diff --git a/include/mbedtls/debug.h b/include/mbedtls/debug.h
index 922e5bec5..424ed4b3f 100644
--- a/include/mbedtls/debug.h
+++ b/include/mbedtls/debug.h
@@ -149,165 +149,8 @@ extern "C" {
  */
 void mbedtls_debug_set_threshold(int threshold);
 
-/**
- * \brief    Print a message to the debug output. This function is always used
- *          through the MBEDTLS_SSL_DEBUG_MSG() macro, which supplies the ssl
- *          context, file and line number parameters.
- *
- * \param ssl       SSL context
- * \param level     error level of the debug message
- * \param file      file the message has occurred in
- * \param line      line number the message has occurred at
- * \param format    format specifier, in printf format
- * \param ...       variables used by the format specifier
- *
- * \attention       This function is intended for INTERNAL usage within the
- *                  library only.
- */
-void mbedtls_debug_print_msg(const mbedtls_ssl_context *ssl, int level,
-                             const char *file, int line,
-                             const char *format, ...) MBEDTLS_PRINTF_ATTRIBUTE(5, 6);
-
-/**
- * \brief   Print the return value of a function to the debug output. This
- *          function is always used through the MBEDTLS_SSL_DEBUG_RET() macro,
- *          which supplies the ssl context, file and line number parameters.
- *
- * \param ssl       SSL context
- * \param level     error level of the debug message
- * \param file      file the error has occurred in
- * \param line      line number the error has occurred in
- * \param text      the name of the function that returned the error
- * \param ret       the return code value
- *
- * \attention       This function is intended for INTERNAL usage within the
- *                  library only.
- */
-void mbedtls_debug_print_ret(const mbedtls_ssl_context *ssl, int level,
-                             const char *file, int line,
-                             const char *text, int ret);
-
-/**
- * \brief   Output a buffer of size len bytes to the debug output. This function
- *          is always used through the MBEDTLS_SSL_DEBUG_BUF() macro,
- *          which supplies the ssl context, file and line number parameters.
- *
- * \param ssl       SSL context
- * \param level     error level of the debug message
- * \param file      file the error has occurred in
- * \param line      line number the error has occurred in
- * \param text      a name or label for the buffer being dumped. Normally the
- *                  variable or buffer name
- * \param buf       the buffer to be outputted
- * \param len       length of the buffer
- *
- * \attention       This function is intended for INTERNAL usage within the
- *                  library only.
- */
-void mbedtls_debug_print_buf(const mbedtls_ssl_context *ssl, int level,
-                             const char *file, int line, const char *text,
-                             const unsigned char *buf, size_t len);
-
-#if defined(MBEDTLS_BIGNUM_C)
-/**
- * \brief   Print a MPI variable to the debug output. This function is always
- *          used through the MBEDTLS_SSL_DEBUG_MPI() macro, which supplies the
- *          ssl context, file and line number parameters.
- *
- * \param ssl       SSL context
- * \param level     error level of the debug message
- * \param file      file the error has occurred in
- * \param line      line number the error has occurred in
- * \param text      a name or label for the MPI being output. Normally the
- *                  variable name
- * \param X         the MPI variable
- *
- * \attention       This function is intended for INTERNAL usage within the
- *                  library only.
- */
-void mbedtls_debug_print_mpi(const mbedtls_ssl_context *ssl, int level,
-                             const char *file, int line,
-                             const char *text, const mbedtls_mpi *X);
-#endif
-
-#if defined(MBEDTLS_ECP_LIGHT)
-/**
- * \brief   Print an ECP point to the debug output. This function is always
- *          used through the MBEDTLS_SSL_DEBUG_ECP() macro, which supplies the
- *          ssl context, file and line number parameters.
- *
- * \param ssl       SSL context
- * \param level     error level of the debug message
- * \param file      file the error has occurred in
- * \param line      line number the error has occurred in
- * \param text      a name or label for the ECP point being output. Normally the
- *                  variable name
- * \param X         the ECP point
- *
- * \attention       This function is intended for INTERNAL usage within the
- *                  library only.
- */
-void mbedtls_debug_print_ecp(const mbedtls_ssl_context *ssl, int level,
-                             const char *file, int line,
-                             const char *text, const mbedtls_ecp_point *X);
-#endif
-
-#if defined(MBEDTLS_X509_CRT_PARSE_C) && !defined(MBEDTLS_X509_REMOVE_INFO)
-/**
- * \brief   Print a X.509 certificate structure to the debug output. This
- *          function is always used through the MBEDTLS_SSL_DEBUG_CRT() macro,
- *          which supplies the ssl context, file and line number parameters.
- *
- * \param ssl       SSL context
- * \param level     error level of the debug message
- * \param file      file the error has occurred in
- * \param line      line number the error has occurred in
- * \param text      a name or label for the certificate being output
- * \param crt       X.509 certificate structure
- *
- * \attention       This function is intended for INTERNAL usage within the
- *                  library only.
- */
-void mbedtls_debug_print_crt(const mbedtls_ssl_context *ssl, int level,
-                             const char *file, int line,
-                             const char *text, const mbedtls_x509_crt *crt);
-#endif
-
-/* Note: the MBEDTLS_ECDH_C guard here is mandatory because this debug function
-         only works for the built-in implementation. */
-#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_ANY_ENABLED) && \
-    defined(MBEDTLS_ECDH_C)
-typedef enum {
-    MBEDTLS_DEBUG_ECDH_Q,
-    MBEDTLS_DEBUG_ECDH_QP,
-    MBEDTLS_DEBUG_ECDH_Z,
-} mbedtls_debug_ecdh_attr;
-
-/**
- * \brief   Print a field of the ECDH structure in the SSL context to the debug
- *          output. This function is always used through the
- *          MBEDTLS_SSL_DEBUG_ECDH() macro, which supplies the ssl context, file
- *          and line number parameters.
- *
- * \param ssl       SSL context
- * \param level     error level of the debug message
- * \param file      file the error has occurred in
- * \param line      line number the error has occurred in
- * \param ecdh      the ECDH context
- * \param attr      the identifier of the attribute being output
- *
- * \attention       This function is intended for INTERNAL usage within the
- *                  library only.
- */
-void mbedtls_debug_printf_ecdh(const mbedtls_ssl_context *ssl, int level,
-                               const char *file, int line,
-                               const mbedtls_ecdh_context *ecdh,
-                               mbedtls_debug_ecdh_attr attr);
-#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_ANY_ENABLED &&
-          MBEDTLS_ECDH_C */
-
 #ifdef __cplusplus
 }
 #endif
 
-#endif /* debug.h */
+#endif /* MBEDTLS_DEBUG_H */
diff --git a/include/mbedtls/pk.h b/include/mbedtls/pk.h
index 27768bd35..2fdcaefd3 100644
--- a/include/mbedtls/pk.h
+++ b/include/mbedtls/pk.h
@@ -1042,14 +1042,6 @@ int mbedtls_pk_write_pubkey(unsigned char **p, unsigned char *start,
                             const mbedtls_pk_context *key);
 #endif /* MBEDTLS_PK_WRITE_C */
 
