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Update: Full E2EE + Scripts

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This commit is contained in:
RuKira
2026-03-21 04:45:49 -04:00
parent cc31c4024a
commit 8a771220e4
21 changed files with 940 additions and 207 deletions
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50
RelayClient/Crypto/E2EeHelper.cs
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@@ -9,35 +9,33 @@ public static class E2EeHelper
{
using var rsa = RSA.Create(2048);
var publicKey = Convert.ToBase64String(rsa.ExportSubjectPublicKeyInfo());
var privateKey = Convert.ToBase64String(rsa.ExportPkcs8PrivateKey());
return (publicKey, privateKey);
return (
Convert.ToBase64String(rsa.ExportSubjectPublicKeyInfo()),
Convert.ToBase64String(rsa.ExportPkcs8PrivateKey())
);
}
public static EncryptedMessagePayload EncryptForRecipient(string plainText, string recipientPublicKeyBase64)
public static EncryptedPayload EncryptForRecipient(string plainText, string recipientPublicKeyBase64)
{
var aesKey = RandomNumberGenerator.GetBytes(32);
var nonce = RandomNumberGenerator.GetBytes(12);
var plainBytes = Encoding.UTF8.GetBytes(plainText);
var cipherBytes = new byte[plainBytes.Length];
var tag = new byte[16];
byte[] aesKey = RandomNumberGenerator.GetBytes(32);
byte[] nonce = RandomNumberGenerator.GetBytes(12);
byte[] plainBytes = Encoding.UTF8.GetBytes(plainText);
byte[] cipherBytes = new byte[plainBytes.Length];
byte[] tag = new byte[16];
using (var aes = new AesGcm(aesKey, 16))
{
aes.Encrypt(nonce, plainBytes, cipherBytes, tag);
}
var recipientPublicKey = Convert.FromBase64String(recipientPublicKeyBase64);
byte[] encryptedKey;
using (var rsa = RSA.Create())
{
rsa.ImportSubjectPublicKeyInfo(recipientPublicKey, out _);
rsa.ImportSubjectPublicKeyInfo(Convert.FromBase64String(recipientPublicKeyBase64), out _);
encryptedKey = rsa.Encrypt(aesKey, RSAEncryptionPadding.OaepSHA256);
}
return new EncryptedMessagePayload
return new EncryptedPayload
{
CipherText = Convert.ToBase64String(cipherBytes),
Nonce = Convert.ToBase64String(nonce),
@@ -46,34 +44,32 @@ public static class E2EeHelper
};
}
public static string DecryptForRecipient(EncryptedMessagePayload payload, string recipientPrivateKeyBase64)
public static string DecryptForRecipient(EncryptedPayload payload, string recipientPrivateKeyBase64)
{
var encryptedKey = Convert.FromBase64String(payload.EncryptedKey);
var privateKey = Convert.FromBase64String(recipientPrivateKeyBase64);
byte[] aesKey;
using (var rsa = RSA.Create())
{
rsa.ImportPkcs8PrivateKey(privateKey, out _);
aesKey = rsa.Decrypt(encryptedKey, RSAEncryptionPadding.OaepSHA256);
rsa.ImportPkcs8PrivateKey(Convert.FromBase64String(recipientPrivateKeyBase64), out _);
aesKey = rsa.Decrypt(Convert.FromBase64String(payload.EncryptedKey), RSAEncryptionPadding.OaepSHA256);
}
var nonce = Convert.FromBase64String(payload.Nonce);
var tag = Convert.FromBase64String(payload.Tag);
var cipherBytes = Convert.FromBase64String(payload.CipherText);
var plainBytes = new byte[cipherBytes.Length];
byte[] plainBytes = new byte[Convert.FromBase64String(payload.CipherText).Length];
using (var aes = new AesGcm(aesKey, 16))
{
aes.Decrypt(nonce, cipherBytes, tag, plainBytes);
aes.Decrypt(
Convert.FromBase64String(payload.Nonce),
Convert.FromBase64String(payload.CipherText),
Convert.FromBase64String(payload.Tag),
plainBytes
);
}
return Encoding.UTF8.GetString(plainBytes);
}
}
public class EncryptedMessagePayload
public class EncryptedPayload
{
public required string CipherText { get; set; }
public required string Nonce { get; set; }