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gbe_fork/mbedtls/ssl_tls13_keys.h
otavepto 92c77cee31 added a new cryptography library Mbed TLS
2023-12-24 14:33:40 +02:00

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/*
* TLS 1.3 key schedule
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#if !defined(MBEDTLS_SSL_TLS1_3_KEYS_H)
#define MBEDTLS_SSL_TLS1_3_KEYS_H
/* This requires MBEDTLS_SSL_TLS1_3_LABEL( idx, name, string ) to be defined at
* the point of use. See e.g. the definition of mbedtls_ssl_tls13_labels_union
* below. */
#define MBEDTLS_SSL_TLS1_3_LABEL_LIST \
MBEDTLS_SSL_TLS1_3_LABEL(finished, "finished") \
MBEDTLS_SSL_TLS1_3_LABEL(resumption, "resumption") \
MBEDTLS_SSL_TLS1_3_LABEL(traffic_upd, "traffic upd") \
MBEDTLS_SSL_TLS1_3_LABEL(exporter, "exporter") \
MBEDTLS_SSL_TLS1_3_LABEL(key, "key") \
MBEDTLS_SSL_TLS1_3_LABEL(iv, "iv") \
MBEDTLS_SSL_TLS1_3_LABEL(c_hs_traffic, "c hs traffic") \
MBEDTLS_SSL_TLS1_3_LABEL(c_ap_traffic, "c ap traffic") \
MBEDTLS_SSL_TLS1_3_LABEL(c_e_traffic, "c e traffic") \
MBEDTLS_SSL_TLS1_3_LABEL(s_hs_traffic, "s hs traffic") \
MBEDTLS_SSL_TLS1_3_LABEL(s_ap_traffic, "s ap traffic") \
MBEDTLS_SSL_TLS1_3_LABEL(s_e_traffic, "s e traffic") \
MBEDTLS_SSL_TLS1_3_LABEL(e_exp_master, "e exp master") \
MBEDTLS_SSL_TLS1_3_LABEL(res_master, "res master") \
MBEDTLS_SSL_TLS1_3_LABEL(exp_master, "exp master") \
MBEDTLS_SSL_TLS1_3_LABEL(ext_binder, "ext binder") \
MBEDTLS_SSL_TLS1_3_LABEL(res_binder, "res binder") \
MBEDTLS_SSL_TLS1_3_LABEL(derived, "derived") \
MBEDTLS_SSL_TLS1_3_LABEL(client_cv, "TLS 1.3, client CertificateVerify") \
MBEDTLS_SSL_TLS1_3_LABEL(server_cv, "TLS 1.3, server CertificateVerify")
#define MBEDTLS_SSL_TLS1_3_CONTEXT_UNHASHED 0
#define MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED 1
#define MBEDTLS_SSL_TLS1_3_PSK_EXTERNAL 0
#define MBEDTLS_SSL_TLS1_3_PSK_RESUMPTION 1
#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
#define MBEDTLS_SSL_TLS1_3_LABEL(name, string) \
const unsigned char name [sizeof(string) - 1];
union mbedtls_ssl_tls13_labels_union {
MBEDTLS_SSL_TLS1_3_LABEL_LIST
};
struct mbedtls_ssl_tls13_labels_struct {
MBEDTLS_SSL_TLS1_3_LABEL_LIST
};
#undef MBEDTLS_SSL_TLS1_3_LABEL
extern const struct mbedtls_ssl_tls13_labels_struct mbedtls_ssl_tls13_labels;
#define MBEDTLS_SSL_TLS1_3_LBL_LEN(LABEL) \
sizeof(mbedtls_ssl_tls13_labels.LABEL)
#define MBEDTLS_SSL_TLS1_3_LBL_WITH_LEN(LABEL) \
mbedtls_ssl_tls13_labels.LABEL, \
MBEDTLS_SSL_TLS1_3_LBL_LEN(LABEL)
#define MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_LABEL_LEN \
sizeof(union mbedtls_ssl_tls13_labels_union)
/* The maximum length of HKDF contexts used in the TLS 1.3 standard.