-/*
- * Internal module functions. You probably do not want to use these unless you
- * know you do.
- */
-#if defined(MBEDTLS_FS_IO)
-int mbedtls_pk_load_file(const char *path, unsigned char **buf, size_t *n);
-#endif
-
 #if defined(MBEDTLS_USE_PSA_CRYPTO)
 /**
  * \brief           Turn an EC or RSA key into an opaque one.
diff --git a/include/mbedtls/pkcs7.h b/include/mbedtls/pkcs7.h
index 70b25a9c6..e9b482208 100644
--- a/include/mbedtls/pkcs7.h
+++ b/include/mbedtls/pkcs7.h
@@ -41,7 +41,6 @@
 #include "mbedtls/build_info.h"
 
 #include "mbedtls/asn1.h"
-#include "mbedtls/x509.h"
 #include "mbedtls/x509_crt.h"
 
 /**
diff --git a/include/mbedtls/ssl_ciphersuites.h b/include/mbedtls/ssl_ciphersuites.h
index 8cecbb625..f755ef304 100644
--- a/include/mbedtls/ssl_ciphersuites.h
+++ b/include/mbedtls/ssl_ciphersuites.h
@@ -463,18 +463,6 @@ const int *mbedtls_ssl_list_ciphersuites(void);
 const mbedtls_ssl_ciphersuite_t *mbedtls_ssl_ciphersuite_from_string(const char *ciphersuite_name);
 const mbedtls_ssl_ciphersuite_t *mbedtls_ssl_ciphersuite_from_id(int ciphersuite_id);
 
-#if defined(MBEDTLS_PK_C)
-mbedtls_pk_type_t mbedtls_ssl_get_ciphersuite_sig_pk_alg(const mbedtls_ssl_ciphersuite_t *info);
-#if defined(MBEDTLS_USE_PSA_CRYPTO)
-psa_algorithm_t mbedtls_ssl_get_ciphersuite_sig_pk_psa_alg(const mbedtls_ssl_ciphersuite_t *info);
-psa_key_usage_t mbedtls_ssl_get_ciphersuite_sig_pk_psa_usage(const mbedtls_ssl_ciphersuite_t *info);
-#endif
-mbedtls_pk_type_t mbedtls_ssl_get_ciphersuite_sig_alg(const mbedtls_ssl_ciphersuite_t *info);
-#endif
-
-int mbedtls_ssl_ciphersuite_uses_ec(const mbedtls_ssl_ciphersuite_t *info);
-int mbedtls_ssl_ciphersuite_uses_psk(const mbedtls_ssl_ciphersuite_t *info);
-
 static inline const char *mbedtls_ssl_ciphersuite_get_name(const mbedtls_ssl_ciphersuite_t *info)
 {
     return info->MBEDTLS_PRIVATE(name);
@@ -482,133 +470,6 @@ static inline const char *mbedtls_ssl_ciphersuite_get_name(const mbedtls_ssl_cip
 
 size_t mbedtls_ssl_ciphersuite_get_cipher_key_bitlen(const mbedtls_ssl_ciphersuite_t *info);
 
-#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PFS_ENABLED)
-static inline int mbedtls_ssl_ciphersuite_has_pfs(const mbedtls_ssl_ciphersuite_t *info)
-{
-    switch (info->MBEDTLS_PRIVATE(key_exchange)) {
-        case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
-        case MBEDTLS_KEY_EXCHANGE_DHE_PSK:
-        case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
-        case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK:
-        case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
-        case MBEDTLS_KEY_EXCHANGE_ECJPAKE:
-            return 1;
-
-        default:
-            return 0;
-    }
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PFS_ENABLED */
-
-#if defined(MBEDTLS_KEY_EXCHANGE_SOME_NON_PFS_ENABLED)
-static inline int mbedtls_ssl_ciphersuite_no_pfs(const mbedtls_ssl_ciphersuite_t *info)
-{
-    switch (info->MBEDTLS_PRIVATE(key_exchange)) {
-        case MBEDTLS_KEY_EXCHANGE_ECDH_RSA:
-        case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA:
-        case MBEDTLS_KEY_EXCHANGE_RSA:
-        case MBEDTLS_KEY_EXCHANGE_PSK:
-        case MBEDTLS_KEY_EXCHANGE_RSA_PSK:
-            return 1;
-
-        default:
-            return 0;
-    }
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_SOME_NON_PFS_ENABLED */
-
-#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_ENABLED)
-static inline int mbedtls_ssl_ciphersuite_uses_ecdh(const mbedtls_ssl_ciphersuite_t *info)
-{
-    switch (info->MBEDTLS_PRIVATE(key_exchange)) {
-        case MBEDTLS_KEY_EXCHANGE_ECDH_RSA:
-        case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA:
-            return 1;
-
-        default:
-            return 0;
-    }
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDH_ENABLED */
-
-static inline int mbedtls_ssl_ciphersuite_cert_req_allowed(const mbedtls_ssl_ciphersuite_t *info)
-{
-    switch (info->MBEDTLS_PRIVATE(key_exchange)) {
-        case MBEDTLS_KEY_EXCHANGE_RSA:
-        case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
-        case MBEDTLS_KEY_EXCHANGE_ECDH_RSA:
-        case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
-        case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA:
-        case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
-            return 1;
-
-        default:
-            return 0;
-    }
-}
-
-static inline int mbedtls_ssl_ciphersuite_uses_srv_cert(const mbedtls_ssl_ciphersuite_t *info)
-{
-    switch (info->MBEDTLS_PRIVATE(key_exchange)) {
-        case MBEDTLS_KEY_EXCHANGE_RSA:
-        case MBEDTLS_KEY_EXCHANGE_RSA_PSK:
-        case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
-        case MBEDTLS_KEY_EXCHANGE_ECDH_RSA:
-        case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
-        case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA:
-        case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
-            return 1;
-
-        default:
-            return 0;
-    }
-}
-
-#if defined(MBEDTLS_KEY_EXCHANGE_SOME_DHE_ENABLED)
-static inline int mbedtls_ssl_ciphersuite_uses_dhe(const mbedtls_ssl_ciphersuite_t *info)
-{
-    switch (info->MBEDTLS_PRIVATE(key_exchange)) {
-        case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
-        case MBEDTLS_KEY_EXCHANGE_DHE_PSK:
-            return 1;
-
-        default:
-            return 0;
-    }
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_SOME_DHE_ENABLED) */
-
-#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDHE_ENABLED)
-static inline int mbedtls_ssl_ciphersuite_uses_ecdhe(const mbedtls_ssl_ciphersuite_t *info)
-{
-    switch (info->MBEDTLS_PRIVATE(key_exchange)) {
-        case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
-        case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
-        case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK:
-            return 1;
-
-        default:
-            return 0;
-    }
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDHE_ENABLED) */
-
-#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED)
-static inline int mbedtls_ssl_ciphersuite_uses_server_signature(
-    const mbedtls_ssl_ciphersuite_t *info)
-{
-    switch (info->MBEDTLS_PRIVATE(key_exchange)) {
-        case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
-        case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
-        case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
-            return 1;
-
-        default:
-            return 0;
-    }
-}
-#endif /* MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED */
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/mbedtls/x509.h b/include/mbedtls/x509.h
index e2e06679b..be6361285 100644
--- a/include/mbedtls/x509.h
+++ b/include/mbedtls/x509.h
@@ -307,6 +307,7 @@ typedef struct mbedtls_x509_san_list {
 mbedtls_x509_san_list;
 
 /** \} name Structures for parsing X.509 certificates, CRLs and CSRs */
+/** \} addtogroup x509_module */
 
