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#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include "cipher.h"
#include "lilliput-ae.h"
static void _process_associated_data(
const uint8_t key[KEY_BYTES],
size_t A_len,
const uint8_t A[A_len],
uint8_t Auth[BLOCK_BYTES]
)
{
}
static void _generate_tag(
const uint8_t key[KEY_BYTES],
size_t M_len,
const uint8_t M[M_len],
const uint8_t N[NONCE_BYTES],
const uint8_t Auth[BLOCK_BYTES],
uint8_t tag[TAG_BYTES]
)
{
}
static void _encrypt_message(
const uint8_t key[KEY_BYTES],
size_t M_len,
const uint8_t M[M_len],
const uint8_t N[NONCE_BYTES],
const uint8_t tag[TAG_BYTES],
uint8_t C[M_len]
)
{
}
static void _decrypt_message(
const uint8_t key[KEY_BYTES],
size_t C_len,
const uint8_t C[C_len],
const uint8_t N[NONCE_BYTES],
const uint8_t tag[TAG_BYTES],
uint8_t M[C_len]
)
{
}
void lilliput_ae_encrypt(
size_t message_len,
const uint8_t message[message_len],
size_t auth_data_len,
const uint8_t auth_data[auth_data_len],
const uint8_t key[KEY_BYTES],
const uint8_t nonce[NONCE_BYTES],
uint8_t ciphertext[message_len],
uint8_t tag[TAG_BYTES]
)
{
uint8_t auth[BLOCK_BYTES];
_process_associated_data(key, auth_data_len, auth_data, auth);
_generate_tag(key, message_len, message, nonce, auth, tag);
_encrypt_message(key, message_len, message, nonce, tag, ciphertext);
}
bool lilliput_ae_decrypt(
size_t ciphertext_len,
const uint8_t ciphertext[ciphertext_len],
size_t auth_data_len,
const uint8_t auth_data[auth_data_len],
const uint8_t key[KEY_BYTES],
const uint8_t nonce[NONCE_BYTES],
const uint8_t tag[TAG_BYTES],
uint8_t message[ciphertext_len]
)
{
_decrypt_message(key, ciphertext_len, ciphertext, nonce, tag, message);
uint8_t auth[BLOCK_BYTES];
_process_associated_data(key, auth_data_len, auth_data, auth);
uint8_t effective_tag[TAG_BYTES];
_generate_tag(key, ciphertext_len, message, nonce, auth, effective_tag);
return memcmp(tag, effective_tag, TAG_BYTES) == 0;
}
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