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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* Copyright (C) 2009 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* Functions for manipulating krb5_key structures
*/
#include "k5-int.h"
/*
* The krb5_key data type wraps an exposed keyblock in an opaque data
* structure, to allow for internal optimizations such as caching of
* derived keys.
*/
/* Create a krb5_key from the enctype and key data in a keyblock. */
krb5_error_code KRB5_CALLCONV
krb5_k_create_key(krb5_context context, const krb5_keyblock *key_data,
krb5_key *out)
{
krb5_key key = NULL;
krb5_error_code code;
*out = NULL;
key = malloc(sizeof(*key));
if (key == NULL)
return ENOMEM;
code = krb5int_c_copy_keyblock_contents(context, key_data, &key->keyblock);
if (code)
goto cleanup;
key->refcount = 1;
key->derived = NULL;
*out = key;
return 0;
cleanup:
free(key);
return code;
}
void KRB5_CALLCONV
krb5_k_reference_key(krb5_context context, krb5_key key)
{
if (key)
key->refcount++;
}
/* Free the memory used by a krb5_key. */
void KRB5_CALLCONV
krb5_k_free_key(krb5_context context, krb5_key key)
{
struct derived_key *dk;
if (key == NULL || --key->refcount > 0)
return;
/* Free the derived key cache. */
while ((dk = key->derived) != NULL) {
key->derived = dk->next;
free(dk->constant.data);
krb5_k_free_key(context, dk->dkey);
free(dk);
}
krb5int_c_free_keyblock_contents(context, &key->keyblock);
free(key);
}
/* Retrieve a copy of the keyblock from a krb5_key. */
krb5_error_code KRB5_CALLCONV
krb5_k_key_keyblock(krb5_context context, krb5_key key,
krb5_keyblock **key_data)
{
return krb5int_c_copy_keyblock(context, &key->keyblock, key_data);
}
/* Retrieve the enctype of a krb5_key. */
krb5_enctype KRB5_CALLCONV
krb5_k_key_enctype(krb5_context context, krb5_key key)
{
return key->keyblock.enctype;
}
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