3 * $Id: fipstest.c,v 1.2 2000/06/17 12:21:39 mdw Exp $
5 * FIPS 140-1 randomness tests
7 * (c) 2000 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Catacomb.
14 * Catacomb is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU Library General Public License as
16 * published by the Free Software Foundation; either version 2 of the
17 * License, or (at your option) any later version.
19 * Catacomb is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU Library General Public License for more details.
24 * You should have received a copy of the GNU Library General Public
25 * License along with Catacomb; if not, write to the Free
26 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
30 /*----- Revision history --------------------------------------------------*
32 * $Log: fipstest.c,v $
33 * Revision 1.2 2000/06/17 12:21:39 mdw
34 * Add braces to shut compiler up. Reformat code slightly.
36 * Revision 1.1 2000/06/17 10:55:38 mdw
37 * FIPS 140-1 random generator test.
41 /*----- Header files ------------------------------------------------------*/
43 #include <mLib/bits.h>
47 /*----- Main code ---------------------------------------------------------*/
49 /* --- @monobit@ --- *
51 * Arguments: @const octet *p@ = pointer to buffer
53 * Returns: Zero if OK, @FIPSTEST_MONOBIT@ on failure.
55 * Use: Performs the monobit test on a buffer of data. If %$n_1$% is
56 * the number of 1 bits in the buffer, then the monobit test is
57 * passed when %$9654 < n_1 < 10346$%.
60 static unsigned monobit(const octet
*p
)
65 for (i
= 0; i
< FIPSTEST_BUFSZ
; i
++) {
67 for (j
= 0; j
< 8; j
++) {
74 if (9654 >= n1
|| n1
>= 10346)
75 return (FIPSTEST_MONOBIT
);
81 * Arguments: @const octet *p@ = pointer to buffer
83 * Returns: Zero if OK, @FIPSTEST_POKER@ on failure.
85 * Use: Performs the poker test on a buffer of data. The buffer is
86 * divided into 4-bit nibbles %$x_i$%. If
87 * %$f(x) = \sum_{x_i = x} 1$% is the frequency of each nibble,
88 * then the test is passed if
89 * %$1.03 < 16/5000 \sum_i f(i)^2 - 5000 < 57.4$%.
92 static unsigned poker(const octet
*p
)
94 unsigned long f
[16] = { 0 };
98 /* --- Compute the frequencies --- */
100 for (i
= 0; i
< FIPSTEST_BUFSZ
; i
++) {
106 /* --- Now do the comparison --- *
108 * This can be simplified. Multiply through the inequality by 5000 and
109 * we get %$5150 < 16 \sum_i f(i)^2 - 5000^2 < 287000$%.
112 for (i
= 0; i
< 16; i
++)
117 if (5150 >= q
|| q
>= 287000)
118 return (FIPSTEST_POKER
);
124 * Arguments: @const octet *p@ = pointer to buffer
126 * Returns: Zero for success, @FIPSTEST_RUNS@ or @FIPSTEST_LONGRUNS@ on
129 * Use: Performs the runs and long runs tests. The frequency of each
130 * `run', or sequence of equal bits, is counted and tested.
133 static unsigned runs(const octet
*p
)
139 unsigned f
[2][6] = { { 0 } };
141 /* --- Count the run lengths --- */
143 for (i
= 0; i
< FIPSTEST_BUFSZ
; i
++) {
145 for (j
= 0; j
< 8; j
++) {
153 rc
|= FIPSTEST_LONGRUNS
;
165 rc
|= FIPSTEST_LONGRUNS
;
170 /* --- Check the results --- */
172 if (2267 > f
[0][0] || f
[0][0] > 2733 || 2267 > f
[1][0] || f
[1][0] > 2733 ||
173 1079 > f
[0][1] || f
[0][1] > 1421 || 1079 > f
[1][1] || f
[1][1] > 1421 ||
174 502 > f
[0][2] || f
[0][2] > 748 || 502 > f
[1][2] || f
[1][2] > 748 ||
175 223 > f
[0][3] || f
[0][3] > 402 || 223 > f
[1][3] || f
[1][3] > 402 ||
176 90 > f
[0][4] || f
[0][4] > 223 || 90 > f
[1][4] || f
[1][4] > 223 ||
177 90 > f
[0][5] || f
[0][5] > 223 || 90 > f
[1][5] || f
[1][5] > 223)
183 /* --- @fipstest@ --- *
185 * Arguments: @const octet *p@ = pointer to a buffer of @FIPSTEST_BUFSZ@
188 * Returns: Zero if OK, or a bitmask of failed tests.
190 * Use: Performs the FIPS 140-1 randomness tests on a block of data.
193 unsigned fipstest(const octet
*p
)
202 /*----- That's all, folks -------------------------------------------------*/