Reduce code size when mbedtls_x509_*_info() unused

Introduce MBEDTLS_X509_INFO to indicate the availability of the
mbedtls_x509_*_info() function and closely related APIs. When this is
not defined, also omit name and description from
mbedtls_oid_descriptor_t, and omit OID arrays, macros, and types that
are entirely unused. This saves several KB of code space.

Change-Id: I056312613379890e0d70e1d08c34171287c0aa17
diff --git a/tests/suites/test_suite_x509parse.function b/tests/suites/test_suite_x509parse.function
index 01b18f6..7ca912b 100644
--- a/tests/suites/test_suite_x509parse.function
+++ b/tests/suites/test_suite_x509parse.function
@@ -171,7 +171,7 @@
  * END_DEPENDENCIES
  */
 
-/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
+/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_INFO:MBEDTLS_X509_CRT_PARSE_C */
 void x509_cert_info( char * crt_file, char * result_str )
 {
     mbedtls_x509_crt   crt;
@@ -194,7 +194,7 @@
 }
 /* END_CASE */
 
-/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRL_PARSE_C */
+/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRL_PARSE_C:MBEDTLS_X509_INFO */
 void mbedtls_x509_crl_info( char * crl_file, char * result_str )
 {
     mbedtls_x509_crl   crl;
@@ -233,7 +233,7 @@
 }
 /* END_CASE */
 
-/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CSR_PARSE_C */
+/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CSR_PARSE_C:MBEDTLS_X509_INFO */
 void mbedtls_x509_csr_info( char * csr_file, char * result_str )
 {
     mbedtls_x509_csr   csr;
@@ -256,7 +256,7 @@
 }
 /* END_CASE */
 
-/* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C */
+/* BEGIN_CASE depends_on:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_X509_INFO */
 void x509_verify_info( int flags, char * prefix, char * result_str )
 {
     char buf[2000];
@@ -422,7 +422,7 @@
 }
 /* END_CASE */
 
-/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C */
+/* BEGIN_CASE depends_on:MBEDTLS_FS_IO:MBEDTLS_X509_CRT_PARSE_C:MBEDTLS_X509_INFO */
 void mbedtls_x509_dn_gets( char * crt_file, char * entity, char * result_str )
 {
     mbedtls_x509_crt   crt;
@@ -510,15 +510,18 @@
 void x509parse_crt( data_t * buf, char * result_str, int result )
 {
     mbedtls_x509_crt   crt;
+#if defined(MBEDTLS_X509_INFO)
     unsigned char output[2000];
     int res;
+#endif
 
     mbedtls_x509_crt_init( &crt );
-    memset( output, 0, 2000 );
 
     TEST_ASSERT( mbedtls_x509_crt_parse_der( &crt, buf->x, buf->len ) == ( result ) );
+#if defined(MBEDTLS_X509_INFO)
     if( ( result ) == 0 )
     {
+        memset( output, 0, 2000 );
         res = mbedtls_x509_crt_info( (char *) output, 2000, "", &crt );
 
         TEST_ASSERT( res != -1 );
@@ -526,14 +529,18 @@
 
         TEST_ASSERT( strcmp( (char *) output, result_str ) == 0 );
     }
+#endif
 
     mbedtls_x509_crt_free( &crt );
     mbedtls_x509_crt_init( &crt );
-    memset( output, 0, 2000 );
 
     TEST_ASSERT( mbedtls_x509_crt_parse_der_nocopy( &crt, buf->x, buf->len ) == ( result ) );
+
+    TEST_ASSERT( mbedtls_x509_crt_parse( &crt, buf->x, buf->len ) == ( result ) );
+#if defined(MBEDTLS_X509_INFO)
     if( ( result ) == 0 )
     {
+        memset( output, 0, 2000 );
         res = mbedtls_x509_crt_info( (char *) output, 2000, "", &crt );
 
         TEST_ASSERT( res != -1 );
@@ -541,13 +548,20 @@
 
         TEST_ASSERT( strcmp( (char *) output, result_str ) == 0 );
     }
+#endif
+
+    mbedtls_x509_crt_free( &crt );
+    mbedtls_x509_crt_init( &crt );
+#if defined(MBEDTLS_X509_INFO)
+    memset( output, 0, 2000 );
+#endif
 
 exit:
     mbedtls_x509_crt_free( &crt );
 }
 /* END_CASE */
 
-/* BEGIN_CASE depends_on:MBEDTLS_X509_CRL_PARSE_C */
+/* BEGIN_CASE depends_on:MBEDTLS_X509_CRL_PARSE_C:MBEDTLS_X509_INFO */
 void x509parse_crl( data_t * buf, char * result_str, int result )
 {
     mbedtls_x509_crl   crl;
@@ -574,7 +588,7 @@
 }
 /* END_CASE */
 
-/* BEGIN_CASE depends_on:MBEDTLS_X509_CSR_PARSE_C */
+/* BEGIN_CASE depends_on:MBEDTLS_X509_CSR_PARSE_C:MBEDTLS_X509_INFO */
 void mbedtls_x509_csr_parse( data_t * csr_der, char * ref_out, int ref_ret )
 {
     mbedtls_x509_csr csr;
@@ -701,7 +715,7 @@
 }
 /* END_CASE */
 
-/* BEGIN_CASE depends_on:MBEDTLS_X509_USE_C */
+/* BEGIN_CASE depends_on:MBEDTLS_X509_USE_C:MBEDTLS_X509_INFO */
 void x509_oid_desc( data_t * buf, char * ref_desc )
 {
     mbedtls_x509_buf oid;