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/* Aes.h -- AES encryption / decryption
2008-08-05
Igor Pavlov
Public domain */
#ifndef __AES_H
#define __AES_H
#include "Types.h"
#define AES_BLOCK_SIZE 16
typedef struct
{
unsigned numRounds2; /* = numRounds / 2 */
UInt32 rkey[(14 + 1) * 4];
} CAes;
/* Call AesGenTables one time before other AES functions */
void AesGenTables(void);
/* keySize = 16 or 24 or 32 (bytes) */
void Aes_SetKeyEncode(CAes *p, const Byte *key, unsigned keySize);
void Aes_SetKeyDecode(CAes *p, const Byte *key, unsigned keySize);
/* Aes_Encode32 and Aes_Decode32 functions work with little-endian words.
src and dest are pointers to 4 UInt32 words.
arc and dest can point to same block */
void Aes_Encode32(const CAes *p, UInt32 *dest, const UInt32 *src);
void Aes_Decode32(const CAes *p, UInt32 *dest, const UInt32 *src);
typedef struct
{
UInt32 prev[4];
CAes aes;
} CAesCbc;
void AesCbc_Init(CAesCbc *p, const Byte *iv); /* iv size is AES_BLOCK_SIZE */
/* AesCbc_Encode and AesCbc_Decode:
if (res <= size): Filter have converted res bytes
if (res > size): Filter have not converted anything. And it needs at
least res = AES_BLOCK_SIZE bytes to convert one block */
SizeT AesCbc_Encode(CAesCbc *p, Byte *data, SizeT size);
SizeT AesCbc_Decode(CAesCbc *p, Byte *data, SizeT size);
#endif
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