init code

[vfc/nfvo/wfengine.git] / wso2 / common-util / src / main / java / org / openo / baseservice / encrypt / cbb / sha / Sha256.java

diff --git a/wso2/common-util/src/main/java/org/openo/baseservice/encrypt/cbb/sha/Sha256.java b/wso2/common-util/src/main/java/org/openo/baseservice/encrypt/cbb/sha/Sha256.java
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+++ b/wso2/common-util/src/main/java/org/openo/baseservice/encrypt/cbb/sha/Sha256.java
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+/*
+ * Copyright 2016 Huawei Technologies Co., Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.openo.baseservice.encrypt.cbb.sha;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.nio.charset.StandardCharsets;
+import java.security.InvalidKeyException;
+import java.security.Key;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+import javax.crypto.Mac;
+import javax.crypto.spec.SecretKeySpec;
+import javax.xml.bind.DatatypeConverter;
+
+/**
+ * Utility to generate SHA256 digest and HMAC.<br/>
+ * <p>
+ * </p>
+ * 
+ * @author
+ * @version   03-Jun-2016
+ */
+public final class Sha256 {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(Sha256.class);
+
+    private Sha256() {
+
+    }
+
+    /**
+     * Generates SHA256 digest.<br/>
+     * 
+     * @param data: The data to be digested.
+     * @return Hex encoded digested data.
+     * @since  
+     */
+    public static String digest(final String data) {
+        final byte[] dataBytes = data.getBytes(StandardCharsets.UTF_8);
+        MessageDigest md = null;
+        try {
+            md = MessageDigest.getInstance("SHA-256");
+        } catch(final NoSuchAlgorithmException e) {
+            LOGGER.error("No SHA-256 support ", e);
+            return "";
+        }
+        final byte[] digest = md.digest(dataBytes);
+        return DatatypeConverter.printHexBinary(digest);
+    }
+
+    /**
+     * Generates hmac signature using data and key.<br/>
+     * 
+     * @param data: The data to be signed.
+     * @param key: The signing key.
+     * @return Hex encoded HMAC signature.
+     * @throws InvalidKeyException if the key is invalid.
+     * @since  
+     */
+    public static String mac(final String data, final Key key) throws InvalidKeyException {
+        final byte[] dataBytes = data.getBytes(StandardCharsets.UTF_8);
+        Mac mac = null;
+        try {
+            mac = Mac.getInstance("HmacSHA256");
+            mac.init(key);
+        } catch(final NoSuchAlgorithmException e) {
+            LOGGER.error("SHA mac not supported", e);
+            return "";
+        }
+        final byte[] digest = mac.doFinal(dataBytes);
+        return DatatypeConverter.printHexBinary(digest);
+
+    }
+
+    /**
+     * Generates hmac with data and secret.
+     * <br/>
+     * 
+     * @param data: The data to be signed.
+     * @param secret: The signing key.
+     * @return Hex encoded HMAC signature.
+     * @since  
+     */
+    public static String mac(final String data, final byte[] secret) {
+        final Key key = new SecretKeySpec(secret, "HmacSHA256");
+        try {
+            return mac(data, key);
+        } catch(final InvalidKeyException e) {
+            LOGGER.error("Invalid key: ", e);
+            return "";
+        }
+    }
+
+}