Make many fields of X.509 structures public

The structures mbedtls_x509_time, mbedtls_x509_crl_entry, mbedtls_x509_crl,
mbedtls_x509_crt, mbedtls_x509_san_other_name,
mbedtls_x509_subject_alternative_name, mbedtls_x509_csr are designed to
expose the result of parsing X.509 data. Document many of their fields as
being publicly readable.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/include/mbedtls/x509_crt.h b/include/mbedtls/x509_crt.h
index 49211a9..6731100 100644
--- a/include/mbedtls/x509_crt.h
+++ b/include/mbedtls/x509_crt.h
@@ -45,36 +45,40 @@
 
 /**
  * Container for an X.509 certificate. The certificate may be chained.
+ *
+ * Some fields of this structure are publicly readable. Do not modify
+ * them except via Mbed TLS library functions: the effect of modifying
+ * those fields or the data that those fields points to is unspecified.
  */
 typedef struct mbedtls_x509_crt
 {
     int MBEDTLS_PRIVATE(own_buffer);                     /**< Indicates if \c raw is owned
                                          *   by the structure or not.        */
-    mbedtls_x509_buf MBEDTLS_PRIVATE(raw);               /**< The raw certificate data (DER). */
-    mbedtls_x509_buf MBEDTLS_PRIVATE(tbs);               /**< The raw certificate body (DER). The part that is To Be Signed. */
+    mbedtls_x509_buf raw;               /**< The raw certificate data (DER). */
+    mbedtls_x509_buf tbs;               /**< The raw certificate body (DER). The part that is To Be Signed. */
 
-    int MBEDTLS_PRIVATE(version);                /**< The X.509 version. (1=v1, 2=v2, 3=v3) */
-    mbedtls_x509_buf MBEDTLS_PRIVATE(serial);            /**< Unique id for certificate issued by a specific CA. */
-    mbedtls_x509_buf MBEDTLS_PRIVATE(sig_oid);           /**< Signature algorithm, e.g. sha1RSA */
+    int version;                /**< The X.509 version. (1=v1, 2=v2, 3=v3) */
+    mbedtls_x509_buf serial;            /**< Unique id for certificate issued by a specific CA. */
+    mbedtls_x509_buf sig_oid;           /**< Signature algorithm, e.g. sha1RSA */
 
-    mbedtls_x509_buf MBEDTLS_PRIVATE(issuer_raw);        /**< The raw issuer data (DER). Used for quick comparison. */
-    mbedtls_x509_buf MBEDTLS_PRIVATE(subject_raw);       /**< The raw subject data (DER). Used for quick comparison. */
+    mbedtls_x509_buf issuer_raw;        /**< The raw issuer data (DER). Used for quick comparison. */
+    mbedtls_x509_buf subject_raw;       /**< The raw subject data (DER). Used for quick comparison. */
 
-    mbedtls_x509_name MBEDTLS_PRIVATE(issuer);           /**< The parsed issuer data (named information object). */
-    mbedtls_x509_name MBEDTLS_PRIVATE(subject);          /**< The parsed subject data (named information object). */
+    mbedtls_x509_name issuer;           /**< The parsed issuer data (named information object). */
+    mbedtls_x509_name subject;          /**< The parsed subject data (named information object). */
 
-    mbedtls_x509_time MBEDTLS_PRIVATE(valid_from);       /**< Start time of certificate validity. */
-    mbedtls_x509_time MBEDTLS_PRIVATE(valid_to);         /**< End time of certificate validity. */
+    mbedtls_x509_time valid_from;       /**< Start time of certificate validity. */
+    mbedtls_x509_time valid_to;         /**< End time of certificate validity. */
 
-    mbedtls_x509_buf MBEDTLS_PRIVATE(pk_raw);
-    mbedtls_pk_context MBEDTLS_PRIVATE(pk);              /**< Container for the public key context. */
+    mbedtls_x509_buf pk_raw;
+    mbedtls_pk_context pk;              /**< Container for the public key context. */
 
