public bool encrypt(string path, string password, string destFile)
{
byte[] saltBytes = Encoding.ASCII.GetBytes(salt);
byte[] valueBytes = zip(path);
byte[] encryptedBytes;
try
{
Rfc2898DeriveBytes passBytes = new Rfc2898DeriveBytes(password, saltBytes, iterations);
byte[] keyBytes = passBytes.GetBytes(aes.KeySize / 8);
aes.Key = keyBytes;
using (MemoryStream memoryStream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, aes.CreateEncryptor(), CryptoStreamMode.Write))
{
cryptoStream.Write(valueBytes, 0, valueBytes.Length);
}
encryptedBytes = memoryStream.ToArray();
}
aes.Clear();
File.WriteAllBytes(destFile, encryptedBytes);
return(true);
}
catch (Exception e)
{
Logger.add(e.ToString());
return(false);
}
}
public static string Encrypt(string input)
{
byte[] vectorBytes = Encoding.ASCII.GetBytes(Vector);
byte[] saltBytes = Encoding.ASCII.GetBytes(Salt);
byte[] inputBytes = Encoding.UTF8.GetBytes(input);
byte[] encrypted;
using (var cipher = new AesManaged())
using (var passwordBytes = new PasswordDeriveBytes(PassPhrase, saltBytes, Hash, Iterations))
{
byte[] keyBytes = passwordBytes.GetBytes(KeySize / 8);
cipher.Mode = CipherMode.CBC;
using (var encryptor = cipher.CreateEncryptor(keyBytes, vectorBytes))
using (var ms = new MemoryStream())
using (var writer = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
{
writer.Write(inputBytes, 0, inputBytes.Length);
writer.FlushFinalBlock();
encrypted = ms.ToArray();
}
cipher.Clear();
}
return(Convert.ToBase64String(encrypted));
}
internal static string DecryptData(string dataToDecrypt, string Key)
{
var tdes = new AesManaged
{
KeySize = 256,
BlockSize = 128,
Key = Encoding.UTF8.GetBytes(Key),
Mode = CipherMode.ECB,
Padding = PaddingMode.PKCS7
};
string a = dataToDecrypt.Replace(" ", "+");
int mod4 = a.Length % 4;
if (mod4 > 0)
{
a += new string('=', 4 - mod4);
}
var dataToDecryptBytes = Convert.FromBase64String(a);
var decrypt = tdes.CreateDecryptor();
var deCipher = decrypt.TransformFinalBlock(dataToDecryptBytes, 0, dataToDecryptBytes.Length);
tdes.Clear();
var plainText = Encoding.UTF8.GetString(deCipher);
return(plainText);
}
/// <summary>
/// Encrypts the specified data using a 128-bit cipher. The key can be any length.
/// </summary>
/// <param name="Data">The data to be encrypted.</param>
/// <param name="Key">The key used to encrypt the data.</param>
/// <returns>A Base-64 string containing the encoded data.</returns>
public static string Encrypt128Base64(string Data, byte[] Key)
{
AesManaged AES = null;
var MS = new MemoryStream();
CryptoStream CS = null;
try
{
//Get the IV and length corrected Key.
KeyData KeyData = GenerateKeyIV128(Key);
//Create the AES crytpograhy object.
AES = new AesManaged {
BlockSize = 128, KeySize = 128, Key = KeyData.Key, IV = KeyData.IV
};
CS = new CryptoStream(MS, AES.CreateEncryptor(), CryptoStreamMode.Write);
CS.Write(System.Text.Encoding.UTF8.GetBytes(Data), 0, System.Text.Encoding.UTF8.GetByteCount(Data));
CS.FlushFinalBlock();
return(Convert.ToBase64String(MS.ToArray()));
}
finally
{
if (AES != null)
{
AES.Clear();
}
if (CS != null)
{
CS.Dispose();
}
MS.Dispose();
}
}
/// <summary>
/// Decrypts the specified data using a 128-bit cipher. The key can be any length.
/// </summary>
/// <param name="Data">The data to be decrypted.</param>
/// <param name="Key">The key used to decrypt the data.</param>
/// <returns>A string containing the decoded data.</returns>
public static Stream Decrypt128Stream(Stream Data, byte[] Key)
{
AesManaged AES = null;
CryptoStream CS = null;
try
{
//Get the IV and length corrected Key.
