public EncryptedMessage Encrypt(byte[] input)
{
var em = new EncryptedMessage();
using (var aes = new AesManaged())
{
aes.KeySize = 256;
aes.GenerateIV();
aes.GenerateKey();
em.IV = aes.IV;
em.Key = aes.Key;
em.EncryptionType = MessageEncryptionType.Aes;
using (var encryptor = aes.CreateEncryptor())
{
using (var msOutput = new MemoryStream())
{
using (var cryptoStream = new CryptoStream(msOutput, encryptor, CryptoStreamMode.Write)) {
using (var msInput = new MemoryStream(input)) {
msInput.CopyTo(cryptoStream);
}
}
em.CipherBytes = msOutput.ToArray();
}
}
return(em);
}
}
public static EncryptedMessage FromStream(Stream stream)
{
var em = new EncryptedMessage();
byte[] header = new byte[_headerSize];
stream.Read(header, 0, _headerSize);
MessageEncryptionType encryptionType = (MessageEncryptionType)header[0];
KeyEncryptionType keyType = (KeyEncryptionType)header[1];
int keySize = ByteLengthFromPoSize(header[2]);
int ivSize = header[3];
// read dataSize from header using a offset of 2
ushort dataSize = BitConverter.ToUInt16(header, 4);
byte[] iv = new byte[ivSize];
stream.Read(iv, 0, ivSize);
byte[] key = new byte[keySize];
stream.Read(key, 0, keySize);
byte[] data = new byte[dataSize];
stream.Read(data, 0, dataSize);
em.IV = iv;
em.Key = key;
em.CipherBytes = data;
em.KeyType = keyType;
em.EncryptionType = encryptionType;
return(em);
}
public EncryptedMessage Encrypt(byte[] input)
{
var em = new EncryptedMessage();
using (var aes = new AesManaged())
{
aes.KeySize = 256;
aes.GenerateIV();
aes.GenerateKey();
em.IV = aes.IV;
em.Key = aes.Key;
em.EncryptionType = MessageEncryptionType.Aes;
using (var encryptor = aes.CreateEncryptor())
{
using (var msOutput = new MemoryStream())
{
using (var cryptoStream = new CryptoStream(msOutput, encryptor, CryptoStreamMode.Write)) {
using (var msInput = new MemoryStream(input)) {
msInput.CopyTo(cryptoStream);
}
}
em.CipherBytes = msOutput.ToArray();
}
}
return em;
}
}
public static EncryptedMessage FromStream(Stream stream)
{
var em = new EncryptedMessage();
byte[] header = new byte[_headerSize];
stream.Read(header, 0, _headerSize);
MessageEncryptionType encryptionType = (MessageEncryptionType)header[0];
KeyEncryptionType keyType = (KeyEncryptionType)header[1];
int keySize = ByteLengthFromPoSize(header[2]);
int ivSize = header[3];
// read dataSize from header using a offset of 2
ushort dataSize = BitConverter.ToUInt16(header, 4);
byte[] iv = new byte[ivSize];
stream.Read(iv, 0, ivSize);
byte[] key = new byte[keySize];
stream.Read(key, 0, keySize);
byte[] data = new byte[dataSize];
stream.Read(data, 0, dataSize);
em.IV = iv;
em.Key = key;
em.CipherBytes = data;
em.KeyType = keyType;
em.EncryptionType = encryptionType;
return em;
}
public EncryptedMessage Encrypt(byte[] input)
{
var em = new EncryptedMessage();
em.EncryptionType = MessageEncryptionType.None;
em.IV = new byte[0];
em.Key = new byte[0];
em.CipherBytes = input;
return em;
}
public EncryptedMessage Encrypt(byte[] input)
{
var em = new EncryptedMessage();
em.EncryptionType = MessageEncryptionType.None;
em.IV = new byte[0];
em.Key = new byte[0];
em.CipherBytes = input;
return(em);
}
protected string decryptMessage(EncryptedMessage em)
{
var me = getMessageEncryption(em);
var ke = getKeyEncryption(em);
em.Key = ke.DecryptData(em.Key, KeyStore?.PrivateKey?.Key);
var bytes = me.Decrypt(em);
return Encoding.UTF8.GetString(bytes);
}
private IKeyEncryption getKeyEncryption(EncryptedMessage em)
{
switch (em.KeyType)
{
case KeyEncryptionType.Rsa:
return RSA.Default;
default:
case KeyEncryptionType.None:
return NoKey.Default;
}
}
public byte[] Decrypt(EncryptedMessage em)
{
using (var aes = new AesManaged())
{
aes.Key = em.Key;
aes.IV = em.IV;
using (var decryptor = aes.CreateDecryptor())
{
using (var msInput = new MemoryStream(em.CipherBytes))
{
using (var cryptoStream = new CryptoStream(msInput, decryptor, CryptoStreamMode.Read))
{
using (var msOutput = new MemoryStream())
{
cryptoStream.CopyTo(msOutput);
return(msOutput.ToArray());
}
}
}
}
}
}
public byte[] Decrypt(EncryptedMessage em)
{
using (var aes = new AesManaged())
{
aes.Key = em.Key;
aes.IV = em.IV;
using (var decryptor = aes.CreateDecryptor())
{
using (var msInput = new MemoryStream(em.CipherBytes))
{
using (var cryptoStream = new CryptoStream(msInput, decryptor, CryptoStreamMode.Read))
{
using (var msOutput = new MemoryStream())
{
cryptoStream.CopyTo(msOutput);
return msOutput.ToArray();
}
}
}
}
}
}
public byte[] Decrypt(EncryptedMessage em)
{
return em.CipherBytes;
}
protected override void encryptKey(ref EncryptedMessage em, Guid remoteId)
{
if (KeyEncryption is NoKey) return;
em.Key = KeyEncryption.EncryptData(em.Key, HubPublicKey?.Key);
em.KeyType = KeyEncryption.Type;
}
protected override void encryptKey(ref EncryptedMessage em, Guid remoteId)
{
if (KeyEncryption is NoKey) return;
if (!NodesPublicKeys.ContainsKey(remoteId))
throw new Exception(String.Format("No RSA public key for node \"{0}\" found!", remoteId.ToString()));
em.Key = KeyEncryption.EncryptData(em.Key, NodesPublicKeys[remoteId].Key);
em.KeyType = KeyEncryption.Type;
}
public byte[] Decrypt(EncryptedMessage em)
{
return(em.CipherBytes);
}
private IMessageEncryption getMessageEncryption(EncryptedMessage em)
{
switch(em.EncryptionType)
{
case MessageEncryptionType.Aes:
return Rijndael.Default;
default:
case MessageEncryptionType.None:
return PlainText.Default;
}
}
protected abstract void encryptKey(ref EncryptedMessage em, Guid remoteId);