void aes_handle(uint8_t * key, uint8_t * text)
{
nrf_ecb_set_key(key);
bool is_successful = nrf_ecb_crypt(text, text);
ASSERT(is_successful);
(void)is_successful;
}
void gzp_crypt(uint8_t* dst, const uint8_t* src, uint8_t length)
{
uint8_t i;
uint8_t key[16];
uint8_t iv[16];
// Build AES key based on "gzp_key_select"
switch(gzp_key_select)
{
case GZP_ID_EXCHANGE:
memcpy(key, (void const*)gzp_secret_key, 16);
break;
case GZP_KEY_EXCHANGE:
memcpy(key, (void const*)gzp_secret_key, 16);
gzp_get_host_id(key);
break;
case GZP_DATA_EXCHANGE:
memcpy(key, (void const*)gzp_secret_key, 16);
memcpy(key, (void const*)gzp_dyn_key, GZP_DYN_KEY_LENGTH);
break;
default:
return;
}
// Build init vector from "gzp_session_token"
for(i = 0; i < 16; i++)
{
if(i < GZP_SESSION_TOKEN_LENGTH)
{
iv[i] = gzp_session_token[i];
}
else
{
iv[i] = 0;
}
}
// Set up hal_aes using new key and init vector
(void)nrf_ecb_init();
nrf_ecb_set_key(key);
//hal_aes_setup(false, ECB, key, NULL); // Note, here we skip the IV as we use ECB mode
// Encrypt IV using ECB mode
(void)nrf_ecb_crypt(iv, iv);
// Encrypt data by XOR'ing with AES output
gzp_xor_cipher(dst, src, iv, length);
}