KeyData KeyData = GenerateKeyIV128(Key);
//Create the AES crytpograhy object.
AES = new AesManaged {
BlockSize = 128, KeySize = 128, Key = KeyData.Key, IV = KeyData.IV
};
CS = new CryptoStream(Data, AES.CreateDecryptor(), CryptoStreamMode.Read);
var D = new byte[CS.Length];
CS.Read(D, 0, (int)CS.Length - 1);
return(new MemoryStream(D));
}
finally
{
if (AES != null)
{
AES.Clear();
}
if (CS != null)
{
CS.Dispose();
}
}
}
/// <summary>
/// Decrypts the specified data using a 128-bit cipher. The key can be any length.
/// </summary>
/// <param name="Data">The data to be decrypted.</param>
/// <param name="Key">The key used to decrypt the data.</param>
/// <returns>A string containing the decoded data.</returns>
public static string Decrypt128String(Stream Data, byte[] Key)
{
AesManaged AES = null;
CryptoStream CS = null;
StreamReader DS = null;
try
{
//Get the IV and length corrected Key.
KeyData KeyData = GenerateKeyIV128(Key);
//Create the AES crytpograhy object.
AES = new AesManaged {
BlockSize = 128, KeySize = 128, Key = KeyData.Key, IV = KeyData.IV
};
CS = new CryptoStream(Data, AES.CreateDecryptor(), CryptoStreamMode.Read);
DS = new StreamReader(CS);
return(DS.ReadToEnd());
}
finally
{
if (AES != null)
{
AES.Clear();
}
if (CS != null)
{
CS.Dispose();
}
if (DS != null)
{
DS.Dispose();
}
}
}
/// <summary>
/// Encrypts the specified data using a 128-bit cipher. The key can be any length.
/// </summary>
/// <param name="Data">The data to be encrypted.</param>
/// <param name="Key">The key used to encrypt the data.</param>
/// <returns>A stream containing the encoded data.</returns>
public static Stream Encrypt128Stream(byte[] Data, byte[] Key)
{
AesManaged AES = null;
var MS = new MemoryStream();
CryptoStream CS = null;
try
{
//Get the IV and length corrected Key.
KeyData KeyData = GenerateKeyIV128(Key);
//Create the AES crytpograhy object.
AES = new AesManaged {
BlockSize = 128, KeySize = 128, Key = KeyData.Key, IV = KeyData.IV
};
CS = new CryptoStream(MS, AES.CreateEncryptor(), CryptoStreamMode.Write);
CS.Write(Data, 0, Data.Length);
CS.FlushFinalBlock();
return(MS);
}
finally
{
if (AES != null)
{
AES.Clear();
}
if (CS != null)
{
CS.Dispose();
}
MS.Dispose();
}
}
public void DecryptData()
{
MemoryStream memoryStream = null;
using (AesManaged aes = new AesManaged())
{
//Generate Key and IV values for decryption
Rfc2898DeriveBytes rfc2898 = new Rfc2898DeriveBytes(Password, Encoding.UTF8.GetBytes(SaltValue), 10000);
aes.Key = rfc2898.GetBytes(32);
aes.IV = rfc2898.GetBytes(16);
using (memoryStream = new MemoryStream())
{
using (CryptoStream cryptoStream =
new CryptoStream(memoryStream, aes.CreateDecryptor(),
CryptoStreamMode.Write))
{
//Decrypt Data
byte[] secret = Convert.FromBase64String(EncryptedData);
cryptoStream.Write(secret, 0, secret.Length);
cryptoStream.FlushFinalBlock();
byte[] decryptBytes = memoryStream.ToArray();
aes.Clear();
//Update values on UI thread
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
DecryptedData = Encoding.UTF8.GetString(decryptBytes, 0, decryptBytes.Length);
});
}
}
}
}
public static string Decrypt(string input)
{
byte[] vectorBytes = Encoding.ASCII.GetBytes(Vector);
byte[] saltBytes = Encoding.ASCII.GetBytes(Salt);
byte[] inputBytes = Convert.FromBase64String(input);
byte[] decrypted;
int decryptedByteCount = 0;
using (var cipher = new AesManaged())
using (var passwordBytes = new PasswordDeriveBytes(PassPhrase, saltBytes, Hash, Iterations))
{
byte[] keyBytes = passwordBytes.GetBytes(KeySize / 8);
cipher.Mode = CipherMode.CBC;