 /**
  * \brief          Store the certificate DN in printable form into buf;
@@ -321,201 +322,7 @@ mbedtls_x509_san_list;
  */
 int mbedtls_x509_dn_gets(char *buf, size_t size, const mbedtls_x509_name *dn);
 
-/**
- * \brief          Return the next relative DN in an X509 name.
- *
- * \note           Intended use is to compare function result to dn->next
- *                 in order to detect boundaries of multi-valued RDNs.
- *
- * \param dn       Current node in the X509 name
- *
- * \return         Pointer to the first attribute-value pair of the
- *                 next RDN in sequence, or NULL if end is reached.
- */
-static inline mbedtls_x509_name *mbedtls_x509_dn_get_next(
-    mbedtls_x509_name *dn)
-{
-    while (dn->MBEDTLS_PRIVATE(next_merged) && dn->next != NULL) {
-        dn = dn->next;
-    }
-    return dn->next;
-}
-
-/**
- * \brief          Store the certificate serial in printable form into buf;
- *                 no more than size characters will be written.
- *
- * \param buf      Buffer to write to
- * \param size     Maximum size of buffer
- * \param serial   The X509 serial to represent
- *
- * \return         The length of the string written (not including the
- *                 terminated nul byte), or a negative error code.
- */
-int mbedtls_x509_serial_gets(char *buf, size_t size, const mbedtls_x509_buf *serial);
-
-/**
- * \brief          Compare pair of mbedtls_x509_time.
- *
- * \param t1       mbedtls_x509_time to compare
- * \param t2       mbedtls_x509_time to compare
- *
- * \return         < 0 if t1 is before t2
- *                   0 if t1 equals t2
- *                 > 0 if t1 is after t2
- */
-int mbedtls_x509_time_cmp(const mbedtls_x509_time *t1, const mbedtls_x509_time *t2);
-
-#if defined(MBEDTLS_HAVE_TIME_DATE)
-/**
- * \brief          Fill mbedtls_x509_time with provided mbedtls_time_t.
- *
- * \param tt       mbedtls_time_t to convert
- * \param now      mbedtls_x509_time to fill with converted mbedtls_time_t
- *
- * \return         \c 0 on success
- * \return         A non-zero return value on failure.
- */
-int mbedtls_x509_time_gmtime(mbedtls_time_t tt, mbedtls_x509_time *now);
-#endif /* MBEDTLS_HAVE_TIME_DATE */
-
-/**
- * \brief          Check a given mbedtls_x509_time against the system time
- *                 and tell if it's in the past.
- *
- * \note           Intended usage is "if( is_past( valid_to ) ) ERROR".
- *                 Hence the return value of 1 if on internal errors.
- *
- * \param to       mbedtls_x509_time to check
- *
- * \return         1 if the given time is in the past or an error occurred,
- *                 0 otherwise.
- */
-int mbedtls_x509_time_is_past(const mbedtls_x509_time *to);
-
-/**
- * \brief          Check a given mbedtls_x509_time against the system time
- *                 and tell if it's in the future.
- *
- * \note           Intended usage is "if( is_future( valid_from ) ) ERROR".
- *                 Hence the return value of 1 if on internal errors.
- *
- * \param from     mbedtls_x509_time to check
- *
- * \return         1 if the given time is in the future or an error occurred,
- *                 0 otherwise.
- */
-int mbedtls_x509_time_is_future(const mbedtls_x509_time *from);
-
-/**
- * \brief          This function parses an item in the SubjectAlternativeNames
- *                 extension. Please note that this function might allocate
- *                 additional memory for a subject alternative name, thus
- *                 mbedtls_x509_free_subject_alt_name has to be called
- *                 to dispose of this additional memory afterwards.
- *
- * \param san_buf  The buffer holding the raw data item of the subject
- *                 alternative name.
- * \param san      The target structure to populate with the parsed presentation
- *                 of the subject alternative name encoded in \p san_buf.
- *
- * \note           Supported GeneralName types, as defined in RFC 5280:
- *                 "rfc822Name", "dnsName", "directoryName",
- *                 "uniformResourceIdentifier" and "hardware_module_name"
- *                 of type "otherName", as defined in RFC 4108.
- *
- * \note           This function should be called on a single raw data of
- *                 subject alternative name. For example, after successful
- *                 certificate parsing, one must iterate on every item in the
- *                 \c crt->subject_alt_names sequence, and pass it to
- *                 this function.
- *
- * \warning        The target structure contains pointers to the raw data of the
- *                 parsed certificate, and its lifetime is restricted by the
- *                 lifetime of the certificate.
- *
- * \return         \c 0 on success
- * \return         #MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE for an unsupported
- *                 SAN type.
- * \return         Another negative value for any other failure.
- */
-int mbedtls_x509_parse_subject_alt_name(const mbedtls_x509_buf *san_buf,
-                                        mbedtls_x509_subject_alternative_name *san);
-/**
- * \brief          Unallocate all data related to subject alternative name
- *
- * \param san      SAN structure - extra memory owned by this structure will be freed
- */
-void mbedtls_x509_free_subject_alt_name(mbedtls_x509_subject_alternative_name *san);
-
-/** \} addtogroup x509_module */
-
-/*
- * Internal module functions. You probably do not want to use these unless you
- * know you do.
- */
-int mbedtls_x509_get_name(unsigned char **p, const unsigned char *end,
-                          mbedtls_x509_name *cur);
-int mbedtls_x509_get_alg_null(unsigned char **p, const unsigned char *end,
-                              mbedtls_x509_buf *alg);
-int mbedtls_x509_get_alg(unsigned char **p, const unsigned char *end,
-                         mbedtls_x509_buf *alg, mbedtls_x509_buf *params);
-#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
-int mbedtls_x509_get_rsassa_pss_params(const mbedtls_x509_buf *params,
-                                       mbedtls_md_type_t *md_alg, mbedtls_md_type_t *mgf_md,
-                                       int *salt_len);
-#endif
-int mbedtls_x509_get_sig(unsigned char **p, const unsigned char *end, mbedtls_x509_buf *sig);
-int mbedtls_x509_get_sig_alg(const mbedtls_x509_buf *sig_oid, const mbedtls_x509_buf *sig_params,
-                             mbedtls_md_type_t *md_alg, mbedtls_pk_type_t *pk_alg,
-                             void **sig_opts);
-int mbedtls_x509_get_time(unsigned char **p, const unsigned char *end,
-                          mbedtls_x509_time *t);
-int mbedtls_x509_get_serial(unsigned char **p, const unsigned char *end,
-                            mbedtls_x509_buf *serial);
-int mbedtls_x509_get_ext(unsigned char **p, const unsigned char *end,
-                         mbedtls_x509_buf *ext, int tag);
-#if !defined(MBEDTLS_X509_REMOVE_INFO)
-int mbedtls_x509_sig_alg_gets(char *buf, size_t size, const mbedtls_x509_buf *sig_oid,
-                              mbedtls_pk_type_t pk_alg, mbedtls_md_type_t md_alg,
-                              const void *sig_opts);
-#endif
-int mbedtls_x509_key_size_helper(char *buf, size_t buf_size, const char *name);
 int mbedtls_x509_string_to_names(mbedtls_asn1_named_data **head, const char *name);
-int mbedtls_x509_set_extension(mbedtls_asn1_named_data **head, const char *oid, size_t oid_len,
-                               int critical, const unsigned char *val,
-                               size_t val_len);
-int mbedtls_x509_write_extensions(unsigned char **p, unsigned char *start,
-                                  mbedtls_asn1_named_data *first);
-int mbedtls_x509_write_names(unsigned char **p, unsigned char *start,
-                             mbedtls_asn1_named_data *first);
-int mbedtls_x509_write_sig(unsigned char **p, unsigned char *start,
-                           const char *oid, size_t oid_len,
-                           unsigned char *sig, size_t size,
-                           mbedtls_pk_type_t pk_alg);
-int mbedtls_x509_get_ns_cert_type(unsigned char **p,
-                                  const unsigned char *end,
-                                  unsigned char *ns_cert_type);
-int mbedtls_x509_get_key_usage(unsigned char **p,
-                               const unsigned char *end,
-                               unsigned int *key_usage);
-int mbedtls_x509_get_subject_alt_name(unsigned char **p,
-                                      const unsigned char *end,
-                                      mbedtls_x509_sequence *subject_alt_name);
-int mbedtls_x509_get_subject_alt_name_ext(unsigned char **p,
-                                          const unsigned char *end,
-                                          mbedtls_x509_sequence *subject_alt_name);
-int mbedtls_x509_info_subject_alt_name(char **buf, size_t *size,
-                                       const mbedtls_x509_sequence
-                                       *subject_alt_name,
-                                       const char *prefix);
-int mbedtls_x509_info_cert_type(char **buf, size_t *size,
-                                unsigned char ns_cert_type);
-int mbedtls_x509_info_key_usage(char **buf, size_t *size,
-                                unsigned int key_usage);
-
-int mbedtls_x509_write_set_san_common(mbedtls_asn1_named_data **extensions,
-                                      const mbedtls_x509_san_list *san_list);
 