-    mbedtls_x509_buf MBEDTLS_PRIVATE(issuer_id);         /**< Optional X.509 v2/v3 issuer unique identifier. */
-    mbedtls_x509_buf MBEDTLS_PRIVATE(subject_id);        /**< Optional X.509 v2/v3 subject unique identifier. */
-    mbedtls_x509_buf MBEDTLS_PRIVATE(v3_ext);            /**< Optional X.509 v3 extensions.  */
-    mbedtls_x509_sequence MBEDTLS_PRIVATE(subject_alt_names);    /**< Optional list of raw entries of Subject Alternative Names extension (currently only dNSName and OtherName are listed). */
+    mbedtls_x509_buf issuer_id;         /**< Optional X.509 v2/v3 issuer unique identifier. */
+    mbedtls_x509_buf subject_id;        /**< Optional X.509 v2/v3 subject unique identifier. */
+    mbedtls_x509_buf v3_ext;            /**< Optional X.509 v3 extensions.  */
+    mbedtls_x509_sequence subject_alt_names;    /**< Optional list of raw entries of Subject Alternative Names extension (currently only dNSName and OtherName are listed). */
 
-    mbedtls_x509_sequence MBEDTLS_PRIVATE(certificate_policies); /**< Optional list of certificate policies (Only anyPolicy is printed and enforced, however the rest of the policies are still listed). */
+    mbedtls_x509_sequence certificate_policies; /**< Optional list of certificate policies (Only anyPolicy is printed and enforced, however the rest of the policies are still listed). */
 
     int MBEDTLS_PRIVATE(ext_types);              /**< Bit string containing detected and parsed extensions */
     int MBEDTLS_PRIVATE(ca_istrue);              /**< Optional Basic Constraint extension value: 1 if this certificate belongs to a CA, 0 otherwise. */
@@ -82,7 +86,7 @@
 
     unsigned int MBEDTLS_PRIVATE(key_usage);     /**< Optional key usage extension value: See the values in x509.h */
 
-    mbedtls_x509_sequence MBEDTLS_PRIVATE(ext_key_usage); /**< Optional list of extended key usage OIDs. */
+    mbedtls_x509_sequence ext_key_usage; /**< Optional list of extended key usage OIDs. */
 
     unsigned char MBEDTLS_PRIVATE(ns_cert_type); /**< Optional Netscape certificate type extension value: See the values in x509.h */
 
@@ -100,6 +104,9 @@
  * OtherName ::= SEQUENCE {
  *      type-id    OBJECT IDENTIFIER,
  *      value      [0] EXPLICIT ANY DEFINED BY type-id }
+ *
+ * Future versions of the library may add new fields to this structure or
+ * to its embedded union and structure.
  */
 typedef struct mbedtls_x509_san_other_name
 {
@@ -108,7 +115,7 @@
      * To check the value of the type id, you should use
      * \p MBEDTLS_OID_CMP with a known OID mbedtls_x509_buf.
      */
-    mbedtls_x509_buf MBEDTLS_PRIVATE(type_id);                   /**< The type id. */
+    mbedtls_x509_buf type_id;                   /**< The type id. */
     union
     {
         /**
@@ -119,26 +126,30 @@
          */
         struct
         {
-            mbedtls_x509_buf MBEDTLS_PRIVATE(oid);               /**< The object identifier. */
-            mbedtls_x509_buf MBEDTLS_PRIVATE(val);               /**< The named value. */
+            mbedtls_x509_buf oid;               /**< The object identifier. */
+            mbedtls_x509_buf val;               /**< The named value. */
         }
-        MBEDTLS_PRIVATE(hardware_module_name);
+        hardware_module_name;
     }
-    MBEDTLS_PRIVATE(value);
+    value;
 }
 mbedtls_x509_san_other_name;
 
 /**
- * A structure for holding the parsed Subject Alternative Name, according to type
+ * A structure for holding the parsed Subject Alternative Name,
+ * according to type.
+ *
+ * Future versions of the library may add new fields to this structure or
+ * to its embedded union and structure.
  */
 typedef struct mbedtls_x509_subject_alternative_name
 {
-    int MBEDTLS_PRIVATE(type);                              /**< The SAN type, value of MBEDTLS_X509_SAN_XXX. */
+    int type;                              /**< The SAN type, value of MBEDTLS_X509_SAN_XXX. */
     union {
-        mbedtls_x509_san_other_name MBEDTLS_PRIVATE(other_name); /**< The otherName supported type. */
-        mbedtls_x509_buf   MBEDTLS_PRIVATE(unstructured_name); /**< The buffer for the un constructed types. Only dnsName currently supported */
+        mbedtls_x509_san_other_name other_name; /**< The otherName supported type. */
+        mbedtls_x509_buf   unstructured_name; /**< The buffer for the un constructed types. Only dnsName currently supported */
     }
-    MBEDTLS_PRIVATE(san); /**< A union of the supported SAN types */
+    san; /**< A union of the supported SAN types */
 }
 mbedtls_x509_subject_alternative_name;