using (var decryptor = cipher.CreateDecryptor(keyBytes, vectorBytes))
using (var ms = new MemoryStream(inputBytes))
using (CryptoStream reader = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))
{
decrypted = new byte[inputBytes.Length];
decryptedByteCount = reader.Read(decrypted, 0, decrypted.Length);
}
cipher.Clear();
}
return(Encoding.UTF8.GetString(decrypted, 0, decryptedByteCount));
}
public string Decryption()
{
try {
byte[] encrypted = Convert.FromBase64String(textInput.Text);
MemoryStream ms = null;
CryptoStream cs = null;
StreamReader sr = null;
Aes aes = new AesManaged();
aes.Key = key;
aes.IV = new byte[16];
ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
ms = new MemoryStream(encrypted);
cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read);
sr = new StreamReader(cs);
string decrypted = sr.ReadToEnd();
ms.Dispose();
cs.Dispose();
sr.Dispose();
if (aes != null)
{
aes.Clear();
}
return(decrypted);
}
catch {
MessageBox.Show("Text entered was not valid encrypted text.");
return("");
}
}
private byte[] DecryptManaged(byte[] Key, byte[] Vector, byte[] Data)
{
byte[] decryptedBytes;
int count = 0;
using (MemoryStream stream = new MemoryStream(Data))
{
using (AesManaged cipher = new AesManaged())
{
cipher.Mode = CipherMode.CBC;
cipher.Padding = PaddingMode.None;
using (ICryptoTransform decryptor = cipher.CreateDecryptor(Key, Vector))
{
using (CryptoStream reader = new CryptoStream(stream, decryptor, CryptoStreamMode.Read))
{
decryptedBytes = new byte[stream.Length];
count = reader.Read(decryptedBytes, 0, decryptedBytes.Length);
}
}
cipher.Clear();
}
}
return(decryptedBytes);
}
public static string Decrypt(string card, string salt, string passwd, int bits)
{
try
{
AesManaged AES = new AesManaged();
Rfc2898DeriveBytes rfc = new Rfc2898DeriveBytes(passwd, Encoding.UTF8.GetBytes(salt));
Byte[] Data = Convert.FromBase64String(card);
AES.BlockSize = 128;
AES.KeySize = bits;
AES.Key = rfc.GetBytes(AES.KeySize / 8);
AES.IV = rfc.GetBytes(AES.BlockSize / 8);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, AES.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(Data, 0, Data.Length);
cs.FlushFinalBlock();
cs.Close();
string res = (string)Encoding.UTF8.GetString(ms.ToArray());
ms.Close();
AES.Clear();
return(res);
}
catch (Exception e)
{
return(e.Message.ToString());
}
}
public void EncryptData()
{
using (AesManaged aes = new AesManaged())
{
Rfc2898DeriveBytes rfc2898 = new Rfc2898DeriveBytes(Password,
Encoding.UTF8.GetBytes(SaltValue), 10000);
aes.Key = rfc2898.GetBytes(32);
aes.IV = rfc2898.GetBytes(16);
using (MemoryStream memoryStream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream,
aes.CreateEncryptor(), CryptoStreamMode.Write))
{
//Encrypt Data with created CryptoStream
byte[] secret = Encoding.UTF8.GetBytes(DataToEncrypt);
cryptoStream.Write(secret, 0, secret.Length);
cryptoStream.FlushFinalBlock();
aes.Clear();
//Set values on UI thread
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
EncryptedData = Convert.ToBase64String(memoryStream.ToArray());
});
}
}
}
}
///<summary>Encrypts signature text and returns a base 64 string so that it can go directly into the database.</summary>
public string Encryption(string encrypt)
{
byte[] ecryptBytes = Encoding.UTF8.GetBytes(encrypt);
MemoryStream ms = new MemoryStream();
CryptoStream cs = null;
Aes aes = new AesManaged();
aes.Key = key;
aes.IV = new byte[16];
ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV);
cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write);