 /**
  * \brief          This function parses a CN string as an IP address.
@@ -547,4 +354,4 @@ size_t mbedtls_x509_crt_parse_cn_inet_pton(const char *cn, void *dst);
 }
 #endif
 
-#endif /* x509.h */
+#endif /* MBEDTLS_X509_H */
diff --git a/library/debug.c b/library/debug.c
index a9d58e55b..c36ed3c5c 100644
--- a/library/debug.c
+++ b/library/debug.c
@@ -11,7 +11,7 @@
 
 #include "mbedtls/platform.h"
 
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 
 #include <stdarg.h>
diff --git a/library/debug_internal.h b/library/debug_internal.h
new file mode 100644
index 000000000..4523b4633
--- /dev/null
+++ b/library/debug_internal.h
@@ -0,0 +1,172 @@
+/**
+ * \file debug_internal.h
+ *
+ * \brief Internal part of the public "debug.h".
+ */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+#ifndef MBEDTLS_DEBUG_INTERNAL_H
+#define MBEDTLS_DEBUG_INTERNAL_H
+
+#include "mbedtls/debug.h"
+
+/**
+ * \brief    Print a message to the debug output. This function is always used
+ *          through the MBEDTLS_SSL_DEBUG_MSG() macro, which supplies the ssl
+ *          context, file and line number parameters.
+ *
+ * \param ssl       SSL context
+ * \param level     error level of the debug message
+ * \param file      file the message has occurred in
+ * \param line      line number the message has occurred at
+ * \param format    format specifier, in printf format
+ * \param ...       variables used by the format specifier
+ *
+ * \attention       This function is intended for INTERNAL usage within the
+ *                  library only.
+ */
+void mbedtls_debug_print_msg(const mbedtls_ssl_context *ssl, int level,
+                             const char *file, int line,
+                             const char *format, ...) MBEDTLS_PRINTF_ATTRIBUTE(5, 6);
+
+/**
+ * \brief   Print the return value of a function to the debug output. This
+ *          function is always used through the MBEDTLS_SSL_DEBUG_RET() macro,
+ *          which supplies the ssl context, file and line number parameters.
+ *
+ * \param ssl       SSL context
+ * \param level     error level of the debug message
+ * \param file      file the error has occurred in
+ * \param line      line number the error has occurred in
+ * \param text      the name of the function that returned the error
+ * \param ret       the return code value
+ *
+ * \attention       This function is intended for INTERNAL usage within the
+ *                  library only.
+ */
+void mbedtls_debug_print_ret(const mbedtls_ssl_context *ssl, int level,
+                             const char *file, int line,
+                             const char *text, int ret);
+
+/**
+ * \brief   Output a buffer of size len bytes to the debug output. This function
+ *          is always used through the MBEDTLS_SSL_DEBUG_BUF() macro,
+ *          which supplies the ssl context, file and line number parameters.
+ *
+ * \param ssl       SSL context
+ * \param level     error level of the debug message
+ * \param file      file the error has occurred in
+ * \param line      line number the error has occurred in
+ * \param text      a name or label for the buffer being dumped. Normally the
+ *                  variable or buffer name
+ * \param buf       the buffer to be outputted
+ * \param len       length of the buffer
+ *
+ * \attention       This function is intended for INTERNAL usage within the
+ *                  library only.
+ */
+void mbedtls_debug_print_buf(const mbedtls_ssl_context *ssl, int level,
+                             const char *file, int line, const char *text,
+                             const unsigned char *buf, size_t len);
+
+#if defined(MBEDTLS_BIGNUM_C)
+/**
+ * \brief   Print a MPI variable to the debug output. This function is always
+ *          used through the MBEDTLS_SSL_DEBUG_MPI() macro, which supplies the
+ *          ssl context, file and line number parameters.
+ *
+ * \param ssl       SSL context
+ * \param level     error level of the debug message
+ * \param file      file the error has occurred in
+ * \param line      line number the error has occurred in
+ * \param text      a name or label for the MPI being output. Normally the
+ *                  variable name
+ * \param X         the MPI variable
+ *
+ * \attention       This function is intended for INTERNAL usage within the
+ *                  library only.
+ */
+void mbedtls_debug_print_mpi(const mbedtls_ssl_context *ssl, int level,
+                             const char *file, int line,
+                             const char *text, const mbedtls_mpi *X);
+#endif
+
+#if defined(MBEDTLS_ECP_LIGHT)
+/**
+ * \brief   Print an ECP point to the debug output. This function is always
+ *          used through the MBEDTLS_SSL_DEBUG_ECP() macro, which supplies the
+ *          ssl context, file and line number parameters.
+ *
+ * \param ssl       SSL context
+ * \param level     error level of the debug message
+ * \param file      file the error has occurred in
+ * \param line      line number the error has occurred in
+ * \param text      a name or label for the ECP point being output. Normally the
+ *                  variable name
+ * \param X         the ECP point
+ *
+ * \attention       This function is intended for INTERNAL usage within the
+ *                  library only.
+ */
+void mbedtls_debug_print_ecp(const mbedtls_ssl_context *ssl, int level,
+                             const char *file, int line,
+                             const char *text, const mbedtls_ecp_point *X);
+#endif
+
+#if defined(MBEDTLS_X509_CRT_PARSE_C) && !defined(MBEDTLS_X509_REMOVE_INFO)
+/**
+ * \brief   Print a X.509 certificate structure to the debug output. This
+ *          function is always used through the MBEDTLS_SSL_DEBUG_CRT() macro,
+ *          which supplies the ssl context, file and line number parameters.
+ *
+ * \param ssl       SSL context
+ * \param level     error level of the debug message
+ * \param file      file the error has occurred in
+ * \param line      line number the error has occurred in
+ * \param text      a name or label for the certificate being output
+ * \param crt       X.509 certificate structure
+ *
+ * \attention       This function is intended for INTERNAL usage within the
+ *                  library only.
+ */
+void mbedtls_debug_print_crt(const mbedtls_ssl_context *ssl, int level,
+                             const char *file, int line,
+                             const char *text, const mbedtls_x509_crt *crt);
+#endif
+
+/* Note: the MBEDTLS_ECDH_C guard here is mandatory because this debug function
+         only works for the built-in implementation. */
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_ANY_ENABLED) && \
+    defined(MBEDTLS_ECDH_C)
+typedef enum {
+    MBEDTLS_DEBUG_ECDH_Q,
+    MBEDTLS_DEBUG_ECDH_QP,
+    MBEDTLS_DEBUG_ECDH_Z,
+} mbedtls_debug_ecdh_attr;
+
+/**
+ * \brief   Print a field of the ECDH structure in the SSL context to the debug
+ *          output. This function is always used through the
+ *          MBEDTLS_SSL_DEBUG_ECDH() macro, which supplies the ssl context, file
+ *          and line number parameters.
+ *
+ * \param ssl       SSL context
+ * \param level     error level of the debug message
+ * \param file      file the error has occurred in
+ * \param line      line number the error has occurred in
+ * \param ecdh      the ECDH context
+ * \param attr      the identifier of the attribute being output
+ *
+ * \attention       This function is intended for INTERNAL usage within the
+ *                  library only.
+ */
+void mbedtls_debug_printf_ecdh(const mbedtls_ssl_context *ssl, int level,
+                               const char *file, int line,
+                               const mbedtls_ecdh_context *ecdh,
+                               mbedtls_debug_ecdh_attr attr);
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDH_OR_ECDHE_ANY_ENABLED &&
+          MBEDTLS_ECDH_C */
+
+#endif /* MBEDTLS_DEBUG_INTERNAL_H */
diff --git a/library/pk_internal.h b/library/pk_internal.h
index 3d5adf8de..da6c7f1b4 100644
--- a/library/pk_internal.h
+++ b/library/pk_internal.h
@@ -144,4 +144,8 @@ MBEDTLS_STATIC_TESTABLE int mbedtls_pk_parse_key_pkcs8_encrypted_der(
     int (*f_rng)(void *, unsigned char *, size_t), void *p_rng);
 #endif
 
