421c33127bd574d638b3a47f53050bf7187170b3
[openssl.git] / crypto / camellia / cmll_cbc.c
1 /* crypto/camellia/camellia_cbc.c -*- mode:C; c-file-style: "eay" -*- */
2 /* ====================================================================
3  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  *
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer. 
11  *
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in
14  *    the documentation and/or other materials provided with the
15  *    distribution.
16  *
17  * 3. All advertising materials mentioning features or use of this
18  *    software must display the following acknowledgment:
19  *    "This product includes software developed by the OpenSSL Project
20  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
21  *
22  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
23  *    endorse or promote products derived from this software without
24  *    prior written permission. For written permission, please contact
25  *    openssl-core@openssl.org.
26  *
27  * 5. Products derived from this software may not be called "OpenSSL"
28  *    nor may "OpenSSL" appear in their names without prior written
29  *    permission of the OpenSSL Project.
30  *
31  * 6. Redistributions of any form whatsoever must retain the following
32  *    acknowledgment:
33  *    "This product includes software developed by the OpenSSL Project
34  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
35  *
36  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
37  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
39  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
42  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
43  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
44  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
45  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
46  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
47  * OF THE POSSIBILITY OF SUCH DAMAGE.
48  * ====================================================================
49  *
50  */
51
52 #ifndef CAMELLIA_DEBUG
53 # ifndef NDEBUG
54 #  define NDEBUG
55 # endif
56 #endif
57 #include <assert.h>
58 #include <string.h>
59
60 #include <openssl/camellia.h>
61 #include "cmll_locl.h"
62 void Camellia_cbc_encrypt(const unsigned char *in, unsigned char *out,
63         size_t len, const CAMELLIA_KEY *key,
64         unsigned char *ivec, const int enc) 
65         {
66
67         size_t n;
68         unsigned char tmp[CAMELLIA_BLOCK_SIZE];
69         const unsigned char *iv = ivec;
70
71         assert(in && out && key && ivec);
72         assert((CAMELLIA_ENCRYPT == enc)||(CAMELLIA_DECRYPT == enc));
73
74         if (CAMELLIA_ENCRYPT == enc) 
75                 {
76                 while (len >= CAMELLIA_BLOCK_SIZE) 
77                         {
78                         for(n=0; n < CAMELLIA_BLOCK_SIZE; ++n)
79                                 out[n] = in[n] ^ iv[n];
80                         Camellia_encrypt(out, out, key);
81                         iv = out;
82                         len -= CAMELLIA_BLOCK_SIZE;
83                         in += CAMELLIA_BLOCK_SIZE;
84                         out += CAMELLIA_BLOCK_SIZE;
85                         }
86                 if (len) 
87                         {
88                         for(n=0; n < len; ++n)
89                                 out[n] = in[n] ^ iv[n];
90                         for(n=len; n < CAMELLIA_BLOCK_SIZE; ++n)
91                                 out[n] = iv[n];
92                         Camellia_encrypt(out, out, key);
93                         iv = out;
94                         }
95                 memcpy(ivec,iv,CAMELLIA_BLOCK_SIZE);
96                 } 
97         else if (in != out) 
98                 {
99                 while (len >= CAMELLIA_BLOCK_SIZE) 
100                         {
101                         Camellia_decrypt(in, out, key);
102                         for(n=0; n < CAMELLIA_BLOCK_SIZE; ++n)
103                                 out[n] ^= iv[n];
104                         iv = in;
105                         len -= CAMELLIA_BLOCK_SIZE;
106                         in  += CAMELLIA_BLOCK_SIZE;
107                         out += CAMELLIA_BLOCK_SIZE;
108                         }
109                 if (len) 
110                         {
111                         Camellia_decrypt(in,tmp,key);
112                         for(n=0; n < len; ++n)
113                                 out[n] = tmp[n] ^ iv[n];
114                         iv = in;
115                         }
116                 memcpy(ivec,iv,CAMELLIA_BLOCK_SIZE);
117                 } 
118         else 
119                 {
120                 while (len >= CAMELLIA_BLOCK_SIZE) 
121                         {
122                         memcpy(tmp, in, CAMELLIA_BLOCK_SIZE);
123                         Camellia_decrypt(in, out, key);
124                         for(n=0; n < CAMELLIA_BLOCK_SIZE; ++n)
125                                 out[n] ^= ivec[n];
126                         memcpy(ivec, tmp, CAMELLIA_BLOCK_SIZE);
127                         len -= CAMELLIA_BLOCK_SIZE;
128                         in += CAMELLIA_BLOCK_SIZE;
129                         out += CAMELLIA_BLOCK_SIZE;
130                         }
131                 if (len)
132                         {
133                         memcpy(tmp, in, CAMELLIA_BLOCK_SIZE);
134                         Camellia_decrypt(tmp, out, key);
135                         for(n=0; n < len; ++n)
136                                 out[n] ^= ivec[n];
137                         for(n=len; n < CAMELLIA_BLOCK_SIZE; ++n)
138                                 out[n] = tmp[n];
139                         memcpy(ivec, tmp, CAMELLIA_BLOCK_SIZE);
140                         }
141                 }
142         }