Crypto: New utils to support private key import/export

Console: New /configfamily, /exportfamily

apps/routerconsole/jsp/exportfamily.jsp

@@ -0,0 +1,35 @@
+<%
+try {
+    net.i2p.I2PAppContext ctx = net.i2p.I2PAppContext.getGlobalContext();
+    String family = ctx.getProperty("netdb.family.name");
+    String keypw = ctx.getProperty("netdb.family.keyPassword");
+    String kspw = ctx.getProperty("netdb.family.keystorePassword", "changeit");
+    if (family == null || keypw == null) {
+        response.sendError(404);
+        return;
+    }
+    try {
+        response.setDateHeader("Expires", 0);
+        response.addHeader("Cache-Control", "no-store, max-age=0, no-cache, must-revalidate");
+        response.addHeader("Pragma", "no-cache");
+        String name = "family-" + family + ".crt";
+        response.setContentType("application/x-x509-ca-cert; name=\"" + name + '"');
+        response.addHeader("Content-Disposition", "attachment; filename=\"" + name + '"');
+        java.io.File ks = new java.io.File(ctx.getConfigDir(), "keystore");
+        ks = new java.io.File(ks, "family-" + family + ".ks");
+        java.io.OutputStream cout = response.getOutputStream();
+        net.i2p.crypto.KeyStoreUtil.exportPrivateKey(ks, kspw, family, keypw, cout);
+    } catch (java.security.GeneralSecurityException gse) {
+        throw new java.io.IOException("key error", gse);
+    }
+} catch (java.io.IOException ioe) {
+    // prevent 'Committed' IllegalStateException from Jetty
+    if (!response.isCommitted()) {
+        response.sendError(403, ioe.toString());
+    }  else {
+        // Jetty doesn't log this
+        throw ioe;
+    }
+}
+// don't worry about a newline after this
+%>