author | jnimeh |
Wed, 07 Jan 2015 09:32:41 -0800 | |
changeset 28301 | 6a8523efd309 |
parent 25859 | 3317bb8137f4 |
child 32275 | 17eeb583a331 |
permissions | -rw-r--r-- |
2 | 1 |
/* |
28301
6a8523efd309
8058912: Broken link (access denied error) to http://www.rsasecurity.com in RC5ParameterSpec
jnimeh
parents:
25859
diff
changeset
|
2 |
* Copyright (c) 1998, 2015, Oracle and/or its affiliates. All rights reserved. |
2 | 3 |
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 |
* |
|
5 |
* This code is free software; you can redistribute it and/or modify it |
|
6 |
* under the terms of the GNU General Public License version 2 only, as |
|
5506 | 7 |
* published by the Free Software Foundation. Oracle designates this |
2 | 8 |
* particular file as subject to the "Classpath" exception as provided |
5506 | 9 |
* by Oracle in the LICENSE file that accompanied this code. |
2 | 10 |
* |
11 |
* This code is distributed in the hope that it will be useful, but WITHOUT |
|
12 |
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
|
13 |
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
|
14 |
* version 2 for more details (a copy is included in the LICENSE file that |
|
15 |
* accompanied this code). |
|
16 |
* |
|
17 |
* You should have received a copy of the GNU General Public License version |
|
18 |
* 2 along with this work; if not, write to the Free Software Foundation, |
|
19 |
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
|
20 |
* |
|
5506 | 21 |
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
22 |
* or visit www.oracle.com if you need additional information or have any |
|
23 |
* questions. |
|
2 | 24 |
*/ |
25 |
||
26 |
package javax.crypto.spec; |
|
27 |
||
28 |
import java.security.spec.AlgorithmParameterSpec; |
|
29 |
||
30 |
/** |
|
31 |
* This class specifies the parameters used with the |
|
28301
6a8523efd309
8058912: Broken link (access denied error) to http://www.rsasecurity.com in RC5ParameterSpec
jnimeh
parents:
25859
diff
changeset
|
32 |
* <a href="http://tools.ietf.org/html/rfc2040"><i>RC5</i></a> |
2 | 33 |
* algorithm. |
34 |
* |
|
35 |
* <p> The parameters consist of a version number, a rounds count, a word |
|
36 |
* size, and optionally an initialization vector (IV) (only in feedback mode). |
|
37 |
* |
|
38 |
* <p> This class can be used to initialize a <code>Cipher</code> object that |
|
39 |
* implements the <i>RC5</i> algorithm as supplied by |
|
28301
6a8523efd309
8058912: Broken link (access denied error) to http://www.rsasecurity.com in RC5ParameterSpec
jnimeh
parents:
25859
diff
changeset
|
40 |
* <a href="http://www.rsa.com">RSA Security LLC</a>, |
2 | 41 |
* or any parties authorized by RSA Security. |
42 |
* |
|
43 |
* @author Jan Luehe |
|
44 |
* |
|
45 |
* @since 1.4 |
|
46 |
*/ |
|
47 |
public class RC5ParameterSpec implements AlgorithmParameterSpec { |
|
48 |
||
49 |
private byte[] iv = null; |
|
50 |
private int version; |
|
51 |
private int rounds; |
|
52 |
private int wordSize; // the word size in bits |
|
53 |
||
54 |
/** |
|
55 |
* Constructs a parameter set for RC5 from the given version, number of |
|
56 |
* rounds and word size (in bits). |
|
57 |
* |
|
58 |
* @param version the version. |
|
59 |
* @param rounds the number of rounds. |
|
60 |
* @param wordSize the word size in bits. |
|
61 |
*/ |
|
62 |
public RC5ParameterSpec(int version, int rounds, int wordSize) { |
|
63 |
this.version = version; |
|
64 |
this.rounds = rounds; |
|
65 |
this.wordSize = wordSize; |
|
66 |
} |
|
67 |
||
68 |
/** |
|
69 |
* Constructs a parameter set for RC5 from the given version, number of |
|
70 |
* rounds, word size (in bits), and IV. |
|
71 |
* |
|
72 |
* <p> Note that the size of the IV (block size) must be twice the word |
|
73 |
* size. The bytes that constitute the IV are those between |
|
74 |
* <code>iv[0]</code> and <code>iv[2*(wordSize/8)-1]</code> inclusive. |
|
75 |
* |
|
76 |
* @param version the version. |
|
77 |
* @param rounds the number of rounds. |
|
78 |
* @param wordSize the word size in bits. |
|
79 |
* @param iv the buffer with the IV. The first <code>2*(wordSize/8) |
|
80 |
* </code> bytes of the buffer are copied to protect against subsequent |
|
81 |
* modification. |
|
82 |
* @exception IllegalArgumentException if <code>iv</code> is |
|
18156 | 83 |
* <code>null</code> or {@code (iv.length < 2 * (wordSize / 8))} |
2 | 84 |
*/ |
85 |
public RC5ParameterSpec(int version, int rounds, int wordSize, byte[] iv) { |
