void bluesky_crypt_block_encrypt(gchar *cloud_block, size_t len,
BlueSkyCryptKeys *keys);
gboolean bluesky_crypt_block_decrypt(gchar *cloud_block, size_t len,
void bluesky_crypt_block_encrypt(gchar *cloud_block, size_t len,
BlueSkyCryptKeys *keys);
gboolean bluesky_crypt_block_decrypt(gchar *cloud_block, size_t len,