Mercurial > vba-linux

     1 /* Aes.h -- AES encryption / decryption

     2 2008-08-05

     3 Igor Pavlov

     4 Public domain */

     5 

     6 #ifndef __AES_H

     7 #define __AES_H

     8 

     9 #include "Types.h"

    10 

    11 #define AES_BLOCK_SIZE 16

    12 

    13 typedef struct

    14 {

    15   unsigned numRounds2; /* = numRounds / 2 */

    16   UInt32 rkey[(14 + 1) * 4];

    17 } CAes;

    18 

    19 /* Call AesGenTables one time before other AES functions */

    20 void AesGenTables(void);

    21 

    22 /* keySize = 16 or 24 or 32 (bytes) */

    23 void Aes_SetKeyEncode(CAes *p, const Byte *key, unsigned keySize);

    24 void Aes_SetKeyDecode(CAes *p, const Byte *key, unsigned keySize);

    25 

    26 /* Aes_Encode32 and Aes_Decode32 functions work with little-endian words.

    27   src and dest are pointers to 4 UInt32 words.

    28   arc and dest can point to same block */

    29 void Aes_Encode32(const CAes *p, UInt32 *dest, const UInt32 *src);

    30 void Aes_Decode32(const CAes *p, UInt32 *dest, const UInt32 *src);

    31 

    32 typedef struct

    33 {

    34   UInt32 prev[4];

    35   CAes aes;

    36 } CAesCbc;

    37 

    38 void AesCbc_Init(CAesCbc *p, const Byte *iv); /* iv size is AES_BLOCK_SIZE */

    39 

    40 /* AesCbc_Encode and AesCbc_Decode:

    41   if (res <= size): Filter have converted res bytes

    42   if (res > size):  Filter have not converted anything. And it needs at

    43                     least res = AES_BLOCK_SIZE bytes to convert one block */

    44 

    45 SizeT AesCbc_Encode(CAesCbc *p, Byte *data, SizeT size);

    46 SizeT AesCbc_Decode(CAesCbc *p, Byte *data, SizeT size);

    47 

    48 #endif
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 03 Mar 2012 10:31:27 -0600
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