private static async Task Main(string[] args)
{
Console.WriteLine("Compression Utility Nuget Library");
Console.WriteLine($"Version {typeof(ICompressionUtilityAsync).Assembly.GetName().Version} - Example CLI \n");
if (args.Length != 2)
{
goto error;
}
if (args[0] == "-c")
{
string compressed = await compressionUtility.Compress(args[1]);
Console.WriteLine("COMPRESSED STRING: " + compressed);
return;
}
if (args[0] == "-d")
{
string decompressed = await compressionUtility.Decompress(args[1]);
Console.WriteLine("DECOMPRESSED STRING: " + decompressed);
return;
}
error:
Console.WriteLine("INVALID ARGS. Correct usage: \nCompressing:\t-c \"String to compress here *@% 123\" \nDecompressing:\t-d \"H4sIAAAAAAAECgtxDQ4BALiT6u4EAAAA\" \n\n");
}
#pragma warning restore 1591
/// <summary>
/// Changes an Epistle <see cref="User"/>'s password.
/// </summary>
/// <param name="oldPw">The old <see cref="User"/> password (NOT its SHA512!).</param>
/// <param name="newPw">The new, better and safer password (NOT its SHA512!).</param>
/// <param name="totp">Request authentication token.</param>
/// <returns>Whether the password change request was successful or not.</returns>
/// <exception cref="ApplicationException">Thrown if the <see cref="User.PrivateKeyPem"/> is <c>null</c> or empty.</exception>
public async Task <bool> ChangePassword(string oldPw, string newPw, string totp)
{
if (oldPw == newPw)
{
return(false);
}
if (user.PrivateKeyPem.NullOrEmpty())
{
string msg = "The user's in-memory private key seems to be null or empty; can't change passwords without re-encrypting a new copy of the user key!";
logger?.LogError(msg);
throw new ApplicationException(msg);
}
var dto = new UserChangePasswordRequestDto
{
Totp = totp,
OldPwSHA512 = oldPw.SHA512(),
NewPwSHA512 = newPw.SHA512(),
NewPrivateKey = await keyExchange.EncryptAndCompressPrivateKeyAsync(user.PrivateKeyPem, newPw).ConfigureAwait(false)
};
var requestBody = new EpistleRequestBody
{
UserId = user.Id,
Auth = user.Token.Item2,
Body = await compressionUtility.Compress(JsonSerializer.Serialize(dto)).ConfigureAwait(false)
};
bool success = await userService.ChangeUserPassword(requestBody.Sign(crypto, user.PrivateKeyPem)).ConfigureAwait(false);
return(success);
}
/// <summary>
/// Asynchronous variant of <see cref="IKeyExchange.EncryptAndCompressPrivateKey"/>.
/// </summary>
/// <param name="privateKeyPem">The user's private RSA key (PEM-formatted <c>string</c>).</param>
/// <param name="userPassword">The user's password (NOT its SHA512!).</param>
/// <returns><c>string</c> that contains the encrypted and compressed <paramref name="privateKeyPem"/>.</returns>
public async Task <string> EncryptAndCompressPrivateKeyAsync(string privateKeyPem, string userPassword)
{
string encryptedKey = await aes.EncryptWithPasswordAsync(privateKeyPem, userPassword).ConfigureAwait(false);
return(await compressionUtilityAsync.Compress(encryptedKey).ConfigureAwait(false));
}
/// <summary>
/// Submits a message to a <see cref="Convo"/>.
/// </summary>
/// <param name="convo">The <see cref="Convo"/> to post the message into.</param>
/// <param name="messageType">The type of message (e.g. "TEXT=UTF8", "FILE=example.png", etc...).</param>
/// <param name="message">The message body to encrypt and post.</param>
/// <returns>Whether the message could be submitted successfully or not.</returns>
private async Task <bool> PostMessageToConvo(Convo convo, string messageType, byte[] message)
{
if (message.NullOrEmpty())
{
return(false);
}
Task <IDictionary <string, string> > publicKeys = userService.GetUserPublicKeys(user.Id, convo.GetParticipantIdsCommaSeparated(), user.Token.Item2);
byte[] compressedMessage = await compressionUtility.Compress(message, CompressionSettings.Default).ConfigureAwait(false);
using var encryptionResult = await aes.EncryptAsync(compressedMessage).ConfigureAwait(false);
byte[] key = new byte[48];
for (int i = 0; i < 32; i++)
{
key[i] = encryptionResult.Key[i];
}
for (int i = 0; i < 16; i++)
{
key[i + 32] = encryptionResult.IV[i];
}
// Encrypt the message decryption key for every convo participant individually.
var encryptedKeys = new ConcurrentBag <string>();
Parallel.ForEach(await publicKeys.ConfigureAwait(false), kvp =>
{
(string userId, string userPublicKey) = kvp;
if (userId.NotNullNotEmpty() && userPublicKey.NotNullNotEmpty())
{
string decompressedPublicKey = keyExchange.DecompressPublicKey(userPublicKey);
encryptedKeys.Add(userId + ':' + Convert.ToBase64String(rsa.Encrypt(key, decompressedPublicKey)));
}
});
try
{
var postParamsDto = new PostMessageParamsDto
{
Type = messageType,
SenderName = userSettings.Username,
ConvoId = convo.Id,
ConvoPasswordSHA512 = convoPasswordProvider.GetPasswordSHA512(convo.Id),
EncryptedKeys = encryptedKeys.ToCommaSeparatedString(),
EncryptedBody = Convert.ToBase64String(encryptionResult.EncryptedData)
};
var body = new EpistleRequestBody
{
UserId = user.Id,
Auth = user.Token.Item2,
Body = JsonSerializer.Serialize(postParamsDto)
};
return(await convoService.PostMessage(body.Sign(rsa, user.PrivateKeyPem)).ConfigureAwait(false));
}
catch
{
return(false);
}
}
