != 0) {
return 1;
}
return 0;
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
int key_opaque_set_alg_usage(const char *alg1, const char *alg2,
psa_algorithm_t *psa_alg1,
psa_algorithm_t *psa_alg2,
psa_key_usage_t *usage,
mbedtls_pk_type_t key_type)
{
if (strcmp(alg1, "none") != 0) {
const char *algs[] = { alg1, alg2 };
psa_algorithm_t *psa_algs[] = { psa_alg1, psa_alg2 };
for (int i = 0; i < 2; i++) {
if (strcmp(algs[i], "rsa-sign-pkcs1") == 0) {
*psa_algs[i] = PSA_ALG_RSA_PKCS1V15_SIGN(PSA_ALG_ANY_HASH);
*usage |= PSA_KEY_USAGE_SIGN_HASH;
} else if (strcmp(algs[i], "rsa-sign-pss") == 0) {
*psa_algs[i] = PSA_ALG_RSA_PSS(PSA_ALG_ANY_HASH);
*usage |= PSA_KEY_USAGE_SIGN_HASH;
} else if (strcmp(algs[i], "rsa-sign-pss-sha256") == 0) {
*psa_algs[i] = PSA_ALG_RSA_PSS(PSA_ALG_SHA_256);
*usage |= PSA_KEY_USAGE_SIGN_HASH;
} else if (strcmp(algs[i], "rsa-sign-pss-sha384") == 0) {
*psa_algs[i] = PSA_ALG_RSA_PSS(PSA_ALG_SHA_384);
*usage |= PSA_KEY_USAGE_SIGN_HASH;
} else if (strcmp(algs[i], "rsa-sign-pss-sha512") == 0) {
*psa_algs[i] = PSA_ALG_RSA_PSS(PSA_ALG_SHA_512);
*usage |= PSA_KEY_USAGE_SIGN_HASH;
} else if (strcmp(algs[i], "rsa-decrypt") == 0) {
*psa_algs[i] = PSA_ALG_RSA_PKCS1V15_CRYPT;
*usage |= PSA_KEY_USAGE_DECRYPT;
} else if (strcmp(algs[i], "ecdsa-sign") == 0) {
*psa_algs[i] = PSA_ALG_ECDSA(PSA_ALG_ANY_HASH);
*usage |= PSA_KEY_USAGE_SIGN_HASH;
} else if (strcmp(algs[i], "ecdh") == 0) {
*psa_algs[i] = PSA_ALG_ECDH;
*usage |= PSA_KEY_USAGE_DERIVE;
} else if (strcmp(algs[i], "none") == 0) {
*psa_algs[i] = PSA_ALG_NONE;
}
}
} else {
if (key_type == MBEDTLS_PK_ECKEY) {
*psa_alg1 = PSA_ALG_ECDSA(PSA_ALG_ANY_HASH);
*psa_alg2 = PSA_ALG_ECDH;
*usage = PSA_KEY_USAGE_SIGN_HASH | PSA_KEY_USAGE_DERIVE;
} else if (key_type == MBEDTLS_PK_RSA) {
*psa_alg1 = PSA_ALG_RSA_PKCS1V15_SIGN(PSA_ALG_ANY_HASH);
*psa_alg2 = PSA_ALG_RSA_PSS(PSA_ALG_ANY_HASH);
*usage = PSA_KEY_USAGE_SIGN_HASH;
} else {
return 1;
}
}
return 0;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
int ca_callback(void *data, mbedtls_x509_crt const *child,
mbedtls_x509_crt **candidates)
{
int ret = 0;
mbedtls_x509_crt *ca = (mbedtls_x509_crt *) data;
mbedtls_x509_crt *first;
/* This is a test-only implementation of the CA callback
* which always returns the entire list of trusted certificates.
