+++ /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