* Since contexts are always hashes of message transcripts, this can
* be approximated from above by the maximum hash size. */
#define MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_CONTEXT_LEN \
PSA_HASH_MAX_SIZE
/* Maximum desired length for expanded key material generated
* by HKDF-Expand-Label.
*
* Warning: If this ever needs to be increased, the implementation
* ssl_tls13_hkdf_encode_label() in ssl_tls13_keys.c needs to be
* adjusted since it currently assumes that HKDF key expansion
* is never used with more than 255 Bytes of output. */
#define MBEDTLS_SSL_TLS1_3_KEY_SCHEDULE_MAX_EXPANSION_LEN 255
/**
* \brief The \c HKDF-Expand-Label function from
* the TLS 1.3 standard RFC 8446.
*
* <tt>
* HKDF-Expand-Label( Secret, Label, Context, Length ) =
* HKDF-Expand( Secret, HkdfLabel, Length )
* </tt>
*
* \param hash_alg The identifier for the hash algorithm to use.
* \param secret The \c Secret argument to \c HKDF-Expand-Label.
* This must be a readable buffer of length
* \p secret_len Bytes.
* \param secret_len The length of \p secret in Bytes.
* \param label The \c Label argument to \c HKDF-Expand-Label.
* This must be a readable buffer of length
* \p label_len Bytes.
* \param label_len The length of \p label in Bytes.
* \param ctx The \c Context argument to \c HKDF-Expand-Label.
* This must be a readable buffer of length \p ctx_len Bytes.
* \param ctx_len The length of \p context in Bytes.
* \param buf The destination buffer to hold the expanded secret.
* This must be a writable buffer of length \p buf_len Bytes.
* \param buf_len The desired size of the expanded secret in Bytes.
*
* \returns \c 0 on success.
* \return A negative error code on failure.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_hkdf_expand_label(
psa_algorithm_t hash_alg,
const unsigned char *secret, size_t secret_len,
const unsigned char *label, size_t label_len,
const unsigned char *ctx, size_t ctx_len,
unsigned char *buf, size_t buf_len);
/**
* \brief This function is part of the TLS 1.3 key schedule.
* It extracts key and IV for the actual client/server traffic
* from the client/server traffic secrets.
*
* From RFC 8446:
*
* <tt>
* [sender]_write_key = HKDF-Expand-Label(Secret, "key", "", key_length)
* [sender]_write_iv = HKDF-Expand-Label(Secret, "iv", "", iv_length)*
* </tt>
*
* \param hash_alg The identifier for the hash algorithm to be used
* for the HKDF-based expansion of the secret.
* \param client_secret The client traffic secret.
* This must be a readable buffer of size
* \p secret_len Bytes
* \param server_secret The server traffic secret.
* This must be a readable buffer of size
* \p secret_len Bytes
* \param secret_len Length of the secrets \p client_secret and
* \p server_secret in Bytes.
* \param key_len The desired length of the key to be extracted in Bytes.
* \param iv_len The desired length of the IV to be extracted in Bytes.
* \param keys The address of the structure holding the generated
* keys and IVs.
*
* \returns \c 0 on success.
* \returns A negative error code on failure.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_make_traffic_keys(
psa_algorithm_t hash_alg,
const unsigned char *client_secret,
const unsigned char *server_secret, size_t secret_len,
size_t key_len, size_t iv_len,
mbedtls_ssl_key_set *keys);
/**
* \brief The \c Derive-Secret function from the TLS 1.3 standard RFC 8446.
*
* <tt>
* Derive-Secret( Secret, Label, Messages ) =
* HKDF-Expand-Label( Secret, Label,
* Hash( Messages ),
* Hash.Length ) )
* </tt>
*
* \param hash_alg The identifier for the hash function used for the
* applications of HKDF.
* \param secret The \c Secret argument to the \c Derive-Secret function.
* This must be a readable buffer of length
* \p secret_len Bytes.
* \param secret_len The length of \p secret in Bytes.
* \param label The \c Label argument to the \c Derive-Secret function.