+#if defined(MBEDTLS_FS_IO)
+int mbedtls_pk_load_file(const char *path, unsigned char **buf, size_t *n);
+#endif
+
 #endif /* MBEDTLS_PK_INTERNAL_H */
diff --git a/library/pkcs7.c b/library/pkcs7.c
index 0869c2e07..3aac662ba 100644
--- a/library/pkcs7.c
+++ b/library/pkcs7.c
@@ -7,7 +7,7 @@
 #include "mbedtls/build_info.h"
 #if defined(MBEDTLS_PKCS7_C)
 #include "mbedtls/pkcs7.h"
-#include "mbedtls/x509.h"
+#include "x509_internal.h"
 #include "mbedtls/asn1.h"
 #include "mbedtls/x509_crt.h"
 #include "mbedtls/x509_crl.h"
diff --git a/library/ssl_ciphersuites_internal.h b/library/ssl_ciphersuites_internal.h
new file mode 100644
index 000000000..27ff72106
--- /dev/null
+++ b/library/ssl_ciphersuites_internal.h
@@ -0,0 +1,154 @@
+/**
+ * \file ssl_ciphersuites_internal.h
+ *
+ * \brief Internal part of the public "ssl_ciphersuites.h".
+ */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+#ifndef MBEDTLS_SSL_CIPHERSUITES_INTERNAL_H
+#define MBEDTLS_SSL_CIPHERSUITES_INTERNAL_H
+
+#include "mbedtls/pk.h"
+
+#if defined(MBEDTLS_PK_C)
+mbedtls_pk_type_t mbedtls_ssl_get_ciphersuite_sig_pk_alg(const mbedtls_ssl_ciphersuite_t *info);
+#if defined(MBEDTLS_USE_PSA_CRYPTO)
+psa_algorithm_t mbedtls_ssl_get_ciphersuite_sig_pk_psa_alg(const mbedtls_ssl_ciphersuite_t *info);
+psa_key_usage_t mbedtls_ssl_get_ciphersuite_sig_pk_psa_usage(const mbedtls_ssl_ciphersuite_t *info);
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
+mbedtls_pk_type_t mbedtls_ssl_get_ciphersuite_sig_alg(const mbedtls_ssl_ciphersuite_t *info);
+#endif /* MBEDTLS_PK_C */
+
+int mbedtls_ssl_ciphersuite_uses_ec(const mbedtls_ssl_ciphersuite_t *info);
+int mbedtls_ssl_ciphersuite_uses_psk(const mbedtls_ssl_ciphersuite_t *info);
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_PFS_ENABLED)
+static inline int mbedtls_ssl_ciphersuite_has_pfs(const mbedtls_ssl_ciphersuite_t *info)
+{
+    switch (info->MBEDTLS_PRIVATE(key_exchange)) {
+        case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
+        case MBEDTLS_KEY_EXCHANGE_DHE_PSK:
+        case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
+        case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK:
+        case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
+        case MBEDTLS_KEY_EXCHANGE_ECJPAKE:
+            return 1;
+
+        default:
+            return 0;
+    }
+}
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_PFS_ENABLED */
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_NON_PFS_ENABLED)
+static inline int mbedtls_ssl_ciphersuite_no_pfs(const mbedtls_ssl_ciphersuite_t *info)
+{
+    switch (info->MBEDTLS_PRIVATE(key_exchange)) {
+        case MBEDTLS_KEY_EXCHANGE_ECDH_RSA:
+        case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA:
+        case MBEDTLS_KEY_EXCHANGE_RSA:
+        case MBEDTLS_KEY_EXCHANGE_PSK:
+        case MBEDTLS_KEY_EXCHANGE_RSA_PSK:
+            return 1;
+
+        default:
+            return 0;
+    }
+}
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_NON_PFS_ENABLED */
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDH_ENABLED)
+static inline int mbedtls_ssl_ciphersuite_uses_ecdh(const mbedtls_ssl_ciphersuite_t *info)
+{
+    switch (info->MBEDTLS_PRIVATE(key_exchange)) {
+        case MBEDTLS_KEY_EXCHANGE_ECDH_RSA:
+        case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA:
+            return 1;
+
+        default:
+            return 0;
+    }
+}
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDH_ENABLED */
+
+static inline int mbedtls_ssl_ciphersuite_cert_req_allowed(const mbedtls_ssl_ciphersuite_t *info)
+{
+    switch (info->MBEDTLS_PRIVATE(key_exchange)) {
+        case MBEDTLS_KEY_EXCHANGE_RSA:
+        case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
+        case MBEDTLS_KEY_EXCHANGE_ECDH_RSA:
+        case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
+        case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA:
+        case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
+            return 1;
+
+        default:
+            return 0;
+    }
+}
+
+static inline int mbedtls_ssl_ciphersuite_uses_srv_cert(const mbedtls_ssl_ciphersuite_t *info)
+{
+    switch (info->MBEDTLS_PRIVATE(key_exchange)) {
+        case MBEDTLS_KEY_EXCHANGE_RSA:
+        case MBEDTLS_KEY_EXCHANGE_RSA_PSK:
+        case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
+        case MBEDTLS_KEY_EXCHANGE_ECDH_RSA:
+        case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
+        case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA:
+        case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
+            return 1;
+
+        default:
+            return 0;
+    }
+}
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_DHE_ENABLED)
+static inline int mbedtls_ssl_ciphersuite_uses_dhe(const mbedtls_ssl_ciphersuite_t *info)
+{
+    switch (info->MBEDTLS_PRIVATE(key_exchange)) {
+        case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
+        case MBEDTLS_KEY_EXCHANGE_DHE_PSK:
+            return 1;
+
+        default:
+            return 0;
+    }
+}
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_DHE_ENABLED) */
+
+#if defined(MBEDTLS_KEY_EXCHANGE_SOME_ECDHE_ENABLED)
+static inline int mbedtls_ssl_ciphersuite_uses_ecdhe(const mbedtls_ssl_ciphersuite_t *info)
+{
+    switch (info->MBEDTLS_PRIVATE(key_exchange)) {
+        case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
+        case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
+        case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK:
+            return 1;
+
+        default:
+            return 0;
+    }
+}
+#endif /* MBEDTLS_KEY_EXCHANGE_SOME_ECDHE_ENABLED) */
+
+#if defined(MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED)
+static inline int mbedtls_ssl_ciphersuite_uses_server_signature(
+    const mbedtls_ssl_ciphersuite_t *info)
+{
+    switch (info->MBEDTLS_PRIVATE(key_exchange)) {
+        case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
+        case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
+        case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
+            return 1;
+
+        default:
+            return 0;
+    }
+}
+#endif /* MBEDTLS_KEY_EXCHANGE_WITH_SERVER_SIGNATURE_ENABLED */
+
+#endif /* MBEDTLS_SSL_CIPHERSUITES_INTERNAL_H */
diff --git a/library/ssl_client.c b/library/ssl_client.c
index d585ca524..6d988a837 100644
--- a/library/ssl_client.c
+++ b/library/ssl_client.c
@@ -12,7 +12,7 @@
 
