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/* libanode: the Anode C reference implementation
* Copyright (C) 2009 Adam Ierymenko <adam.ierymenko@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>. */
#ifndef _SPARK_WRAPPER_H
#define _SPARK_WRAPPER_H
#include <openssl/sha.h>
#include "../libanode/aes128.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Spark uses SHA-256 with hash length 32 */
#define SPARK_HASH_LENGTH 32
// Wrap a segment for forward propagation
static inline void Spark_wrap(void *data,unsigned long len,void *plaintext_hash_buf,void *global_hash_buf)
{
unsigned char expkey[ANODE_AES128_EXP_KEY_SIZE];
SHA256((const unsigned char *)data,len,(unsigned char *)plaintext_hash_buf);
Anode_aes128_expand_key(expkey,(const unsigned char *)plaintext_hash_buf);
Anode_aes128_cfb_encrypt(expkey,((const unsigned char *)plaintext_hash_buf) + 16,(unsigned char *)data,len);
SHA256((const unsigned char *)data,len,(unsigned char *)global_hash_buf);
}
// Unwrap a segment and check its integrity
static inline int Spark_unwrap(void *data,unsigned long len,const void *plaintext_hash)
{
unsigned char expkey[ANODE_AES128_EXP_KEY_SIZE];
unsigned char check_hash[32];
unsigned long i;
Anode_aes128_expand_key(expkey,(const unsigned char *)plaintext_hash);
Anode_aes128_cfb_decrypt(expkey,((const unsigned char *)plaintext_hash) + 16,(unsigned char *)data,len);
SHA256((const unsigned char *)data,len,check_hash);
for(i=0;i<32;++i) {
if (check_hash[i] != ((const unsigned char *)plaintext_hash)[i])
return 0;
}
return 1;
}
#ifdef __cplusplus
}
#endif
#endif
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