1/*
2 * Copyright (c) 2007 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "config.h"
35
36#ifdef KRB5
37#include <krb5-types.h>
38#endif
39
40#include <string.h>
41
42#include "camellia-ntt.h"
43#include "camellia.h"
44
45#include <roken.h>
46
47int
48CAMELLIA_set_key(const unsigned char *userkey,
49		 const int bits, CAMELLIA_KEY *key)
50{
51    key->bits = bits;
52    Camellia_Ekeygen(bits, userkey, key->key);
53    return 1;
54}
55
56void
57CAMELLIA_encrypt(const unsigned char *in, unsigned char *out,
58		 const CAMELLIA_KEY *key)
59{
60    Camellia_EncryptBlock(key->bits, in, key->key, out);
61
62}
63
64void
65CAMELLIA_decrypt(const unsigned char *in, unsigned char *out,
66		 const CAMELLIA_KEY *key)
67{
68    Camellia_DecryptBlock(key->bits, in, key->key, out);
69}
70
71void
72CAMELLIA_cbc_encrypt(const unsigned char *in, unsigned char *out,
73		     unsigned long size, const CAMELLIA_KEY *key,
74		     unsigned char *iv, int mode_encrypt)
75{
76    unsigned char tmp[CAMELLIA_BLOCK_SIZE];
77    int i;
78
79    if (mode_encrypt) {
80	while (size >= CAMELLIA_BLOCK_SIZE) {
81	    for (i = 0; i < CAMELLIA_BLOCK_SIZE; i++)
82		tmp[i] = in[i] ^ iv[i];
83	    CAMELLIA_encrypt(tmp, out, key);
84	    memcpy(iv, out, CAMELLIA_BLOCK_SIZE);
85	    size -= CAMELLIA_BLOCK_SIZE;
86	    in += CAMELLIA_BLOCK_SIZE;
87	    out += CAMELLIA_BLOCK_SIZE;
88	}
89	if (size) {
90	    for (i = 0; i < size; i++)
91		tmp[i] = in[i] ^ iv[i];
92	    for (i = size; i < CAMELLIA_BLOCK_SIZE; i++)
93		tmp[i] = iv[i];
94	    CAMELLIA_encrypt(tmp, out, key);
95	    memcpy(iv, out, CAMELLIA_BLOCK_SIZE);
96	}
97    } else {
98	while (size >= CAMELLIA_BLOCK_SIZE) {
99	    memcpy(tmp, in, CAMELLIA_BLOCK_SIZE);
100	    CAMELLIA_decrypt(tmp, out, key);
101	    for (i = 0; i < CAMELLIA_BLOCK_SIZE; i++)
102		out[i] ^= iv[i];
103	    memcpy(iv, tmp, CAMELLIA_BLOCK_SIZE);
104	    size -= CAMELLIA_BLOCK_SIZE;
105	    in += CAMELLIA_BLOCK_SIZE;
106	    out += CAMELLIA_BLOCK_SIZE;
107	}
108	if (size) {
109	    memcpy(tmp, in, CAMELLIA_BLOCK_SIZE);
110	    CAMELLIA_decrypt(tmp, out, key);
111	    for (i = 0; i < size; i++)
112		out[i] ^= iv[i];
113	    memcpy(iv, tmp, CAMELLIA_BLOCK_SIZE);
114	}
115    }
116}
117