annotate src/ch/ethz/ssh2/crypto/Base64.java @ 389:f715ad45ce01

Added tag stable-1.9.0 for changeset ebcb4aea03ec
author Carl Byington <carl@five-ten-sg.com>
date Tue, 19 Aug 2014 15:48:40 -0700
parents 071eccdff8ea
children
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1 /*
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2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved.
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3 * Please refer to the LICENSE.txt for licensing details.
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4 */
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5 package ch.ethz.ssh2.crypto;
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6
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7 import java.io.CharArrayWriter;
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8 import java.io.IOException;
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9
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10 /**
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11 * Basic Base64 Support.
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12 *
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13 * @author Christian Plattner
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14 * @version 2.50, 03/15/10
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15 */
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16 public class Base64 {
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17 static final char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
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18
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19 public static char[] encode(byte[] content) {
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20 CharArrayWriter cw = new CharArrayWriter((4 * content.length) / 3);
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21 int idx = 0;
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22 int x = 0;
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23
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24 for (int i = 0; i < content.length; i++) {
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25 if (idx == 0)
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26 x = (content[i] & 0xff) << 16;
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27 else if (idx == 1)
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28 x = x | ((content[i] & 0xff) << 8);
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29 else
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30 x = x | (content[i] & 0xff);
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31
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32 idx++;
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33
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34 if (idx == 3) {
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35 cw.write(alphabet[x >> 18]);
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36 cw.write(alphabet[(x >> 12) & 0x3f]);
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37 cw.write(alphabet[(x >> 6) & 0x3f]);
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38 cw.write(alphabet[x & 0x3f]);
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39 idx = 0;
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40 }
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41 }
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42
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43 if (idx == 1) {
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44 cw.write(alphabet[x >> 18]);
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45 cw.write(alphabet[(x >> 12) & 0x3f]);
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46 cw.write('=');
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47 cw.write('=');
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48 }
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49
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50 if (idx == 2) {
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51 cw.write(alphabet[x >> 18]);
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52 cw.write(alphabet[(x >> 12) & 0x3f]);
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53 cw.write(alphabet[(x >> 6) & 0x3f]);
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54 cw.write('=');
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55 }
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56
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57 return cw.toCharArray();
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58 }
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59
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60 public static byte[] decode(char[] message) throws IOException {
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61 byte buff[] = new byte[4];
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62 byte dest[] = new byte[message.length];
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63 int bpos = 0;
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64 int destpos = 0;
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65
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66 for (int i = 0; i < message.length; i++) {
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67 int c = message[i];
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68
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69 if ((c == '\n') || (c == '\r') || (c == ' ') || (c == '\t'))
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70 continue;
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71
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72 if ((c >= 'A') && (c <= 'Z')) {
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73 buff[bpos++] = (byte)(c - 'A');
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74 }
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75 else if ((c >= 'a') && (c <= 'z')) {
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76 buff[bpos++] = (byte)((c - 'a') + 26);
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77 }
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78 else if ((c >= '0') && (c <= '9')) {
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79 buff[bpos++] = (byte)((c - '0') + 52);
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80 }
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81 else if (c == '+') {
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82 buff[bpos++] = 62;
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83 }
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84 else if (c == '/') {
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85 buff[bpos++] = 63;
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86 }
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87 else if (c == '=') {
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88 buff[bpos++] = 64;
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89 }
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90 else {
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91 throw new IOException("Illegal char in base64 code.");
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92 }
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93
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94 if (bpos == 4) {
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95 bpos = 0;
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96
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97 if (buff[0] == 64)
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98 break;
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99
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100 if (buff[1] == 64)
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101 throw new IOException("Unexpected '=' in base64 code.");
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102
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103 if (buff[2] == 64) {
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104 int v = (((buff[0] & 0x3f) << 6) | ((buff[1] & 0x3f)));
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105 dest[destpos++] = (byte)(v >> 4);
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106 break;
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107 }
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108 else if (buff[3] == 64) {
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109 int v = (((buff[0] & 0x3f) << 12) | ((buff[1] & 0x3f) << 6) | ((buff[2] & 0x3f)));
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110 dest[destpos++] = (byte)(v >> 10);
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111 dest[destpos++] = (byte)(v >> 2);
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112 break;
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113 }
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114 else {
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115 int v = (((buff[0] & 0x3f) << 18) | ((buff[1] & 0x3f) << 12) | ((buff[2] & 0x3f) << 6) | ((buff[3] & 0x3f)));
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116 dest[destpos++] = (byte)(v >> 16);
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117 dest[destpos++] = (byte)(v >> 8);
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118 dest[destpos++] = (byte)(v);
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119 }
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120 }
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121 }
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122
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123 byte[] res = new byte[destpos];
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124 System.arraycopy(dest, 0, res, 0, destpos);
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125 return res;
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126 }
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127 }