| public CreateDecryptor ( ) : ICryptoTransform | ||
| Результат | ICryptoTransform | |
static Dictionary<string, string> Decrypt(string cipherText, string encryptionPassword, string salt)
{
using (var algorithm = new AesCryptoServiceProvider
{
Key =GetEncryptionKey(encryptionPassword),
IV = Convert.FromBase64String(salt)
})
using (var decryptor = algorithm.CreateDecryptor())
using (var decryptedTextStream = new MemoryStream())
using (var stringReader = new StreamReader(decryptedTextStream, Encoding.UTF8))
using (var jsonReader = new JsonTextReader(stringReader))
{
try
{
using (var cryptoStream = new CryptoStream(decryptedTextStream, decryptor, CryptoStreamMode.Write))
{
var cipherTextBytes = Convert.FromBase64String(cipherText);
cryptoStream.Write(cipherTextBytes, 0, cipherTextBytes.Length);
cryptoStream.FlushFinalBlock();
var dictionary = new Dictionary<string, string>();
var serializer = new JsonSerializer();
decryptedTextStream.Position = 0;
serializer.Populate(jsonReader, dictionary);
return dictionary;
}
}
catch (CryptographicException cryptoException)
{
throw new CommandException(
"Cannot decrypt sensitive-variables. Check your password is correct.\nError message: " +
cryptoException.Message);
}
}
}
/// <summary>
/// Decrypts data from one stream to another stream.
/// </summary>
/// <param name="input">Stream containing encrypted data</param>
/// <param name="output">Stream that will receive the decrypted data</param>
/// <param name="encryptionKey">Key to decrypt the data with</param>
/// <param name="IV">IV to decrypt the data with</param>
internal static void DecryptAesStream(Stream input, Stream output, byte[] encryptionKey, byte[] IV)
{
using (var aes = new AesCryptoServiceProvider {Padding = PaddingMode.ISO10126})
using (var decryptor = aes.CreateDecryptor(encryptionKey, IV))
{
var lengthBytes = new byte[AesHeaderSize];
input.Read(lengthBytes, 0, AesHeaderSize);
var length = BitConverter.ToInt32(lengthBytes, 0);
using (var cs = new CryptoStream(input, decryptor, CryptoStreamMode.Read))
{
long position = BufferSize;
var buffer = new byte[BufferSize];
while (position<length)
{
cs.Read(buffer, 0, BufferSize);
output.Write(buffer, 0, BufferSize);
position += BufferSize;
}
int offset = length % BufferSize;
if (offset>0)
{
cs.Read(buffer, 0, offset);
output.Write(buffer, 0, offset);
}
output.Flush();
}
}
}
/// <summary>
/// Decrypts the specified crypt text.
/// </summary>
/// <param name="cryptoText">The crypto text.</param>
/// <returns>The plain text.</returns>
public string Decrypt(byte[] cryptoText)
{
string clearText;
using (var aes = new AesCryptoServiceProvider())
{
aes.Key = this.Key;
aes.IV = this.InitalizationVector;
var decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
using (var memoryStream = new MemoryStream(cryptoText))
{
using (var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
{
using (var streamReader = new StreamReader(cryptoStream))
{
clearText = streamReader.ReadToEnd();
}
}
}
}
return clearText;
}
public static string Decrypt(string input)
{
//byte[] inputBytes = Convert.FromBase64String(input); //Encoding.UTF8.GetBytes(input);
string[] sInput = input.Split("-".ToCharArray());
byte[] inputBytes = new byte[sInput.Length];
for (int i = 0; i < sInput.Length; i++)
{
inputBytes[i] = byte.Parse(sInput[i], NumberStyles.HexNumber);
}
byte[] keyBytes = Encoding.UTF8.GetBytes(key.Substring(0, 32));
using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
{
aesAlg.Key = keyBytes;
aesAlg.IV = AesIv;
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
