Sunday, 22 October 2017
arrow Previous Versions arrow JDiceLock 6.0.0.1 arrow RandomTest arrow CumulativeSumForwardTest.java
CumulativeSumForwardTest.java (Cumulative Sum Forward 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
 
//
// 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 Cumulative Sum Forward random number test
 *
 * @author      Angel Ferré @ DiceLock Security
 * @version     6.0.0.1
 * @since       2011-09-30
 */
public class CumulativeSumForwardTest extends BaseRandomTest {
 
    /**
     * Random Test Class enumerator name
     */
    protected static final RandomTests TEST = RandomTests.CumulativeSumForward;
 
    /**
     * Random Test Class minimum stream length
     */
    protected static final int MINIMUMLENGTH = 100;
 
    /**
     * "cuSum" result
     */
    protected double cuSum;
 
    /**
     * Constructor, default
     */
    public CumulativeSumForwardTest() {
 
        super();
 
        this.cuSum = 0;
    }
 
    /**
     * Constructor with a MathematicalFunctions object instantiated
     *
     * @param     mathFuncObj   mathematicalFunctions object that will be used by this object
     */
    public CumulativeSumForwardTest(MathematicalFunctions mathFuncObj) {
 
        super(mathFuncObj);
 
        this.cuSum = 0;
    }
 
    /**
     * Destructor, zeroes all data
     *
     */
    public void finalize() {
 
        this.cuSum = 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, k, start, finish;
        double z, sum, sum1, sum2;
 
        if (bitStream.GetBitLength() < this.GetMinimumLength()) {
            this.error = RandomTestErrors.InsufficientNumberOfBits;
            this.random = false;
            return this.random;
        }
        bitStream.SetBitPosition(0);
        this.error = RandomTestErrors.NoError;
        sum = 0.0;
        this.cuSum = 1;
        for (i = 0; i < (long)bitStream.GetBitLength(); i++) {
            sum += 2 * (int)bitStream.GetBitForward() - 1;
            this.cuSum = this.mathFuncs.max(this.cuSum, Math.abs(sum));
        }
        z = this.cuSum;
        sum1 = 0.0;
        start = (-(int)bitStream.GetBitLength() / (int)z + 1) / 4;
        finish = (bitStream.GetBitLength() / (int)z - 1) / 4;
        for (k = start; k <= finish; k++)
            sum1 +=
(this.mathFuncs.Normal((4 * k + 1) * z / Math.sqrt(bitStream.GetBitLength())) - this.mathFuncs.Normal((4 * k - 1) * z /
                                                                                                      Math.sqrt(bitStream.GetBitLength())));
        sum2 = 0.0;
        start = (-(int)bitStream.GetBitLength() / (int)z - 3) / 4;
        finish = (bitStream.GetBitLength() / (int)z - 1) / 4;
        for (k = start; k <= finish; k++)
            sum2 +=
(this.mathFuncs.Normal((4 * k + 3) * z / Math.sqrt(bitStream.GetBitLength())) - this.mathFuncs.Normal((4 * k + 1) * z /
                                                                                                      Math.sqrt(bitStream.GetBitLength())));
        this.pValue = 1.0 - sum1 + sum2;
        if (this.mathFuncs.isNegative(this.pValue) || this.mathFuncs.isGreaterThanOne(this.pValue)) {
            this.error = RandomTestErrors.PValueOutOfRange;
            this.random = false;
        } else {
            if (this.pValue < this.alpha) {
                this.random = false;
            } else {
                this.random = true;
            }
        }
        return this.random;
    }
 
    /**
     * Initializes the object
     *
     */
    public void Initialize() {
 
        super.Initialize();
        this.cuSum = 0;
    }
 
    /**
     * Gets the type of the object
     *
     * @return    RandomTests:     the concrete type class of the random number test, CumulativeSumForward test for this class
     */
    public RandomTests GetType() {
 
        return CumulativeSumForwardTest.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 CumulativeSumForwardTest.MINIMUMLENGTH;
    }
 
    /**
     * Gets the maximum partial sum
     *
     * @return    double:  maximum partial sum
     */
    public double GetCuSum() {
 
        return this.cuSum;
    }
 
}