aessw.h

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/* Copyright 2019 Wirepas Ltd. All Rights Reserved.
 *
 * See file LICENSE.txt for full license details.
 *
 */
 
#ifndef AESSW_H_
#define AESSW_H_
 
#include <stdint.h>
 
#define AES_128_KEY_BLOCK_SIZE 16
 
typedef union
{
    uint32_t words[4];
    uint8_t bytes[16];
} aes_128_t;
 
typedef struct
{
    uint32_t key[4];         // Secret AES-128 key
    union
    {
        uint32_t iv_ctr[4];  // Nonce and counter combined
        uint32_t aes_in[4];  // Alias for AES input (if not iv_ctr)
    };
    uint32_t aes_out[4];     // AES-128 ECB output of last block
} aes_data_stream_t;
 
typedef struct
{
    aes_data_stream_t data; // OMAC1 AES-128 state
    aes_128_t hl1;          // Derived subkey HL1 (for non-padded last block)
    aes_128_t hl2;          // Derived subkey HL2 (for padded last block)
} aes_omac1_state_t;
 
void aes_setupStream(aes_data_stream_t * stream_ptr,
                     const uint8_t * key128_ptr,
                     const uint8_t * iv_ctr_ptr);
 
void aes_initOmac1(aes_omac1_state_t * state_ptr, const uint8_t * mic_key_ptr);
 
void aes_omac1(aes_omac1_state_t * state,
               uint8_t * mic_out_ptr,
               uint_fast8_t mic_out_bytes,
               const uint8_t * intext_ptr,
               size_t intext_bytes);
 
void aes_crypto128Ctr(aes_data_stream_t * stream_ptr,
                      const uint8_t * intext_ptr,
                      uint8_t * outtext_ptr,
                      size_t bytecount);
 
#endif /* AESSW_H_ */