library/ssl_cookie.c - mirror/mbed-tls - TrustedFirmware Git Browser

 /*
  *  DTLS cookie callbacks implementation
  *
  *  Copyright The Mbed TLS Contributors
  *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
  */
 /*
  * These session callbacks use a simple chained list
  * to store and retrieve the session information.
  */

 #include "common.h"

 #if defined(MBEDTLS_SSL_COOKIE_C)

 #include "mbedtls/platform.h"

 #include "mbedtls/ssl_cookie.h"
 #include "ssl_misc.h"
 #include "mbedtls/error.h"
 #include "mbedtls/platform_util.h"
 #include "mbedtls/constant_time.h"

 #include <string.h>

 #if defined(MBEDTLS_USE_PSA_CRYPTO)
 #include "mbedtls/psa_util.h"
 /* Define a local translating function to save code size by not using too many
  * arguments in each translating place. */
 static int local_err_translation(psa_status_t status)
 {
     return psa_status_to_mbedtls(status, psa_to_ssl_errors,
                                  ARRAY_LENGTH(psa_to_ssl_errors),
                                  psa_generic_status_to_mbedtls);
 }
 #define PSA_TO_MBEDTLS_ERR(status) local_err_translation(status)
 #endif

 /*
  * If DTLS is in use, then at least one of SHA-256 or SHA-384 is
  * available. Try SHA-256 first as 384 wastes resources
  */
 #if defined(PSA_WANT_ALG_SHA_256)
 #define COOKIE_MD           MBEDTLS_MD_SHA256
 #define COOKIE_MD_OUTLEN    32
 #define COOKIE_HMAC_LEN     28
 #elif defined(PSA_WANT_ALG_SHA_384)
 #define COOKIE_MD           MBEDTLS_MD_SHA384
 #define COOKIE_MD_OUTLEN    48
 #define COOKIE_HMAC_LEN     28
 #else
 #error "DTLS hello verify needs SHA-256 or SHA-384"
 #endif

 /*
  * Cookies are formed of a 4-bytes timestamp (or serial number) and
  * an HMAC of timestamp and client ID.
  */
 #define COOKIE_LEN      (4 + COOKIE_HMAC_LEN)

 void mbedtls_ssl_cookie_init(mbedtls_ssl_cookie_ctx *ctx)
 {
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
     ctx->psa_hmac_key = MBEDTLS_SVC_KEY_ID_INIT;
 #else
     mbedtls_md_init(&ctx->hmac_ctx);
 #endif /* MBEDTLS_USE_PSA_CRYPTO */
 #if !defined(MBEDTLS_HAVE_TIME)
     ctx->serial = 0;
 #endif
     ctx->timeout = MBEDTLS_SSL_COOKIE_TIMEOUT;

 #if !defined(MBEDTLS_USE_PSA_CRYPTO)
 #if defined(MBEDTLS_THREADING_C)
     mbedtls_mutex_init(&ctx->mutex);
 #endif
 #endif /* !MBEDTLS_USE_PSA_CRYPTO */
 }

 void mbedtls_ssl_cookie_set_timeout(mbedtls_ssl_cookie_ctx *ctx, unsigned long delay)
 {
     ctx->timeout = delay;
 }

 void mbedtls_ssl_cookie_free(mbedtls_ssl_cookie_ctx *ctx)
 {
     if (ctx == NULL) {
         return;
     }

 #if defined(MBEDTLS_USE_PSA_CRYPTO)
     psa_destroy_key(ctx->psa_hmac_key);
 #else
     mbedtls_md_free(&ctx->hmac_ctx);

 #if defined(MBEDTLS_THREADING_C)
     mbedtls_mutex_free(&ctx->mutex);
 #endif
 #endif /* MBEDTLS_USE_PSA_CRYPTO */

     mbedtls_platform_zeroize(ctx, sizeof(mbedtls_ssl_cookie_ctx));
 }

 int mbedtls_ssl_cookie_setup(mbedtls_ssl_cookie_ctx *ctx,
                              int (*f_rng)(void *, unsigned char *, size_t),
                              void *p_rng)
 {
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
     psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
     psa_algorithm_t alg;

