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/programs/x509/cert_write.c b/programs/x509/cert_write.c
index 9a20d63..763f868 100644
--- a/programs/x509/cert_write.c
+++ b/programs/x509/cert_write.c
@@ -514,7 +514,7 @@
         }
 
         ret = mbedtls_x509_dn_gets( issuer_name, sizeof(issuer_name),
-                                 &issuer_crt.MBEDTLS_PRIVATE(subject) );
+                                 &issuer_crt.subject );
         if( ret < 0 )
         {
             mbedtls_strerror( ret, buf, 1024 );
@@ -548,7 +548,7 @@
         }
 
         ret = mbedtls_x509_dn_gets( subject_name, sizeof(subject_name),
-                                 &csr.MBEDTLS_PRIVATE(subject) );
+                                 &csr.subject );
         if( ret < 0 )
         {
             mbedtls_strerror( ret, buf, 1024 );
@@ -558,7 +558,7 @@
         }
 
         opt.subject_name = subject_name;
-        subject_key = &csr.MBEDTLS_PRIVATE(pk);
+        subject_key = &csr.pk;
 
         mbedtls_printf( " ok\n" );
     }
@@ -602,7 +602,7 @@
     //
     if( strlen( opt.issuer_crt ) )
     {
-        if( mbedtls_pk_check_pair( &issuer_crt.MBEDTLS_PRIVATE(pk), issuer_key,
+        if( mbedtls_pk_check_pair( &issuer_crt.pk, issuer_key,
                                    mbedtls_ctr_drbg_random, &ctr_drbg ) != 0 )
         {
             mbedtls_printf( " failed\n  !  issuer_key does not match "