* Production implementations managing a large number of CAs
* should use an efficient presentation and lookup for the
* set of trusted certificates (such as a hashtable) and only
* return those trusted certificates which satisfy basic
* parental checks, such as the matching of child `Issuer`
* and parent `Subject` field or matching key identifiers. */
((void) child);
first = mbedtls_calloc(1, sizeof(mbedtls_x509_crt));
if (first == NULL) {
ret = -1;
goto exit;
}
mbedtls_x509_crt_init(first);
if (mbedtls_x509_crt_parse_der(first, ca->raw.p, ca->raw.len) != 0) {
ret = -1;
goto exit;
}
while (ca->next != NULL) {
ca = ca->next;
if (mbedtls_x509_crt_parse_der(first, ca->raw.p, ca->raw.len) != 0) {
ret = -1;
goto exit;
}
}
exit:
if (ret != 0) {
mbedtls_x509_crt_free(first);
mbedtls_free(first);
first = NULL;
}
*candidates = first;
return ret;
}
#endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
int delayed_recv(void *ctx, unsigned char *buf, size_t len)
{
static int first_try = 1;
int ret;
if (first_try) {
first_try = 0;
return MBEDTLS_ERR_SSL_WANT_READ;
}
ret = mbedtls_net_recv(ctx, buf, len);
if (ret != MBEDTLS_ERR_SSL_WANT_READ) {
first_try = 1; /* Next call will be a new operation */
}
return ret;
}
int delayed_send(void *ctx, const unsigned char *buf, size_t len)
{
static int first_try = 1;
int ret;
if (first_try) {
first_try = 0;
return MBEDTLS_ERR_SSL_WANT_WRITE;
}
ret = mbedtls_net_send(ctx, buf, len);
if (ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
first_try = 1; /* Next call will be a new operation */
}
return ret;
}
#if !defined(MBEDTLS_TIMING_C)
int idle(mbedtls_net_context *fd,
int idle_reason)
#else
int idle(mbedtls_net_context *fd,
mbedtls_timing_delay_context *timer,
int idle_reason)
#endif
{
int ret;
int poll_type = 0;
if (idle_reason == MBEDTLS_ERR_SSL_WANT_WRITE) {
poll_type = MBEDTLS_NET_POLL_WRITE;
} else if (idle_reason == MBEDTLS_ERR_SSL_WANT_READ) {
poll_type = MBEDTLS_NET_POLL_READ;
}
#if !defined(MBEDTLS_TIMING_C)
else {
return 0;
}
#endif
while (1) {
/* Check if timer has expired */
#if defined(MBEDTLS_TIMING_C)
if (timer != NULL &&
mbedtls_timing_get_delay(timer) == 2) {
break;
}
#endif /* MBEDTLS_TIMING_C */
/* Check if underlying transport became available */
if (poll_type != 0) {
ret = mbedtls_net_poll(fd, poll_type, 0);
if (ret < 0) {
return ret;
}
if (ret == poll_type) {
break;
}
}
}
return 0;
}
#if defined(MBEDTLS_TEST_HOOKS)
void test_hooks_init(void)
{
mbedtls_test_info_reset();
#if defined(MBEDTLS_TEST_MUTEX_USAGE)
mbedtls_test_mutex_usage_init();
#endif
}
int test_hooks_failure_detected(void)
{
#if defined(MBEDTLS_TEST_MUTEX_USAGE)
/* Errors are reported via mbedtls_test_info. */
mbedtls_test_mutex_usage_check();
#endif
if (mbedtls_test_info.result != MBEDTLS_TEST_RESULT_SUCCESS) {
return 1;
}
return 0;
}
void test_hooks_free(void)
{
}
#endif /* MBEDTLS_TEST_HOOKS */
static const struct {
uint16_t tls_id;
const char *name;
uint8_t is_supported;
} tls_id_group_name_table[] =
{
#if defined(MBEDTLS_ECP_DP_SECP521R1_ENABLED) || defined(PSA_WANT_ECC_SECP_R1_521)
{ MBEDTLS_SSL_IANA_TLS_GROUP_SECP521R1, "secp521r1", 1 },
#else
{ MBEDTLS_SSL_IANA_TLS_GROUP_SECP521R1, "secp521r1", 0 },
#endif
#if defined(MBEDTLS_ECP_DP_BP512R1_ENABLED) || defined(PSA_WANT_ECC_BRAINPOOL_P_R1_512)
{ MBEDTLS_SSL_IANA_TLS_GROUP_BP512R1, "brainpoolP512r1", 1 },
#else
{ MBEDTLS_SSL_IANA_TLS_GROUP_BP512R1, "brainpoolP512r1", 0 },
#endif
#if defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED) || defined(PSA_WANT_ECC_SECP_R1_384)
{ MBEDTLS_SSL_IANA_TLS_GROUP_SECP384R1, "secp384r1", 1 },
#else
{ MBEDTLS_SSL_IANA_TLS_GROUP_SECP384R1, "secp384r1", 0 },
#endif
#if defined(MBEDTLS_ECP_DP_BP384R1_ENABLED) || defined(PSA_WANT_ECC_BRAINPOOL_P_R1_384)
{ MBEDTLS_SSL_IANA_TLS_GROUP_BP384R1, "brainpoolP384r1", 1 },
#else
{ MBEDTLS_SSL_IANA_TLS_GROUP_BP384R1, "brainpoolP384r1", 0 },
#endif
#if defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) || defined(PSA_WANT_ECC_SECP_R1_256)
{ MBEDTLS_SSL_IANA_TLS_GROUP_SECP256R1, "secp256r1", 1 },
#else
{ MBEDTLS_SSL_IANA_TLS_GROUP_SECP256R1, "secp256r1", 0 },
#endif
#if defined(MBEDTLS_ECP_DP_SECP256K1_ENABLED) || defined(PSA_WANT_ECC_SECP_K1_256)
{ MBEDTLS_SSL_IANA_TLS_GROUP_SECP256K1, "secp256k1", 1 },
