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annotate src/ch/ethz/ssh2/crypto/Base64.java @ 360:7eb24880b111
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| author | Carl Byington <carl@five-ten-sg.com> |
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| date | Mon, 04 Aug 2014 08:10:12 -0700 |
| parents | 071eccdff8ea |
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| rev | line source |
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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. |
| 307 | 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 */ |
| 307 | 16 public class Base64 { |
| 17 static final char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray(); | |
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18 |
| 307 | 19 public static char[] encode(byte[] content) { |
| 20 CharArrayWriter cw = new CharArrayWriter((4 * content.length) / 3); | |
| 21 int idx = 0; | |
| 22 int x = 0; | |
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23 |
| 307 | 24 for (int i = 0; i < content.length; i++) { |
| 25 if (idx == 0) | |
| 26 x = (content[i] & 0xff) << 16; | |
| 27 else if (idx == 1) | |
| 28 x = x | ((content[i] & 0xff) << 8); | |
| 29 else | |
| 30 x = x | (content[i] & 0xff); | |
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31 |
| 307 | 32 idx++; |
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33 |
| 307 | 34 if (idx == 3) { |
| 35 cw.write(alphabet[x >> 18]); | |
| 36 cw.write(alphabet[(x >> 12) & 0x3f]); | |
| 37 cw.write(alphabet[(x >> 6) & 0x3f]); | |
| 38 cw.write(alphabet[x & 0x3f]); | |
| 39 idx = 0; | |
| 40 } | |
| 41 } | |
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42 |
| 307 | 43 if (idx == 1) { |
| 44 cw.write(alphabet[x >> 18]); | |
| 45 cw.write(alphabet[(x >> 12) & 0x3f]); | |
| 46 cw.write('='); | |
| 47 cw.write('='); | |
| 48 } | |
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49 |
| 307 | 50 if (idx == 2) { |
| 51 cw.write(alphabet[x >> 18]); | |
| 52 cw.write(alphabet[(x >> 12) & 0x3f]); | |
| 53 cw.write(alphabet[(x >> 6) & 0x3f]); | |
| 54 cw.write('='); | |
| 55 } | |
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56 |
| 307 | 57 return cw.toCharArray(); |
| 58 } | |
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59 |
| 307 | 60 public static byte[] decode(char[] message) throws IOException { |
| 61 byte buff[] = new byte[4]; | |
| 62 byte dest[] = new byte[message.length]; | |
| 63 int bpos = 0; | |
| 64 int destpos = 0; | |
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65 |
| 307 | 66 for (int i = 0; i < message.length; i++) { |
| 67 int c = message[i]; | |
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68 |
| 307 | 69 if ((c == '\n') || (c == '\r') || (c == ' ') || (c == '\t')) |
| 70 continue; | |
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71 |
| 307 | 72 if ((c >= 'A') && (c <= 'Z')) { |
| 73 buff[bpos++] = (byte)(c - 'A'); | |
| 74 } | |
| 75 else if ((c >= 'a') && (c <= 'z')) { | |
| 76 buff[bpos++] = (byte)((c - 'a') + 26); | |
| 77 } | |
| 78 else if ((c >= '0') && (c <= '9')) { | |
| 79 buff[bpos++] = (byte)((c - '0') + 52); | |
| 80 } | |
| 81 else if (c == '+') { | |
| 82 buff[bpos++] = 62; | |
| 83 } | |
| 84 else if (c == '/') { | |
| 85 buff[bpos++] = 63; | |
| 86 } | |
| 87 else if (c == '=') { | |
| 88 buff[bpos++] = 64; | |
| 89 } | |
| 90 else { | |
| 91 throw new IOException("Illegal char in base64 code."); | |
| 92 } | |
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93 |
| 307 | 94 if (bpos == 4) { |
| 95 bpos = 0; | |
| 96 | |
| 97 if (buff[0] == 64) | |
| 98 break; | |
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99 |
| 307 | 100 if (buff[1] == 64) |
| 101 throw new IOException("Unexpected '=' in base64 code."); | |
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102 |
| 307 | 103 if (buff[2] == 64) { |
| 104 int v = (((buff[0] & 0x3f) << 6) | ((buff[1] & 0x3f))); | |
| 105 dest[destpos++] = (byte)(v >> 4); | |
| 106 break; | |
| 107 } | |
| 108 else if (buff[3] == 64) { | |
| 109 int v = (((buff[0] & 0x3f) << 12) | ((buff[1] & 0x3f) << 6) | ((buff[2] & 0x3f))); | |
| 110 dest[destpos++] = (byte)(v >> 10); | |
| 111 dest[destpos++] = (byte)(v >> 2); | |
| 112 break; | |
| 113 } | |
| 114 else { | |
| 115 int v = (((buff[0] & 0x3f) << 18) | ((buff[1] & 0x3f) << 12) | ((buff[2] & 0x3f) << 6) | ((buff[3] & 0x3f))); | |
| 116 dest[destpos++] = (byte)(v >> 16); | |
| 117 dest[destpos++] = (byte)(v >> 8); | |
| 118 dest[destpos++] = (byte)(v); | |
| 119 } | |
| 120 } | |
| 121 } | |
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122 |
| 307 | 123 byte[] res = new byte[destpos]; |
| 124 System.arraycopy(dest, 0, res, 0, destpos); | |
| 125 return res; | |
| 126 } | |
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127 } |