     (void) f_rng;
     (void) p_rng;

     alg = mbedtls_md_psa_alg_from_type(COOKIE_MD);
     if (alg == 0) {
         return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
     }

     ctx->psa_hmac_alg = PSA_ALG_TRUNCATED_MAC(PSA_ALG_HMAC(alg),
                                               COOKIE_HMAC_LEN);

     psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_VERIFY_MESSAGE |
                             PSA_KEY_USAGE_SIGN_MESSAGE);
     psa_set_key_algorithm(&attributes, ctx->psa_hmac_alg);
     psa_set_key_type(&attributes, PSA_KEY_TYPE_HMAC);
     psa_set_key_bits(&attributes, PSA_BYTES_TO_BITS(COOKIE_MD_OUTLEN));

     if ((status = psa_generate_key(&attributes,
                                    &ctx->psa_hmac_key)) != PSA_SUCCESS) {
         return PSA_TO_MBEDTLS_ERR(status);
     }
 #else
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     unsigned char key[COOKIE_MD_OUTLEN];

     if ((ret = f_rng(p_rng, key, sizeof(key))) != 0) {
         return ret;
     }

     ret = mbedtls_md_setup(&ctx->hmac_ctx, mbedtls_md_info_from_type(COOKIE_MD), 1);
     if (ret != 0) {
         return ret;
     }

     ret = mbedtls_md_hmac_starts(&ctx->hmac_ctx, key, sizeof(key));
     if (ret != 0) {
         return ret;
     }

     mbedtls_platform_zeroize(key, sizeof(key));
 #endif /* MBEDTLS_USE_PSA_CRYPTO */

     return 0;
 }

 #if !defined(MBEDTLS_USE_PSA_CRYPTO)
 /*
  * Generate the HMAC part of a cookie
  */
 MBEDTLS_CHECK_RETURN_CRITICAL
 static int ssl_cookie_hmac(mbedtls_md_context_t *hmac_ctx,
                            const unsigned char time[4],
                            unsigned char **p, unsigned char *end,
                            const unsigned char *cli_id, size_t cli_id_len)
 {
     unsigned char hmac_out[COOKIE_MD_OUTLEN];

     MBEDTLS_SSL_CHK_BUF_PTR(*p, end, COOKIE_HMAC_LEN);

     if (mbedtls_md_hmac_reset(hmac_ctx) != 0 ||
         mbedtls_md_hmac_update(hmac_ctx, time, 4) != 0 ||
         mbedtls_md_hmac_update(hmac_ctx, cli_id, cli_id_len) != 0 ||
         mbedtls_md_hmac_finish(hmac_ctx, hmac_out) != 0) {
         return MBEDTLS_ERR_SSL_INTERNAL_ERROR;
     }

     memcpy(*p, hmac_out, COOKIE_HMAC_LEN);
     *p += COOKIE_HMAC_LEN;

     return 0;
 }
 #endif /* !MBEDTLS_USE_PSA_CRYPTO */

 /*
  * Generate cookie for DTLS ClientHello verification
  */
 int mbedtls_ssl_cookie_write(void *p_ctx,
                              unsigned char **p, unsigned char *end,
                              const unsigned char *cli_id, size_t cli_id_len)
 {
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
     psa_mac_operation_t operation = PSA_MAC_OPERATION_INIT;
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
     size_t sign_mac_length = 0;
 #endif
     int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
     mbedtls_ssl_cookie_ctx *ctx = (mbedtls_ssl_cookie_ctx *) p_ctx;
     unsigned long t;

     if (ctx == NULL || cli_id == NULL) {
         return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
     }

     MBEDTLS_SSL_CHK_BUF_PTR(*p, end, COOKIE_LEN);

 #if defined(MBEDTLS_HAVE_TIME)
     t = (unsigned long) mbedtls_time(NULL);
 #else
     t = ctx->serial++;
 #endif

