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