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1 /* Aes.h -- AES encryption / decryption
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2 2008-08-05
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3 Igor Pavlov
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4 Public domain */
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5
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6 #ifndef __AES_H
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7 #define __AES_H
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8
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9 #include "Types.h"
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10
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11 #define AES_BLOCK_SIZE 16
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12
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13 typedef struct
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14 {
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15 unsigned numRounds2; /* = numRounds / 2 */
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16 UInt32 rkey[(14 + 1) * 4];
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17 } CAes;
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18
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19 /* Call AesGenTables one time before other AES functions */
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20 void AesGenTables(void);
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21
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22 /* keySize = 16 or 24 or 32 (bytes) */
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23 void Aes_SetKeyEncode(CAes *p, const Byte *key, unsigned keySize);
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24 void Aes_SetKeyDecode(CAes *p, const Byte *key, unsigned keySize);
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25
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26 /* Aes_Encode32 and Aes_Decode32 functions work with little-endian words.
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27 src and dest are pointers to 4 UInt32 words.
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28 arc and dest can point to same block */
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29 void Aes_Encode32(const CAes *p, UInt32 *dest, const UInt32 *src);
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30 void Aes_Decode32(const CAes *p, UInt32 *dest, const UInt32 *src);
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31
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32 typedef struct
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33 {
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34 UInt32 prev[4];
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35 CAes aes;
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36 } CAesCbc;
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37
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38 void AesCbc_Init(CAesCbc *p, const Byte *iv); /* iv size is AES_BLOCK_SIZE */
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39
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40 /* AesCbc_Encode and AesCbc_Decode:
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41 if (res <= size): Filter have converted res bytes
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42 if (res > size): Filter have not converted anything. And it needs at
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43 least res = AES_BLOCK_SIZE bytes to convert one block */
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44
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45 SizeT AesCbc_Encode(CAesCbc *p, Byte *data, SizeT size);
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46 SizeT AesCbc_Decode(CAesCbc *p, Byte *data, SizeT size);
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47
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48 #endif
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