     MBEDTLS_PUT_UINT32_BE(t, *p, 0);
     *p += 4;

 #if defined(MBEDTLS_USE_PSA_CRYPTO)
     status = psa_mac_sign_setup(&operation, ctx->psa_hmac_key,
                                 ctx->psa_hmac_alg);
     if (status != PSA_SUCCESS) {
         ret = PSA_TO_MBEDTLS_ERR(status);
         goto exit;
     }

     status = psa_mac_update(&operation, *p - 4, 4);
     if (status != PSA_SUCCESS) {
         ret = PSA_TO_MBEDTLS_ERR(status);
         goto exit;
     }

     status = psa_mac_update(&operation, cli_id, cli_id_len);
     if (status != PSA_SUCCESS) {
         ret = PSA_TO_MBEDTLS_ERR(status);
         goto exit;
     }

     status = psa_mac_sign_finish(&operation, *p, COOKIE_MD_OUTLEN,
                                  &sign_mac_length);
     if (status != PSA_SUCCESS) {
         ret = PSA_TO_MBEDTLS_ERR(status);
         goto exit;
     }

     *p += COOKIE_HMAC_LEN;

     ret = 0;
 #else
 #if defined(MBEDTLS_THREADING_C)
     if ((ret = mbedtls_mutex_lock(&ctx->mutex)) != 0) {
         return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_SSL_INTERNAL_ERROR, ret);
     }
 #endif

     ret = ssl_cookie_hmac(&ctx->hmac_ctx, *p - 4,
                           p, end, cli_id, cli_id_len);

 #if defined(MBEDTLS_THREADING_C)
     if (mbedtls_mutex_unlock(&ctx->mutex) != 0) {
         return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_SSL_INTERNAL_ERROR,
                                  MBEDTLS_ERR_THREADING_MUTEX_ERROR);
     }
 #endif
 #endif /* MBEDTLS_USE_PSA_CRYPTO */

 #if defined(MBEDTLS_USE_PSA_CRYPTO)
 exit:
     status = psa_mac_abort(&operation);
     if (status != PSA_SUCCESS) {
         ret = PSA_TO_MBEDTLS_ERR(status);
     }
 #endif /* MBEDTLS_USE_PSA_CRYPTO */
     return ret;
 }

 /*
  * Check a cookie
  */
 int mbedtls_ssl_cookie_check(void *p_ctx,
                              const unsigned char *cookie, size_t cookie_len,
                              const unsigned char *cli_id, size_t cli_id_len)
 {
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
     psa_mac_operation_t operation = PSA_MAC_OPERATION_INIT;
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
 #else
     unsigned char ref_hmac[COOKIE_HMAC_LEN];
     unsigned char *p = ref_hmac;
 #endif
     int ret = 0;
     mbedtls_ssl_cookie_ctx *ctx = (mbedtls_ssl_cookie_ctx *) p_ctx;
     unsigned long cur_time, cookie_time;

     if (ctx == NULL || cli_id == NULL) {
         return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
     }

     if (cookie_len != COOKIE_LEN) {
         return -1;
     }

 #if defined(MBEDTLS_USE_PSA_CRYPTO)
     status = psa_mac_verify_setup(&operation, ctx->psa_hmac_key,
                                   ctx->psa_hmac_alg);
     if (status != PSA_SUCCESS) {
         ret = PSA_TO_MBEDTLS_ERR(status);
         goto exit;
     }

     status = psa_mac_update(&operation, cookie, 4);
     if (status != PSA_SUCCESS) {
         ret = PSA_TO_MBEDTLS_ERR(status);
         goto exit;
     }

     status = psa_mac_update(&operation, cli_id,
                             cli_id_len);
     if (status != PSA_SUCCESS) {
         ret = PSA_TO_MBEDTLS_ERR(status);
         goto exit;
     }

     status = psa_mac_verify_finish(&operation, cookie + 4,
                                    COOKIE_HMAC_LEN);
     if (status != PSA_SUCCESS) {
         ret = PSA_TO_MBEDTLS_ERR(status);
         goto exit;
     }

     ret = 0;
 #else
 #if defined(MBEDTLS_THREADING_C)
     if ((ret = mbedtls_mutex_lock(&ctx->mutex)) != 0) {
         return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_SSL_INTERNAL_ERROR, ret);
     }
 #endif

     if (ssl_cookie_hmac(&ctx->hmac_ctx, cookie,
                         &p, p + sizeof(ref_hmac),
                         cli_id, cli_id_len) != 0) {
         ret = -1;
     }

