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Tyrrrz
2026-02-27 14:14:43 +02:00
parent eef0fc742d
commit f0e9d3be1b
2 changed files with 100 additions and 90 deletions
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100
DiscordChatExporter.Gui/Services/SettingsService.TokenEncryptionConverter.cs Normal file
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using System;
using System.Security.Cryptography;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;
using DiscordChatExporter.Gui.Utils.Extensions;
namespace DiscordChatExporter.Gui.Services;
public partial class SettingsService
{
private class TokenEncryptionConverter : JsonConverter<string?>
{
private const string Prefix = "enc:";
private static readonly Lazy<byte[]> Key = new(() =>
Rfc2898DeriveBytes.Pbkdf2(
Encoding.UTF8.GetBytes(Environment.TryGetMachineId() ?? string.Empty),
Encoding.UTF8.GetBytes(ThisAssembly.Project.EncryptionSalt),
iterations: 10_000,
HashAlgorithmName.SHA256,
outputLength: 16
)
);
public override string? Read(
ref Utf8JsonReader reader,
Type typeToConvert,
JsonSerializerOptions options
)
{
var value = reader.GetString();
// No prefix means the token is stored as plain text, which was
// the case for older versions of the application.
// Load it as is and encrypt it on next save.
if (
string.IsNullOrWhiteSpace(value)
|| !value.StartsWith(Prefix, StringComparison.Ordinal)
)
return value;
try
{
var data = Convert.FromHexString(value[Prefix.Length..]);
// Layout: nonce (12 bytes) | paddingLength (1 byte) | tag (16 bytes) | cipher
var nonce = data.AsSpan(0, 12);
var paddingLength = data[12];
var tag = data.AsSpan(13, 16);
var cipher = data.AsSpan(29);
var decrypted = new byte[cipher.Length];
using var aes = new AesGcm(Key.Value, 16);
aes.Decrypt(nonce, cipher, tag, decrypted);
return Encoding.UTF8.GetString(decrypted.AsSpan(paddingLength));
}
catch (Exception ex)
when (ex
is FormatException
or CryptographicException
or ArgumentException
or IndexOutOfRangeException
)
{
return null;
}
}
public override void Write(
Utf8JsonWriter writer,
string? value,
JsonSerializerOptions options
)
{
if (string.IsNullOrWhiteSpace(value))
{
writer.WriteNullValue();
return;
}
var paddingLength = RandomNumberGenerator.GetInt32(1, 17);
var tokenData = Encoding.UTF8.GetBytes(value);
// Layout: nonce (12 bytes) | paddingLength (1 byte) | tag (16 bytes) | cipher (paddingLength + tokenData.Length)
var data = new byte[29 + paddingLength + tokenData.Length];
RandomNumberGenerator.Fill(data.AsSpan(0, 12)); // nonce
data[12] = (byte)paddingLength;
var cipherSource = data.AsSpan(29);
RandomNumberGenerator.Fill(cipherSource[..paddingLength]); // random padding
tokenData.CopyTo(cipherSource[paddingLength..]); // token
using var aes = new AesGcm(Key.Value, 16);
aes.Encrypt(data.AsSpan(0, 12), cipherSource, cipherSource, data.AsSpan(13, 16));
writer.WriteStringValue(Prefix + Convert.ToHexStringLower(data));
}
}
}

90
DiscordChatExporter.Gui/Services/TokenEncryptionConverter.cs
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@@ -1,90 +0,0 @@
using System;
using System.Security.Cryptography;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;
using DiscordChatExporter.Gui.Utils.Extensions;
namespace DiscordChatExporter.Gui.Services;
internal class TokenEncryptionConverter : JsonConverter<string?>
{
private const string Prefix = "enc:";
private static readonly Lazy<byte[]> Key = new(() =>
Rfc2898DeriveBytes.Pbkdf2(
Encoding.UTF8.GetBytes(Environment.TryGetMachineId() ?? string.Empty),
Encoding.UTF8.GetBytes(ThisAssembly.Project.EncryptionSalt),
iterations: 10_000,
HashAlgorithmName.SHA256,
outputLength: 16
)
);
public override string? Read(
ref Utf8JsonReader reader,
Type typeToConvert,
JsonSerializerOptions options
)
{
var value = reader.GetString();
// No prefix means the token is stored as plain text, which was
// the case for older versions of the application.
// Load it as is and encrypt it on next save.
if (string.IsNullOrWhiteSpace(value) || !value.StartsWith(Prefix, StringComparison.Ordinal))
return value;
try
{
var data = Convert.FromHexString(value[Prefix.Length..]);
// Layout: nonce (12 bytes) | paddingLength (1 byte) | tag (16 bytes) | cipher
var nonce = data.AsSpan(0, 12);
var paddingLength = data[12];
var tag = data.AsSpan(13, 16);
var cipher = data.AsSpan(29);
var decrypted = new byte[cipher.Length];
using var aes = new AesGcm(Key.Value, 16);
aes.Decrypt(nonce, cipher, tag, decrypted);
return Encoding.UTF8.GetString(decrypted.AsSpan(paddingLength));
}
catch (Exception ex)
when (ex
is FormatException
or CryptographicException
or ArgumentException
or IndexOutOfRangeException
)
{
return null;
}
}
public override void Write(Utf8JsonWriter writer, string? value, JsonSerializerOptions options)
{
if (string.IsNullOrWhiteSpace(value))
{
writer.WriteNullValue();
return;
}
var paddingLength = RandomNumberGenerator.GetInt32(1, 17);
var tokenData = Encoding.UTF8.GetBytes(value);
// Layout: nonce (12 bytes) | paddingLength (1 byte) | tag (16 bytes) | cipher (paddingLength + tokenData.Length)
var data = new byte[29 + paddingLength + tokenData.Length];
RandomNumberGenerator.Fill(data.AsSpan(0, 12)); // nonce
data[12] = (byte)paddingLength;
var cipherSource = data.AsSpan(29);
RandomNumberGenerator.Fill(cipherSource[..paddingLength]); // random padding
tokenData.CopyTo(cipherSource[paddingLength..]); // token
using var aes = new AesGcm(Key.Value, 16);
aes.Encrypt(data.AsSpan(0, 12), cipherSource, cipherSource, data.AsSpan(13, 16));
writer.WriteStringValue(Prefix + Convert.ToHexStringLower(data));
}
}