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/*
* 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
*/
void KRB5_LIB_FUNCTION
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
*/
void KRB5_LIB_FUNCTION
krb5_free_keyblock_contents(krb5_context context,
krb5_keyblock *keyblock)
{
if(keyblock) {
if (keyblock->keyvalue.data != NULL)
memset(keyblock->keyvalue.data, 0, keyblock->keyvalue.length);
krb5_data_free (&keyblock->keyvalue);
keyblock->keytype = 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
*/
void KRB5_LIB_FUNCTION
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_error_code KRB5_LIB_FUNCTION
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_error_code KRB5_LIB_FUNCTION
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) {
krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
return ENOMEM;
}
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_enctype
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_error_code KRB5_LIB_FUNCTION
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;
}
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