 #if defined(MBEDTLS_THREADING_C)
     if (mbedtls_mutex_unlock(&ctx->mutex) != 0) {
         ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_SSL_INTERNAL_ERROR,
                                 MBEDTLS_ERR_THREADING_MUTEX_ERROR);
     }
 #endif

     if (ret != 0) {
         goto exit;
     }

     if (mbedtls_ct_memcmp(cookie + 4, ref_hmac, sizeof(ref_hmac)) != 0) {
         ret = -1;
         goto exit;
     }
 #endif /* MBEDTLS_USE_PSA_CRYPTO */

 #if defined(MBEDTLS_HAVE_TIME)
     cur_time = (unsigned long) mbedtls_time(NULL);
 #else
     cur_time = ctx->serial;
 #endif

     cookie_time = (unsigned long) MBEDTLS_GET_UINT32_BE(cookie, 0);

     if (ctx->timeout != 0 && cur_time - cookie_time > ctx->timeout) {
         ret = -1;
         goto exit;
     }

 exit:
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
     status = psa_mac_abort(&operation);
     if (status != PSA_SUCCESS) {
         ret = PSA_TO_MBEDTLS_ERR(status);
     }
 #else
     mbedtls_platform_zeroize(ref_hmac, sizeof(ref_hmac));
 #endif /* MBEDTLS_USE_PSA_CRYPTO */
     return ret;
 }
 #endif /* MBEDTLS_SSL_COOKIE_C */
	/*
	* DTLS cookie callbacks implementation
	*
	* Copyright The Mbed TLS Contributors
	* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
	*/
	/*
	* These session callbacks use a simple chained list
	* to store and retrieve the session information.
	*/

	#include "common.h"

	#if defined(MBEDTLS_SSL_COOKIE_C)

	#include "mbedtls/platform.h"

	#include "mbedtls/ssl_cookie.h"
	#include "ssl_misc.h"
	#include "mbedtls/error.h"
	#include "mbedtls/platform_util.h"
	#include "mbedtls/constant_time.h"

	#include <string.h>

	#if defined(MBEDTLS_USE_PSA_CRYPTO)
	#include "mbedtls/psa_util.h"
	/* Define a local translating function to save code size by not using too many
	* arguments in each translating place. */
	static int local_err_translation(psa_status_t status)
	{
	return psa_status_to_mbedtls(status, psa_to_ssl_errors,
	ARRAY_LENGTH(psa_to_ssl_errors),
	psa_generic_status_to_mbedtls);
	}
	#define PSA_TO_MBEDTLS_ERR(status) local_err_translation(status)
	#endif

	/*
	* If DTLS is in use, then at least one of SHA-256 or SHA-384 is
	* available. Try SHA-256 first as 384 wastes resources
	*/
	#if defined(PSA_WANT_ALG_SHA_256)
	#define COOKIE_MD MBEDTLS_MD_SHA256
	#define COOKIE_MD_OUTLEN 32
	#define COOKIE_HMAC_LEN 28
	#elif defined(PSA_WANT_ALG_SHA_384)
	#define COOKIE_MD MBEDTLS_MD_SHA384
	#define COOKIE_MD_OUTLEN 48
	#define COOKIE_HMAC_LEN 28
	#else
	#error "DTLS hello verify needs SHA-256 or SHA-384"
	#endif

