2 * Copyright (c) 2003 Markus Friedl. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 #if OPENSSL_VERSION_NUMBER < 0x00907000L
27 RCSID("$OpenBSD: cipher-aes.c,v 1.1 2003/05/15 03:08:29 markus Exp $");
29 #include <openssl/evp.h>
34 #define RIJNDAEL_BLOCKSIZE 16
35 struct ssh_rijndael_ctx
38 u_char r_iv[RIJNDAEL_BLOCKSIZE];
41 const EVP_CIPHER * evp_rijndael(void);
42 void ssh_rijndael_iv(EVP_CIPHER_CTX *, int, u_char *, u_int);
45 ssh_rijndael_init(EVP_CIPHER_CTX *ctx, const u_char *key, const u_char *iv,
48 struct ssh_rijndael_ctx *c;
50 if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) {
51 c = xmalloc(sizeof(*c));
52 EVP_CIPHER_CTX_set_app_data(ctx, c);
57 rijndael_set_key(&c->r_ctx, (u_char *)key,
58 8*EVP_CIPHER_CTX_key_length(ctx), enc);
61 memcpy(c->r_iv, iv, RIJNDAEL_BLOCKSIZE);
66 ssh_rijndael_cbc(EVP_CIPHER_CTX *ctx, u_char *dest, const u_char *src,
69 struct ssh_rijndael_ctx *c;
70 u_char buf[RIJNDAEL_BLOCKSIZE];
71 u_char *cprev, *cnow, *plain, *ivp;
72 int i, j, blocks = len / RIJNDAEL_BLOCKSIZE;
76 if (len % RIJNDAEL_BLOCKSIZE)
77 fatal("ssh_rijndael_cbc: bad len %d", len);
78 if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) == NULL) {
79 error("ssh_rijndael_cbc: no context");
84 plain = (u_char *)src;
86 for (i = 0; i < blocks; i++, plain+=RIJNDAEL_BLOCKSIZE,
87 cnow+=RIJNDAEL_BLOCKSIZE) {
88 for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++)
89 buf[j] = plain[j] ^ cprev[j];
90 rijndael_encrypt(&c->r_ctx, buf, cnow);
93 memcpy(c->r_iv, cprev, RIJNDAEL_BLOCKSIZE);
95 cnow = (u_char *) (src+len-RIJNDAEL_BLOCKSIZE);
96 plain = dest+len-RIJNDAEL_BLOCKSIZE;
98 memcpy(buf, cnow, RIJNDAEL_BLOCKSIZE);
99 for (i = blocks; i > 0; i--, cnow-=RIJNDAEL_BLOCKSIZE,
100 plain-=RIJNDAEL_BLOCKSIZE) {
101 rijndael_decrypt(&c->r_ctx, cnow, plain);
102 ivp = (i == 1) ? c->r_iv : cnow-RIJNDAEL_BLOCKSIZE;
103 for (j = 0; j < RIJNDAEL_BLOCKSIZE; j++)
106 memcpy(c->r_iv, buf, RIJNDAEL_BLOCKSIZE);
112 ssh_rijndael_cleanup(EVP_CIPHER_CTX *ctx)
114 struct ssh_rijndael_ctx *c;
116 if ((c = EVP_CIPHER_CTX_get_app_data(ctx)) != NULL) {
117 memset(c, 0, sizeof(*c));
119 EVP_CIPHER_CTX_set_app_data(ctx, NULL);
125 ssh_rijndael_iv(EVP_CIPHER_CTX *evp, int doset, u_char * iv, u_int len)
127 struct ssh_rijndael_ctx *c;
129 if ((c = EVP_CIPHER_CTX_get_app_data(evp)) == NULL)
130 fatal("ssh_rijndael_iv: no context");
132 memcpy(c->r_iv, iv, len);
134 memcpy(iv, c->r_iv, len);
140 static EVP_CIPHER rijndal_cbc;
142 memset(&rijndal_cbc, 0, sizeof(EVP_CIPHER));
143 rijndal_cbc.nid = NID_undef;
144 rijndal_cbc.block_size = RIJNDAEL_BLOCKSIZE;
145 rijndal_cbc.iv_len = RIJNDAEL_BLOCKSIZE;
146 rijndal_cbc.key_len = 16;
147 rijndal_cbc.init = ssh_rijndael_init;
148 rijndal_cbc.cleanup = ssh_rijndael_cleanup;
149 rijndal_cbc.do_cipher = ssh_rijndael_cbc;
151 rijndal_cbc.flags = EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH |
152 EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CUSTOM_IV;
154 return (&rijndal_cbc);