 #include <string.h>
 
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/platform.h"
 
diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index c9632f97b..16cd62e28 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -44,6 +44,8 @@
 #endif
 
 #include "mbedtls/pk.h"
+#include "ssl_ciphersuites_internal.h"
+#include "x509_internal.h"
 #include "pk_internal.h"
 #include "common.h"
 
diff --git a/library/ssl_msg.c b/library/ssl_msg.c
index 20501c940..ccf3ecaca 100644
--- a/library/ssl_msg.c
+++ b/library/ssl_msg.c
@@ -18,7 +18,7 @@
 
 #include "mbedtls/ssl.h"
 #include "ssl_misc.h"
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/platform_util.h"
 #include "mbedtls/version.h"
diff --git a/library/ssl_tls.c b/library/ssl_tls.c
index c952add9b..ecfecf277 100644
--- a/library/ssl_tls.c
+++ b/library/ssl_tls.c
@@ -20,7 +20,7 @@
 #include "ssl_debug_helpers.h"
 #include "ssl_misc.h"
 
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/platform_util.h"
 #include "mbedtls/version.h"
diff --git a/library/ssl_tls12_client.c b/library/ssl_tls12_client.c
index 0c5af87f4..c3a803706 100644
--- a/library/ssl_tls12_client.c
+++ b/library/ssl_tls12_client.c
@@ -14,7 +14,7 @@
 #include "mbedtls/ssl.h"
 #include "ssl_client.h"
 #include "ssl_misc.h"
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/constant_time.h"
 
diff --git a/library/ssl_tls12_server.c b/library/ssl_tls12_server.c
index 5a9f6ca4e..f242faa1e 100644
--- a/library/ssl_tls12_server.c
+++ b/library/ssl_tls12_server.c
@@ -13,7 +13,7 @@
 
 #include "mbedtls/ssl.h"
 #include "ssl_misc.h"
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/platform_util.h"
 #include "constant_time_internal.h"
diff --git a/library/ssl_tls13_client.c b/library/ssl_tls13_client.c
index 76f0f1896..dc0ea7861 100644
--- a/library/ssl_tls13_client.c
+++ b/library/ssl_tls13_client.c
@@ -11,7 +11,7 @@
 
 #include <string.h>
 
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/platform.h"
 
diff --git a/library/ssl_tls13_generic.c b/library/ssl_tls13_generic.c
index 04ecd8b43..2666067b7 100644
--- a/library/ssl_tls13_generic.c
+++ b/library/ssl_tls13_generic.c
@@ -12,7 +12,7 @@
 #include <string.h>
 
 #include "mbedtls/error.h"
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/oid.h"
 #include "mbedtls/platform.h"
 #include "mbedtls/constant_time.h"
diff --git a/library/ssl_tls13_keys.c b/library/ssl_tls13_keys.c
index edb453c3e..739414ea2 100644
--- a/library/ssl_tls13_keys.c
+++ b/library/ssl_tls13_keys.c
@@ -13,7 +13,7 @@
 #include <string.h>
 
 #include "mbedtls/hkdf.h"
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/platform.h"
 
diff --git a/library/ssl_tls13_server.c b/library/ssl_tls13_server.c
index 8bd70ef02..c8370327e 100644
--- a/library/ssl_tls13_server.c
+++ b/library/ssl_tls13_server.c
@@ -9,7 +9,7 @@
 
 #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_PROTO_TLS1_3)
 
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/platform.h"
 #include "mbedtls/constant_time.h"
diff --git a/library/x509.c b/library/x509.c
index b7b71f33c..f97fb4458 100644
--- a/library/x509.c
+++ b/library/x509.c
@@ -19,7 +19,7 @@
 
 #if defined(MBEDTLS_X509_USE_C)
 
-#include "mbedtls/x509.h"
+#include "x509_internal.h"
 #include "mbedtls/asn1.h"
 #include "mbedtls/error.h"
 #include "mbedtls/oid.h"
diff --git a/library/x509_create.c b/library/x509_create.c
index f7a17e712..839b5df22 100644
--- a/library/x509_create.c
+++ b/library/x509_create.c
@@ -9,7 +9,7 @@
 
 #if defined(MBEDTLS_X509_CREATE_C)
 
-#include "mbedtls/x509.h"
+#include "x509_internal.h"
 #include "mbedtls/asn1write.h"
 #include "mbedtls/error.h"
 #include "mbedtls/oid.h"
diff --git a/library/x509_crl.c b/library/x509_crl.c
index fdbad238a..7901992e2 100644
--- a/library/x509_crl.c
+++ b/library/x509_crl.c
@@ -20,6 +20,7 @@
 #if defined(MBEDTLS_X509_CRL_PARSE_C)
 
 #include "mbedtls/x509_crl.h"
+#include "x509_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/oid.h"
 #include "mbedtls/platform_util.h"
diff --git a/library/x509_crt.c b/library/x509_crt.c
index 84b92a891..7f0160a00 100644
--- a/library/x509_crt.c
+++ b/library/x509_crt.c
@@ -22,6 +22,7 @@
 #if defined(MBEDTLS_X509_CRT_PARSE_C)
 