	/*
	* Cookies are formed of a 4-bytes timestamp (or serial number) and
	* an HMAC of timestamp and client ID.
	*/
	#define COOKIE_LEN (4 + COOKIE_HMAC_LEN)

	void mbedtls_ssl_cookie_init(mbedtls_ssl_cookie_ctx *ctx)
	{
	#if defined(MBEDTLS_USE_PSA_CRYPTO)
	ctx->psa_hmac_key = MBEDTLS_SVC_KEY_ID_INIT;
	#else
	mbedtls_md_init(&ctx->hmac_ctx);
	#endif /* MBEDTLS_USE_PSA_CRYPTO */
	#if !defined(MBEDTLS_HAVE_TIME)
	ctx->serial = 0;
	#endif
	ctx->timeout = MBEDTLS_SSL_COOKIE_TIMEOUT;

	#if !defined(MBEDTLS_USE_PSA_CRYPTO)
	#if defined(MBEDTLS_THREADING_C)
	mbedtls_mutex_init(&ctx->mutex);
	#endif
	#endif /* !MBEDTLS_USE_PSA_CRYPTO */
	}

	void mbedtls_ssl_cookie_set_timeout(mbedtls_ssl_cookie_ctx *ctx, unsigned long delay)
	{
	ctx->timeout = delay;
	}

	void mbedtls_ssl_cookie_free(mbedtls_ssl_cookie_ctx *ctx)
	{
	if (ctx == NULL) {
	return;
	}

	#if defined(MBEDTLS_USE_PSA_CRYPTO)
	psa_destroy_key(ctx->psa_hmac_key);
	#else
	mbedtls_md_free(&ctx->hmac_ctx);

	#if defined(MBEDTLS_THREADING_C)
	mbedtls_mutex_free(&ctx->mutex);
	#endif
	#endif /* MBEDTLS_USE_PSA_CRYPTO */

	mbedtls_platform_zeroize(ctx, sizeof(mbedtls_ssl_cookie_ctx));
	}

	int mbedtls_ssl_cookie_setup(mbedtls_ssl_cookie_ctx *ctx,
	int (f_rng)(void , unsigned char *, size_t),
	void *p_rng)
	{
	#if defined(MBEDTLS_USE_PSA_CRYPTO)
	psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
	psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
	psa_algorithm_t alg;

	(void) f_rng;
	(void) p_rng;

	alg = mbedtls_md_psa_alg_from_type(COOKIE_MD);
	if (alg == 0) {
	return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
	}

	ctx->psa_hmac_alg = PSA_ALG_TRUNCATED_MAC(PSA_ALG_HMAC(alg),
	COOKIE_HMAC_LEN);

	psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_VERIFY_MESSAGE \|
	PSA_KEY_USAGE_SIGN_MESSAGE);
	psa_set_key_algorithm(&attributes, ctx->psa_hmac_alg);
	psa_set_key_type(&attributes, PSA_KEY_TYPE_HMAC);
	psa_set_key_bits(&attributes, PSA_BYTES_TO_BITS(COOKIE_MD_OUTLEN));

	if ((status = psa_generate_key(&attributes,
	&ctx->psa_hmac_key)) != PSA_SUCCESS) {
	return PSA_TO_MBEDTLS_ERR(status);
	}
	#else
	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
	unsigned char key[COOKIE_MD_OUTLEN];

	if ((ret = f_rng(p_rng, key, sizeof(key))) != 0) {
	return ret;
	}

	ret = mbedtls_md_setup(&ctx->hmac_ctx, mbedtls_md_info_from_type(COOKIE_MD), 1);
	if (ret != 0) {
	return ret;
	}

	ret = mbedtls_md_hmac_starts(&ctx->hmac_ctx, key, sizeof(key));
	if (ret != 0) {
	return ret;
	}

	mbedtls_platform_zeroize(key, sizeof(key));
	#endif /* MBEDTLS_USE_PSA_CRYPTO */

	return 0;
	}

	#if !defined(MBEDTLS_USE_PSA_CRYPTO)
	/*
	* Generate the HMAC part of a cookie
	*/
	MBEDTLS_CHECK_RETURN_CRITICAL
	static int ssl_cookie_hmac(mbedtls_md_context_t *hmac_ctx,
	const unsigned char time[4],
	unsigned char *p, unsigned char end,
	const unsigned char *cli_id, size_t cli_id_len)
	{
	unsigned char hmac_out[COOKIE_MD_OUTLEN];

