private Cipher GetDecryptFn(CipherV1 cipher)
{
return(data => {
var arr = data.Split('_');
return cipher.Process(false, arr[0], arr[1]);
});
}
public IList <BaseEntry> Load(Stream stream, string password)
{
var json = new JsonConvert();
var reader = new StreamReader(stream);
var backup = json.Deserialize <DeserializedBackup>(reader.ReadToEnd());
if (!PFP_APPLICATION.Equals(backup.application))
{
throw new ReaderException($"Unsupported application {backup.application}");
}
if (!(backup.format == 2 || backup.format == 3))
{
throw new ReaderException($"Unsupported format version {backup.format}");
}
if (!(backup.data.ContainsKey(SALT_KEY) || backup.data.ContainsKey(HMAC_KEY)))
{
throw new ReaderException($"Invalid format");
}
string str;
var hasher = new HasherV2(password);
var cipher = new CipherV1(hasher.Hash, backup.data[SALT_KEY]);
var decrypt = GetDecryptFn(cipher);
try {
str = decrypt(backup.data[HMAC_KEY]);
} catch (InvalidCipherTextException e) {
if (e.Message.Equals(MAC_MESSAGE))
{
throw new ReaderException("Wrong master password");
}
else
{
throw;
}
}
backup.data.Remove(SALT_KEY);
backup.data.Remove(HMAC_KEY);
var result = new List <BaseEntry>();
foreach (var item in backup.data)
{
if (!item.Key.StartsWith(STORAGE_PREFIX))
{
continue;
}
str = decrypt(item.Value);
result.Add(json.Deserialize <BaseEntry>(str));
}
return(result);
}
private Cipher GetEncryptFn(CipherV1 cipher)
{
return(data => {
var iv = Util.GenerateRandom(IV_LENGTH);
var str = cipher.Process(true, iv, data);
return iv + "_" + str;
});
}
public void Save(Stream stream, string password, IList <BaseEntry> entries)
{
var backup = new DeserializedBackup {
application = PFP_APPLICATION,
format = 2,
data = new Dictionary <string, string>()
};
entries = Util.GenerateSiteEntries(entries);
var salt = Util.GenerateRandom(SALT_LENGTH);
var hmac = Util.GenerateRandom(HMAC_LENGTH);
var json = new JsonConvert();
var hasher = new HasherV2(password);
var digest = new DigesterV1(hmac);
var cipher = new CipherV1(hasher.Hash, salt);
var encrypt = GetEncryptFn(cipher);
backup.data.Add(SALT_KEY, salt);
backup.data.Add(HMAC_KEY, encrypt(json.Serialize(hmac)));
foreach (var entry in entries)
{
var data = encrypt(json.Serialize(entry));
var key = STORAGE_PREFIX + digest.Digest(entry.site);
if (entry is PassEntry pass)
{
key += ":" + digest.Digest(pass.site + "\0" + pass.name + "\0" + pass.revision);
}
backup.data.Add(key, data);
}
var writer = new StreamWriter(stream);
var str = json.Serialize(backup);
writer.Write(str);
writer.Flush();
}
static Crypto()
{
_dbHttpV1 = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 };
cipherHTTPV1 = new CipherV1(_dbHttpV1);
}
