add method to check if CRL is enabled in native wolfSSL

examples/Client.java

@@ -340,6 +340,7 @@ public class Client {
             ssl = new WolfSSLSession(sslCtx);
 
             /* enable/load CRL functionality */
+            if (WolfSSL.isEnabledCRL() == 1) {
                 ret = ssl.enableCRL(WolfSSL.WOLFSSL_CRL_CHECKALL);
                 if (ret != WolfSSL.SSL_SUCCESS) {
                     System.out.println("failed to enable CRL check");
@@ -347,8 +348,8 @@ public class Client {
                 }
                 ret = ssl.loadCRL(crlPemDir, WolfSSL.SSL_FILETYPE_PEM, 0);
                 if (ret != WolfSSL.SSL_SUCCESS) {
-                System.out.println("can't load CRL, check CRL file and date " +
-                        "validity");
+                    System.out.println("can't load CRL, check CRL file and " +
+                            "date validity");
                     System.exit(1);
                 }
                 MyMissingCRLCallback crlCb = new MyMissingCRLCallback();
@@ -357,6 +358,7 @@ public class Client {
                     System.out.println("can't set CRL callback");
                     System.exit(1);
                 }
+            }
 
             /* open Socket */
             if (doDTLS == 1) {

examples/Server.java

@@ -351,6 +351,7 @@ public class Server {
                 }
 
                 /* enable/load CRL functionality */
+                if (WolfSSL.isEnabledCRL() == 1) {
                     ret = ssl.enableCRL(0);
                     if (ret != WolfSSL.SSL_SUCCESS) {
                         System.out.println("failed to enable CRL, ret = "
@@ -384,6 +385,7 @@ public class Server {
                                 + ret);
                         System.exit(1);
                     }
+                }
 
                 if (useIOCallbacks || (doDTLS == 1)) {
                     /* register I/O callbacks */

native/com_wolfssl_WolfSSL.c

@@ -409,3 +409,13 @@ JNIEXPORT jint JNICALL Java_com_wolfssl_WolfSSL_getHmacMaxSize
     return MAX_DIGEST_SIZE;
 }
 
+JNIEXPORT jint JNICALL Java_com_wolfssl_WolfSSL_isEnabledCRL
+  (JNIEnv* jenv, jclass jcl)
+{
+#ifdef HAVE_CRL
+    return 1;
+#else
+    return 0;
+#endif
+}
+

native/com_wolfssl_WolfSSL.h

@@ -391,6 +391,14 @@ JNIEXPORT jbyteArray JNICALL Java_com_wolfssl_WolfSSL_x509_1getDer
 JNIEXPORT jint JNICALL Java_com_wolfssl_WolfSSL_getHmacMaxSize
   (JNIEnv *, jclass);
 
+/*
+ * Class:     com_wolfssl_WolfSSL
+ * Method:    isEnabledCRL
+ * Signature: ()I
+ */
+JNIEXPORT jint JNICALL Java_com_wolfssl_WolfSSL_isEnabledCRL
+  (JNIEnv *, jclass);
+
 #ifdef __cplusplus
 }
 #endif

src/java/com/wolfssl/WolfSSL.java

@@ -587,5 +587,12 @@ public class WolfSSL {
      */
     public static native int getHmacMaxSize();
 
+    /**
+     * Checks if CRL support is enabled in wolfSSL native library.
+     *
+     * @return 1 if enabled, 0 if not compiled in
+     */
+    public static native int isEnabledCRL();
+
 } /* end WolfSSL */