 #include "mbedtls/x509_crt.h"
+#include "x509_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/oid.h"
 #include "mbedtls/platform_util.h"
diff --git a/library/x509_csr.c b/library/x509_csr.c
index 79b158964..813d64466 100644
--- a/library/x509_csr.c
+++ b/library/x509_csr.c
@@ -20,6 +20,7 @@
 #if defined(MBEDTLS_X509_CSR_PARSE_C)
 
 #include "mbedtls/x509_csr.h"
+#include "x509_internal.h"
 #include "mbedtls/error.h"
 #include "mbedtls/oid.h"
 #include "mbedtls/platform_util.h"
diff --git a/library/x509_internal.h b/library/x509_internal.h
new file mode 100644
index 000000000..15e097a15
--- /dev/null
+++ b/library/x509_internal.h
@@ -0,0 +1,213 @@
+/**
+ * \file x509.h
+ *
+ * \brief Internal part of the public "x509.h".
+ */
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+#ifndef MBEDTLS_X509_INTERNAL_H
+#define MBEDTLS_X509_INTERNAL_H
+#include "mbedtls/private_access.h"
+
+#include "mbedtls/build_info.h"
+
+#include "mbedtls/x509.h"
+#include "mbedtls/asn1.h"
+#include "pk_internal.h"
+
+#if defined(MBEDTLS_RSA_C)
+#include "mbedtls/rsa.h"
+#endif
+
+/**
+ * \brief          Return the next relative DN in an X509 name.
+ *
+ * \note           Intended use is to compare function result to dn->next
+ *                 in order to detect boundaries of multi-valued RDNs.
+ *
+ * \param dn       Current node in the X509 name
+ *
+ * \return         Pointer to the first attribute-value pair of the
+ *                 next RDN in sequence, or NULL if end is reached.
+ */
+static inline mbedtls_x509_name *mbedtls_x509_dn_get_next(
+    mbedtls_x509_name *dn)
+{
+    while (dn->MBEDTLS_PRIVATE(next_merged) && dn->next != NULL) {
+        dn = dn->next;
+    }
+    return dn->next;
+}
+
+/**
+ * \brief          Store the certificate serial in printable form into buf;
+ *                 no more than size characters will be written.
+ *
+ * \param buf      Buffer to write to
+ * \param size     Maximum size of buffer
+ * \param serial   The X509 serial to represent
+ *
+ * \return         The length of the string written (not including the
+ *                 terminated nul byte), or a negative error code.
+ */
+int mbedtls_x509_serial_gets(char *buf, size_t size, const mbedtls_x509_buf *serial);
+
+/**
+ * \brief          Compare pair of mbedtls_x509_time.
+ *
+ * \param t1       mbedtls_x509_time to compare
+ * \param t2       mbedtls_x509_time to compare
+ *
+ * \return         < 0 if t1 is before t2
+ *                   0 if t1 equals t2
+ *                 > 0 if t1 is after t2
+ */
+int mbedtls_x509_time_cmp(const mbedtls_x509_time *t1, const mbedtls_x509_time *t2);
+
+#if defined(MBEDTLS_HAVE_TIME_DATE)
+/**
+ * \brief          Fill mbedtls_x509_time with provided mbedtls_time_t.
+ *
+ * \param tt       mbedtls_time_t to convert
+ * \param now      mbedtls_x509_time to fill with converted mbedtls_time_t
+ *
+ * \return         \c 0 on success
+ * \return         A non-zero return value on failure.
+ */
+int mbedtls_x509_time_gmtime(mbedtls_time_t tt, mbedtls_x509_time *now);
+#endif /* MBEDTLS_HAVE_TIME_DATE */
+
+/**
+ * \brief          Check a given mbedtls_x509_time against the system time
+ *                 and tell if it's in the past.
+ *
+ * \note           Intended usage is "if( is_past( valid_to ) ) ERROR".
+ *                 Hence the return value of 1 if on internal errors.
+ *
+ * \param to       mbedtls_x509_time to check
+ *
+ * \return         1 if the given time is in the past or an error occurred,
+ *                 0 otherwise.
+ */
+int mbedtls_x509_time_is_past(const mbedtls_x509_time *to);
+
+/**
+ * \brief          Check a given mbedtls_x509_time against the system time
+ *                 and tell if it's in the future.
+ *
+ * \note           Intended usage is "if( is_future( valid_from ) ) ERROR".
+ *                 Hence the return value of 1 if on internal errors.
+ *
+ * \param from     mbedtls_x509_time to check
+ *
+ * \return         1 if the given time is in the future or an error occurred,
+ *                 0 otherwise.
+ */
+int mbedtls_x509_time_is_future(const mbedtls_x509_time *from);
+
+/**
+ * \brief          This function parses an item in the SubjectAlternativeNames
+ *                 extension. Please note that this function might allocate
+ *                 additional memory for a subject alternative name, thus
+ *                 mbedtls_x509_free_subject_alt_name has to be called
+ *                 to dispose of this additional memory afterwards.
+ *
+ * \param san_buf  The buffer holding the raw data item of the subject
+ *                 alternative name.
+ * \param san      The target structure to populate with the parsed presentation
+ *                 of the subject alternative name encoded in \p san_buf.
+ *
+ * \note           Supported GeneralName types, as defined in RFC 5280:
+ *                 "rfc822Name", "dnsName", "directoryName",
+ *                 "uniformResourceIdentifier" and "hardware_module_name"
+ *                 of type "otherName", as defined in RFC 4108.
+ *
+ * \note           This function should be called on a single raw data of
+ *                 subject alternative name. For example, after successful
+ *                 certificate parsing, one must iterate on every item in the
+ *                 \c crt->subject_alt_names sequence, and pass it to
+ *                 this function.
+ *
+ * \warning        The target structure contains pointers to the raw data of the
+ *                 parsed certificate, and its lifetime is restricted by the
+ *                 lifetime of the certificate.
+ *
+ * \return         \c 0 on success
+ * \return         #MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE for an unsupported
+ *                 SAN type.
+ * \return         Another negative value for any other failure.
+ */
+int mbedtls_x509_parse_subject_alt_name(const mbedtls_x509_buf *san_buf,
+                                        mbedtls_x509_subject_alternative_name *san);
+/**
+ * \brief          Unallocate all data related to subject alternative name
+ *
+ * \param san      SAN structure - extra memory owned by this structure will be freed
+ */
+void mbedtls_x509_free_subject_alt_name(mbedtls_x509_subject_alternative_name *san);
+
+int mbedtls_x509_get_name(unsigned char **p, const unsigned char *end,
+                          mbedtls_x509_name *cur);
+int mbedtls_x509_get_alg_null(unsigned char **p, const unsigned char *end,
+                              mbedtls_x509_buf *alg);
+int mbedtls_x509_get_alg(unsigned char **p, const unsigned char *end,
+                         mbedtls_x509_buf *alg, mbedtls_x509_buf *params);
+#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
+int mbedtls_x509_get_rsassa_pss_params(const mbedtls_x509_buf *params,
+                                       mbedtls_md_type_t *md_alg, mbedtls_md_type_t *mgf_md,
+                                       int *salt_len);
+#endif
+int mbedtls_x509_get_sig(unsigned char **p, const unsigned char *end, mbedtls_x509_buf *sig);
+int mbedtls_x509_get_sig_alg(const mbedtls_x509_buf *sig_oid, const mbedtls_x509_buf *sig_params,
+                             mbedtls_md_type_t *md_alg, mbedtls_pk_type_t *pk_alg,
+                             void **sig_opts);
+int mbedtls_x509_get_time(unsigned char **p, const unsigned char *end,
+                          mbedtls_x509_time *t);
+int mbedtls_x509_get_serial(unsigned char **p, const unsigned char *end,
+                            mbedtls_x509_buf *serial);
+int mbedtls_x509_get_ext(unsigned char **p, const unsigned char *end,
+                         mbedtls_x509_buf *ext, int tag);
+#if !defined(MBEDTLS_X509_REMOVE_INFO)
+int mbedtls_x509_sig_alg_gets(char *buf, size_t size, const mbedtls_x509_buf *sig_oid,
+                              mbedtls_pk_type_t pk_alg, mbedtls_md_type_t md_alg,
+                              const void *sig_opts);
+#endif
+int mbedtls_x509_key_size_helper(char *buf, size_t buf_size, const char *name);
+int mbedtls_x509_set_extension(mbedtls_asn1_named_data **head, const char *oid, size_t oid_len,
+                               int critical, const unsigned char *val,
+                               size_t val_len);
+int mbedtls_x509_write_extensions(unsigned char **p, unsigned char *start,
+                                  mbedtls_asn1_named_data *first);
+int mbedtls_x509_write_names(unsigned char **p, unsigned char *start,
+                             mbedtls_asn1_named_data *first);
+int mbedtls_x509_write_sig(unsigned char **p, unsigned char *start,
+                           const char *oid, size_t oid_len,
+                           unsigned char *sig, size_t size,
+                           mbedtls_pk_type_t pk_alg);
+int mbedtls_x509_get_ns_cert_type(unsigned char **p,
+                                  const unsigned char *end,
+                                  unsigned char *ns_cert_type);
+int mbedtls_x509_get_key_usage(unsigned char **p,
+                               const unsigned char *end,
+                               unsigned int *key_usage);
+int mbedtls_x509_get_subject_alt_name(unsigned char **p,
+                                      const unsigned char *end,
+                                      mbedtls_x509_sequence *subject_alt_name);
+int mbedtls_x509_get_subject_alt_name_ext(unsigned char **p,
+                                          const unsigned char *end,
+                                          mbedtls_x509_sequence *subject_alt_name);
+int mbedtls_x509_info_subject_alt_name(char **buf, size_t *size,
+                                       const mbedtls_x509_sequence
+                                       *subject_alt_name,
+                                       const char *prefix);
+int mbedtls_x509_info_cert_type(char **buf, size_t *size,
+                                unsigned char ns_cert_type);
+int mbedtls_x509_info_key_usage(char **buf, size_t *size,
+                                unsigned int key_usage);
+
+int mbedtls_x509_write_set_san_common(mbedtls_asn1_named_data **extensions,
+                                      const mbedtls_x509_san_list *san_list);
+
+#endif /* MBEDTLS_X509_INTERNAL_H */
diff --git a/library/x509write.c b/library/x509write.c
index d434df507..4704900d3 100644
--- a/library/x509write.c
+++ b/library/x509write.c
@@ -8,6 +8,7 @@
 #if defined(MBEDTLS_X509_CSR_WRITE_C) || defined(MBEDTLS_X509_CRT_WRITE_C)
 
