public static async Task <CNG> DecryptAsync(Stream encryptedStream, Byte[] iv, Byte[] bkey)
{
CNG cng = new CNG();
cng.Key = bkey;
cng.Iv = iv;
cng.Stream = encryptedStream;
return(await Task.Factory.StartNew(() =>
{
using (Aes aes = new AesCryptoServiceProvider())
{
aes.Key = cng.Key;
aes.IV = cng.Iv;
aes.Padding = PaddingMode.PKCS7;
// Decrypt the message
using (MemoryStream plaintext = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(plaintext, aes.CreateDecryptor(), CryptoStreamMode.Write))
{
encryptedStream.CopyTo(cs);
cs.Close();
cng.PlaintextBytes = plaintext.ToArray();
}
}
}
return cng;
}));
}
public AES()
{
CNG c = new CNG();
c.Key = Key = RijndaelManaged.Create().Key;
Cng = c;
}
public static CNG Decrypt(CNG c)
{
Decrypt(out c.PlaintextBytes, c.EncryptedBytes, c.Iv, c.Key);
c.EncryptedBytes = null;
c.Iv = null;
return(c);
}
public static async Task <CNG> EncryptAsync(Byte[] key, Stream plaintextMessage)
{
CNG cng = new CNG();
cng.Key = key;
cng.Stream = plaintextMessage;
return(await Task.Factory.StartNew(() =>
{
using (Aes aes = new AesCryptoServiceProvider())
{
aes.Key = key;
cng.Iv = aes.IV;
aes.Padding = PaddingMode.PKCS7;
using (MemoryStream ciphertext = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ciphertext, aes.CreateEncryptor(), CryptoStreamMode.Write))
{
plaintextMessage.CopyTo(cs);
cs.Close();
cng.EncryptedBytes = ciphertext.ToArray();
}
}
return cng;
}
}));
}
public static CNG B(CNG c)
{
if (c.Bob == null)
{
c.Bob = new ECDiffieHellmanCng();
c.Bob.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
c.Bob.HashAlgorithm = CngAlgorithm.Sha256;
c.PublicKey = c.Bob.PublicKey.ToByteArray();
//c.cngkey = CngKey.Import(c.bpublicKey, CngKeyBlobFormat.EccPublicBlob);
c.Key = c.Bob.DeriveKeyMaterial(CngKey.Import(c.bPublicKey, CngKeyBlobFormat.EccPublicBlob));
c.Iv = null;
c.bPublicKey = null;
//c.bob = null;
c.EncryptedBytes = null;
c.PlaintextBytes = null;
// c.alice = null;
return(c);
}
if (c.Bob != null)
{
c.CngKey = CngKey.Import(c.bPublicKey, CngKeyBlobFormat.EccPublicBlob);
//c.bcngkey = c.cngkey;
c.Key = c.Bob.DeriveKeyMaterial(CngKey.Import(c.bPublicKey, CngKeyBlobFormat.EccPublicBlob));
c.EncryptedBytes = null;
c.Iv = null;
//c.publicKey = null;
c.bPublicKey = null;
//c.bob = null;
c.PlaintextBytes = null;
//c.alice = null;
return(c);
}
c.EncryptedBytes = null;
c.Iv = null;
//c.publicKey = null;
c.bPublicKey = null;
//c.bob = null;
c.EncryptedBytes = null;
c.PlaintextBytes = null;
//c.alice = null;
return(c);
}
public static CNG A(CNG c)
{
if (c.Alice == null)
{
c.Alice = new ECDiffieHellmanCng();
c.Alice.KeyDerivationFunction = ECDiffieHellmanKeyDerivationFunction.Hash;
c.Alice.HashAlgorithm = CngAlgorithm.Sha256;
c.PublicKey = c.Alice.PublicKey.ToByteArray();
c.EncryptedBytes = null;
c.Iv = null;
c.PlaintextBytes = null;
return(c);
}
if (c.Alice != null)
{
try
{
c.CngKey = CngKey.Import(c.bPublicKey, CngKeyBlobFormat.EccPublicBlob);
c.Key = c.Alice.DeriveKeyMaterial(CngKey.Import(c.bPublicKey, CngKeyBlobFormat.EccPublicBlob));
c.Iv = null;
//c.publicKey = null;
c.bPublicKey = null;
//c.bob = null;
c.EncryptedBytes = null;
c.PlaintextBytes = null;
//c.alice = null;
return(c);
}
catch (Exception) { return(c); }
}
c.Iv = null;
//c.publicKey = null;
c.bPublicKey = null;
//c.bob = null;
c.EncryptedBytes = null;
c.PlaintextBytes = null;
//c.alice = null;
return(c);
}
public static CNG Encrypt(CNG c)
{
Encrypt(c.Key, c.PlaintextBytes, out c.EncryptedBytes, out c.Iv);
c.PlaintextBytes = null;
return(c);
}