	MBEDTLS_SSL_CHK_BUF_PTR(*p, end, COOKIE_HMAC_LEN);

	if (mbedtls_md_hmac_reset(hmac_ctx) != 0 \|\|
	mbedtls_md_hmac_update(hmac_ctx, time, 4) != 0 \|\|
	mbedtls_md_hmac_update(hmac_ctx, cli_id, cli_id_len) != 0 \|\|
	mbedtls_md_hmac_finish(hmac_ctx, hmac_out) != 0) {
	return MBEDTLS_ERR_SSL_INTERNAL_ERROR;
	}

	memcpy(*p, hmac_out, COOKIE_HMAC_LEN);
	*p += COOKIE_HMAC_LEN;

	return 0;
	}
	#endif /* !MBEDTLS_USE_PSA_CRYPTO */

	/*
	* Generate cookie for DTLS ClientHello verification
	*/
	int mbedtls_ssl_cookie_write(void *p_ctx,
	unsigned char *p, unsigned char end,
	const unsigned char *cli_id, size_t cli_id_len)
	{
	#if defined(MBEDTLS_USE_PSA_CRYPTO)
	psa_mac_operation_t operation = PSA_MAC_OPERATION_INIT;
	psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
	size_t sign_mac_length = 0;
	#endif
	int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
	mbedtls_ssl_cookie_ctx ctx = (mbedtls_ssl_cookie_ctx ) p_ctx;
	unsigned long t;

	if (ctx == NULL \|\| cli_id == NULL) {
	return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
	}

	MBEDTLS_SSL_CHK_BUF_PTR(*p, end, COOKIE_LEN);

	#if defined(MBEDTLS_HAVE_TIME)
	t = (unsigned long) mbedtls_time(NULL);
	#else
	t = ctx->serial++;
	#endif

	MBEDTLS_PUT_UINT32_BE(t, *p, 0);
	*p += 4;

	#if defined(MBEDTLS_USE_PSA_CRYPTO)
	status = psa_mac_sign_setup(&operation, ctx->psa_hmac_key,
	ctx->psa_hmac_alg);
	if (status != PSA_SUCCESS) {
	ret = PSA_TO_MBEDTLS_ERR(status);
	goto exit;
	}

	status = psa_mac_update(&operation, *p - 4, 4);
	if (status != PSA_SUCCESS) {
	ret = PSA_TO_MBEDTLS_ERR(status);
	goto exit;
	}

	status = psa_mac_update(&operation, cli_id, cli_id_len);
	if (status != PSA_SUCCESS) {
	ret = PSA_TO_MBEDTLS_ERR(status);
	goto exit;
	}

	status = psa_mac_sign_finish(&operation, *p, COOKIE_MD_OUTLEN,
	&sign_mac_length);
	if (status != PSA_SUCCESS) {
	ret = PSA_TO_MBEDTLS_ERR(status);
	goto exit;
	}

	*p += COOKIE_HMAC_LEN;

	ret = 0;
	#else
	#if defined(MBEDTLS_THREADING_C)
	if ((ret = mbedtls_mutex_lock(&ctx->mutex)) != 0) {
	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_SSL_INTERNAL_ERROR, ret);
	}
	#endif

	ret = ssl_cookie_hmac(&ctx->hmac_ctx, *p - 4,
	p, end, cli_id, cli_id_len);

	#if defined(MBEDTLS_THREADING_C)
	if (mbedtls_mutex_unlock(&ctx->mutex) != 0) {
	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_SSL_INTERNAL_ERROR,
	MBEDTLS_ERR_THREADING_MUTEX_ERROR);
	}
	#endif
	#endif /* MBEDTLS_USE_PSA_CRYPTO */

