Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
B64 |
|
| 2.0;2 |
1 | /* | |
2 | * Licensed to the Apache Software Foundation (ASF) under one or more | |
3 | * contributor license agreements. See the NOTICE file distributed with | |
4 | * this work for additional information regarding copyright ownership. | |
5 | * The ASF licenses this file to You under the Apache License, Version 2.0 | |
6 | * (the "License"); you may not use this file except in compliance with | |
7 | * the License. You may obtain a copy of the License at | |
8 | * | |
9 | * http://www.apache.org/licenses/LICENSE-2.0 | |
10 | * | |
11 | * Unless required by applicable law or agreed to in writing, software | |
12 | * distributed under the License is distributed on an "AS IS" BASIS, | |
13 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
14 | * See the License for the specific language governing permissions and | |
15 | * limitations under the License. | |
16 | */ | |
17 | package org.apache.commons.codec.digest; | |
18 | ||
19 | import java.util.Random; | |
20 | ||
21 | /** | |
22 | * Base64 like method to convert binary bytes into ASCII chars. | |
23 | * | |
24 | * TODO: Can Base64 be reused? | |
25 | * | |
26 | * <p> | |
27 | * This class is immutable and thread-safe. | |
28 | * </p> | |
29 | * | |
30 | * @version $Id$ | |
31 | * @since 1.7 | |
32 | */ | |
33 | 1 | class B64 { |
34 | ||
35 | /** | |
36 | * Table with characters for Base64 transformation. | |
37 | */ | |
38 | static final String B64T = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; | |
39 | ||
40 | /** | |
41 | * Base64 like conversion of bytes to ASCII chars. | |
42 | * | |
43 | * @param b2 | |
44 | * A byte from the result. | |
45 | * @param b1 | |
46 | * A byte from the result. | |
47 | * @param b0 | |
48 | * A byte from the result. | |
49 | * @param outLen | |
50 | * The number of expected output chars. | |
51 | * @param buffer | |
52 | * Where the output chars is appended to. | |
53 | */ | |
54 | static void b64from24bit(final byte b2, final byte b1, final byte b0, final int outLen, | |
55 | final StringBuilder buffer) { | |
56 | // The bit masking is necessary because the JVM byte type is signed! | |
57 | 732 | int w = ((b2 << 16) & 0x00ffffff) | ((b1 << 8) & 0x00ffff) | (b0 & 0xff); |
58 | // It's effectively a "for" loop but kept to resemble the original C code. | |
59 | 732 | int n = outLen; |
60 | 3548 | while (n-- > 0) { |
61 | 2816 | buffer.append(B64T.charAt(w & 0x3f)); |
62 | 2816 | w >>= 6; |
63 | } | |
64 | 732 | } |
65 | ||
66 | /** | |
67 | * Generates a string of random chars from the B64T set. | |
68 | * | |
69 | * @param num | |
70 | * Number of chars to generate. | |
71 | */ | |
72 | static String getRandomSalt(final int num) { | |
73 | 18 | final StringBuilder saltString = new StringBuilder(); |
74 | 162 | for (int i = 1; i <= num; i++) { |
75 | 144 | saltString.append(B64T.charAt(new Random().nextInt(B64T.length()))); |
76 | } | |
77 | 18 | return saltString.toString(); |
78 | } | |
79 | } |