* This must be a readable buffer of length
* \p label_len Bytes.
* \param label_len The length of \p label in Bytes.
* \param ctx The hash of the \c Messages argument to the
* \c Derive-Secret function, or the \c Messages argument
* itself, depending on \p ctx_hashed.
* \param ctx_len The length of \p ctx in Bytes.
* \param ctx_hashed This indicates whether the \p ctx contains the hash of
* the \c Messages argument in the application of the
* \c Derive-Secret function
* (value MBEDTLS_SSL_TLS1_3_CONTEXT_HASHED), or whether
* it is the content of \c Messages itself, in which case
* the function takes care of the hashing
* (value MBEDTLS_SSL_TLS1_3_CONTEXT_UNHASHED).
* \param dstbuf The target buffer to write the output of
* \c Derive-Secret to. This must be a writable buffer of
* size \p dtsbuf_len Bytes.
* \param dstbuf_len The length of \p dstbuf in Bytes.
*
* \returns \c 0 on success.
* \returns A negative error code on failure.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_derive_secret(
psa_algorithm_t hash_alg,
const unsigned char *secret, size_t secret_len,
const unsigned char *label, size_t label_len,
const unsigned char *ctx, size_t ctx_len,
int ctx_hashed,
unsigned char *dstbuf, size_t dstbuf_len);
/**
* \brief Derive TLS 1.3 early data key material from early secret.
*
* This is a small wrapper invoking mbedtls_ssl_tls13_derive_secret()
* with the appropriate labels.
*
* <tt>
* Early Secret
* |
* +-----> Derive-Secret(., "c e traffic", ClientHello)
* | = client_early_traffic_secret
* |
* +-----> Derive-Secret(., "e exp master", ClientHello)
* . = early_exporter_master_secret
* .
* .
* </tt>
*
* \note To obtain the actual key and IV for the early data traffic,
* the client secret derived by this function need to be
* further processed by mbedtls_ssl_tls13_make_traffic_keys().
*
* \note The binder key, which is also generated from the early secret,
* is omitted here. Its calculation is part of the separate routine
* mbedtls_ssl_tls13_create_psk_binder().
*
* \param hash_alg The hash algorithm associated with the PSK for which
* early data key material is being derived.
* \param early_secret The early secret from which the early data key material
* should be derived. This must be a readable buffer whose
* length is the digest size of the hash algorithm
* represented by \p md_size.
* \param transcript The transcript of the handshake so far, calculated with
* respect to \p hash_alg. This must be a readable buffer
* whose length is the digest size of the hash algorithm
* represented by \p md_size.
* \param derived The address of the structure in which to store
* the early data key material.
*
* \returns \c 0 on success.
* \returns A negative error code on failure.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_derive_early_secrets(
psa_algorithm_t hash_alg,
unsigned char const *early_secret,
unsigned char const *transcript, size_t transcript_len,
mbedtls_ssl_tls13_early_secrets *derived);
/**
* \brief Derive TLS 1.3 handshake key material from the handshake secret.
*
* This is a small wrapper invoking mbedtls_ssl_tls13_derive_secret()
* with the appropriate labels from the standard.
*
* <tt>
* Handshake Secret
* |
* +-----> Derive-Secret( ., "c hs traffic",
* | ClientHello...ServerHello )
* | = client_handshake_traffic_secret
* |
* +-----> Derive-Secret( ., "s hs traffic",
* . ClientHello...ServerHello )
* . = server_handshake_traffic_secret
* .
* </tt>
*
* \note To obtain the actual key and IV for the encrypted handshake traffic,
* the client and server secret derived by this function need to be
* further processed by mbedtls_ssl_tls13_make_traffic_keys().
*
* \param hash_alg The hash algorithm associated with the ciphersuite
* that's being used for the connection.
* \param handshake_secret The handshake secret from which the handshake key
* material should be derived. This must be a readable
* buffer whose length is the digest size of the hash
* algorithm represented by \p md_size.
