--- /dev/null
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP : APPC
+ * ================================================================================
+ * Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
+ * ================================================================================
+ * Copyright (C) 2017 Amdocs
+ * =============================================================================
+ * 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.
+ *
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.appc.encryption;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * HexHelper utility used for encryption/decryption
+ */
+public final class HexHelper {
+
+ @SuppressWarnings({
+ "javadoc", "nls"
+ })
+ public static final String CM_PATH = "@(#) [viewpath]/[item]";
+
+ @SuppressWarnings({
+ "nls", "javadoc"
+ })
+ public static final String CM_PROJECT = "@(#) [environment] [baseline]";
+
+ @SuppressWarnings({
+ "javadoc", "nls"
+ })
+ public static final String CM_VERSION = "@(#) [version] [crtime]";
+
+ private static final char[] HEX_TABLE = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
+ 'E', 'F'};
+
+ /**
+ * The logger for this class.
+ */
+ private static final Logger LOG = LoggerFactory.getLogger(HexHelper.class);
+
+ private static Map<Character, Integer> textToHex;
+
+ static {
+ textToHex = new HashMap<>();
+ textToHex.put('0', 0);
+ textToHex.put('1', 1);
+ textToHex.put('2', 2);
+ textToHex.put('3', 3);
+ textToHex.put('4', 4);
+ textToHex.put('5', 5);
+ textToHex.put('6', 6);
+ textToHex.put('7', 7);
+ textToHex.put('8', 8);
+ textToHex.put('9', 9);
+ textToHex.put('A', 10);
+ textToHex.put('B', 11);
+ textToHex.put('C', 12);
+ textToHex.put('D', 13);
+ textToHex.put('E', 14);
+ textToHex.put('F', 15);
+ }
+
+ /**
+ * Default private constructor prevents instantiation
+ */
+ private HexHelper() {
+ // no-op
+ }
+
+ /**
+ * Converts an array of bytes to the equivalent string representation using hexadecimal notation
+ *
+ * @param bytes The bytes to be converted to a hexadecimal string
+ * @return The string representation
+ */
+ public static String convertBytesToHex(byte[] bytes) throws EncryptionException{
+
+ if (bytes == null)
+ throw new EncryptionException("Given byte array is null");
+
+ StringBuilder builder = new StringBuilder(bytes.length * 2);
+ for (byte aByte : bytes) {
+ char tempChar;
+ // Get the first 4 bits (high) Do bitwise logical AND to get rid of
+ // low nibble. Shift results to right by 4 and get char
+ // representation
+ tempChar = HEX_TABLE[(aByte & 0xf0) >>> 4];
+ builder.append(tempChar);
+
+ // Get the last 4 bits (low) Do bitwise logical AND to get rid of
+ // high nibble. Get char representation
+ tempChar = HEX_TABLE[aByte & 0x0f];
+ builder.append(tempChar);
+ }
+ return builder.toString();
+ }
+
+ /**
+ * Converts a hexadecimal string representation of a binary value to an array of bytes
+ *
+ * @param hexValue The hex representation string to be converted
+ * @return The array of bytes that contains the binary value
+ */
+ @SuppressWarnings("nls")
+ public static byte[] convertHexToBytes(String hexValue) throws EncryptionException {
+
+ if (hexValue ==null)
+ throw new EncryptionException("Given hex value is null");
+
+ byte[] bytes;
+ byte high;
+ byte low;
+ char hexChar;
+
+ StringBuilder builder = new StringBuilder(hexValue.toUpperCase());
+ if (builder.length() % 2 != 0) {
+ LOG.warn("Invalid HEX value length. The length of the value has to be a multiple of 2."
+ + " Prepending '0' value.");
+ builder.insert(0, '0');
+ }
+ int hexLength = builder.length();
+ int byteLength = hexLength / 2;
+
+ bytes = new byte[byteLength];
+ try {
+ for (int index = 0; index < hexLength; index += 2) {
+ hexChar = builder.charAt(index);
+ high = textToHex.get(hexChar).byteValue();
+ high = (byte) (high << 4);
+ hexChar = builder.charAt(index + 1);
+ low = textToHex.get(hexChar).byteValue();
+ high = (byte) (high | low);
+ bytes[index / 2] = high;
+ }
+ }
+ catch (NullPointerException e){
+ LOG.error("Given string contains not hexadecimal values", e);
+ throw new EncryptionException("Given string contains not hexadecimal values");
+ }
+
+ return bytes;
+ }
+}
Code Review / appc.git / blobdiff