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annotate src/ch/ethz/ssh2/crypto/Base64.java @ 273:91a31873c42a ganymed

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start conversion from trilead to ganymed
author Carl Byington <carl@five-ten-sg.com>
date Fri, 18 Jul 2014 11:21:46 -0700
parents
children 071eccdff8ea
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
273
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
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1 /*
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Carl Byington <carl@five-ten-sg.com>
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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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Carl Byington <carl@five-ten-sg.com>
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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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Carl Byington <carl@five-ten-sg.com>
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10 /**
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Carl Byington <carl@five-ten-sg.com>
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11 * Basic Base64 Support.
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Carl Byington <carl@five-ten-sg.com>
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12 *
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Carl Byington <carl@five-ten-sg.com>
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13 * @author Christian Plattner
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Carl Byington <carl@five-ten-sg.com>
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14 * @version 2.50, 03/15/10
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Carl Byington <carl@five-ten-sg.com>
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15 */
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Carl Byington <carl@five-ten-sg.com>
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16 public class Base64
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17 {
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18 static final char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray();
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19
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20 public static char[] encode(byte[] content)
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21 {
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22 CharArrayWriter cw = new CharArrayWriter((4 * content.length) / 3);
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23
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24 int idx = 0;
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25
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26 int x = 0;
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27
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28 for (int i = 0; i < content.length; i++)
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29 {
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30 if (idx == 0)
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31 x = (content[i] & 0xff) << 16;
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32 else if (idx == 1)
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33 x = x | ((content[i] & 0xff) << 8);
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34 else
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35 x = x | (content[i] & 0xff);
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36
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37 idx++;
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38
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39 if (idx == 3)
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Carl Byington <carl@five-ten-sg.com>
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40 {
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41 cw.write(alphabet[x >> 18]);
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42 cw.write(alphabet[(x >> 12) & 0x3f]);
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43 cw.write(alphabet[(x >> 6) & 0x3f]);
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44 cw.write(alphabet[x & 0x3f]);
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45
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46 idx = 0;
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47 }
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48 }
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49
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
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50 if (idx == 1)
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
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51 {
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52 cw.write(alphabet[x >> 18]);
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53 cw.write(alphabet[(x >> 12) & 0x3f]);
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54 cw.write('=');
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55 cw.write('=');
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56 }
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57
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58 if (idx == 2)
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Carl Byington <carl@five-ten-sg.com>
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59 {
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60 cw.write(alphabet[x >> 18]);
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61 cw.write(alphabet[(x >> 12) & 0x3f]);
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62 cw.write(alphabet[(x >> 6) & 0x3f]);
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63 cw.write('=');
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64 }
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65
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66 return cw.toCharArray();
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Carl Byington <carl@five-ten-sg.com>
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67 }
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68
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69 public static byte[] decode(char[] message) throws IOException
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70 {
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71 byte buff[] = new byte[4];
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72 byte dest[] = new byte[message.length];
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73
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74 int bpos = 0;
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75 int destpos = 0;
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76
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77 for (int i = 0; i < message.length; i++)
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78 {
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79 int c = message[i];
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80
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81 if ((c == '\n') || (c == '\r') || (c == ' ') || (c == '\t'))
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82 continue;
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Carl Byington <carl@five-ten-sg.com>
parents:
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83
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Carl Byington <carl@five-ten-sg.com>
parents:
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84 if ((c >= 'A') && (c <= 'Z'))
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Carl Byington <carl@five-ten-sg.com>
parents:
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85 {
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Carl Byington <carl@five-ten-sg.com>
parents:
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86 buff[bpos++] = (byte) (c - 'A');
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Carl Byington <carl@five-ten-sg.com>
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87 }
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Carl Byington <carl@five-ten-sg.com>
parents:
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88 else if ((c >= 'a') && (c <= 'z'))
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Carl Byington <carl@five-ten-sg.com>
parents:
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89 {
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90 buff[bpos++] = (byte) ((c - 'a') + 26);
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Carl Byington <carl@five-ten-sg.com>
parents:
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91 }
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Carl Byington <carl@five-ten-sg.com>
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92 else if ((c >= '0') && (c <= '9'))
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Carl Byington <carl@five-ten-sg.com>
parents:
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93 {
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parents:
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94 buff[bpos++] = (byte) ((c - '0') + 52);
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95 }
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Carl Byington <carl@five-ten-sg.com>
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96 else if (c == '+')
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Carl Byington <carl@five-ten-sg.com>
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97 {
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Carl Byington <carl@five-ten-sg.com>
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98 buff[bpos++] = 62;
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99 }
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100 else if (c == '/')
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Carl Byington <carl@five-ten-sg.com>
parents:
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101 {
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102 buff[bpos++] = 63;
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103 }
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Carl Byington <carl@five-ten-sg.com>
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104 else if (c == '=')
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Carl Byington <carl@five-ten-sg.com>
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105 {
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106 buff[bpos++] = 64;
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107 }
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108 else
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109 {
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110 throw new IOException("Illegal char in base64 code.");
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111 }
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112
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Carl Byington <carl@five-ten-sg.com>
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113 if (bpos == 4)
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Carl Byington <carl@five-ten-sg.com>
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114 {
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115 bpos = 0;
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116
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117 if (buff[0] == 64)
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118 break;
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119
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120 if (buff[1] == 64)
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121 throw new IOException("Unexpected '=' in base64 code.");
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122
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123 if (buff[2] == 64)
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124 {
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125 int v = (((buff[0] & 0x3f) << 6) | ((buff[1] & 0x3f)));
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126 dest[destpos++] = (byte) (v >> 4);
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127 break;
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128 }
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129 else if (buff[3] == 64)
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130 {
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131 int v = (((buff[0] & 0x3f) << 12) | ((buff[1] & 0x3f) << 6) | ((buff[2] & 0x3f)));
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132 dest[destpos++] = (byte) (v >> 10);
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133 dest[destpos++] = (byte) (v >> 2);
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134 break;
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parents:
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135 }
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136 else
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137 {
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parents:
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138 int v = (((buff[0] & 0x3f) << 18) | ((buff[1] & 0x3f) << 12) | ((buff[2] & 0x3f) << 6) | ((buff[3] & 0x3f)));
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parents:
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139 dest[destpos++] = (byte) (v >> 16);
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140 dest[destpos++] = (byte) (v >> 8);
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parents:
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141 dest[destpos++] = (byte) (v);
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Carl Byington <carl@five-ten-sg.com>
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142 }
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Carl Byington <carl@five-ten-sg.com>
parents:
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143 }
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Carl Byington <carl@five-ten-sg.com>
parents:
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144 }
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parents:
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145
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parents:
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146 byte[] res = new byte[destpos];
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parents:
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147 System.arraycopy(dest, 0, res, 0, destpos);
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parents:
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148
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parents:
diff changeset
149 return res;
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
150 }
91a31873c42a start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff changeset
151 }