seq_auth.h

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#ifndef __CWIST_CORE_SEQ_SEQ_AUTH_H__
#define __CWIST_CORE_SEQ_SEQ_AUTH_H__
 
#include <cwist/core/seq/seq.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#define CWIST_SEQ_AUTH_KEY_SIZE 32
#define CWIST_SEQ_AUTH_SESSION_ID_SIZE 16
#define CWIST_SEQ_AUTH_MESSAGE_ID_SIZE 16
#define CWIST_SEQ_AUTH_NONCE_SIZE 12
#define CWIST_SEQ_AUTH_TAG_SIZE 16
#define CWIST_SEQ_AUTH_HEADER_SIZE                                                        \
    (CWIST_SEQ_HEADER_SIZE + CWIST_SEQ_AUTH_MESSAGE_ID_SIZE + CWIST_SEQ_AUTH_NONCE_SIZE + \
     CWIST_SEQ_AUTH_TAG_SIZE)
 
typedef struct cwist_seq_auth_context cwist_seq_auth_context_t;
 
typedef struct cwist_seq_auth_metadata {
    uint8_t message_id[CWIST_SEQ_AUTH_MESSAGE_ID_SIZE];
    uint8_t nonce[CWIST_SEQ_AUTH_NONCE_SIZE];
} cwist_seq_auth_metadata_t;
 
cwist_seq_auth_context_t *
cwist_seq_auth_context_create(const uint8_t key[CWIST_SEQ_AUTH_KEY_SIZE],
                              const uint8_t session_id[CWIST_SEQ_AUTH_SESSION_ID_SIZE],
                              size_t replay_window);
void cwist_seq_auth_context_destroy(cwist_seq_auth_context_t *ctx);
 
bool cwist_seq_auth_random(uint8_t *out, size_t len);
 
bool cwist_seq_auth_wrap(const cwist_seq_auth_context_t *ctx,
                         const uint8_t message_id[CWIST_SEQ_AUTH_MESSAGE_ID_SIZE],
                         const uint8_t nonce[CWIST_SEQ_AUTH_NONCE_SIZE], const uint8_t *chunk,
                         size_t chunk_len, uint8_t **out, size_t *out_len);
 
bool cwist_seq_auth_unwrap(cwist_seq_auth_context_t *ctx, const uint8_t *data, size_t len,
                           cwist_seq_auth_metadata_t *metadata, cwist_seq_chunk_t *chunk);
 
void cwist_seq_auth_mark_complete(cwist_seq_auth_context_t *ctx,
                                  const uint8_t message_id[CWIST_SEQ_AUTH_MESSAGE_ID_SIZE]);
 
#ifdef __cplusplus
}
#endif
#endif