cs.Write(ecryptBytes, 0, ecryptBytes.Length);
cs.FlushFinalBlock();
byte[] encryptedBytes = new byte[ms.Length];
ms.Position = 0;
ms.Read(encryptedBytes, 0, (int)ms.Length);
cs.Dispose();
ms.Dispose();
if (aes != null)
{
aes.Clear();
}
return(Convert.ToBase64String(encryptedBytes));
}
public static byte[] Encrypt(byte[] toEncrypt, byte[] key)
{
byte[] results = new byte[0];
try
{
AesManaged tdes = new AesManaged();
tdes.Key = key;
tdes.Mode = CipherMode.ECB;
tdes.Padding = PaddingMode.PKCS7;
ICryptoTransform cTransform = tdes.CreateEncryptor();
byte[] resultArray = cTransform.TransformFinalBlock(toEncrypt, 0, toEncrypt.Length);
tdes.Clear();
results = resultArray;
}
catch
{
throw new Exception("Failed : key invalid");
}
return(results);
}
public string Generate(string name, string email)
{
byte[] keyBytes;
using (AesManaged aesManaged = new AesManaged())
{
byte[] vec = Encoding.UTF8.GetBytes(productVector);
byte[] salt = Encoding.UTF8.GetBytes(productSalt);
byte[] clearText = Encoding.UTF8.GetBytes(name + "|" + email);
PasswordDeriveBytes passwordDeriveBytes = new PasswordDeriveBytes(productSec, salt, "SHA1", 2);
byte[] key = passwordDeriveBytes.GetBytes(32);
aesManaged.Mode = CipherMode.CBC;
using (ICryptoTransform cryptoTransform = aesManaged.CreateEncryptor(key, vec))
{
using (MemoryStream memoryStream = new MemoryStream())
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, cryptoTransform, CryptoStreamMode.Write))
{
cryptoStream.Write(clearText, 0, clearText.Length);
cryptoStream.FlushFinalBlock();
keyBytes = memoryStream.ToArray();
}
}
}
aesManaged.Clear();
}
return(Convert.ToBase64String(keyBytes));
}
public static string Encrypt(string encrypt)
{
UTF8Encoding enc = new UTF8Encoding();
byte[] arrayEncryptBytes = Encoding.UTF8.GetBytes(encrypt);
MemoryStream ms = new MemoryStream();
CryptoStream cs = null;
Aes aes = new AesManaged();
aes.Key = enc.GetBytes("AKQjlLUjlcABVbqp");
aes.IV = new byte[16];
ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV);
cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write);
cs.Write(arrayEncryptBytes, 0, arrayEncryptBytes.Length);
cs.FlushFinalBlock();
byte[] retval = new byte[ms.Length];
ms.Position = 0;
ms.Read(retval, 0, (int)ms.Length);
cs.Dispose();
ms.Dispose();
if (aes != null)
{
aes.Clear();
}
return(Convert.ToBase64String(retval));
}
public static string Encrypt(string plainText, string password)
{
Contract.Requires(!string.IsNullOrWhiteSpace(plainText));
Contract.Requires(!string.IsNullOrWhiteSpace(password));
Contract.Ensures(!string.IsNullOrWhiteSpace(Contract.Result <string>()));
var hashProvider = new SHA256CryptoServiceProvider();
var algorithm = new AesManaged
{
Key = hashProvider.ComputeHash(_utf8.GetBytes(password)),
Mode = CipherMode.ECB,
Padding = PaddingMode.PKCS7
};
try
{
using (var encryptor = algorithm.CreateEncryptor())
{
var abData = _utf8.GetBytes(plainText);
var abResult = encryptor.TransformFinalBlock(abData, 0, abData.Length);
var result = System.Convert.ToBase64String(abResult);
return(result);
}
}
finally
{
algorithm.Clear();
algorithm.Dispose();
hashProvider.Clear();
hashProvider.Dispose();
}
}
/// <summary>
/// AES解密
/// </summary>
/// <param name="decryptStr">待解密的字符串</param>
/// <param name="key">加密密钥,Key是24位</param>
/// <returns>解密成功返回解密后的字符串，失败返源串</returns>
public static string AES_Decrypt(string decryptStr, string key)
{
try
{
Byte[] bKey = new Byte[32];
string str = key.PadRight(bKey.Length);
byte[] keyArray = Encoding.UTF8.GetBytes(str);
Array.Copy(keyArray, bKey, bKey.Length);
