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/*
* lib/kdb/decrypt_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"
/*
* Decrypt a key from storage in the database. "eblock" is used
* to decrypt the key in "in" into "out"; the storage pointed to by "out"
* is allocated before use.
*/
krb5_error_code
krb5_dbekd_decrypt_key_data(context, eblock, key_data, keyblock, keysalt)
krb5_context context;
krb5_encrypt_block * eblock;
const krb5_key_data * key_data;
krb5_keyblock * keyblock;
krb5_keysalt * keysalt;
{
krb5_error_code retval = 0;
krb5_int16 tmplen;
krb5_octet * ptr;
keyblock->magic = KV5M_KEYBLOCK;
keyblock->enctype = key_data->key_data_type[0];
/* Decrypt key_data_contents */
if ((keyblock->contents = (krb5_octet *)malloc(krb5_encrypt_size(
key_data->key_data_length[0] - 2, eblock->crypto_entry))) == NULL)
return ENOMEM;
keyblock->length = 0;
ptr = key_data->key_data_contents[0];
if (ptr) {
krb5_kdb_decode_int16(ptr, tmplen);
ptr += 2;
keyblock->length = (int) tmplen;
if ((retval = krb5_decrypt(context, (krb5_pointer) ptr,
(krb5_pointer)keyblock->contents,
key_data->key_data_length[0] - 2,
eblock, 0))) {
krb5_xfree(keyblock->contents);
keyblock->contents = 0;
keyblock->length = 0;
return retval;
}
}
/* Decode salt data */
if (keysalt) {
if (key_data->key_data_ver == 2) {
keysalt->type = key_data->key_data_type[1];
if ((keysalt->data.length = key_data->key_data_length[1])) {
if (!(keysalt->data.data=(char *)malloc(keysalt->data.length))){
krb5_xfree(keyblock->contents);
keyblock->contents = 0;
keyblock->length = 0;
return ENOMEM;
}
memcpy(keysalt->data.data, key_data->key_data_contents[1],
(size_t) keysalt->data.length);
} else
keysalt->data.data = (char *) NULL;
} else {
keysalt->type = KRB5_KDB_SALTTYPE_NORMAL;
keysalt->data.data = (char *) NULL;
keysalt->data.length = 0;
}
}
return retval;
}
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