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
|
/*
* try-anything.c version 20090215
* D. J. Bernstein
* Public domain.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/resource.h>
#include "cpucycles.h"
typedef int uint32;
static uint32 seed[32] = { 3,1,4,1,5,9,2,6,5,3,5,8,9,7,9,3,2,3,8,4,6,2,6,4,3,3,8,3,2,7,9,5 } ;
static uint32 in[12];
static uint32 out[8];
static int outleft = 0;
#define ROTATE(x,b) (((x) << (b)) | ((x) >> (32 - (b))))
#define MUSH(i,b) x = t[i] += (((x ^ seed[i]) + sum) ^ ROTATE(x,b));
static void surf(void)
{
uint32 t[12]; uint32 x; uint32 sum = 0;
int r; int i; int loop;
for (i = 0;i < 12;++i) t[i] = in[i] ^ seed[12 + i];
for (i = 0;i < 8;++i) out[i] = seed[24 + i];
x = t[11];
for (loop = 0;loop < 2;++loop) {
for (r = 0;r < 16;++r) {
sum += 0x9e3779b9;
MUSH(0,5) MUSH(1,7) MUSH(2,9) MUSH(3,13)
MUSH(4,5) MUSH(5,7) MUSH(6,9) MUSH(7,13)
MUSH(8,5) MUSH(9,7) MUSH(10,9) MUSH(11,13)
}
for (i = 0;i < 8;++i) out[i] ^= t[i + 4];
}
}
void randombytes(unsigned char *x,unsigned long long xlen)
{
while (xlen > 0) {
if (!outleft) {
if (!++in[0]) if (!++in[1]) if (!++in[2]) ++in[3];
surf();
outleft = 8;
}
*x = out[--outleft];
++x;
--xlen;
}
}
extern void preallocate(void);
extern void allocate(void);
extern void predoit(void);
extern void doit(void);
extern char checksum[];
extern const char *checksum_compute(void);
extern const char *primitiveimplementation;
static void printword(const char *s)
{
if (!*s) putchar('-');
while (*s) {
if (*s == ' ') putchar('_');
else if (*s == '\t') putchar('_');
else if (*s == '\r') putchar('_');
else if (*s == '\n') putchar('_');
else putchar(*s);
++s;
}
putchar(' ');
}
static void printnum(long long x)
{
printf("%lld ",x);
}
static void fail(const char *why)
{
printf("%s\n",why);
exit(111);
}
unsigned char *alignedcalloc(unsigned long long len)
{
unsigned char *x = (unsigned char *) calloc(1,len + 256);
long long i;
if (!x) fail("out of memory");
/* will never deallocate so shifting is ok */
for (i = 0;i < len + 256;++i) x[i] = random();
x += 64;
x += 63 & (-(unsigned long) x);
for (i = 0;i < len;++i) x[i] = 0;
return x;
}
#define TIMINGS 63
static long long cycles[TIMINGS + 1];
void limits()
{
#ifdef RLIM_INFINITY
struct rlimit r;
r.rlim_cur = 0;
r.rlim_max = 0;
#ifdef RLIMIT_NOFILE
setrlimit(RLIMIT_NOFILE,&r);
#endif
#ifdef RLIMIT_NPROC
setrlimit(RLIMIT_NPROC,&r);
#endif
#ifdef RLIMIT_CORE
setrlimit(RLIMIT_CORE,&r);
#endif
#endif
}
int main()
{
long long i;
long long j;
long long abovej;
long long belowj;
long long checksumcycles;
long long cyclespersecond;
const char *problem;
cyclespersecond = cpucycles_persecond();
preallocate();
limits();
allocate();
srandom(getpid());
cycles[0] = cpucycles();
problem = checksum_compute(); if (problem) fail(problem);
cycles[1] = cpucycles();
checksumcycles = cycles[1] - cycles[0];
predoit();
for (i = 0;i <= TIMINGS;++i) {
cycles[i] = cpucycles();
}
for (i = 0;i <= TIMINGS;++i) {
cycles[i] = cpucycles();
doit();
}
for (i = 0;i < TIMINGS;++i) cycles[i] = cycles[i + 1] - cycles[i];
for (j = 0;j < TIMINGS;++j) {
belowj = 0;
for (i = 0;i < TIMINGS;++i) if (cycles[i] < cycles[j]) ++belowj;
abovej = 0;
for (i = 0;i < TIMINGS;++i) if (cycles[i] > cycles[j]) ++abovej;
if (belowj * 2 < TIMINGS && abovej * 2 < TIMINGS) break;
}
printword(checksum);
printnum(cycles[j]);
printnum(checksumcycles);
printnum(cyclespersecond);
printword(primitiveimplementation);
printf("\n");
return 0;
}
|
