Thursday, 14 December 2017
BlockFrequencyTest.java (Block Frequency random number test Java source code file) Print E-mail
Get C++ DiceLock cipher architecture source code packages of DiceLock for Microsoft Visual Studio 2013 and DiceLock-x for Linux with Test Driver Programs and Response Test Vector files to verify that both them work as expected.
DiceLock for Windows and Linux
DiceLock Security governing software licenses are Free/Libre Source Code License and Educational and Research License

DiceLock is protected by US patent 7508945 and European Patent 1182777 where applicable.

DiceLock and DiceLock logo are trademarks or registered trademarks in the EC, USA and others.

License information can be obtained at our corporate web site




1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
 
//
// Creator:    http://www.dicelocksecurity.com
// Version:    vers.6.0.0.1
//
// Copyright (C) 2011-2012 DiceLock Security, LLC. All rights reserved.
//
//                               DISCLAIMER
//
// THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
// REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
// OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
// WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
// OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// DICELOCK IS A REGISTERED TRADEMARK OR TRADEMARK OF THE OWNERS.
//
// Environment:
// java version "1.6.0_29"
// Java(TM) SE Runtime Environment (build 1.6.0_29-b11)
// Java HotSpot(TM) Server VM (build 20.4-b02, mixed mode)
//
 
package com.dicelocksecurity.jdicelock.RandomTest;
 
import com.dicelocksecurity.jdicelock.CryptoRandomStream.BaseCryptoRandomStream;
 
/**
 * Class implementing Block Frequency random number test
 *
 * @author      Angel Ferré @ DiceLock Security
 * @version     6.0.0.1
 * @since       2011-09-30
 */
public class BlockFrequencyTest extends BaseRandomTest {
 
    /**
     * Random Test Class enumerator name
     */
    protected static final RandomTests TEST = RandomTests.BlockFrequency;
 
    /**
     * Random Test Class minimum stream length
     */
    protected static final int MINIMUMLENGTH = 100;
 
    /**
     * "blockLength" length in bits of block division
     */
    protected int blockLength;
 
    /**
     * "chiSquared" result
     */
    protected double chiSquared;
 
    /**
     * "blockNumber", number of blocks of the stream
     */
    protected int blockNumber;
 
    /**
     * "bitsDiscarded", bits discarded from the test, number of bits excluded from the test
     */
    protected int bitsDiscarded;
 
    /**
     * Constructor, default
     */
    public BlockFrequencyTest() {
 
        super();
 
        this.blockLength = 128;
        this.alpha = 0.0;
        this.pValue = 0.0;
        this.random = false;
        this.error = RandomTestErrors.NoError;
    }
 
    /**
     * Constructor with a MathematicalFunctions object instantiated
     *
     * @param     mathFuncObj   mathematicalFunctions object that will be used by this object
     */
    public BlockFrequencyTest(MathematicalFunctions mathFuncObj) {
 
        super(mathFuncObj);
        super.Initialize();
 
        this.blockLength = 128;
        this.chiSquared = 0.0;
        this.blockNumber = 0;
        this.bitsDiscarded = 0;
    }
 
    /**
     * Destructor, zeroes all data
     *
     */
    public void finalize() {
 
        super.Initialize();
 
        this.chiSquared = 0.0;
        this.blockNumber = 0;
        this.bitsDiscarded = 0;
    }
 
    /**
     * Gets the BaseRandomTest random state of the last executed BaseCryptoRandomStream
     *
     * @return    boolean indication if last computed CryptoRandomStream was a randomized stream
     *            true:   last verified stream was randomized
     *            false:  last verified stream was not randomized
     */
    public boolean IsRandom() {
 
        return super.IsRandom();
    }
 
    /**
     * Tests the BaseCryptoRandomStream executed and returns the random value
     *
     * @param     bitStream   bitStream to be verified for randomness properties
     * @return    boolean     indication if CryptoRandomStream is a randomized stream
     *            true:       last verified stream was randomized
     *            false:      last verified stream was not randomized
     */
    public boolean IsRandom(BaseCryptoRandomStream bitStream) {
        int i, j;
        double blockSum, arg1, arg2;
        double sum, pi, v;
 
        if (bitStream.GetBitLength() < this.GetMinimumLength()) {
            this.error = RandomTestErrors.InsufficientNumberOfBits;
            this.random = false;
            return this.random;
        }
        bitStream.SetBitPosition(0);
        this.error = RandomTestErrors.NoError;
        this.blockNumber =
                (int)Math.floor((double)bitStream.GetBitLength() / (double)this.blockLength); // Number of Stream blocks
        sum = 0.0;
        for (i = 0; i < this.blockNumber; i++) { // N=10000 for each substring block
            pi = 0.0;
            blockSum = 0.0;
            bitStream.SetBitPosition(i * this.blockLength);
            for (j = 0; j < this.blockLength; j++) // m=100 compute the "i"th Pi Value */
                blockSum += bitStream.GetBitForward();
            pi = (double)blockSum / (double)this.blockLength;
            v = pi - 0.5;
            sum += v * v;
        }
        this.chiSquared = 4.0 * this.blockLength * sum;
        arg1 = (double)this.blockNumber / 2.e0;
        arg2 = this.chiSquared / 2.e0;
        this.pValue = this.mathFuncs.IGammaC(arg1, arg2);
        if (Double.isNaN(this.pValue)) {
            this.pValue = 0;
            this.error = RandomTestErrors.MathematicianNAN;
            this.random = false;
        } else {
            if (this.pValue < this.alpha) {
                this.random = false;
            } else {
                this.random = true;
            }
        }
        this.bitsDiscarded = bitStream.GetBitLength() % this.blockLength;
        return this.random;
    }
 
    /**
     * Initializes the object
     *
     */
    public void Initialize() {
 
        super.Initialize();
    }
 
    /**
     * Gets the type of the object
     *
     * @return    RandomTests:     the concrete type class of the random number test, BlockFrequency test for this class
     */
    public RandomTests GetType() {
 
        return BlockFrequencyTest.TEST;
    }
 
    /**
     * Gets the minimum random stream length
     *
     * @return    int:    minimum length in bits of streams that can be checked by this test
     */
    public int GetMinimumLength() {
 
        return BlockFrequencyTest.MINIMUMLENGTH;
    }
 
    /**
     * Sets the "block" parameter
     *
     * @param     block    sets the block length in bits that Block Frequency test will use for checking randomness
     */
    public void SetBlockLength(int block) {
 
        this.blockLength = block;
    }
 
    /**
     * Gets the "block length" parameter, block length in bits
     *
     * @return    int:    gets the block length that Block Frequency test is using for checking randomness
     */
    public int GetBlockLength() {
 
        return this.blockLength;
    }
 
    /**
     * Gets the "ChiSquared" result
     *
     * @return    double:    gets the "chi squared" result of last random test computed
     */
    public double GetChiSquared() {
 
        return this.chiSquared;
    }
 
    /**
     * Gets the number of blocks tested
     *
     * @return    int:    CryptoRandomStream number of blocks computed in last random test
     */
    public int GetBlockNumber() {
 
        return this.blockNumber;
    }
 
    /**
     * Gets the number of bits discarded and not tested with last CryptoRandomStream computed
     *
     * @return    int:    number of blocks of last CryptoRandomStream computed
     */
    public int GetBitsDiscarded() {
 
        return this.bitsDiscarded;
    }
 
}