1 /* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
2 /*
3 * Copyright (C) 1998 by the FundsXpress, INC.
4 *
5 * All rights reserved.
6 *
7 * Export of this software from the United States of America may require
8 * a specific license from the United States Government. It is the
9 * responsibility of any person or organization contemplating export to
10 * obtain such a license before exporting.
11 *
12 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
13 * distribute this software and its documentation for any purpose and
14 * without fee is hereby granted, provided that the above copyright
15 * notice appear in all copies and that both that copyright notice and
16 * this permission notice appear in supporting documentation, and that
17 * the name of FundsXpress. not be used in advertising or publicity pertaining
18 * to distribution of the software without specific, written prior
19 * permission. FundsXpress makes no representations about the suitability of
20 * this software for any purpose. It is provided "as is" without express
21 * or implied warranty.
22 *
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
24 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
25 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
26 */
27
28 #include "crypto_int.h"
29
30 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)31 krb5_k_encrypt(krb5_context context, krb5_key key,
32 krb5_keyusage usage, const krb5_data *cipher_state,
33 const krb5_data *input, krb5_enc_data *output)
34 {
35 const struct krb5_keytypes *ktp;
36 krb5_crypto_iov iov[4];
37 krb5_error_code ret;
38 unsigned int header_len, padding_len, trailer_len, total_len;
39
40 ktp = find_enctype(key->keyblock.enctype);
41 if (ktp == NULL)
42 return KRB5_BAD_ENCTYPE;
43
44 output->magic = KV5M_ENC_DATA;
45 output->kvno = 0;
46 output->enctype = key->keyblock.enctype;
47
48 /* Get the lengths of the token parts and compute the total. */
49 header_len = ktp->crypto_length(ktp, KRB5_CRYPTO_TYPE_HEADER);
50 padding_len = krb5int_c_padding_length(ktp, input->length);
51 trailer_len = ktp->crypto_length(ktp, KRB5_CRYPTO_TYPE_TRAILER);
52 total_len = header_len + input->length + padding_len + trailer_len;
53 if (output->ciphertext.length < total_len)
54 return KRB5_BAD_MSIZE;
55
56 /* Set up the iov structures for the token parts. */
57 iov[0].flags = KRB5_CRYPTO_TYPE_HEADER;
58 iov[0].data = make_data(output->ciphertext.data, header_len);
59
60 iov[1].flags = KRB5_CRYPTO_TYPE_DATA;
61 iov[1].data = make_data(output->ciphertext.data + header_len,
62 input->length);
63 if (input->length > 0)
64 memcpy(iov[1].data.data, input->data, input->length);
65
66 iov[2].flags = KRB5_CRYPTO_TYPE_PADDING;
67 iov[2].data = make_data(iov[1].data.data + input->length, padding_len);
68
69 iov[3].flags = KRB5_CRYPTO_TYPE_TRAILER;
70 iov[3].data = make_data(iov[2].data.data + padding_len, trailer_len);
71
72 ret = ktp->encrypt(ktp, key, usage, cipher_state, iov, 4);
73 if (ret != 0)
74 zap(iov[1].data.data, iov[1].data.length);
75 else
76 output->ciphertext.length = total_len;
77 return ret;
78 }
79
80 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)81 krb5_c_encrypt(krb5_context context, const krb5_keyblock *keyblock,
82 krb5_keyusage usage, const krb5_data *cipher_state,
83 const krb5_data *input, krb5_enc_data *output)
84 {
85 krb5_key key;
86 krb5_error_code ret;
87
88 ret = krb5_k_create_key(context, keyblock, &key);
89 if (ret != 0)
90 return ret;
91 ret = krb5_k_encrypt(context, key, usage, cipher_state, input, output);
92 krb5_k_free_key(context, key);
93 return ret;
94 }
95