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/*
* $Source$
* $Author$
*
* Copyright 1990,1991 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America is assumed
* to 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
*/
#if !defined(lint) && !defined(SABER)
static char rcsid_decrypt_key_c [] =
"$Id$";
#endif /* !lint & !SABER */
#include <krb5/krb5.h>
#include <krb5/ext-proto.h>
#include <krb5/kdb.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_kdb_decrypt_key(eblock, in, out)
krb5_encrypt_block *eblock;
const krb5_encrypted_keyblock *in;
krb5_keyblock *out;
{
krb5_error_code retval;
/* the encrypted version is stored as the unencrypted key length
(in host byte order), followed by the encrypted key.
*/
out->keytype = in->keytype;
out->length = krb5_encrypt_size(in->length-sizeof(in->length),
eblock->crypto_entry);
out->contents = (krb5_octet *)malloc(out->length);
if (!out->contents) {
out->contents = 0;
out->length = 0;
return ENOMEM;
}
/* copy out the real length count */
memcpy((char *)&out->length, (char *)in->contents, sizeof(out->length));
/* remember the contents of the encrypted version has a sizeof(in->length)
integer length of the real embedded key, followed by the
encrypted key, so the offset here is needed */
if (retval = krb5_decrypt((krb5_pointer) (((char *) in->contents) +
sizeof(in->length)),
(krb5_pointer) out->contents,
in->length-sizeof(in->length), eblock, 0)) {
xfree(out->contents);
out->contents = 0;
out->length = 0;
return retval;
}
if (out->length < 0) {
xfree(out->contents);
out->contents = 0;
out->length = 0;
return KRB5_KDB_INVALIDKEYSIZE;
}
return retval;
}
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