/*

 * Copyright (c) 1997 - 2001 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 the Institute 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 THE INSTITUTE AND 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 THE INSTITUTE OR 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"

/**

 * Zero out a keyblock

 *

 * @param keyblock keyblock to zero out

 *

 * @ingroup krb5_crypto

 */

KRB5_LIB_FUNCTION void KRB5_LIB_CALL

krb5_keyblock_zero(krb5_keyblock *keyblock)

{

    keyblock->keytype = 0;

    krb5_data_zero(&keyblock->keyvalue);

}

/**

 * Free a keyblock's content, also zero out the content of the keyblock.

 *

 * @param context a Kerberos 5 context

 * @param keyblock keyblock content to free, NULL is valid argument

 *

 * @ingroup krb5_crypto

 */

KRB5_LIB_FUNCTION void KRB5_LIB_CALL

krb5_free_keyblock_contents(krb5_context context,

          krb5_keyblock *keyblock)

{

    if(keyblock) {

  if (keyblock->keyvalue.data != NULL)

      memset_s(keyblock->keyvalue.data, keyblock->keyvalue.length,

         0, keyblock->keyvalue.length);

  krb5_data_free (&keyblock->keyvalue);

  keyblock->keytype = KRB5_ENCTYPE_NULL;

    }

}

/**

 * Free a keyblock, also zero out the content of the keyblock, uses

 * krb5_free_keyblock_contents() to free the content.

 *

 * @param context a Kerberos 5 context

 * @param keyblock keyblock to free, NULL is valid argument

 *

 * @ingroup krb5_crypto

 */

KRB5_LIB_FUNCTION void KRB5_LIB_CALL

krb5_free_keyblock(krb5_context context,

       krb5_keyblock *keyblock)

{

    if(keyblock){

  krb5_free_keyblock_contents(context, keyblock);

  free(keyblock);

    }

}

/**

 * Copy a keyblock, free the output keyblock with

 * krb5_free_keyblock_contents().

 *

 * @param context a Kerberos 5 context

 * @param inblock the key to copy

 * @param to the output key.

 *

 * @return 0 on success or a Kerberos 5 error code

 *

 * @ingroup krb5_crypto

 */

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL

krb5_copy_keyblock_contents (krb5_context context,

           const krb5_keyblock *inblock,

           krb5_keyblock *to)

{

    return copy_EncryptionKey(inblock, to);

}

/**

 * Copy a keyblock, free the output keyblock with

 * krb5_free_keyblock().

 *

 * @param context a Kerberos 5 context

 * @param inblock the key to copy

 * @param to the output key.

 *

 * @return 0 on success or a Kerberos 5 error code

 *

 * @ingroup krb5_crypto

 */

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL

krb5_copy_keyblock (krb5_context context,

        const krb5_keyblock *inblock,

        krb5_keyblock **to)

{

    krb5_error_code ret;

    krb5_keyblock *k;

    *to = NULL;

    k = calloc (1, sizeof(*k));

    if (k == NULL)

  return krb5_enomem(context);

    ret = krb5_copy_keyblock_contents (context, inblock, k);

    if (ret) {

      free(k);

      return ret;

    }

    *to = k;

    return 0;

}

/**

 * Get encryption type of a keyblock.

 *

 * @ingroup krb5_crypto

 */

KRB5_LIB_FUNCTION krb5_enctype KRB5_LIB_CALL

krb5_keyblock_get_enctype(const krb5_keyblock *block)

{

    return block->keytype;

}

/**

 * Fill in `key' with key data of type `enctype' from `data' of length

 * `size'. Key should be freed using krb5_free_keyblock_contents().

 *

 * @return 0 on success or a Kerberos 5 error code

 *

 * @ingroup krb5_crypto

 */

KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL

krb5_keyblock_init(krb5_context context,

       krb5_enctype type,

       const void *data,

       size_t size,

       krb5_keyblock *key)

{

    krb5_error_code ret;

    size_t len;

    memset(key, 0, sizeof(*key));

    ret = krb5_enctype_keysize(context, type, &len);

    if (ret)

  return ret;

    if (len != size) {

  krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,

             "Encryption key %d is %lu bytes "

             "long, %lu was passed in",

             type, (unsigned long)len, (unsigned long)size);

  return KRB5_PROG_ETYPE_NOSUPP;

    }

    ret = krb5_data_copy(&key->keyvalue, data, len);

    if(ret) {

  krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));

  return ret;

    }

    key->keytype = type;

    return 0;

}