byte[] toEncryptArray = Convert.FromBase64String(decryptStr);
var aes = new AesManaged()
{
Mode = CipherMode.ECB,
Padding = PaddingMode.PKCS7,
KeySize = 256,
Key = bKey
};
byte[] resultArray = aes.CreateDecryptor().TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
aes.Clear();
return(Encoding.UTF8.GetString(resultArray));
}
catch (Exception ex)
{
//
Console.WriteLine(ex.Message);
return(decryptStr);
}
}
private byte[] EncryptManaged(byte[] Key, byte[] Vector, byte[] Data)
{
byte[] encryptedBytes;
using (MemoryStream stream = new MemoryStream())
{
using (AesManaged cipher = new AesManaged())
{
cipher.Mode = CipherMode.CBC;
cipher.KeySize = Key.Length * 8;
cipher.BlockSize = Vector.Length * 8;
cipher.IV = Vector;
cipher.Padding = PaddingMode.None;
using (ICryptoTransform encryptor = cipher.CreateEncryptor(Key, Vector))
{
using (CryptoStream writer = new CryptoStream(stream, encryptor, CryptoStreamMode.Write))
{
writer.Write(Data, 0, Data.Length);
writer.FlushFinalBlock();
encryptedBytes = stream.ToArray();
}
}
cipher.Clear();
}
}
return(encryptedBytes);
}
public static string Decrypt(string encString)
{
try {
byte[] encrypted = Convert.FromBase64String(encString);
MemoryStream ms = null;
CryptoStream cs = null;
StreamReader sr = null;
Aes aes = new AesManaged();
UTF8Encoding enc = new UTF8Encoding();
aes.Key = enc.GetBytes("AKQjlLUjlcABVbqp"); //Random string will be key
aes.IV = new byte[16];
ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
ms = new MemoryStream(encrypted);
cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read);
sr = new StreamReader(cs);
string decrypted = sr.ReadToEnd();
ms.Dispose();
cs.Dispose();
sr.Dispose();
if (aes != null)
{
aes.Clear();
}
return(decrypted);
}
catch {
MessageBox.Show("Text entered was not valid encrypted text.");
return("");
}
}
/// <summary>
/// AES加密
/// </summary>
/// <param name="encryptStr">待加密的字符串</param>
/// <param name="key">加密密钥</param>
/// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
public static string AES_Encrypt(string encryptStr, string key)
{
try
{
Byte[] bKey = new Byte[32];
string str = key.PadRight(bKey.Length);
byte[] keyArray = Encoding.UTF8.GetBytes(str);
Array.Copy(keyArray, bKey, bKey.Length);
byte[] toEncryptArray = Encoding.UTF8.GetBytes(encryptStr);
var aes = new AesManaged()
{
Mode = CipherMode.ECB,
Padding = PaddingMode.PKCS7,
KeySize = 256,
Key = bKey
};
var resultArray = aes.CreateEncryptor().TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
aes.Clear();
return(Convert.ToBase64String(resultArray, 0, resultArray.Length));
}
catch (Exception)
{
return(encryptStr);
}
}
public string Encrypt(string value)
{
byte[] vectorBytes = Encoding.ASCII.GetBytes(_vector);
byte[] saltBytes = Encoding.ASCII.GetBytes(_salt);
byte[] valueBytes = Encoding.UTF8.GetBytes(value);
byte[] encrypted;
using (var cipher = new AesManaged())
{
var _passwordBytes = new Rfc2898DeriveBytes(_password, saltBytes, _iterations);
byte[] keyBytes = _passwordBytes.GetBytes(_keySize / 8);
cipher.Mode = CipherMode.CBC;
using (ICryptoTransform encryptor = cipher.CreateEncryptor(keyBytes, vectorBytes))
{
using (var to = new MemoryStream())
{
using (var writer = new CryptoStream(to, encryptor, CryptoStreamMode.Write))
{
writer.Write(valueBytes, 0, valueBytes.Length);
writer.FlushFinalBlock();
encrypted = to.ToArray();
}
}
}
cipher.Clear();
}
return(Convert.ToBase64String(encrypted));
}
public static string Decrypt(string str, byte[] key)
{
//No need to check RemotingRole; no call to db.
