|
1 /* |
|
2 * Portions Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
|
3 * All rights reserved. |
|
4 * This component and the accompanying materials are made available |
|
5 * under the terms of "Eclipse Public License v1.0" |
|
6 * which accompanies this distribution, and is available |
|
7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
|
8 * |
|
9 * Initial Contributors: |
|
10 * Nokia Corporation - initial contribution. |
|
11 * |
|
12 * Contributors: |
|
13 * |
|
14 * Description: |
|
15 * The original NIST Statistical Test Suite code is placed in public domain. |
|
16 * (http://csrc.nist.gov/groups/ST/toolkit/rng/documentation_software.html) |
|
17 * |
|
18 * This software was developed at the National Institute of Standards and Technology by |
|
19 * employees of the Federal Government in the course of their official duties. Pursuant |
|
20 * to title 17 Section 105 of the United States Code this software is not subject to |
|
21 * copyright protection and is in the public domain. The NIST Statistical Test Suite is |
|
22 * an experimental system. NIST assumes no responsibility whatsoever for its use by other |
|
23 * parties, and makes no guarantees, expressed or implied, about its quality, reliability, |
|
24 * or any other characteristic. We would appreciate acknowledgment if the software is used. |
|
25 */ |
|
26 |
|
27 |
|
28 #include "openc.h" |
|
29 #include "../include/externs.h" |
|
30 #include "../include/cephes.h" |
|
31 |
|
32 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * |
|
33 B L O C K F R E Q U E N C Y T E S T |
|
34 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */ |
|
35 |
|
36 void |
|
37 BlockFrequency(int M, int n) |
|
38 { |
|
39 int i, j, N, blockSum; |
|
40 double p_value, sum, pi, v, chi_squared; |
|
41 |
|
42 N = n/M; /* # OF SUBSTRING BLOCKS */ |
|
43 sum = 0.0; |
|
44 |
|
45 for ( i=0; i<N; i++ ) { |
|
46 blockSum = 0; |
|
47 for ( j=0; j<M; j++ ) |
|
48 blockSum += epsilon[j+i*M]; |
|
49 pi = (double)blockSum/(double)M; |
|
50 v = pi - 0.5; |
|
51 sum += v*v; |
|
52 } |
|
53 chi_squared = 4.0 * M * sum; |
|
54 p_value = cephes_igamc(N/2.0, chi_squared/2.0); |
|
55 |
|
56 fprintf(stats[TEST_BLOCK_FREQUENCY], "\t\t\tBLOCK FREQUENCY TEST\n"); |
|
57 fprintf(stats[TEST_BLOCK_FREQUENCY], "\t\t---------------------------------------------\n"); |
|
58 fprintf(stats[TEST_BLOCK_FREQUENCY], "\t\tCOMPUTATIONAL INFORMATION:\n"); |
|
59 fprintf(stats[TEST_BLOCK_FREQUENCY], "\t\t---------------------------------------------\n"); |
|
60 fprintf(stats[TEST_BLOCK_FREQUENCY], "\t\t(a) Chi^2 = %f\n", chi_squared); |
|
61 fprintf(stats[TEST_BLOCK_FREQUENCY], "\t\t(b) # of substrings = %d\n", N); |
|
62 fprintf(stats[TEST_BLOCK_FREQUENCY], "\t\t(c) block length = %d\n", M); |
|
63 fprintf(stats[TEST_BLOCK_FREQUENCY], "\t\t(d) Note: %d bits were discarded.\n", n % M); |
|
64 fprintf(stats[TEST_BLOCK_FREQUENCY], "\t\t---------------------------------------------\n"); |
|
65 |
|
66 fprintf(stats[TEST_BLOCK_FREQUENCY], "%s\t\tp_value = %f\n\n", p_value < ALPHA ? "FAILURE" : "SUCCESS", p_value); |
|
67 fprintf(results[TEST_BLOCK_FREQUENCY], "%f\n", p_value); |
|
68 } |