using (MemoryStream msEncrypt = new MemoryStream(inputBytes))
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srEncrypt = new StreamReader(csEncrypt))
{
return srEncrypt.ReadToEnd();
}
}
}
}
}
public void SetUp()
{
using ( AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider() ) {
m_Encryptor = aesAlg.CreateEncryptor();
m_Decryptor = aesAlg.CreateDecryptor();
}
}
public void Decrypt(string filename)
{
FileStream fsInput = new FileStream(filename, FileMode.Open, FileAccess.Read);
FileStream fsOutput = new FileStream(filename + ".crypt", FileMode.Create, FileAccess.Write);
AesCryptoServiceProvider Aes = new AesCryptoServiceProvider();
Aes.KeySize = 128;
byte[] input = new byte[256];
int count = fsInput.Read(input, 0, 256);
Aes.Key = _algorithm_asym.Decrypt(input, false);
count = fsInput.Read(input, 0, 256);
Aes.IV = _algorithm_asym.Decrypt(input, false);
ICryptoTransform desencrypt = Aes.CreateDecryptor();
CryptoStream cryptostream = new CryptoStream(fsOutput, desencrypt, CryptoStreamMode.Write);
byte[] bytearrayinput = new byte[fsInput.Length - 1];
fsInput.Read(bytearrayinput, 0, bytearrayinput.Length);
cryptostream.Write(bytearrayinput, 0, bytearrayinput.Length);
fsInput.Close();
fsOutput.Close();
}
public string Decription(byte[] encryptedData, byte[] alicePubKeyBlob)
{
byte[] rawData = null;
var aes = new AesCryptoServiceProvider();
int nBytes = aes.BlockSize >> 3;
byte[] iv = new byte[nBytes];
for (int i = 0; i < iv.Length; i++)
iv[i] = encryptedData[i];
using (var bobAlgorithm = new ECDiffieHellmanCng(privKey))
using (CngKey alicePubKey = CngKey.Import(alicePubKeyBlob,
CngKeyBlobFormat.EccPublicBlob))
{
byte[] symmKey = bobAlgorithm.DeriveKeyMaterial(alicePubKey);
aes.Key = symmKey;
aes.IV = iv;
using (ICryptoTransform decryptor = aes.CreateDecryptor())
using (MemoryStream ms = new MemoryStream())
{
var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Write);
cs.Write(encryptedData, nBytes, encryptedData.Length - nBytes);
cs.Close();
rawData = ms.ToArray();
}
aes.Clear();
}
return Encoding.UTF8.GetString(rawData);
}
public static byte[] Decrypt(byte[] encryptedString, string privateKey)
{
// We hash the private key string to ensure we have a key with the correct
// number of bytes.
var privateKeyHash = HashKey(privateKey);
using (var provider = new AesCryptoServiceProvider())
{
provider.Key = privateKeyHash;
using (var ms = new MemoryStream(encryptedString))
{
// Read the first 16 bytes which is the IV.
byte[] iv = new byte[16];
ms.Read(iv, 0, 16);
provider.IV = iv;
using (var decryptor = provider.CreateDecryptor())
{
using (var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))
{
return ReadToEnd(cs);
}
}
}
}
}
/// <summary>
/// 解密字节数组
/// </summary>
/// <param name="inputData">要解密的字节数据</param>
/// <param name="password">密码</param>
/// <returns></returns>
public static byte[] Decrypt(byte[] inputData, string password)
{
AesCryptoServiceProvider aes = new AesCryptoServiceProvider
{
Key = GetKeyArray(password),
Mode = cipherMode,
Padding = paddingMode
};
var transform = aes.CreateDecryptor();
byte[] data = null;
try
{
data = transform.TransformFinalBlock(inputData, 0, inputData.Length);
}
catch
{
return null;
}
aes.Clear();
return data;
}
public static long Decrypt(string cipherText)
{
if (cipherText == null || cipherText.Length <= 0)
throw new ArgumentNullException("cipherText");
if (AesCryptoServiceProvider.Key == null || AesCryptoServiceProvider.Key.Length <= 0)
throw new ArgumentNullException("Key");
if (AesCryptoServiceProvider.IV == null || AesCryptoServiceProvider.IV.Length <= 0)
