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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*! \file */
#include <config.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <isc/entropy.h>
#include <isc/mem.h>
#include <isc/print.h>
#include <isc/string.h>
#include <isc/util.h>
static void
hex_dump(const char *msg, void *data, unsigned int length) {
unsigned int len;
unsigned char *base;
bool first = true;
base = data;
printf("DUMP of %u bytes: %s\n\t", length, msg);
for (len = 0; len < length; len++) {
if (len % 16 == 0 && !first)
printf("\n\t");
printf("%02x ", base[len]);
first = false;
}
printf("\n");
}
static void
CHECK(const char *msg, isc_result_t result) {
if (result != ISC_R_SUCCESS) {
printf("FAILURE: %s: %s\n", msg, isc_result_totext(result));
exit(1);
}
}
int
main(int argc, char **argv) {
isc_mem_t *mctx;
unsigned char buffer[512];
isc_entropy_t *ent;
unsigned int returned;
unsigned int flags;
isc_result_t result;
UNUSED(argc);
UNUSED(argv);
mctx = NULL;
CHECK("isc_mem_create()",
isc_mem_create(0, 0, &mctx));
ent = NULL;
CHECK("isc_entropy_create()",
isc_entropy_create(mctx, &ent));
isc_entropy_stats(ent, stderr);
#if 1
CHECK("isc_entropy_createfilesource() 1",
isc_entropy_createfilesource(ent, "/dev/random"));
CHECK("isc_entropy_createfilesource() 2",
isc_entropy_createfilesource(ent, "/dev/random"));
#else
CHECK("isc_entropy_createfilesource() 3",
isc_entropy_createfilesource(ent, "/tmp/foo"));
#endif
fprintf(stderr,
"Reading 32 bytes of GOOD random data only, partial OK\n");
flags = 0;
flags |= ISC_ENTROPY_GOODONLY;
flags |= ISC_ENTROPY_PARTIAL;
result = isc_entropy_getdata(ent, buffer, 32, &returned, flags);
if (result == ISC_R_NOENTROPY) {
fprintf(stderr, "No entropy.\n");
goto any;
}
hex_dump("good data only:", buffer, returned);
any:
isc_entropy_stats(ent, stderr);
CHECK("isc_entropy_getdata() pseudorandom",
isc_entropy_getdata(ent, buffer, 128, NULL, 0));
hex_dump("pseudorandom data", buffer, 128);
isc_entropy_stats(ent, stderr);
flags = 0;
flags |= ISC_ENTROPY_GOODONLY;
flags |= ISC_ENTROPY_BLOCKING;
result = isc_entropy_getdata(ent, buffer, sizeof(buffer), &returned,
flags);
CHECK("good data only, blocking mode", result);
hex_dump("blocking mode data", buffer, sizeof(buffer));
{
isc_entropy_t *entcopy1 = NULL;
isc_entropy_t *entcopy2 = NULL;
isc_entropy_t *entcopy3 = NULL;
isc_entropy_attach(ent, &entcopy1);
isc_entropy_attach(ent, &entcopy2);
isc_entropy_attach(ent, &entcopy3);
isc_entropy_stats(ent, stderr);
isc_entropy_detach(&entcopy1);
isc_entropy_detach(&entcopy2);
isc_entropy_detach(&entcopy3);
}
isc_entropy_detach(&ent);
isc_mem_stats(mctx, stderr);
isc_mem_destroy(&mctx);
return (0);
}
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