* \param transcript The transcript of the handshake so far, calculated
* with respect to \p hash_alg. This must be a readable
* buffer whose length is the digest size of the hash
* algorithm represented by \p md_size.
* \param derived The address of the structure in which to
* store the handshake key material.
*
* \returns \c 0 on success.
* \returns A negative error code on failure.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_derive_handshake_secrets(
psa_algorithm_t hash_alg,
unsigned char const *handshake_secret,
unsigned char const *transcript, size_t transcript_len,
mbedtls_ssl_tls13_handshake_secrets *derived);
/**
* \brief Derive TLS 1.3 application key material from the master secret.
*
* This is a small wrapper invoking mbedtls_ssl_tls13_derive_secret()
* with the appropriate labels from the standard.
*
* <tt>
* Master Secret
* |
* +-----> Derive-Secret( ., "c ap traffic",
* | ClientHello...server Finished )
* | = client_application_traffic_secret_0
* |
* +-----> Derive-Secret( ., "s ap traffic",
* | ClientHello...Server Finished )
* | = server_application_traffic_secret_0
* |
* +-----> Derive-Secret( ., "exp master",
* . ClientHello...server Finished)
* . = exporter_master_secret
* .
* </tt>
*
* \note To obtain the actual key and IV for the (0-th) application traffic,
* the client and server secret derived by this function need to be
* further processed by mbedtls_ssl_tls13_make_traffic_keys().
*
* \param hash_alg The hash algorithm associated with the ciphersuite
* that's being used for the connection.
* \param master_secret The master secret from which the application key
* material should be derived. This must be a readable
* buffer whose length is the digest size of the hash
* algorithm represented by \p md_size.
* \param transcript The transcript of the handshake up to and including
* the ServerFinished message, calculated with respect
* to \p hash_alg. This must be a readable buffer whose
* length is the digest size of the hash algorithm
* represented by \p hash_alg.
* \param derived The address of the structure in which to
* store the application key material.
*
* \returns \c 0 on success.
* \returns A negative error code on failure.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_derive_application_secrets(
psa_algorithm_t hash_alg,
unsigned char const *master_secret,
unsigned char const *transcript, size_t transcript_len,
mbedtls_ssl_tls13_application_secrets *derived);
/**
* \brief Derive TLS 1.3 resumption master secret from the master secret.
*
* This is a small wrapper invoking mbedtls_ssl_tls13_derive_secret()
* with the appropriate labels from the standard.
*
* \param hash_alg The hash algorithm used in the application for which
* key material is being derived.
* \param application_secret The application secret from which the resumption master
* secret should be derived. This must be a readable
* buffer whose length is the digest size of the hash
* algorithm represented by \p md_size.
* \param transcript The transcript of the handshake up to and including
* the ClientFinished message, calculated with respect
* to \p hash_alg. This must be a readable buffer whose
* length is the digest size of the hash algorithm
* represented by \p hash_alg.
* \param transcript_len The length of \p transcript in Bytes.
* \param derived The address of the structure in which to
* store the resumption master secret.
*
* \returns \c 0 on success.
* \returns A negative error code on failure.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_derive_resumption_master_secret(
psa_algorithm_t hash_alg,
unsigned char const *application_secret,
unsigned char const *transcript, size_t transcript_len,
mbedtls_ssl_tls13_application_secrets *derived);
/**
* \brief Compute the next secret in the TLS 1.3 key schedule
*
* The TLS 1.3 key schedule proceeds as follows to compute
* the three main secrets during the handshake: The early
* secret for early data, the handshake secret for all
* other encrypted handshake messages, and the master
* secret for all application traffic.
*
* <tt>
* 0
* |
* v
* PSK -> HKDF-Extract = Early Secret
* |
* v
* Derive-Secret( ., "derived", "" )
* |
* v
* (EC)DHE -> HKDF-Extract = Handshake Secret
* |
* v
* Derive-Secret( ., "derived", "" )
* |
* v
* 0 -> HKDF-Extract = Master Secret
* </tt>
*
* Each of the three secrets in turn is the basis for further
* key derivations, such as the derivation of traffic keys and IVs;
* see e.g. mbedtls_ssl_tls13_make_traffic_keys().