throw new ArgumentNullException("IV");
string plaintext;
using (var aesAlg = new AesCryptoServiceProvider())
{
aesAlg.Key = AesCryptoServiceProvider.Key;
aesAlg.IV = AesCryptoServiceProvider.IV;
var decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
using (var msDecrypt = new MemoryStream(Convert.FromBase64String(cipherText)))
{
using (var csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (var srDecrypt = new StreamReader(csDecrypt))
{
plaintext = srDecrypt.ReadToEnd();
}
}
}
}
return Convert.ToInt64(plaintext);
}
protected override string DecryptByBlocks(byte[] key, byte[] iv,
List<byte> cipherText)
{
var message = new StringBuilder();
using (var aes = new AesCryptoServiceProvider())
{
aes.BlockSize = BlockSize * 8;
aes.KeySize = KeySize * 8;
aes.Key = key;
aes.IV = iv;
aes.Padding = PaddingMode.None;
using (var decr = aes.CreateDecryptor())
{
while (cipherText.Count != 0)
{
if (cipherText.Count == BlockSize)
{
aes.Padding = PaddingMode.PKCS7;
}
var block = DetachBlock(cipherText);
var decrypted = new byte[BlockSize];
decr.TransformBlock(block, 0, BlockSize, decrypted, 0);
if (!decrypted.All(x => x == BlockSize))
{
message.Append(BytesToPlainText(decrypted));
}
aes.IV = block;
}
}
}
return message.ToString();
}
public string decrypt(byte[] msg, byte[] key)
{
using (var d = new System.Security.Cryptography.AesCryptoServiceProvider())
{
var iv = Enumerable.Repeat((byte)0, 16).ToArray();
d.IV = iv;
d.Key = key;
d.Mode = CipherMode.CBC;
d.Padding = PaddingMode.None;
var t = d.CreateDecryptor();
using (var ms = new System.IO.MemoryStream(msg))
{
using (var cs = new CryptoStream(ms, t, CryptoStreamMode.Read))
{
using (var sr = new System.IO.StreamReader(cs))
{
var r = sr.ReadToEnd();
return(r);
}
}
}
}
}
public string Decrypt(string cipherText, string key, string iv)
{
try
{
AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
//aes.BlockSize = 128; //aes.KeySize = 256;
aes.Mode = CipherMode.CBC;
aes.Padding = PaddingMode.PKCS7;
aes.IV = new byte[16];// Encoding.UTF8.GetBytes("DBDF15AA65379176");
aes.Key = Encoding.UTF8.GetBytes(key);
// Convert Base64 strings to byte array
byte[] src = System.Convert.FromBase64String(cipherText);
// decryption
using (ICryptoTransform decrypt = aes.CreateDecryptor())
{
byte[] dest = decrypt.TransformFinalBlock(src, 0, src.Length);
return Encoding.UTF8.GetString(dest);
}
}
catch
{
return string.Empty;
}
}
/// <summary>
/// Decrypts a file encrypted with AES
/// </summary>
/// <param name="filePath">Full path of the file to be decrypted</param>
/// <param name="outputFilePath">Full path of the decrypted file</param>
/// <param name="key">AES decryption key</param>
/// <param name="iv">AES initialization vector</param>
/// <param name="useECBMode">boolean to determine if ECB or CBC mode is used</param>
public static void DecryptFile(string filePath, string outputFilePath, byte[] key, byte[] iv, bool useECBMode)
{
using (AesCryptoServiceProvider aes = new AesCryptoServiceProvider())
{
if (useECBMode)
aes.Mode = CipherMode.ECB;
else
aes.Mode = CipherMode.CBC;
aes.Key = key;
aes.IV = iv;
using (ICryptoTransform cryptoTransform = aes.CreateDecryptor(aes.Key, aes.IV))
{
using (FileStream encrypted = File.Open(filePath, FileMode.Open, FileAccess.Read, FileShare.Read))
{
using (FileStream plain = File.Open(outputFilePath, FileMode.Create, FileAccess.Write, FileShare.None))
{
using (CryptoStream cs = new CryptoStream(plain, cryptoTransform, CryptoStreamMode.Write))
{
encrypted.CopyTo(cs, bufferSize);
}
}
}
}
}
}
/// <summary>
/// Decrypt a message using AES in CBC (cipher-block chaining) mode.
