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49 lines
1.3 KiB
C
Executable File
49 lines
1.3 KiB
C
Executable File
/* Aes.h -- AES encryption / decryption
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2008-03-26
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Igor Pavlov
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Public domain */
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#ifndef __AES_H
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#define __AES_H
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#include "Types.h"
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#define AES_BLOCK_SIZE 16
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typedef struct
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{
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unsigned numRounds2; /* = numRounds / 2 */
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UInt32 rkey[(14 + 1) * 4];
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} CAes;
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/* Call AesGenTables one time before other AES functions */
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void AesGenTables(void);
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/* keySize = 16 or 24 or 32 (bytes) */
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void Aes_SetKeyEncode(CAes *p, const Byte *key, unsigned keySize);
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void Aes_SetKeyDecode(CAes *p, const Byte *key, unsigned keySize);
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/* Aes_Encode32 and Aes_Decode32 functions work with little-endian words.
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src and dest are pointers to 4 UInt32 words.
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arc and dest can point to same block */
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void Aes_Encode32(const CAes *p, UInt32 *dest, const UInt32 *src);
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void Aes_Decode32(const CAes *p, UInt32 *dest, const UInt32 *src);
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typedef struct
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{
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UInt32 prev[4];
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CAes aes;
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} CAesCbc;
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void AesCbc_Init(CAesCbc *p, const Byte *iv); /* iv size is AES_BLOCK_SIZE */
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/* AesCbc_Encode and AesCbc_Decode:
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if (res <= size): Filter have converted res bytes
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if (res > size): Filter have not converted anything. And it needs at
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least res = AES_BLOCK_SIZE bytes to convert one block */
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SizeT AesCbc_Encode(CAesCbc *p, Byte *data, SizeT size);
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SizeT AesCbc_Decode(CAesCbc *p, Byte *data, SizeT size);
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#endif
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