|
86 |
this(version, rounds, wordSize, iv, 0); |
|
87 |
} |
|
88 |
||
89 |
/** |
|
90 |
* Constructs a parameter set for RC5 from the given version, number of |
|
91 |
* rounds, word size (in bits), and IV. |
|
92 |
* |
|
93 |
* <p> The IV is taken from <code>iv</code>, starting at |
|
94 |
* <code>offset</code> inclusive. |
|
95 |
* Note that the size of the IV (block size), starting at |
|
96 |
* <code>offset</code> inclusive, must be twice the word size. |
|
97 |
* The bytes that constitute the IV are those between |
|
98 |
* <code>iv[offset]</code> and <code>iv[offset+2*(wordSize/8)-1]</code> |
|
99 |
* inclusive. |
|
100 |
* |
|
101 |
* @param version the version. |
|
102 |
* @param rounds the number of rounds. |
|
103 |
* @param wordSize the word size in bits. |
|
104 |
* @param iv the buffer with the IV. The first <code>2*(wordSize/8) |
|
105 |
* </code> bytes of the buffer beginning at <code>offset</code> |
|
106 |
* inclusive are copied to protect against subsequent modification. |
|
107 |
* @param offset the offset in <code>iv</code> where the IV starts. |
|
108 |
* @exception IllegalArgumentException if <code>iv</code> is |
|
109 |
* <code>null</code> or |
|
18156 | 110 |
* {@code (iv.length - offset < 2 * (wordSize / 8))} |
2 | 111 |
*/ |
112 |
public RC5ParameterSpec(int version, int rounds, int wordSize, |
|
113 |
byte[] iv, int offset) { |
|
114 |
this.version = version; |
|
115 |
this.rounds = rounds; |
|
116 |
this.wordSize = wordSize; |
|
117 |
if (iv == null) throw new IllegalArgumentException("IV missing"); |
|
118 |
int blockSize = (wordSize / 8) * 2; |
|
119 |
if (iv.length - offset < blockSize) { |
|
120 |
throw new IllegalArgumentException("IV too short"); |
|
121 |
} |
|
122 |
this.iv = new byte[blockSize]; |
|
123 |
System.arraycopy(iv, offset, this.iv, 0, blockSize); |
|
124 |
} |
|
125 |
||
126 |
/** |
|
127 |
* Returns the version. |
|
128 |
* |
|
129 |
* @return the version. |
|
130 |
*/ |
|
131 |
public int getVersion() { |
|
132 |
return this.version; |
|
133 |
} |
|
134 |
||
135 |
/** |
|
136 |
* Returns the number of rounds. |
|
137 |
* |
|
138 |
* @return the number of rounds. |
|
139 |
*/ |
|
140 |
public int getRounds() { |
|
141 |
return this.rounds; |
|
142 |
} |
|
143 |
||
144 |
/** |
|
145 |
* Returns the word size in bits. |
|
146 |
* |
|
147 |
* @return the word size in bits. |
|
148 |
*/ |
|
149 |
public int getWordSize() { |
|
150 |
return this.wordSize; |
|
151 |
} |
|
152 |
||
153 |
/** |
|
154 |
* Returns the IV or null if this parameter set does not contain an IV. |
|
155 |
* |
|
156 |
* @return the IV or null if this parameter set does not contain an IV. |
|
157 |
* Returns a new array each time this method is called. |
|
158 |
*/ |
|
159 |
public byte[] getIV() { |
|
10336
0bb1999251f8
7064075: Security libraries don't build with javac -Xlint:all,-deprecation -Werror
jjg
parents:
5506
diff
changeset
|
160 |
return (iv == null? null:iv.clone()); |
2 | 161 |
} |
162 |
||
163 |
/** |
|
164 |
* Tests for equality between the specified object and this |
|
165 |
* object. Two RC5ParameterSpec objects are considered equal if their |
|
166 |
* version numbers, number of rounds, word sizes, and IVs are equal. |
|
167 |
* (Two IV references are considered equal if both are <tt>null</tt>.) |
|
168 |
* |
|
169 |
* @param obj the object to test for equality with this object. |
|
170 |
* |
|
171 |
* @return true if the objects are considered equal, false if |
|
172 |
* <code>obj</code> is null or otherwise. |
|
173 |
*/ |
|
174 |
public boolean equals(Object obj) { |
|
175 |
if (obj == this) { |
|
176 |
return true; |
|
177 |
} |
|
178 |
if (!(obj instanceof RC5ParameterSpec)) { |
|
179 |
return false; |
|
180 |
} |
|
181 |
RC5ParameterSpec other = (RC5ParameterSpec) obj; |
|
182 |
||
183 |
return ((version == other.version) && |
|
184 |
(rounds == other.rounds) && |
|
185 |
(wordSize == other.wordSize) && |
|
186 |
java.util.Arrays.equals(iv, other.iv)); |
|
187 |
} |
|
188 |
||
189 |
/** |
|
190 |
* Calculates a hash code value for the object. |
|
191 |
* Objects that are equal will also have the same hashcode. |
|
192 |
*/ |
|
193 |
public int hashCode() { |
|
194 |
int retval = 0; |
|
195 |
if (iv != null) { |
|
196 |
for (int i = 1; i < iv.length; i++) { |
|
197 |
retval += iv[i] * i; |
|
198 |
} |
|
199 |
} |
|
200 |
retval += (version + rounds + wordSize); |
|
201 |
return retval; |
|
202 |
} |
|
203 |
} |