/// </summary>
/// <param name="ciphertext">The message encrypted with AES in CBC mode</param>
/// <param name="key">The key used to encrypt the message</param>
/// <param name="iv">The initialization vector provided, if one was provided. If you are absolutely certain
/// the key will only be used once, an IV is not necessary and zero will be used.</param>
/// <param name="checkAndRemoveHmac">Set if an HMACHSA256 was placed at the end of the plaintext before encrypting.
/// The HMAC will be removed before the plaintext is returned. If the HMAC does not match, the method will throw a
/// System.Security.Cryptography.CryptographicException.</param>
/// <returns>The plaintext resulting from decrypting the ciphertext with the given key.</returns>
public static byte[] DecryptAesCbc(byte[] ciphertext, byte[] key, byte[] iv = null, bool checkAndRemoveHmac = false)
{
using (AesCryptoServiceProvider aes = new AesCryptoServiceProvider())
{
aes.Key = key;
if (iv == null)
iv = NullIv;
aes.IV = iv;
aes.Mode = CipherMode.CBC;
// Decrypt the message
using (System.IO.MemoryStream plaintextStream = new System.IO.MemoryStream())
{
using (CryptoStream cs = new CryptoStream(plaintextStream, aes.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(ciphertext, 0, ciphertext.Length);
}
byte[] plaintext = plaintextStream.ToArray();
if (checkAndRemoveHmac)
{
byte[] hmacProvided = plaintext.Skip(plaintext.Length - Sha256HmacLength).ToArray();
plaintext = plaintext.Take(plaintext.Length - Sha256HmacLength).ToArray();
byte[] hmacCalculated = new HMACSHA256(key).ComputeHash(plaintext);
if (!hmacProvided.SequenceEqual(hmacCalculated))
throw new CryptographicException("Message authentication code validation failed.");
}
return plaintext;
}
}
}
public static string AESDecryptor(string encryptedString, byte[] Key, byte[] IV)
{
byte[] data = Convert.FromBase64String(encryptedString);
AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
string decryptedString = ASCIIEncoding.ASCII.GetString(aes.CreateDecryptor(Key, IV).TransformFinalBlock(data, 0, data.Length));
return decryptedString;
}
/// <summary>
/// AES解密
/// </summary>
/// <param name="str">待解密字符串</param>
/// <returns>解密后字符串</returns>
public static string AesDecrypt(string str)
{
try
{
string key = AES_KEY;
byte[] cipherText = Convert.FromBase64String(str);
AesCryptoServiceProvider aes = new AesCryptoServiceProvider();
aes.Key = Encoding.UTF8.GetBytes(key);
//aes.IV = Encoding.UTF8.GetBytes(key);
aes.Mode = CipherMode.ECB;
aes.Padding = PaddingMode.PKCS7;
byte[] decryptBytes = new byte[cipherText.Length];
using (MemoryStream ms = new MemoryStream(cipherText))
{
using (CryptoStream cs = new CryptoStream(ms, aes.CreateDecryptor(), CryptoStreamMode.Read))
{
cs.Read(decryptBytes, 0, decryptBytes.Length);
cs.Close();
ms.Close();
}
}
return Encoding.UTF8.GetString(decryptBytes).Replace("\0", ""); //将字符串后尾的'\0'去掉
}
catch { }
return str;
}
public byte[] Unprotect(byte[] protectedData)
{
byte[] output = null;
using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
{
aesAlg.Key = _key;
aesAlg.IV = _IV;
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
using (MemoryStream msDecrypt = new MemoryStream(protectedData))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
byte[] buffer = new byte[8];
using (MemoryStream msOutput = new MemoryStream())
{
int read;
while ((read = csDecrypt.Read(buffer, 0, buffer.Length)) > 0)
{
msOutput.Write(buffer, 0, read);
}
output = msOutput.ToArray();
}
}
}
}
return output;
}
private Stream DecryptMessage(Stream outputStream, string keyString)
