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/*
* $Source$
* $Author$
*
* Copyright 1990,1991 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* For copying and distribution information, please see the file
* <krb5/copyright.h>.
*
* krb5_kdb_encrypt_key(), krb5_kdb_decrypt_key functions
*/
#if !defined(lint) && !defined(SABER)
static char rcsid_encrypt_key_c [] =
"$Id$";
#endif /* !lint & !SABER */
#include <krb5/krb5.h>
#include <krb5/ext-proto.h>
#include <krb5/kdb.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_kdb_encrypt_key(eblock, in, out)
krb5_encrypt_block *eblock;
const krb5_keyblock *in;
krb5_encrypted_keyblock *out;
{
/* encrypted rep has the real (unencrypted) key length stored
along with the encrypted key */
krb5_error_code retval;
krb5_keyblock tmpin;
out->keytype = in->keytype;
out->length = krb5_encrypt_size(in->length, eblock->crypto_entry);
/* because of checksum space requirements imposed by the encryption
interface, we need to copy the input key into a larger area. */
tmpin.length = in->length;
tmpin.contents = (krb5_octet *)malloc(out->length);
if (!tmpin.contents) {
out->length = 0;
return ENOMEM;
}
memcpy((char *)tmpin.contents, (const char *)in->contents, tmpin.length);
out->length += sizeof(out->length);
out->contents = (krb5_octet *)malloc(out->length);
if (!out->contents) {
xfree(tmpin.contents);
out->contents = 0;
out->length = 0;
return ENOMEM;
}
/* copy in real length */
memcpy((char *)out->contents, (const char *)&tmpin.length,
sizeof(out->length));
/* and arrange for encrypted key */
retval = krb5_encrypt((krb5_pointer) tmpin.contents,
(krb5_pointer) (((char *) out->contents) +
sizeof(out->length)),
tmpin.length, eblock, 0);
xfree(tmpin.contents);
if (retval) {
xfree(out->contents);
out->contents = 0;
out->length = 0;
}
return retval;
}
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