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do a head vs tail test on the random buffer.

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@23046 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
2008-04-18 10:02:53 +00:00
parent 5eac702012
commit 42cc51a88a
1 changed files with 42 additions and 7 deletions
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45
lib/hcrypto/test_rand.c
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@@ -55,10 +55,13 @@ static int version_flag;
static int help_flag;
static int len = 1024 * 1024;
static char *rand_method;
static char *filename;
static struct getargs args[] = {
{ "length", 0, arg_integer, &len,
"length", NULL },
{ "file", 0, arg_string, &filename,
"file name", NULL },
{ "method", 0, arg_string, &rand_method,
"method", NULL },
{ "version", 0, arg_flag, &version_flag,
@@ -81,7 +84,7 @@ usage (int ret)
arg_printusage (args,
sizeof(args)/sizeof(args[0]),
NULL,
"out-random-file");
"");
exit (ret);
}
@@ -108,7 +111,7 @@ main(int argc, char **argv)
argc -= idx;
argv += idx;
if (argc < 1)
if (argc != 0)
usage(1);
buffer = emalloc(len);
@@ -133,14 +136,46 @@ main(int argc, char **argv)
if (RAND_bytes(buffer, len) != 1)
errx(1, "RAND_bytes");
rk_dumpdata(argv[0], buffer, len);
if (filename)
rk_dumpdata(filename, buffer, len);
/* head vs tail */
if (len >= 100000) {
int bit, i;
double res;
int bits[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
for (i = 0; i < len; i++) {
unsigned char c = ((unsigned char *)buffer)[i];
for (bit = 0; bit < 8 && c; bit++) {
if (c & 1)
bits[bit]++;
c = c >> 1;
}
}
for (bit = 0; bit < 8; bit++) {
res = ((double)abs(len - bits[bit] * 2)) / (double)len;
if (res > 0.005)
errx(1, "head%d vs tail%d > 0.5%%%% %lf == %d vs %d",
bit, bit, res, len, bits[bit]);
printf("head vs tails bit%d: %lf\n", bit, res);
}
}
free(buffer);
if (RAND_write_file("test.file") != 1)
/* test write random file */
{
static const char *file = "test.file";
if (RAND_write_file(file) != 1)
errx(1, "RAND_write_file");
if (RAND_load_file("test.file", 1024) != 1)
if (RAND_load_file(file, 1024) != 1)
errx(1, "RAND_load_file");
unlink(file);
}
return 0;
}