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