*
* This function implements one step in this evolution of secrets:
*
* <tt>
* old_secret
* |
* v
* Derive-Secret( ., "derived", "" )
* |
* v
* input -> HKDF-Extract = new_secret
* </tt>
*
* \param hash_alg The identifier for the hash function used for the
* applications of HKDF.
* \param secret_old The address of the buffer holding the old secret
* on function entry. If not \c NULL, this must be a
* readable buffer whose size matches the output size
* of the hash function represented by \p hash_alg.
* If \c NULL, an all \c 0 array will be used instead.
* \param input The address of the buffer holding the additional
* input for the key derivation (e.g., the PSK or the
* ephemeral (EC)DH secret). If not \c NULL, this must be
* a readable buffer whose size \p input_len Bytes.
* If \c NULL, an all \c 0 array will be used instead.
* \param input_len The length of \p input in Bytes.
* \param secret_new The address of the buffer holding the new secret
* on function exit. This must be a writable buffer
* whose size matches the output size of the hash
* function represented by \p hash_alg.
* This may be the same as \p secret_old.
*
* \returns \c 0 on success.
* \returns A negative error code on failure.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_evolve_secret(
psa_algorithm_t hash_alg,
const unsigned char *secret_old,
const unsigned char *input, size_t input_len,
unsigned char *secret_new);
/**
* \brief Calculate a TLS 1.3 PSK binder.
*
* \param ssl The SSL context. This is used for debugging only and may
* be \c NULL if MBEDTLS_DEBUG_C is disabled.
* \param hash_alg The hash algorithm associated to the PSK \p psk.
* \param psk The buffer holding the PSK for which to create a binder.
* \param psk_len The size of \p psk in bytes.
* \param psk_type This indicates whether the PSK \p psk is externally
* provisioned (#MBEDTLS_SSL_TLS1_3_PSK_EXTERNAL) or a
* resumption PSK (#MBEDTLS_SSL_TLS1_3_PSK_RESUMPTION).
* \param transcript The handshake transcript up to the point where the
* PSK binder calculation happens. This must be readable,
* and its size must be equal to the digest size of
* the hash algorithm represented by \p hash_alg.
* \param result The address at which to store the PSK binder on success.
* This must be writable, and its size must be equal to the
* digest size of the hash algorithm represented by
* \p hash_alg.
*
* \returns \c 0 on success.
* \returns A negative error code on failure.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_create_psk_binder(mbedtls_ssl_context *ssl,
const psa_algorithm_t hash_alg,
unsigned char const *psk, size_t psk_len,
int psk_type,
unsigned char const *transcript,
unsigned char *result);
/**
* \bref Setup an SSL transform structure representing the
* record protection mechanism used by TLS 1.3
*
* \param transform The SSL transform structure to be created. This must have
* been initialized through mbedtls_ssl_transform_init() and
* not used in any other way prior to calling this function.
* In particular, this function does not clean up the
* transform structure prior to installing the new keys.
* \param endpoint Indicates whether the transform is for the client
* (value #MBEDTLS_SSL_IS_CLIENT) or the server
* (value #MBEDTLS_SSL_IS_SERVER).
* \param ciphersuite The numerical identifier for the ciphersuite to use.
* This must be one of the identifiers listed in
* ssl_ciphersuites.h.
* \param traffic_keys The key material to use. No reference is stored in
* the SSL transform being generated, and the caller
* should destroy the key material afterwards.
* \param ssl (Debug-only) The SSL context to use for debug output
* in case of failure. This parameter is only needed if
* #MBEDTLS_DEBUG_C is set, and is ignored otherwise.
*
* \return \c 0 on success. In this case, \p transform is ready to
* be used with mbedtls_ssl_transform_decrypt() and
* mbedtls_ssl_transform_encrypt().