{
var key = Convert.FromBase64String(keyString);
using (var provider = new AesCryptoServiceProvider())
{
provider.Key = key;
provider.Mode = CipherMode.CBC;
provider.Padding = PaddingMode.PKCS7;
var ms = new MemoryStream();
outputStream.CopyTo(ms);
ms.Seek(0, SeekOrigin.Begin);
ms.Position = 0;
byte[] iv = new byte[16];
ms.Read(iv, 0, 16);
provider.IV = iv;
Trace.WriteLine("IV decrypt " + provider.IV);
var decryptor = provider.CreateDecryptor(provider.Key, provider.IV);
return new CryptoStream(ms, decryptor, CryptoStreamMode.Read);
}
}
/// <summary>
/// AES解密
/// </summary>
/// <param name="inputString">密钥</param>
/// <param name="sKey">向量</param>
/// <returns>明文</returns>
public static string DecryptAES(string inputString, string sKey = Key)
{
if (string.IsNullOrWhiteSpace(inputString))
return string.Empty;
string plaintext = null;
using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
{
aesAlg.KeySize = 128;
aesAlg.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
aesAlg.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
using (MemoryStream msDecrypt = new MemoryStream(Convert.FromBase64String(inputString)))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
plaintext = srDecrypt.ReadToEnd();
}
}
}
}
return plaintext;
}
private static void BobReceiveData(byte[] encryptData)
{
byte[] rawdata = null;
var aes = new AesCryptoServiceProvider();
int nBytes = aes.BlockSize >> 3; // bit to Byte, need to devide 8
byte[] iv = new byte[nBytes];
for (int i = 0; i < iv.Length; i++)
iv[i] = encryptData[i];
using (var bobAlgorithm = new ECDiffieHellmanCng(bobKey))
using (CngKey alicePubKey = CngKey.Import(alicePubKeyBlob, CngKeyBlobFormat.EccPublicBlob))
{
byte[] symmKey = bobAlgorithm.DeriveKeyMaterial(alicePubKey);
Console.WriteLine(Convert.ToBase64String(symmKey));
aes.Key = symmKey;
aes.IV = iv;
}
using (ICryptoTransform decryptor = aes.CreateDecryptor())
using (MemoryStream ms = new MemoryStream())
{
var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Write);
cs.Write(encryptData, nBytes, encryptData.Length - nBytes);
cs.Close();
rawdata = ms.ToArray();
Console.WriteLine(Encoding.UTF8.GetString(rawdata));
}
aes.Clear();
}
public static string DecryptString(byte[] encryptedString, byte[] encryptionKey)
{
using (var provider = new AesCryptoServiceProvider())
{
provider.Key = encryptionKey;
using (var ms = new MemoryStream(encryptedString))
{
// Read the first 16 bytes which is the IV.
byte[] iv = new byte[16];
ms.Read(iv, 0, 16);
provider.IV = iv;
using (var decryptor = provider.CreateDecryptor())
{
using (var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))
{
using (var sr = new StreamReader(cs))
{
return sr.ReadToEnd();
}
}
}
}
}
}
void Button2Click(object sender, EventArgs e)
{
if (openfile.ShowDialog() == DialogResult.OK)
{
FileStream fsFileIn = File.OpenRead(textBox2.Text);
FileStream fsKeyFile = File.OpenRead(openfile.FileName);
FileStream fsFileOut = File.Create(textBox2.Text+"_decrypt");
AesCryptoServiceProvider cryptAlgorithm = new AesCryptoServiceProvider();
BinaryReader brFile = new BinaryReader(fsKeyFile);
//textBox1.Text = key.ToString();
StreamWriter writer = File.AppendText(@"key.txt");
writer.WriteLine(key.Length);
cryptAlgorithm.Key = key;
cryptAlgorithm.IV = iv;
CryptoStream csEncrypt = new CryptoStream(fsFileIn, cryptAlgorithm.CreateDecryptor(), CryptoStreamMode.Read);
StreamReader srStream = new StreamReader(csEncrypt);
StreamWriter swStream = new StreamWriter(fsFileOut);
swStream.WriteLine(srStream.ReadToEnd());
swStream.Close();
