1 /* crypto/seed/seed_cbc.c -*- mode:C; c-file-style: "eay" -*- */
2 /* ====================================================================
3 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
31 * 6. Redistributions of any form whatsoever must retain the following
33 * "This product includes software developed by the OpenSSL Project
34 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 * ====================================================================
52 #include "seed_locl.h"
55 void SEED_cbc_encrypt(const unsigned char *in, unsigned char *out,
56 size_t len, const SEED_KEY_SCHEDULE *ks,
57 unsigned char ivec[SEED_BLOCK_SIZE], int enc)
60 unsigned char tmp[SEED_BLOCK_SIZE];
61 const unsigned char *iv = ivec;
64 while (len >= SEED_BLOCK_SIZE) {
65 for (n = 0; n < SEED_BLOCK_SIZE; ++n)
66 out[n] = in[n] ^ iv[n];
67 SEED_encrypt(out, out, ks);
69 len -= SEED_BLOCK_SIZE;
70 in += SEED_BLOCK_SIZE;
71 out += SEED_BLOCK_SIZE;
74 for (n = 0; n < len; ++n)
75 out[n] = in[n] ^ iv[n];
76 for (n = len; n < SEED_BLOCK_SIZE; ++n)
78 SEED_encrypt(out, out, ks);
81 memcpy(ivec, iv, SEED_BLOCK_SIZE);
82 } else if (in != out) { /* decrypt */
83 while (len >= SEED_BLOCK_SIZE) {
84 SEED_decrypt(in, out, ks);
85 for (n = 0; n < SEED_BLOCK_SIZE; ++n)
88 len -= SEED_BLOCK_SIZE;
89 in += SEED_BLOCK_SIZE;
90 out += SEED_BLOCK_SIZE;
93 SEED_decrypt(in, tmp, ks);
94 for (n = 0; n < len; ++n)
95 out[n] = tmp[n] ^ iv[n];
98 memcpy(ivec, iv, SEED_BLOCK_SIZE);
99 } else { /* decrypt, overlap */
101 while (len >= SEED_BLOCK_SIZE) {
102 memcpy(tmp, in, SEED_BLOCK_SIZE);
103 SEED_decrypt(in, out, ks);
104 for (n = 0; n < SEED_BLOCK_SIZE; ++n)
106 memcpy(ivec, tmp, SEED_BLOCK_SIZE);
107 len -= SEED_BLOCK_SIZE;
108 in += SEED_BLOCK_SIZE;
109 out += SEED_BLOCK_SIZE;
112 memcpy(tmp, in, SEED_BLOCK_SIZE);
113 SEED_decrypt(tmp, tmp, ks);
114 for (n = 0; n < len; ++n)
115 out[n] = tmp[n] ^ ivec[n];
116 memcpy(ivec, tmp, SEED_BLOCK_SIZE);