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/*
* lib/kdb/encrypt_key.c
*
* Copyright 1990,1991 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. 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.
*
*
* krb5_kdb_encrypt_key(), krb5_kdb_decrypt_key functions
*/
#include "k5-int.h"
/*
* Encrypt a key for storage in the database. "eblock" is used
* to encrypt the key in "in" into "out"; the storage pointed to by "out"
* is allocated before use.
*/
krb5_error_code
krb5_dbekd_encrypt_key_data(context, eblock, keyblock, keysalt, keyver,key_data)
krb5_context context;
krb5_encrypt_block * eblock;
const krb5_keyblock * keyblock;
const krb5_keysalt * keysalt;
int keyver;
krb5_key_data * key_data;
{
krb5_error_code retval;
krb5_keyblock tmp;
krb5_octet * ptr;
krb5_int16 len;
int i;
for (i = 0; i < key_data->key_data_ver; i++)
if (key_data->key_data_contents[i])
krb5_xfree(key_data->key_data_contents[i]);
key_data->key_data_ver = 1;
key_data->key_data_kvno = keyver;
/*
* The First element of the type/length/contents
* fields is the key type/length/contents
*/
key_data->key_data_type[0] = keyblock->keytype;
key_data->key_data_length[0] = krb5_encrypt_size(keyblock->length,
eblock->crypto_entry) + 2;
/*
* because of checksum space requirements imposed by the encryption
* interface, we need to copy the input key into a larger area.
*/
tmp.contents = (krb5_octet *)malloc(key_data->key_data_length[0] - 2);
len = tmp.length = keyblock->length;
if (tmp.contents == NULL)
return ENOMEM;
memcpy((char *)tmp.contents, (const char *)keyblock->contents, tmp.length);
key_data->key_data_contents[0] = ptr = (krb5_octet *)malloc(
key_data->key_data_length[0]);
if (key_data->key_data_contents[0] == NULL) {
krb5_xfree(tmp.contents);
return ENOMEM;
}
krb5_kdb_encode_int16(len, ptr);
ptr += 2;
if ((retval = krb5_encrypt(context, (krb5_pointer) tmp.contents,
(krb5_pointer)(ptr), tmp.length,
eblock, 0))) {
krb5_xfree(key_data->key_data_contents[0]);
krb5_xfree(tmp.contents);
return retval;
}
krb5_xfree(tmp.contents);
/* After key comes the salt in necessary */
if (keysalt) {
key_data->key_data_type[1] = keysalt->type;
if (key_data->key_data_type[1] >= 0) {
key_data->key_data_ver++;
key_data->key_data_length[1] = keysalt->data.length;
if (keysalt && keysalt->data.length) {
key_data->key_data_contents[1] =
(krb5_octet *)malloc(keysalt->data.length);
if (key_data->key_data_contents[1] == NULL) {
krb5_xfree(key_data->key_data_contents[0]);
return ENOMEM;
}
memcpy(key_data->key_data_contents[1],
keysalt->data.data,
(size_t) keysalt->data.length);
}
}
}
return retval;
}
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