fsFileOut.Close();
srStream.Close();
}
}
// ReSharper disable once InconsistentNaming
public byte[] DecryptAES(byte[] dataToDecrypt, byte[] key, byte[] iv)
{
using (var aes = new AesCryptoServiceProvider())
{
_logger.Info("mode: CBC");
aes.Mode = CipherMode.CBC;
_logger.Info("padding: PKCS7");
aes.Padding = PaddingMode.PKCS7;
aes.Key = key;
aes.IV = iv;
_logger.Info("create stream");
using (var memoryStream = new MemoryStream())
{
var cryptoStream = new CryptoStream(memoryStream,
aes.CreateDecryptor(), CryptoStreamMode.Write);
_logger.Info("write data to stream");
cryptoStream.Write(dataToDecrypt, 0, dataToDecrypt.Length);
cryptoStream.FlushFinalBlock();
byte[] decryptBytes = memoryStream.ToArray();
return decryptBytes;
}
}
}
public string PerformDecryption(string input)
{
string output = "";
Aes aes = new AesCryptoServiceProvider();
//DES des = new DESCryptoServiceProvider();
aes.Mode = CipherMode.CBC;
try
{
UTF8Encoding utf8 = new UTF8Encoding();
byte[] ciphertext = Convert.FromBase64String(input);
byte[] key = Encoding.ASCII.GetBytes(Security_Key);
byte[] IV = Encoding.ASCII.GetBytes(vec);
aes.Key = key;
aes.IV = IV;
ICryptoTransform transform = aes.CreateDecryptor(aes.Key, aes.IV);
MemoryStream memDecryptStream = new MemoryStream();
memDecryptStream.Write(ciphertext, 0, ciphertext.Length);
CryptoStream cs_decrypt = new CryptoStream(memDecryptStream, transform, CryptoStreamMode.Write);
byte[] plaintext = memDecryptStream.ToArray();
//output = Encoding.ASCII.GetString(plaintext);
output = utf8.GetString(plaintext);
}
catch (Exception e)
{
throw e;
}
return output;
}
/// <summary>
/// Decrypts a ProcessedPacket.
/// </summary>
/// <param name="InitializationVector">Initialization vec to be used by AES.</param>
/// <param name="PrivateKey">Private key to be used.</param>
/// <param name="PubKeyBlob">Public key blob to be used.</param>
/// <param name="StreamToDecrypt">The stream to decrypt.</param>
/// <returns>A decrypted stream.</returns>
public static byte[] DecryptData(byte[] InitializationVector, CngKey PrivateKey, byte[] PubKeyBlob,
byte[] DataToDecrypt)
{
using (var Algorithm = new ECDiffieHellmanCng(PrivateKey))
{
using (CngKey PubKey = CngKey.Import(PubKeyBlob,
CngKeyBlobFormat.EccPublicBlob))
{
byte[] SymmetricKey = Algorithm.DeriveKeyMaterial(PubKey);
Console.WriteLine("DecryptedStream: Created symmetric key with " +
"public key information: {0}", Convert.ToBase64String(SymmetricKey));
AesCryptoServiceProvider AES = new AesCryptoServiceProvider();
AES.Key = SymmetricKey;
AES.IV = InitializationVector;
int NBytes = AES.BlockSize >> 3; //No idea...
using (ICryptoTransform Decryptor = AES.CreateDecryptor())
{
using (MemoryStream DecryptedStream = new MemoryStream())
{
var cs = new CryptoStream(DecryptedStream, Decryptor, CryptoStreamMode.Write);
cs.Write(DataToDecrypt, NBytes, DataToDecrypt.Length - NBytes);
cs.FlushFinalBlock();
return DecryptedStream.ToArray();
}
}
}
}
}
static string DecryptStringFromBytes_Aes(byte[] cipherText, AesCryptoServiceProvider cryptoProvider)
{
// Check arguments.
if (cipherText == null || cipherText.Length <= 0)
throw new ArgumentNullException("cipherText");
string plaintext = null;
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = cryptoProvider.CreateDecryptor(cryptoProvider.Key, cryptoProvider.IV);
// Create the streams used for decryption.
using (MemoryStream msDecrypt = new MemoryStream(cipherText))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
// Read the decrypted bytes from the decrypting stream
// and place them in a string.
