diff options
Diffstat (limited to 'lib/crypto/aes.c')
| -rw-r--r-- | lib/crypto/aes.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/lib/crypto/aes.c b/lib/crypto/aes.c new file mode 100644 index 0000000000..7735e8ff37 --- /dev/null +++ b/lib/crypto/aes.c @@ -0,0 +1,114 @@ +/* + * Copyright (c) 2003 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "replace.h" + +#include "rijndael-alg-fst.h" +#include "aes.h" + +int +AES_set_encrypt_key(const unsigned char *userkey, const int bits, AES_KEY *key) +{ + key->rounds = rijndaelKeySetupEnc(key->key, userkey, bits); + if (key->rounds == 0) + return -1; + return 0; +} + +int +AES_set_decrypt_key(const unsigned char *userkey, const int bits, AES_KEY *key) +{ + key->rounds = rijndaelKeySetupDec(key->key, userkey, bits); + if (key->rounds == 0) + return -1; + return 0; +} + +void +AES_encrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key) +{ + rijndaelEncrypt(key->key, key->rounds, in, out); +} + +void +AES_decrypt(const unsigned char *in, unsigned char *out, const AES_KEY *key) +{ + rijndaelDecrypt(key->key, key->rounds, in, out); +} + +void +AES_cbc_encrypt(const unsigned char *in, unsigned char *out, + unsigned long size, const AES_KEY *key, + unsigned char *iv, int forward_encrypt) +{ + unsigned char tmp[AES_BLOCK_SIZE]; + int i; + + if (forward_encrypt) { + while (size >= AES_BLOCK_SIZE) { + for (i = 0; i < AES_BLOCK_SIZE; i++) + tmp[i] = in[i] ^ iv[i]; + AES_encrypt(tmp, out, key); + memcpy(iv, out, AES_BLOCK_SIZE); + size -= AES_BLOCK_SIZE; + in += AES_BLOCK_SIZE; + out += AES_BLOCK_SIZE; + } + if (size) { + for (i = 0; i < size; i++) + tmp[i] = in[i] ^ iv[i]; + for (i = size; i < AES_BLOCK_SIZE; i++) + tmp[i] = iv[i]; + AES_encrypt(tmp, out, key); + memcpy(iv, out, AES_BLOCK_SIZE); + } + } else { + while (size >= AES_BLOCK_SIZE) { + memcpy(tmp, in, AES_BLOCK_SIZE); + AES_decrypt(tmp, out, key); + for (i = 0; i < AES_BLOCK_SIZE; i++) + out[i] ^= iv[i]; + memcpy(iv, tmp, AES_BLOCK_SIZE); + size -= AES_BLOCK_SIZE; + in += AES_BLOCK_SIZE; + out += AES_BLOCK_SIZE; + } + if (size) { + memcpy(tmp, in, AES_BLOCK_SIZE); + AES_decrypt(tmp, out, key); + for (i = 0; i < size; i++) + out[i] ^= iv[i]; + memcpy(iv, tmp, AES_BLOCK_SIZE); + } + } +} |