bin/tests/entropy_test.c

	entropy_test.c revision 630a9557113ab52288de873f563ef35c75a2871a
/*
 * Copyright (C) 2000  Internet Software Consortium.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
 * SOFTWARE.
 */

#include <isc/entropy.h>
#include <isc/mem.h>
#include <isc/util.h>
#include <isc/string.h>

#include <stdio.h>

static void
hex_dump(char *msg, void *data, unsigned int length) {
        unsigned int len;
    unsigned char *base;

    base = data;

        printf("DUMP of %d bytes:  %s\n", length, msg);
        for (len = 0 ; len < length ; len++) {
                if (len % 16 == 0)
                        printf("\n");
                printf("%02x ", base[len]);
        }
        printf("\n");
}

static void
CHECK(const char *msg, isc_result_t result) {
    if (result != ISC_R_SUCCESS) {
        printf("FAILURE:  %s\n", msg);
        exit(1);
    }
}

int
main(int argc, char **argv) {
    isc_mem_t *mctx;
    unsigned char buffer[512];
    isc_entropy_t *ent;
    isc_entropysource_t *devrandom;
    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);

    devrandom = NULL;
    CHECK("isc_entropy_createfilesource()",
          isc_entropy_createfilesource(ent, "/dev/random",
                       0, &devrandom));

    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 out;
    }
    hex_dump("good data only:", buffer, returned);

    isc_entropy_stats(ent, stderr);

    CHECK("isc_entropy_getdata()",
          isc_entropy_getdata(ent, buffer, 128, NULL, 0));

    hex_dump("entropy data", buffer, 128);

out:
    isc_entropy_stats(ent, stderr);

    isc_entropy_destroysource(&devrandom);
    isc_entropy_destroy(&ent);
    isc_mem_stats(mctx, stderr);
    isc_mem_destroy(&mctx);

    return (0);
}