* \return A negative error code on failure.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_populate_transform(mbedtls_ssl_transform *transform,
int endpoint,
int ciphersuite,
mbedtls_ssl_key_set const *traffic_keys,
mbedtls_ssl_context *ssl);
/*
* TLS 1.3 key schedule evolutions
*
* Early -> Handshake -> Application
*
* Small wrappers around mbedtls_ssl_tls13_evolve_secret().
*/
/**
* \brief Begin TLS 1.3 key schedule by calculating early secret.
*
* The TLS 1.3 key schedule can be viewed as a simple state machine
* with states Initial -> Early -> Handshake -> Application, and
* this function represents the Initial -> Early transition.
*
* \param ssl The SSL context to operate on.
*
* \returns \c 0 on success.
* \returns A negative error code on failure.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_key_schedule_stage_early(mbedtls_ssl_context *ssl);
/**
* \brief Compute TLS 1.3 resumption master secret.
*
* \param ssl The SSL context to operate on. This must be in
* key schedule stage \c Application, see
* mbedtls_ssl_tls13_key_schedule_stage_application().
*
* \returns \c 0 on success.
* \returns A negative error code on failure.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_compute_resumption_master_secret(mbedtls_ssl_context *ssl);
/**
* \brief Calculate the verify_data value for the client or server TLS 1.3
* Finished message.
*
* \param ssl The SSL context to operate on. This must be in
* key schedule stage \c Handshake, see
* mbedtls_ssl_tls13_key_schedule_stage_application().
* \param dst The address at which to write the verify_data value.
* \param dst_len The size of \p dst in bytes.
* \param actual_len The address at which to store the amount of data
* actually written to \p dst upon success.
* \param which The message to calculate the `verify_data` for:
* - #MBEDTLS_SSL_IS_CLIENT for the Client's Finished message
* - #MBEDTLS_SSL_IS_SERVER for the Server's Finished message
*
* \note Both client and server call this function twice, once to
* generate their own Finished message, and once to verify the
* peer's Finished message.
* \returns \c 0 on success.
* \returns A negative error code on failure.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_calculate_verify_data(mbedtls_ssl_context *ssl,
unsigned char *dst,
size_t dst_len,
size_t *actual_len,
int which);
#if defined(MBEDTLS_SSL_EARLY_DATA)
/**
* \brief Compute TLS 1.3 early transform
*
* \param ssl The SSL context to operate on.
*
* \returns \c 0 on success.
* \returns A negative error code on failure.
*
* \warning The function does not compute the early master secret. Call
* mbedtls_ssl_tls13_key_schedule_stage_early() before to
* call this function to generate the early master secret.
* \note For a client/server endpoint, the function computes only the
* encryption/decryption part of the transform as the decryption/
* encryption part is not defined by the specification (no early
* traffic from the server to the client).
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_compute_early_transform(mbedtls_ssl_context *ssl);
#endif /* MBEDTLS_SSL_EARLY_DATA */
/**
* \brief Compute TLS 1.3 handshake transform
*
* \param ssl The SSL context to operate on. The early secret must have been
* computed.
*
* \returns \c 0 on success.
* \returns A negative error code on failure.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_compute_handshake_transform(mbedtls_ssl_context *ssl);
/**
* \brief Compute TLS 1.3 application transform
*
* \param ssl The SSL context to operate on. The early secret must have been
* computed.
*
* \returns \c 0 on success.
* \returns A negative error code on failure.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_compute_application_transform(mbedtls_ssl_context *ssl);
#if defined(MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED)
/**
* \brief Export TLS 1.3 PSK from handshake context
*
* \param[in] ssl The SSL context to operate on.
* \param[out] psk PSK output pointer.
* \param[out] psk_len Length of PSK.
*
* \returns \c 0 if there is a configured PSK and it was exported
* successfully.
* \returns A negative error code on failure.
*/
MBEDTLS_CHECK_RETURN_CRITICAL
int mbedtls_ssl_tls13_export_handshake_psk(mbedtls_ssl_context *ssl,
unsigned char **psk,
size_t *psk_len);
#endif
#endif /* MBEDTLS_SSL_PROTO_TLS1_3 */
#endif /* MBEDTLS_SSL_TLS1_3_KEYS_H */
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