#else
{ MBEDTLS_SSL_IANA_TLS_GROUP_SECP256K1, "secp256k1", 0 },
#endif
#if defined(MBEDTLS_ECP_DP_BP256R1_ENABLED) || defined(PSA_WANT_ECC_BRAINPOOL_P_R1_256)
{ MBEDTLS_SSL_IANA_TLS_GROUP_BP256R1, "brainpoolP256r1", 1 },
#else
{ MBEDTLS_SSL_IANA_TLS_GROUP_BP256R1, "brainpoolP256r1", 0 },
#endif
#if defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED) || defined(PSA_WANT_ECC_SECP_R1_224)
{ MBEDTLS_SSL_IANA_TLS_GROUP_SECP224R1, "secp224r1", 1 },
#else
{ MBEDTLS_SSL_IANA_TLS_GROUP_SECP224R1, "secp224r1", 0 },
#endif
#if defined(MBEDTLS_ECP_DP_SECP224K1_ENABLED) || defined(PSA_WANT_ECC_SECP_K1_224)
{ MBEDTLS_SSL_IANA_TLS_GROUP_SECP224K1, "secp224k1", 1 },
#else
{ MBEDTLS_SSL_IANA_TLS_GROUP_SECP224K1, "secp224k1", 0 },
#endif
#if defined(MBEDTLS_ECP_DP_SECP192R1_ENABLED) || defined(PSA_WANT_ECC_SECP_R1_192)
{ MBEDTLS_SSL_IANA_TLS_GROUP_SECP192R1, "secp192r1", 1 },
#else
{ MBEDTLS_SSL_IANA_TLS_GROUP_SECP192R1, "secp192r1", 0 },
#endif
#if defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED) || defined(PSA_WANT_ECC_SECP_K1_192)
{ MBEDTLS_SSL_IANA_TLS_GROUP_SECP192K1, "secp192k1", 1 },
#else
{ MBEDTLS_SSL_IANA_TLS_GROUP_SECP192K1, "secp192k1", 0 },
#endif
#if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED) || defined(PSA_WANT_ECC_MONTGOMERY_255)
{ MBEDTLS_SSL_IANA_TLS_GROUP_X25519, "x25519", 1 },
#else
{ MBEDTLS_SSL_IANA_TLS_GROUP_X25519, "x25519", 0 },
#endif
#if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED) || defined(PSA_WANT_ECC_MONTGOMERY_448)
{ MBEDTLS_SSL_IANA_TLS_GROUP_X448, "x448", 1 },
#else
{ MBEDTLS_SSL_IANA_TLS_GROUP_X448, "x448", 0 },
#endif
#if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_EPHEMERAL_ENABLED) && \
defined(PSA_WANT_ALG_FFDH)
{ MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE2048, "ffdhe2048", 1 },
{ MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE3072, "ffdhe3072", 1 },
{ MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE4096, "ffdhe4096", 1 },
{ MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE6144, "ffdhe6144", 1 },
{ MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE8192, "ffdhe8192", 1 },
#else
{ MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE2048, "ffdhe2048", 0 },
{ MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE3072, "ffdhe3072", 0 },
{ MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE4096, "ffdhe4096", 0 },
{ MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE6144, "ffdhe6144", 0 },
{ MBEDTLS_SSL_IANA_TLS_GROUP_FFDHE8192, "ffdhe8192", 0 },
#endif /* MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_EPHEMERAL_ENABLED && PSA_WANT_ALG_FFDH */
{ 0, NULL, 0 },
};
static uint16_t mbedtls_ssl_get_curve_tls_id_from_name(const char *name)
{
if (name == NULL) {
return 0;
}
for (int i = 0; tls_id_group_name_table[i].tls_id != 0; i++) {
if (strcmp(tls_id_group_name_table[i].name, name) == 0) {
return tls_id_group_name_table[i].tls_id;
}
}
return 0;
}
static void mbedtls_ssl_print_supported_groups_list(void)
{
for (int i = 0; tls_id_group_name_table[i].tls_id != 0; i++) {
if (tls_id_group_name_table[i].is_supported == 1) {
mbedtls_printf("%s ", tls_id_group_name_table[i].name);
}
}
}
int parse_groups(const char *groups, uint16_t *group_list, size_t group_list_len)
{
char *p = (char *) groups;
char *q = NULL;
size_t i = 0;
if (strcmp(p, "none") == 0) {
group_list[0] = 0;
} else if (strcmp(p, "default") != 0) {
/* Leave room for a final NULL in group list */
while (i < group_list_len - 1 && *p != '\0') {
uint16_t curve_tls_id;
q = p;
/* Terminate the current string */
while (*p != ',' && *p != '\0') {
p++;
}
if (*p == ',') {
*p++ = '\0';
}
if ((curve_tls_id = mbedtls_ssl_get_curve_tls_id_from_name(q)) != 0) {
group_list[i++] = curve_tls_id;
} else {
mbedtls_printf("unknown group %s\n", q);
mbedtls_printf("supported groups: ");
mbedtls_ssl_print_supported_groups_list();
mbedtls_printf("\n");
return -1;
}
}
mbedtls_printf("Number of groups: %u\n", (unsigned int) i);
if (i == group_list_len - 1 && *p != '\0') {
mbedtls_printf("groups list too long, maximum %u",
(unsigned int) (group_list_len - 1));
return -1;
}
group_list[i] = 0;
}
return 0;
}
#endif /* !defined(MBEDTLS_SSL_TEST_IMPOSSIBLE) */
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