1 /* 2 * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /** 25 * Utility class containing conversions between strings, arrays, and numeric 26 * values. 27 */ 28 29 import java.math.BigInteger; 30 31 public class Convert { 32 33 public static String byteArrayToHexString(byte[] arr) { 34 StringBuilder result = new StringBuilder(); 35 for (int i = 0; i < arr.length; ++i) { 36 byte curVal = arr[i]; 37 result.append(Character.forDigit(curVal >> 4 & 0xF, 16)); 38 result.append(Character.forDigit(curVal & 0xF, 16)); 39 } 40 return result.toString(); 41 } 42 43 public static byte[] byteToByteArray(byte v, int length) { 44 byte[] result = new byte[length]; 45 result[0] = v; 46 return result; 47 } 48 49 public static byte[] hexStringToByteArray(String str) { 50 byte[] result = new byte[str.length() / 2]; 51 for (int i = 0; i < result.length; i++) { 52 result[i] = (byte) Character.digit(str.charAt(2 * i), 16); 53 result[i] <<= 4; 54 result[i] += Character.digit(str.charAt(2 * i + 1), 16); 55 } 56 return result; 57 } 58 59 public static 60 BigInteger hexStringToBigInteger(boolean clearHighBit, String str) { 61 BigInteger result = BigInteger.ZERO; 62 for (int i = 0; i < str.length() / 2; i++) { 63 int curVal = Character.digit(str.charAt(2 * i), 16); 64 curVal <<= 4; 65 curVal += Character.digit(str.charAt(2 * i + 1), 16); 66 if (clearHighBit && i == str.length() / 2 - 1) { 67 curVal &= 0x7F; 68 } 69 result = result.add(BigInteger.valueOf(curVal).shiftLeft(8 * i)); 70 } 71 return result; 72 } 73 } 74 75