1 /* $NetBSD: camellia.c,v 1.1.1.1 2011/04/13 18:14:49 elric Exp $ */ 2 3 /* 4 * Copyright (c) 2007 Kungliga Tekniska Högskolan 5 * (Royal Institute of Technology, Stockholm, Sweden). 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * 3. Neither the name of the Institute nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include "config.h" 37 38 #ifdef KRB5 39 #include <krb5/krb5-types.h> 40 #endif 41 42 #include <string.h> 43 44 #include "camellia-ntt.h" 45 #include "camellia.h" 46 47 #include <krb5/roken.h> 48 49 int 50 CAMELLIA_set_key(const unsigned char *userkey, 51 const int bits, CAMELLIA_KEY *key) 52 { 53 key->bits = bits; 54 Camellia_Ekeygen(bits, userkey, key->key); 55 return 1; 56 } 57 58 void 59 CAMELLIA_encrypt(const unsigned char *in, unsigned char *out, 60 const CAMELLIA_KEY *key) 61 { 62 Camellia_EncryptBlock(key->bits, in, key->key, out); 63 64 } 65 66 void 67 CAMELLIA_decrypt(const unsigned char *in, unsigned char *out, 68 const CAMELLIA_KEY *key) 69 { 70 Camellia_DecryptBlock(key->bits, in, key->key, out); 71 } 72 73 void 74 CAMELLIA_cbc_encrypt(const unsigned char *in, unsigned char *out, 75 unsigned long size, const CAMELLIA_KEY *key, 76 unsigned char *iv, int mode_encrypt) 77 { 78 unsigned char tmp[CAMELLIA_BLOCK_SIZE]; 79 int i; 80 81 if (mode_encrypt) { 82 while (size >= CAMELLIA_BLOCK_SIZE) { 83 for (i = 0; i < CAMELLIA_BLOCK_SIZE; i++) 84 tmp[i] = in[i] ^ iv[i]; 85 CAMELLIA_encrypt(tmp, out, key); 86 memcpy(iv, out, CAMELLIA_BLOCK_SIZE); 87 size -= CAMELLIA_BLOCK_SIZE; 88 in += CAMELLIA_BLOCK_SIZE; 89 out += CAMELLIA_BLOCK_SIZE; 90 } 91 if (size) { 92 for (i = 0; i < size; i++) 93 tmp[i] = in[i] ^ iv[i]; 94 for (i = size; i < CAMELLIA_BLOCK_SIZE; i++) 95 tmp[i] = iv[i]; 96 CAMELLIA_encrypt(tmp, out, key); 97 memcpy(iv, out, CAMELLIA_BLOCK_SIZE); 98 } 99 } else { 100 while (size >= CAMELLIA_BLOCK_SIZE) { 101 memcpy(tmp, in, CAMELLIA_BLOCK_SIZE); 102 CAMELLIA_decrypt(tmp, out, key); 103 for (i = 0; i < CAMELLIA_BLOCK_SIZE; i++) 104 out[i] ^= iv[i]; 105 memcpy(iv, tmp, CAMELLIA_BLOCK_SIZE); 106 size -= CAMELLIA_BLOCK_SIZE; 107 in += CAMELLIA_BLOCK_SIZE; 108 out += CAMELLIA_BLOCK_SIZE; 109 } 110 if (size) { 111 memcpy(tmp, in, CAMELLIA_BLOCK_SIZE); 112 CAMELLIA_decrypt(tmp, out, key); 113 for (i = 0; i < size; i++) 114 out[i] ^= iv[i]; 115 memcpy(iv, tmp, CAMELLIA_BLOCK_SIZE); 116 } 117 } 118 } 119