/**
* mega_aes_ctr_encryptor_set_key:
* @aes_ctr_encryptor: a #MegaAesCtrEncryptor
* @key: a #MegaFileKey that will be used for encryption/decryption.
*
* Set file key that will be used for encryption/decryption.
*/
void mega_aes_ctr_encryptor_set_key(MegaAesCtrEncryptor* aes_ctr_encryptor, MegaFileKey* key)
{
g_return_if_fail(MEGA_IS_AES_CTR_ENCRYPTOR(aes_ctr_encryptor));
g_return_if_fail(MEGA_IS_FILE_KEY(key));
g_clear_object(&aes_ctr_encryptor->priv->key);
aes_ctr_encryptor->priv->key = g_object_ref(key);
}
/**
* mega_aes_ctr_encryptor_set_mac:
* @aes_ctr_encryptor: a #MegaAesCtrEncryptor
* @mac: a #MegaChunkedCbcMac calculator
*
* Add calculator for mac's.
*/
void mega_aes_ctr_encryptor_set_mac(MegaAesCtrEncryptor* aes_ctr_encryptor, MegaChunkedCbcMac* mac, MegaAesCtrEncryptorDirection dir)
{
MegaAesCtrEncryptorPrivate* priv;
guchar mac_iv[16];
g_return_if_fail(MEGA_IS_AES_CTR_ENCRYPTOR(aes_ctr_encryptor));
g_return_if_fail(MEGA_IS_CHUNKED_CBC_MAC(mac));
g_return_if_fail(aes_ctr_encryptor->priv->key != NULL);
priv = aes_ctr_encryptor->priv;
priv->direction = dir;
g_clear_object(&priv->mac);
priv->mac = g_object_ref(mac);
// mac iv is nonce + nonce
mega_file_key_get_nonce(priv->key, mac_iv);
mega_file_key_get_nonce(priv->key, mac_iv + 8);
mega_chunked_cbc_mac_setup(mac, MEGA_AES_KEY(priv->key), mac_iv);
}
/**
* mega_aes_ctr_encryptor_set_position:
* @aes_ctr_encryptor: a #MegaAesCtrEncryptor
* @position: Starting position for encryption/decryption.
*
* When decrypting the stream, decryptor needs to know position within the file
* that we are starting from, so that AES-CTR counter is set correctly.
*/
void mega_aes_ctr_encryptor_set_position(MegaAesCtrEncryptor* aes_ctr_encryptor, guint64 position)
{
g_return_if_fail(MEGA_IS_AES_CTR_ENCRYPTOR(aes_ctr_encryptor));
aes_ctr_encryptor->priv->position = position;
}
