Mercurial > 510Connectbot
annotate app/src/main/java/ch/ethz/ssh2/crypto/Base64.java @ 517:e70ec2c51ffa
Added tag stable-1.9.4-7 for changeset 3407f4741240
author | Carl Byington <carl@five-ten-sg.com> |
---|---|
date | Fri, 31 May 2024 13:31:52 -0600 |
parents | d29cce60f393 |
children |
rev | line source |
---|---|
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
1 /* |
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
2 * Copyright (c) 2006-2011 Christian Plattner. All rights reserved. |
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
3 * Please refer to the LICENSE.txt for licensing details. |
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
4 */ |
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
5 package ch.ethz.ssh2.crypto; |
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
6 |
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
7 import java.io.CharArrayWriter; |
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
8 import java.io.IOException; |
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
9 |
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
10 /** |
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
11 * Basic Base64 Support. |
307 | 12 * |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
13 * @author Christian Plattner |
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
14 * @version 2.50, 03/15/10 |
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
15 */ |
307 | 16 public class Base64 { |
17 static final char[] alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".toCharArray(); | |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
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; | |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
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); | |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
31 |
307 | 32 idx++; |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
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 } | |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
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 } | |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
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 } | |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
56 |
307 | 57 return cw.toCharArray(); |
58 } | |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
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; | |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
65 |
307 | 66 for (int i = 0; i < message.length; i++) { |
67 int c = message[i]; | |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
68 |
307 | 69 if ((c == '\n') || (c == '\r') || (c == ' ') || (c == '\t')) |
70 continue; | |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
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 } | |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
93 |
307 | 94 if (bpos == 4) { |
95 bpos = 0; | |
96 | |
97 if (buff[0] == 64) | |
98 break; | |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
99 |
307 | 100 if (buff[1] == 64) |
101 throw new IOException("Unexpected '=' in base64 code."); | |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
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 } | |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
122 |
307 | 123 byte[] res = new byte[destpos]; |
124 System.arraycopy(dest, 0, res, 0, destpos); | |
125 return res; | |
126 } | |
273
91a31873c42a
start conversion from trilead to ganymed
Carl Byington <carl@five-ten-sg.com>
parents:
diff
changeset
|
127 } |