plaintext = srDecrypt.ReadToEnd();
}
}
}
return plaintext;
}
ICryptoTransform CreateDecryptor(byte[] key, byte[] iv)
{
using (var provider = new AesCryptoServiceProvider {Padding = _paddingMode})
{
return provider.CreateDecryptor(key, iv);
}
}
public static string DecryptAES(byte[] data, byte[] key, byte[] IV)
{
string retVal = string.Empty;
var tsp = new System.Security.Cryptography.AesCryptoServiceProvider();
// default padding and mode
tsp.Mode = CipherMode.CBC;
tsp.Padding = PaddingMode.PKCS7;
// get a crypt transform interface
ICryptoTransform ct = tsp.CreateDecryptor(key, IV);
// setup a memory stream
MemoryStream ms = new MemoryStream();
using (CryptoStream cs = new CryptoStream(ms, ct, CryptoStreamMode.Write))
{
// write the string through the crypto stream
cs.Write(data, 0, data.Length);
// flush
cs.FlushFinalBlock();
// convert the data in the memory stream to base64 text
ms.Seek(0, SeekOrigin.Begin);
var enc = ms.ToArray();//.TakeWhile(c => c > 16).ToArray();
retVal = System.Text.Encoding.ASCII.GetString(enc, 0, enc.Length);
}
return retVal;
}
public static byte[] decrypt(byte[] encrypted, byte[] Key, byte[] IV)
{
try
{
byte[] plain;
int count;
using (MemoryStream mStream = new MemoryStream(encrypted))
{
using (AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider())
{
aesProvider.Mode = CipherMode.CBC;
using (CryptoStream cryptoStream = new CryptoStream(mStream,
aesProvider.CreateDecryptor(Key, IV), CryptoStreamMode.Read))
{
plain = new byte[encrypted.Length];
count = cryptoStream.Read(plain, 0, plain.Length);
}
}
}
byte[] returnValue = new byte[count];
Array.Copy(plain, returnValue, count);
return returnValue;
}
catch (Exception e)
{
Logger.log(e.StackTrace);
throw e;
}
}
public static string Decrypt256FromHEX(string keyin, string ivin, string cipherText)
{
string result = string.Empty;
try
{
byte[] key = Encoding.UTF8.GetBytes(keyin);
byte[] iv = Encoding.UTF8.GetBytes(ivin);
AesCryptoServiceProvider aesProvider = new AesCryptoServiceProvider();
aesProvider.Mode = CipherMode.CBC;
aesProvider.Padding = PaddingMode.Zeros;
byte[] cipherTextBytesForDecrypt = HexStringToByteArray(cipherText);
ICryptoTransform cryptoDecryptor = aesProvider.CreateDecryptor(key, iv);
MemoryStream memStreamEncryptData = new MemoryStream(cipherTextBytesForDecrypt);
CryptoStream rStream = new CryptoStream(memStreamEncryptData, cryptoDecryptor, CryptoStreamMode.Read);
byte[] plainTextBytes = new byte[cipherTextBytesForDecrypt.Length];
int decryptedByteCount = rStream.Read(plainTextBytes, 0, plainTextBytes.Length);
memStreamEncryptData.Close();
rStream.Close();
result = Encoding.Default.GetString(plainTextBytes, 0, decryptedByteCount).Replace("\0", "");
}
catch (System.Security.Cryptography.CryptographicException)
{
result = cipherText;
}
return result;
}
void recv(IAsyncResult res)
{
byte[] received;
try
{
received = serverUdp.EndReceive(res, ref RemoteIp);
}
catch {
return;
}
//check if connected and check that the ip corresponds
if (connected && RemoteIp.Address.ToString() != connectedIp)
{
//if not just ignore
//this avoids that a broadcast can pass
return;
}
data = Encoding.UTF8.GetString(received);
Console.WriteLine(data);
try {
//broadcast
if (received[0] == BROADCAST)
{
//Keyboard.SendKeyUp(0);
//TODO: if connected check if client is active
Console.WriteLine(RemoteIp.Address.ToString());
sendAlive();
}
else if (connected && (received[0] == CONNECTED || received[0] == CONNECTED_PASSWORD))
{
if (usingPassword && received[0] == CONNECTED_PASSWORD)
{
ICryptoTransform decryptor = crypto.CreateDecryptor(crypto.Key, crypto.IV);
var origValue = decryptor.TransformFinalBlock(received, 1, received.Length - 1);
InputDispatcher.dispatch(origValue);
}
else if (!usingPassword && received[0] == CONNECTED)
{
byte[] destfoo = new byte[received.Length - 1];
Array.Copy(received, 1, destfoo, 0, received.Length - 1);
InputDispatcher.dispatch(destfoo);
}
else
{
//TODO: codice errore
sendMessage(RemoteIp.Address.ToString(), CONNECTION_ERROR);
}
}
}
catch (Exception e)
{
Console.Write(e.StackTrace);
}
serverUdp.BeginReceive(new AsyncCallback(recv), null);
}
byte[] Transform(byte[] dataBytes, byte[] passwordBytes, bool encrypt)
{
/// <summary>Encrypt by using AES-256 algorithm.</summary>
// Create an instance of the AES class.
