s3:lib/events: s/EVENT_FD/TEVENT_FD
[Samba/gebeck_regimport.git] / lib / crypto / aes.c
bloba47a45659332a0c29e5348a5fb8e6777d433e82b
1 /*
2 * Copyright (c) 2003 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
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.
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.
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.
34 #include "replace.h"
36 #include "rijndael-alg-fst.h"
37 #include "aes.h"
39 int
40 AES_set_encrypt_key(const unsigned char *userkey, const int bits, AES_KEY *key)
42 key->rounds = rijndaelKeySetupEnc(key->key, userkey, bits);
43 if (key->rounds == 0)
44 return -1;
45 return 0;
48 int
49 AES_set_decrypt_key(const unsigned char *userkey, const int bits, AES_KEY *key)
51 key->rounds = rijndaelKeySetupDec(key->key, userkey, bits);
52 if (key->rounds == 0)
53 return -1;
54 return 0;
57 void
58 AES_encrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key)
60 rijndaelEncrypt(key->key, key->rounds, in, out);
63 void
64 AES_decrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key)
66 rijndaelDecrypt(key->key, key->rounds, in, out);
69 void
70 AES_cbc_encrypt(const unsigned char *in, unsigned char *out,
71 unsigned long size, const AES_KEY *key,
72 unsigned char *iv, int forward_encrypt)
74 unsigned char tmp[AES_BLOCK_SIZE];
75 int i;
77 if (forward_encrypt) {
78 while (size >= AES_BLOCK_SIZE) {
79 for (i = 0; i < AES_BLOCK_SIZE; i++)
80 tmp[i] = in[i] ^ iv[i];
81 AES_encrypt(tmp, out, key);
82 memcpy(iv, out, AES_BLOCK_SIZE);
83 size -= AES_BLOCK_SIZE;
84 in += AES_BLOCK_SIZE;
85 out += AES_BLOCK_SIZE;
87 if (size) {
88 for (i = 0; i < size; i++)
89 tmp[i] = in[i] ^ iv[i];
90 for (i = size; i < AES_BLOCK_SIZE; i++)
91 tmp[i] = iv[i];
92 AES_encrypt(tmp, out, key);
93 memcpy(iv, out, AES_BLOCK_SIZE);
95 } else {
96 while (size >= AES_BLOCK_SIZE) {
97 memcpy(tmp, in, AES_BLOCK_SIZE);
98 AES_decrypt(tmp, out, key);
99 for (i = 0; i < AES_BLOCK_SIZE; i++)
100 out[i] ^= iv[i];
101 memcpy(iv, tmp, AES_BLOCK_SIZE);
102 size -= AES_BLOCK_SIZE;
103 in += AES_BLOCK_SIZE;
104 out += AES_BLOCK_SIZE;
106 if (size) {
107 memcpy(tmp, in, AES_BLOCK_SIZE);
108 AES_decrypt(tmp, out, key);
109 for (i = 0; i < size; i++)
110 out[i] ^= iv[i];
111 memcpy(iv, tmp, AES_BLOCK_SIZE);
116 void aes_cfb8_encrypt(const uint8_t *in, uint8_t *out,
117 size_t length, const AES_KEY *key,
118 uint8_t *iv, int forward)
120 size_t i;
122 for (i=0; i < length; i++) {
123 uint8_t tiv[AES_BLOCK_SIZE*2];
125 memcpy(tiv, iv, AES_BLOCK_SIZE);
126 AES_encrypt(iv, iv, key);
127 if (!forward) {
128 tiv[AES_BLOCK_SIZE] = in[i];
130 out[i] = in[i] ^ iv[0];
131 if (forward) {
132 tiv[AES_BLOCK_SIZE] = out[i];
134 memcpy(iv, tiv+1, AES_BLOCK_SIZE);