Java tutorial
/******************************************************************************* * Copyright (c) 2013-2015 Sierra Wireless and others. * * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * and Eclipse Distribution License v1.0 which accompany this distribution. * * The Eclipse Public License is available at * http://www.eclipse.org/legal/epl-v10.html * and the Eclipse Distribution License is available at * http://www.eclipse.org/org/documents/edl-v10.html. * * Contributors: * Sierra Wireless - initial API and implementation *******************************************************************************/ package org.eclipse.leshan.server.demo.servlet.json; import java.lang.reflect.Type; import java.math.BigInteger; import java.security.AlgorithmParameters; import java.security.KeyFactory; import java.security.NoSuchAlgorithmException; import java.security.PublicKey; import java.security.spec.ECGenParameterSpec; import java.security.spec.ECParameterSpec; import java.security.spec.ECPoint; import java.security.spec.ECPublicKeySpec; import java.security.spec.InvalidKeySpecException; import java.security.spec.InvalidParameterSpecException; import java.security.spec.KeySpec; import org.eclipse.leshan.server.security.SecurityInfo; import org.eclipse.leshan.util.Hex; import com.google.gson.JsonDeserializationContext; import com.google.gson.JsonDeserializer; import com.google.gson.JsonElement; import com.google.gson.JsonObject; import com.google.gson.JsonParseException; import com.google.gson.JsonPrimitive; public class SecurityDeserializer implements JsonDeserializer<SecurityInfo> { @Override public SecurityInfo deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException { if (json == null) { return null; } SecurityInfo info = null; if (json.isJsonObject()) { JsonObject object = (JsonObject) json; String endpoint; if (object.has("endpoint")) { endpoint = object.get("endpoint").getAsString(); } else { throw new JsonParseException("Missing endpoint"); } JsonObject psk = (JsonObject) object.get("psk"); JsonObject rpk = (JsonObject) object.get("rpk"); JsonPrimitive x509 = object.getAsJsonPrimitive("x509"); if (psk != null) { // PSK Deserialization String identity; if (psk.has("identity")) { identity = psk.get("identity").getAsString(); } else { throw new JsonParseException("Missing PSK identity"); } byte[] key; try { key = Hex.decodeHex(psk.get("key").getAsString().toCharArray()); } catch (IllegalArgumentException e) { throw new JsonParseException("key parameter must be a valid hex string", e); } info = SecurityInfo.newPreSharedKeyInfo(endpoint, identity, key); } else if (rpk != null) { PublicKey key; try { byte[] x = Hex.decodeHex(rpk.get("x").getAsString().toCharArray()); byte[] y = Hex.decodeHex(rpk.get("y").getAsString().toCharArray()); String params = rpk.get("params").getAsString(); AlgorithmParameters algoParameters = AlgorithmParameters.getInstance("EC"); algoParameters.init(new ECGenParameterSpec(params)); ECParameterSpec parameterSpec = algoParameters.getParameterSpec(ECParameterSpec.class); KeySpec keySpec = new ECPublicKeySpec(new ECPoint(new BigInteger(x), new BigInteger(y)), parameterSpec); key = KeyFactory.getInstance("EC").generatePublic(keySpec); } catch (IllegalArgumentException | InvalidKeySpecException | NoSuchAlgorithmException | InvalidParameterSpecException e) { throw new JsonParseException("Invalid security info content", e); } info = SecurityInfo.newRawPublicKeyInfo(endpoint, key); } else if (x509 != null && x509.getAsBoolean()) { info = SecurityInfo.newX509CertInfo(endpoint); } else { throw new JsonParseException("Invalid security info content"); } } return info; } }