add simple CertManager example

certmanager/Makefile

@@ -0,0 +1,11 @@
+CC=gcc
+CFLAGS=-Wall
+LIBS= -lwolfssl
+
+certverify: certverify.o
+	$(CC) -o $@ $^ $(CFLAGS) $(LIBS)
+
+.PHONY: clean
+
+clean:
+	rm -f *.o certverify

certmanager/README.md

@@ -0,0 +1,13 @@
+# wolfSSL CertManager Example
+
+This directory contains:
+
+A simple example of using the wolfSSL CertManager to verify a certificate
+in a standalone manner, separate from an SSL/TLS connection.
+
+## Compiling and Running the Example
+
+```
+$ make
+$ ./certverify
+```

certmanager/certverify.c

@@ -0,0 +1,58 @@
+/* standalone.c
+ *
+ * Copyright (C) 2006-2015 wolfSSL Inc.
+ *
+ * This file is part of wolfSSL. (formerly known as CyaSSL)
+ *
+ * wolfSSL is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * wolfSSL is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#include <stdio.h>
+#include <wolfssl/options.h>
+#include <wolfssl/ssl.h>
+#include <wolfssl/wolfcrypt/error-crypt.h>
+
+int main(void)
+{
+    int ret;
+    WOLFSSL_CERT_MANAGER* cm = 0;
+
+    const char* caCert     = "../certs/ca-cert.pem";
+    const char* verifyCert = "../certs/server-cert.pem";
+
+    cm = wolfSSL_CertManagerNew();
+    if (cm == NULL) {
+        printf("wolfSSL_CertManagerNew() failed\n");
+        return -1;
+    }
+
+    ret = wolfSSL_CertManagerLoadCA(cm, caCert, 0);
+    if (ret != SSL_SUCCESS) {
+        printf("wolfSSL_CertManagerLoadCA() failed (%d): %s\n",
+                ret, wc_GetErrorString(ret));
+        wolfSSL_CertManagerFree(cm);
+        return -1;
+    }
+
+    ret = wolfSSL_CertManagerVerify(cm, verifyCert, SSL_FILETYPE_PEM);
+    if (ret != SSL_SUCCESS) {
+        printf("wolfSSL_CertManagerVerify() failed (%d): %s\n",
+                ret, wc_GetErrorString(ret));
+        wolfSSL_CertManagerFree(cm);
+        return -1;
+    }
+    printf("Verification Successful!\n");
+}
+