var cipher = new System.Security.Cryptography.AesCryptoServiceProvider();
// Calculate salt to make it harder to guess key by using a dictionary attack.
var hmac = new System.Security.Cryptography.HMACSHA1(passwordBytes);
var salt = hmac.ComputeHash(passwordBytes);
// Generate Secret Key from the password and salt.
// Note: Set number of iterations to 10 in order for JavaScript example to work faster.
var secretKey = new System.Security.Cryptography.Rfc2898DeriveBytes(passwordBytes, salt, 10);
// Create a encryptor from the existing SecretKey bytes by using
// 32 bytes (256 bits) for the secret key and
// 16 bytes (128 bits) for the initialization vector (IV).
var key = secretKey.GetBytes(32);
var iv = secretKey.GetBytes(16);
// Get cryptor as System.Security.Cryptography.ICryptoTransform class.
var cryptor = encrypt
? cipher.CreateEncryptor(key, iv)
: cipher.CreateDecryptor(key, iv);
// Create new Input.
var inputBuffer = new byte[dataBytes.Length];
// Copy data bytes to input buffer.
System.Buffer.BlockCopy(dataBytes, 0, inputBuffer, 0, inputBuffer.Length);
// Create a MemoryStream to hold the output bytes.
var stream = new System.IO.MemoryStream();
// Create a CryptoStream through which we are going to be processing our data.
var mode = System.Security.Cryptography.CryptoStreamMode.Write;
var cryptoStream = new System.Security.Cryptography.CryptoStream(stream, cryptor, mode);
// Start the crypting process.
cryptoStream.Write(inputBuffer, 0, inputBuffer.Length);
// Finish crypting.
cryptoStream.FlushFinalBlock();
// Convert data from a memoryStream into a byte array.
var outputBuffer = stream.ToArray();
// Close both streams.
stream.Close();
cryptoStream.Close();
return(outputBuffer);
}
private static byte[] _DecryptData(byte[] data, byte[] IV, int bitLength, byte[] passphrase)
{
var aes = new System.Security.Cryptography.AesCryptoServiceProvider();
var iv = new byte[16]; //always 16 for AES
var key = new byte[IV.Length == 7 ? 32 : IV.Length / 8]; //HACK: for "AES-56", convert to AES-256
var ret = new byte[data.Length];
//Pad the IV if necessary
Array.Copy(IV, iv, IV.Length);
//Derive the key
var derived = _DeriveEncryptionKey(bitLength, passphrase);
Array.Copy(derived, key, derived.Length);
//Decrypt it!
aes.CreateDecryptor(key, iv).TransformBlock(data, 0, data.Length, ret, 0);
return(ret);
}
public static byte[] Decrypt(string privateKey, byte[] data)
{
using (var aes = new AesCryptoServiceProvider())
{
var iv = new byte[128];
var key = new byte[128];
Buffer.BlockCopy(data, 0, iv, 0, 128);
Buffer.BlockCopy(data, 128, key, 0, 128);
using (var encryptor = aes.CreateDecryptor(Rsa.Decrypt(privateKey, key), Rsa.Decrypt(privateKey, iv)))
using (var src = new MemoryStream(data, writable: false))
using (var dst = new MemoryStream())
{
src.Seek(256, SeekOrigin.Begin);
using (var cs = new CryptoStream(src, encryptor, CryptoStreamMode.Read))
{
cs.CopyTo(dst);
}
return(dst.ToArray());
}
}
}
