#ifndef _AES_H_
#define _AES_H_

#include <stdint.h>
#include <stddef.h>

#ifndef CBC
#define CBC 1
#endif

#ifndef ECB
#define ECB 1
#endif

#ifndef CTR
#define CTR 1
#endif

#define AES128 1
//#define AES192 1
//#define AES256 1

#define AES_BLOCKLEN 16         // Block length in bytes - AES is 128b block only

#if defined(AES256) && (AES256 == 1)
#define AES_KEYLEN 32
#define AES_keyExpSize 240
#elif defined(AES192) && (AES192 == 1)
#define AES_KEYLEN 24
#define AES_keyExpSize 208
#else
#define AES_KEYLEN 16           // Key length in bytes
#define AES_keyExpSize 176
#endif

struct AES_ctx {
    uint8_t RoundKey[AES_keyExpSize];
#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
    uint8_t Iv[AES_BLOCKLEN];
#endif
};

void AES_init_ctx(struct AES_ctx *ctx, const uint8_t * key);
#if (defined(CBC) && (CBC == 1)) || (defined(CTR) && (CTR == 1))
void AES_init_ctx_iv(struct AES_ctx *ctx, const uint8_t * key, const uint8_t * iv);
void AES_ctx_set_iv(struct AES_ctx *ctx, const uint8_t * iv);
#endif

#if defined(ECB) && (ECB == 1)
void AES_ECB_encrypt(const struct AES_ctx *ctx, uint8_t * buf);
void AES_ECB_decrypt(const struct AES_ctx *ctx, uint8_t * buf);

#endif // #if defined(ECB) && (ECB == !)

#if defined(CBC) && (CBC == 1)
void AES_CBC_encrypt_buffer(struct AES_ctx *ctx, uint8_t * buf, size_t length);
void AES_CBC_decrypt_buffer(struct AES_ctx *ctx, uint8_t * buf, size_t length);

#endif // #if defined(CBC) && (CBC == 1)

#if defined(CTR) && (CTR == 1)

void AES_CTR_xcrypt_buffer(struct AES_ctx *ctx, uint8_t * buf, size_t length);

#endif // #if defined(CTR) && (CTR == 1)

#endif // _AES_H_