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using Gee;
using Gtk;
using Crypto;
using Dino.Entities;
using Xmpp;
using Signal;
namespace Dino.Plugins.Omemo {
public class OmemoHttpFileMeta : HttpFileMeta {
public uint8[] iv;
public uint8[] key;
}
public class OmemoFileEncryptor : Dino.FileEncryptor, Object {
public bool can_encrypt_file(Conversation conversation, FileTransfer file_transfer) {
return file_transfer.encryption == Encryption.OMEMO;
}
public FileMeta encrypt_file(Conversation conversation, FileTransfer file_transfer) throws FileSendError {
const uint KEY_SIZE = 32;
const uint IV_SIZE = 12;
var omemo_http_file_meta = new OmemoHttpFileMeta();
try {
//Create a key and use it to encrypt the file
uint8[] iv = new uint8[IV_SIZE];
Plugin.get_context().randomize(iv);
uint8[] key = new uint8[KEY_SIZE];
Plugin.get_context().randomize(key);
SymmetricCipher cipher = new SymmetricCipher("AES-GCM");
cipher.set_key(key);
cipher.set_iv(iv);
omemo_http_file_meta.iv = iv;
omemo_http_file_meta.key = key;
omemo_http_file_meta.size = file_transfer.size + 16;
omemo_http_file_meta.mime_type = "omemo";
file_transfer.input_stream = new ConverterInputStream(file_transfer.input_stream, new SymmetricCipherEncrypter((owned) cipher, 16));
} catch (Crypto.Error error) {
throw new FileSendError.ENCRYPTION_FAILED("OMEMO file encryption error: %s".printf(error.message));
} catch (GLib.Error error) {
throw new FileSendError.ENCRYPTION_FAILED("OMEMO file encryption error: %s".printf(error.message));
}
debug("Encrypting file %s as %s", file_transfer.file_name, file_transfer.server_file_name);
return omemo_http_file_meta;
}
public FileSendData? preprocess_send_file(Conversation conversation, FileTransfer file_transfer, FileSendData file_send_data, FileMeta file_meta) {
HttpFileSendData? send_data = file_send_data as HttpFileSendData;
if (send_data == null) return null;
OmemoHttpFileMeta? omemo_http_file_meta = file_meta as OmemoHttpFileMeta;
if (omemo_http_file_meta == null) return null;
// Convert iv and key to hex
string iv_and_key = "";
foreach (uint8 byte in omemo_http_file_meta.iv) iv_and_key += byte.to_string("%02x");
foreach (uint8 byte in omemo_http_file_meta.key) iv_and_key += byte.to_string("%02x");
string aesgcm_link = send_data.url_down + "#" + iv_and_key;
aesgcm_link = "aesgcm://" + aesgcm_link.substring(8); // replace https:// by aesgcm://
send_data.url_down = aesgcm_link;
send_data.encrypt_message = true;
return file_send_data;
}
}
}
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