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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
* 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 "crypto_int.h"
krb5_error_code KRB5_CALLCONV
krb5_k_encrypt(krb5_context context, krb5_key key,
krb5_keyusage usage, const krb5_data *cipher_state,
const krb5_data *input, krb5_enc_data *output)
{
const struct krb5_keytypes *ktp;
krb5_crypto_iov iov[4];
krb5_error_code ret;
unsigned int header_len, padding_len, trailer_len, total_len;
ktp = find_enctype(key->keyblock.enctype);
if (ktp == NULL)
return KRB5_BAD_ENCTYPE;
output->magic = KV5M_ENC_DATA;
output->kvno = 0;
output->enctype = key->keyblock.enctype;
/* Get the lengths of the token parts and compute the total. */
header_len = ktp->crypto_length(ktp, KRB5_CRYPTO_TYPE_HEADER);
padding_len = krb5int_c_padding_length(ktp, input->length);
trailer_len = ktp->crypto_length(ktp, KRB5_CRYPTO_TYPE_TRAILER);
total_len = header_len + input->length + padding_len + trailer_len;
if (output->ciphertext.length < total_len)
return KRB5_BAD_MSIZE;
/* Set up the iov structures for the token parts. */
iov[0].flags = KRB5_CRYPTO_TYPE_HEADER;
iov[0].data = make_data(output->ciphertext.data, header_len);
iov[1].flags = KRB5_CRYPTO_TYPE_DATA;
iov[1].data = make_data(output->ciphertext.data + header_len,
input->length);
memcpy(iov[1].data.data, input->data, input->length);
iov[2].flags = KRB5_CRYPTO_TYPE_PADDING;
iov[2].data = make_data(iov[1].data.data + input->length, padding_len);
iov[3].flags = KRB5_CRYPTO_TYPE_TRAILER;
iov[3].data = make_data(iov[2].data.data + padding_len, trailer_len);
ret = ktp->encrypt(ktp, key, usage, cipher_state, iov, 4);
if (ret != 0)
zap(iov[1].data.data, iov[1].data.length);
else
output->ciphertext.length = total_len;
return ret;
}
krb5_error_code KRB5_CALLCONV
krb5_c_encrypt(krb5_context context, const krb5_keyblock *keyblock,
krb5_keyusage usage, const krb5_data *cipher_state,
const krb5_data *input, krb5_enc_data *output)
{
krb5_key key;
krb5_error_code ret;
ret = krb5_k_create_key(context, keyblock, &key);
if (ret != 0)
return ret;
ret = krb5_k_encrypt(context, key, usage, cipher_state, input, output);
krb5_k_free_key(context, key);
return ret;
}
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