	#if defined(MBEDTLS_USE_PSA_CRYPTO)
	exit:
	status = psa_mac_abort(&operation);
	if (status != PSA_SUCCESS) {
	ret = PSA_TO_MBEDTLS_ERR(status);
	}
	#endif /* MBEDTLS_USE_PSA_CRYPTO */
	return ret;
	}

	/*
	* Check a cookie
	*/
	int mbedtls_ssl_cookie_check(void *p_ctx,
	const unsigned char *cookie, size_t cookie_len,
	const unsigned char *cli_id, size_t cli_id_len)
	{
	#if defined(MBEDTLS_USE_PSA_CRYPTO)
	psa_mac_operation_t operation = PSA_MAC_OPERATION_INIT;
	psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
	#else
	unsigned char ref_hmac[COOKIE_HMAC_LEN];
	unsigned char *p = ref_hmac;
	#endif
	int ret = 0;
	mbedtls_ssl_cookie_ctx ctx = (mbedtls_ssl_cookie_ctx ) p_ctx;
	unsigned long cur_time, cookie_time;

	if (ctx == NULL \|\| cli_id == NULL) {
	return MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
	}

	if (cookie_len != COOKIE_LEN) {
	return -1;
	}

	#if defined(MBEDTLS_USE_PSA_CRYPTO)
	status = psa_mac_verify_setup(&operation, ctx->psa_hmac_key,
	ctx->psa_hmac_alg);
	if (status != PSA_SUCCESS) {
	ret = PSA_TO_MBEDTLS_ERR(status);
	goto exit;
	}

	status = psa_mac_update(&operation, cookie, 4);
	if (status != PSA_SUCCESS) {
	ret = PSA_TO_MBEDTLS_ERR(status);
	goto exit;
	}

	status = psa_mac_update(&operation, cli_id,
	cli_id_len);
	if (status != PSA_SUCCESS) {
	ret = PSA_TO_MBEDTLS_ERR(status);
	goto exit;
	}

	status = psa_mac_verify_finish(&operation, cookie + 4,
	COOKIE_HMAC_LEN);
	if (status != PSA_SUCCESS) {
	ret = PSA_TO_MBEDTLS_ERR(status);
	goto exit;
	}

	ret = 0;
	#else
	#if defined(MBEDTLS_THREADING_C)
	if ((ret = mbedtls_mutex_lock(&ctx->mutex)) != 0) {
	return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_SSL_INTERNAL_ERROR, ret);
	}
	#endif

	if (ssl_cookie_hmac(&ctx->hmac_ctx, cookie,
	&p, p + sizeof(ref_hmac),
	cli_id, cli_id_len) != 0) {
	ret = -1;
	}

	#if defined(MBEDTLS_THREADING_C)
	if (mbedtls_mutex_unlock(&ctx->mutex) != 0) {
	ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_SSL_INTERNAL_ERROR,
	MBEDTLS_ERR_THREADING_MUTEX_ERROR);
	}
	#endif

	if (ret != 0) {
	goto exit;
	}

	if (mbedtls_ct_memcmp(cookie + 4, ref_hmac, sizeof(ref_hmac)) != 0) {
	ret = -1;
	goto exit;
	}
	#endif /* MBEDTLS_USE_PSA_CRYPTO */

	#if defined(MBEDTLS_HAVE_TIME)
	cur_time = (unsigned long) mbedtls_time(NULL);
	#else
	cur_time = ctx->serial;
	#endif

	cookie_time = (unsigned long) MBEDTLS_GET_UINT32_BE(cookie, 0);

	if (ctx->timeout != 0 && cur_time - cookie_time > ctx->timeout) {
	ret = -1;
	goto exit;
	}

	exit:
	#if defined(MBEDTLS_USE_PSA_CRYPTO)
	status = psa_mac_abort(&operation);
	if (status != PSA_SUCCESS) {
	ret = PSA_TO_MBEDTLS_ERR(status);
	}
	#else
	mbedtls_platform_zeroize(ref_hmac, sizeof(ref_hmac));
	#endif /* MBEDTLS_USE_PSA_CRYPTO */
	return ret;
	}
	#endif /* MBEDTLS_SSL_COOKIE_C */