/*
 * Copyright (c) 2005 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of KTH nor the names of its contributors may be
 *    used to endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY KTH AND ITS CONTRIBUTORS ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL KTH OR ITS CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

#include "krb5_locl.h"
#include <err.h>
#include <getarg.h>

static void
test_wrapping(krb5_context context,
              size_t min_size,
              size_t max_size,
              size_t step,
              krb5_enctype etype)
{
    krb5_error_code ret;
    krb5_keyblock key;
    krb5_crypto crypto;
    krb5_data data;
    char *etype_name;
    void *buf;
    size_t size;

    ret = krb5_generate_random_keyblock(context, etype, &key);
    if (ret)
        krb5_err(context, 1, ret, "krb5_generate_random_keyblock");

    ret = krb5_enctype_to_string(context, etype, &etype_name);
    if (ret)
        krb5_err(context, 1, ret, "krb5_enctype_to_string");

    buf = malloc(max_size);
    if (buf == NULL)
        krb5_errx(context, 1, "out of memory");
    memset(buf, 0, max_size);

    ret = krb5_crypto_init(context, &key, 0, &crypto);
    if (ret)
        krb5_err(context, 1, ret, "krb5_crypto_init");

    for (size = min_size; size < max_size; size += step) {
        size_t wrapped_size;

        ret = krb5_encrypt(context, crypto, 0, buf, size, &data);
        if (ret)
            krb5_err(context, 1, ret, "encrypt size %lu using %s",
                     (unsigned long)size, etype_name);

        wrapped_size = krb5_get_wrapped_length(context, crypto, size);

        if (wrapped_size != data.length)
            krb5_errx(context, 1, "calculated wrapped length %lu != "
                      "real wrapped length %lu for data length %lu using "
                      "enctype %s",
                      (unsigned long)wrapped_size,
                      (unsigned long)data.length,
                      (unsigned long)size,
                      etype_name);
        krb5_data_free(&data);
    }

    free(etype_name);
    free(buf);
    krb5_crypto_destroy(context, crypto);
    krb5_free_keyblock_contents(context, &key);
}



static int version_flag = 0;
static int help_flag    = 0;

static struct getargs args[] = {
    {"version", 0,      arg_flag,       &version_flag,
     "print version", NULL },
    {"help",    0,      arg_flag,       &help_flag,
     NULL, NULL }
};

static void
usage (int ret)
{
    arg_printusage (args,
                    sizeof(args)/sizeof(*args),
                    NULL,
                    "");
    exit (ret);
}

int
main(int argc, char **argv)
{
    krb5_context context;
    krb5_error_code ret;
    int i, optidx = 0;

    krb5_enctype enctypes[] = {
#ifdef HEIM_WEAK_CRYPTO
        ETYPE_DES_CBC_CRC,
        ETYPE_DES_CBC_MD4,
        ETYPE_DES_CBC_MD5,
#endif
        ETYPE_DES3_CBC_SHA1,
        ETYPE_ARCFOUR_HMAC_MD5,
        ETYPE_AES128_CTS_HMAC_SHA1_96,
        ETYPE_AES256_CTS_HMAC_SHA1_96
    };

    setprogname(argv[0]);

    if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optidx))
        usage(1);

    if (help_flag)
        usage (0);

    if(version_flag){
        print_version(NULL);
        exit(0);
    }

    argc -= optidx;
    argv += optidx;

    ret = krb5_init_context(&context);
    if (ret)
        errx (1, "krb5_init_context failed: %d", ret);

    for (i = 0; i < sizeof(enctypes)/sizeof(enctypes[0]); i++) {
        krb5_enctype_enable(context, enctypes[i]);

        test_wrapping(context, 0, 1024, 1, enctypes[i]);
        test_wrapping(context, 1024, 1024 * 100, 1024, enctypes[i]);
    }
    krb5_free_context(context);

    return 0;
}