1 package org.bouncycastle.util.encoders; 2 3 import java.io.ByteArrayOutputStream; 4 import java.io.IOException; 5 import java.io.OutputStream; 6 7 import org.bouncycastle.util.Strings; 8 9 /** 10 * Utility class for converting hex data to bytes and back again. 11 */ 12 public class Hex 13 { 14 private static final Encoder encoder = new HexEncoder(); 15 toHexString( byte[] data)16 public static String toHexString( 17 byte[] data) 18 { 19 return toHexString(data, 0, data.length); 20 } 21 toHexString( byte[] data, int off, int length)22 public static String toHexString( 23 byte[] data, 24 int off, 25 int length) 26 { 27 byte[] encoded = encode(data, off, length); 28 return Strings.fromByteArray(encoded); 29 } 30 31 /** 32 * encode the input data producing a Hex encoded byte array. 33 * 34 * @return a byte array containing the Hex encoded data. 35 */ encode( byte[] data)36 public static byte[] encode( 37 byte[] data) 38 { 39 return encode(data, 0, data.length); 40 } 41 42 /** 43 * encode the input data producing a Hex encoded byte array. 44 * 45 * @return a byte array containing the Hex encoded data. 46 */ encode( byte[] data, int off, int length)47 public static byte[] encode( 48 byte[] data, 49 int off, 50 int length) 51 { 52 ByteArrayOutputStream bOut = new ByteArrayOutputStream(); 53 54 try 55 { 56 encoder.encode(data, off, length, bOut); 57 } 58 catch (Exception e) 59 { 60 throw new EncoderException("exception encoding Hex string: " + e.getMessage(), e); 61 } 62 63 return bOut.toByteArray(); 64 } 65 66 /** 67 * Hex encode the byte data writing it to the given output stream. 68 * 69 * @return the number of bytes produced. 70 */ encode( byte[] data, OutputStream out)71 public static int encode( 72 byte[] data, 73 OutputStream out) 74 throws IOException 75 { 76 return encoder.encode(data, 0, data.length, out); 77 } 78 79 /** 80 * Hex encode the byte data writing it to the given output stream. 81 * 82 * @return the number of bytes produced. 83 */ encode( byte[] data, int off, int length, OutputStream out)84 public static int encode( 85 byte[] data, 86 int off, 87 int length, 88 OutputStream out) 89 throws IOException 90 { 91 return encoder.encode(data, off, length, out); 92 } 93 94 /** 95 * decode the Hex encoded input data. It is assumed the input data is valid. 96 * 97 * @return a byte array representing the decoded data. 98 */ decode( byte[] data)99 public static byte[] decode( 100 byte[] data) 101 { 102 ByteArrayOutputStream bOut = new ByteArrayOutputStream(); 103 104 try 105 { 106 encoder.decode(data, 0, data.length, bOut); 107 } 108 catch (Exception e) 109 { 110 throw new DecoderException("exception decoding Hex data: " + e.getMessage(), e); 111 } 112 113 return bOut.toByteArray(); 114 } 115 116 /** 117 * decode the Hex encoded String data - whitespace will be ignored. 118 * 119 * @return a byte array representing the decoded data. 120 */ decode( String data)121 public static byte[] decode( 122 String data) 123 { 124 ByteArrayOutputStream bOut = new ByteArrayOutputStream(); 125 126 try 127 { 128 encoder.decode(data, bOut); 129 } 130 catch (Exception e) 131 { 132 throw new DecoderException("exception decoding Hex string: " + e.getMessage(), e); 133 } 134 135 return bOut.toByteArray(); 136 } 137 138 /** 139 * decode the Hex encoded String data writing it to the given output stream, 140 * whitespace characters will be ignored. 141 * 142 * @return the number of bytes produced. 143 */ decode( String data, OutputStream out)144 public static int decode( 145 String data, 146 OutputStream out) 147 throws IOException 148 { 149 return encoder.decode(data, out); 150 } 151 } 152