 #include "mbedtls/x509_crt.h"
+#include "x509_internal.h"
 #include "mbedtls/asn1write.h"
 #include "mbedtls/error.h"
 #include "mbedtls/oid.h"
diff --git a/library/x509write_crt.c b/library/x509write_crt.c
index 913b15a70..72f5a10a1 100644
--- a/library/x509write_crt.c
+++ b/library/x509write_crt.c
@@ -16,6 +16,7 @@
 #if defined(MBEDTLS_X509_CRT_WRITE_C)
 
 #include "mbedtls/x509_crt.h"
+#include "x509_internal.h"
 #include "mbedtls/asn1write.h"
 #include "mbedtls/error.h"
 #include "mbedtls/oid.h"
diff --git a/library/x509write_csr.c b/library/x509write_csr.c
index af75e7f72..d3ddbcc03 100644
--- a/library/x509write_csr.c
+++ b/library/x509write_csr.c
@@ -14,7 +14,7 @@
 
 #if defined(MBEDTLS_X509_CSR_WRITE_C)
 
-#include "mbedtls/x509.h"
+#include "x509_internal.h"
 #include "mbedtls/x509_csr.h"
 #include "mbedtls/asn1write.h"
 #include "mbedtls/error.h"
diff --git a/tests/suites/test_suite_debug.function b/tests/suites/test_suite_debug.function
index b9610406b..eeefc9597 100644
--- a/tests/suites/test_suite_debug.function
+++ b/tests/suites/test_suite_debug.function
@@ -1,5 +1,5 @@
 /* BEGIN_HEADER */
-#include "mbedtls/debug.h"
+#include "debug_internal.h"
 #include "string.h"
 #include "mbedtls/pk.h"
 
diff --git a/tests/suites/test_suite_pkcs7.function b/tests/suites/test_suite_pkcs7.function
index 65384a855..4c8bf233e 100644
--- a/tests/suites/test_suite_pkcs7.function
+++ b/tests/suites/test_suite_pkcs7.function
@@ -4,6 +4,7 @@
 #include "mbedtls/x509.h"
 #include "mbedtls/x509_crt.h"
 #include "mbedtls/x509_crl.h"
+#include "x509_internal.h"
 #include "mbedtls/oid.h"
 #include "sys/types.h"
 #include "sys/stat.h"
diff --git a/tests/suites/test_suite_pkwrite.function b/tests/suites/test_suite_pkwrite.function
index 733909ebc..c7600903f 100644
--- a/tests/suites/test_suite_pkwrite.function
+++ b/tests/suites/test_suite_pkwrite.function
@@ -1,5 +1,5 @@
 /* BEGIN_HEADER */
-#include "mbedtls/pk.h"
+#include "pk_internal.h"
 #include "mbedtls/pem.h"
 #include "mbedtls/oid.h"
 #include "psa/crypto_sizes.h"
diff --git a/tests/suites/test_suite_x509parse.function b/tests/suites/test_suite_x509parse.function
index c2a2f556d..66477e0d1 100644
--- a/tests/suites/test_suite_x509parse.function
+++ b/tests/suites/test_suite_x509parse.function
@@ -4,6 +4,7 @@
 #include "mbedtls/x509_crt.h"
 #include "mbedtls/x509_crl.h"
 #include "mbedtls/x509_csr.h"
+#include "x509_internal.h"
 #include "mbedtls/pem.h"
 #include "mbedtls/oid.h"
 #include "mbedtls/base64.h"
diff --git a/tests/suites/test_suite_x509write.function b/tests/suites/test_suite_x509write.function
index 1d8b87ce2..3d84c729f 100644
--- a/tests/suites/test_suite_x509write.function
+++ b/tests/suites/test_suite_x509write.function
@@ -2,6 +2,7 @@
 #include "mbedtls/bignum.h"
 #include "mbedtls/x509_crt.h"
 #include "mbedtls/x509_csr.h"
+#include "x509_internal.h"
 #include "mbedtls/pem.h"
 #include "mbedtls/oid.h"
 #include "mbedtls/rsa.h"