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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/krb/ser_key.c - Serialize krb5_keyblock structure */
/*
* Copyright 1995, 2008 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. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* 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.
*/
#include "k5-int.h"
#include "int-proto.h"
/*
* Routines to deal with externalizing the krb5_keyblock:
* krb5_keyblock_size();
* krb5_keyblock_externalize();
* krb5_keyblock_internalize();
*/
static krb5_error_code krb5_keyblock_size
(krb5_context, krb5_pointer, size_t *);
static krb5_error_code krb5_keyblock_externalize
(krb5_context, krb5_pointer, krb5_octet **, size_t *);
static krb5_error_code krb5_keyblock_internalize
(krb5_context,krb5_pointer *, krb5_octet **, size_t *);
/* Local data */
static const krb5_ser_entry krb5_keyblock_ser_entry = {
KV5M_KEYBLOCK, /* Type */
krb5_keyblock_size, /* Sizer routine */
krb5_keyblock_externalize, /* Externalize routine */
krb5_keyblock_internalize /* Internalize routine */
};
/*
* krb5_keyblock_size() - Determine the size required to externalize
* the krb5_keyblock.
*/
static krb5_error_code
krb5_keyblock_size(krb5_context kcontext, krb5_pointer arg, size_t *sizep)
{
krb5_error_code kret;
krb5_keyblock *keyblock;
/*
* krb5_keyblock requires:
* krb5_int32 for KV5M_KEYBLOCK
* krb5_int32 for enctype
* krb5_int32 for length
* keyblock->length for contents
* krb5_int32 for KV5M_KEYBLOCK
*/
kret = EINVAL;
if ((keyblock = (krb5_keyblock *) arg)) {
*sizep += (sizeof(krb5_int32) +
sizeof(krb5_int32) +
sizeof(krb5_int32) +
sizeof(krb5_int32) +
sizeof(krb5_int32) +
(size_t) keyblock->length);
kret = 0;
}
return(kret);
}
/*
* krb5_keyblock_externalize() - Externalize the krb5_keyblock.
*/
static krb5_error_code
krb5_keyblock_externalize(krb5_context kcontext, krb5_pointer arg, krb5_octet **buffer, size_t *lenremain)
{
krb5_error_code kret;
krb5_keyblock *keyblock;
size_t required;
krb5_octet *bp;
size_t remain;
required = 0;
bp = *buffer;
remain = *lenremain;
kret = EINVAL;
if ((keyblock = (krb5_keyblock *) arg)) {
kret = ENOMEM;
if (!krb5_keyblock_size(kcontext, arg, &required) &&
(required <= remain)) {
/* Our identifier */
(void) krb5_ser_pack_int32(KV5M_KEYBLOCK, &bp, &remain);
/* Our enctype */
(void) krb5_ser_pack_int32((krb5_int32) keyblock->enctype,
&bp, &remain);
/* Our length */
(void) krb5_ser_pack_int32((krb5_int32) keyblock->length,
&bp, &remain);
/* Our contents */
(void) krb5_ser_pack_bytes(keyblock->contents,
(size_t) keyblock->length,
&bp, &remain);
/* Finally, our trailer */
(void) krb5_ser_pack_int32(KV5M_KEYBLOCK, &bp, &remain);
kret = 0;
*buffer = bp;
*lenremain = remain;
}
}
return(kret);
}
/*
* krb5_keyblock_internalize() - Internalize the krb5_keyblock.
*/
static krb5_error_code
krb5_keyblock_internalize(krb5_context kcontext, krb5_pointer *argp, krb5_octet **buffer, size_t *lenremain)
{
krb5_error_code kret;
krb5_keyblock *keyblock;
krb5_int32 ibuf;
krb5_octet *bp;
size_t remain;
bp = *buffer;
remain = *lenremain;
kret = EINVAL;
/* Read our magic number */
if (krb5_ser_unpack_int32(&ibuf, &bp, &remain))
ibuf = 0;
if (ibuf == KV5M_KEYBLOCK) {
kret = ENOMEM;
/* Get a keyblock */
if ((remain >= (3*sizeof(krb5_int32))) &&
(keyblock = (krb5_keyblock *) calloc(1, sizeof(krb5_keyblock)))) {
/* Get the enctype */
(void) krb5_ser_unpack_int32(&ibuf, &bp, &remain);
keyblock->enctype = (krb5_enctype) ibuf;
/* Get the length */
(void) krb5_ser_unpack_int32(&ibuf, &bp, &remain);
keyblock->length = (int) ibuf;
/* Get the string */
if ((keyblock->contents = (krb5_octet *) malloc((size_t) (ibuf)))&&
!(kret = krb5_ser_unpack_bytes(keyblock->contents,
(size_t) ibuf,
&bp, &remain))) {
kret = krb5_ser_unpack_int32(&ibuf, &bp, &remain);
if (!kret && (ibuf == KV5M_KEYBLOCK)) {
kret = 0;
*buffer = bp;
*lenremain = remain;
keyblock->magic = KV5M_KEYBLOCK;
*argp = (krb5_pointer) keyblock;
}
else
kret = EINVAL;
}
if (kret) {
if (keyblock->contents)
free(keyblock->contents);
free(keyblock);
}
}
}
return(kret);
}
/*
* Register the keyblock serializer.
*/
krb5_error_code
krb5_ser_keyblock_init(krb5_context kcontext)
{
return(krb5_register_serializer(kcontext, &krb5_keyblock_ser_entry));
}
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