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/*
* Copyright (C) 1998 by the FundsXpress, INC.
*
* 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 FundsXpress. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. FundsXpress makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include "k5-int.h"
#include "old.h"
void
krb5_old_encrypt_length(const struct krb5_enc_provider *enc,
const struct krb5_hash_provider *hash,
size_t inputlen,
size_t *length)
{
size_t blocksize, hashsize;
(*(enc->block_size))(&blocksize);
(*(hash->hash_size))(&hashsize);
*length = krb5_roundup(blocksize+hashsize+inputlen, blocksize);
}
krb5_error_code
krb5_old_encrypt(const struct krb5_enc_provider *enc,
const struct krb5_hash_provider *hash,
const krb5_keyblock *key,
krb5_keyusage usage,
const krb5_data *ivec,
const krb5_data *input,
krb5_data *output)
{
krb5_error_code ret;
size_t blocksize, hashsize, enclen;
krb5_data datain, crcivec;
int real_ivec;
(*(enc->block_size))(&blocksize);
(*(hash->hash_size))(&hashsize);
krb5_old_encrypt_length(enc, hash, input->length, &enclen);
if (output->length < enclen)
return(KRB5_BAD_MSIZE);
output->length = enclen;
/* fill in confounded, padded, plaintext buffer with zero checksum */
memset(output->data, 0, output->length);
datain.length = blocksize;
datain.data = output->data;
if ((ret = krb5_c_random_make_octets(/* XXX */ 0, &datain)))
return(ret);
memcpy(output->data+blocksize+hashsize, input->data, input->length);
/* compute the checksum */
datain.length = hashsize;
datain.data = output->data+blocksize;
if ((ret = ((*(hash->hash))(1, output, &datain))))
goto cleanup;
/* encrypt it */
/* XXX this is gross, but I don't have much choice */
if ((key->enctype == ENCTYPE_DES_CBC_CRC) && (ivec == 0)) {
crcivec.length = key->length;
crcivec.data = (char *) key->contents;
ivec = &crcivec;
real_ivec = 0;
} else
real_ivec = 1;
if ((ret = ((*(enc->encrypt))(key, ivec, output, output))))
goto cleanup;
/* update ivec */
if (real_ivec && ivec != NULL && ivec->length == blocksize)
memcpy(ivec->data, output->data + output->length - blocksize,
blocksize);
cleanup:
if (ret)
memset(output->data, 0, output->length);
return(ret);
}
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