aes.h

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#ifndef __AES_H__
#define __AES_H__

#include "common.h"

#define AES_BLOCK_SIZE 16

#define AES_KEY_SIZE 16

#define AES_KEY_SIZE_BITS 128

#define AES_OK 0                     // Success
#define AES_ERR_INVALID_PARAM 1      // NULL pointer or invalid parameter
#define AES_ERR_INVALID_LENGTH 2     // Invalid data length (not block-aligned or zero)
#define AES_ERR_CRYPTO_FAILURE 3     // Underlying crypto operation failed

typedef struct aes_ctx_t* aes_ctx;


aes_ctx aes_create_ctx(const unsigned char key[AES_KEY_SIZE]);


int aes_encrypt_block(
    aes_ctx ctx,
    const unsigned char plaintext[AES_BLOCK_SIZE],
    unsigned char ciphertext[AES_BLOCK_SIZE]
);


int aes_cbc_encrypt(
    aes_ctx ctx,
    const unsigned char * plaintext,
    size_t plaintext_len,
    unsigned char * ciphertext,
    const unsigned char iv[AES_BLOCK_SIZE]
);


int aes_cbc_decrypt(
    aes_ctx ctx,
    const unsigned char * ciphertext,
    size_t ciphertext_len,
    unsigned char * plaintext,
    const unsigned char iv[AES_BLOCK_SIZE]
);


int aes_cbc_mac(
    aes_ctx ctx,
    const unsigned char * plaintext,
    size_t plaintext_len,
    unsigned char mac[AES_BLOCK_SIZE]
);


void aes_destroy_ctx(aes_ctx ctx);


#endif  // __AES_H__