if (str == "")
{
return("");
}
try {
byte[] encrypted = Convert.FromBase64String(str);
MemoryStream ms = null;
CryptoStream cs = null;
StreamReader sr = null;
Aes aes = new AesManaged();
aes.Key = key;
aes.IV = new byte[16];
ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
ms = new MemoryStream(encrypted);
cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read);
sr = new StreamReader(cs);
string decrypted = sr.ReadToEnd();
ms.Dispose();
cs.Dispose();
sr.Dispose();
if (aes != null)
{
aes.Clear();
}
return(decrypted);
}
catch {
//MessageBox.Show("Text entered was not valid encrypted text.");
return("");
}
}
///<summary>Encrypts signature text and returns a base 64 string so that it can go directly into the database.</summary>
public static string Encrypt(string str, byte[] key)
{
//No need to check RemotingRole; no call to db.
if (str == "")
{
return("");
}
byte[] ecryptBytes = Encoding.UTF8.GetBytes(str);
MemoryStream ms = new MemoryStream();
CryptoStream cs = null;
Aes aes = new AesManaged();
aes.Key = key;
aes.IV = new byte[16];
ICryptoTransform encryptor = aes.CreateEncryptor(aes.Key, aes.IV);
cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write);
cs.Write(ecryptBytes, 0, ecryptBytes.Length);
cs.FlushFinalBlock();
byte[] encryptedBytes = new byte[ms.Length];
ms.Position = 0;
ms.Read(encryptedBytes, 0, (int)ms.Length);
cs.Dispose();
ms.Dispose();
if (aes != null)
{
aes.Clear();
}
return(Convert.ToBase64String(encryptedBytes));
}
public static string Decrypt(byte[] toEncryptArray, byte[] key)
{
string results = "";
try
{
AesManaged aes = new AesManaged();
aes.Key = key;
aes.Mode = CipherMode.ECB;
aes.Padding = PaddingMode.PKCS7;
ICryptoTransform cTransform = aes.CreateDecryptor();
byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
aes.Clear();
results = Encoding.UTF8.GetString(resultArray);
}
catch
{
throw new Exception("Failed : key invalid");
}
return(results);
}
public static void GenAesKeyPair(ref byte[] key, ref byte[] iv)
{
using (Aes aes = new AesManaged())
{
aes.KeySize = ConfigurationManager.CHIPER_KEY_SIZE;
aes.Mode = ConfigurationManager.CHIPER_MODE;
aes.Padding = ConfigurationManager.CHIPER_PADDING_MODE;
aes.GenerateIV();
aes.GenerateKey();
byte[] volatileKey = aes.Key;
byte[] volatileIv = aes.IV;
key = new byte[volatileKey.Length];
iv = new byte[volatileIv.Length];
Array.Copy(volatileKey, key, volatileKey.Length);
Array.Copy(volatileIv, iv, volatileIv.Length);
Common.ClearArray(ref volatileKey);
Common.ClearArray(ref volatileIv);
aes.Clear();
}
}
/// <summary>
/// Encrypt the plaintext string with the given passphrase and returns the
/// encrypted string in base64 format.
/// </summary>
/// <param name="plainText">The string to be encrypted</param>
/// <param name="passPhrase">The passphrase to use in the encryption</param>
/// <returns>The encrypted string</returns>
internal static string Encrypt(string plainText, string passPhrase)
{
AesManaged aes = null;
MemoryStream memoryStream = null;
CryptoStream cryptoStream = null;
byte[] cipherTextBytes;
try
{
byte[] salt1 = new byte[SaltLength];
using (RNGCryptoServiceProvider rngCsp = new RNGCryptoServiceProvider())
{
rngCsp.GetBytes(salt1);
}
Rfc2898DeriveBytes rfc2898 = new Rfc2898DeriveBytes(passPhrase, salt1, 10000);
// Create AES algorithm
aes = new AesManaged
{
Key = rfc2898.GetBytes(32),
IV = rfc2898.GetBytes(16)
};
// Create Memory and Crypto Streams
memoryStream = new MemoryStream();
cryptoStream = new CryptoStream(memoryStream, aes.CreateEncryptor(), CryptoStreamMode.Write);
// Encrypt Data
byte[] data = Encoding.UTF8.GetBytes(plainText);
cryptoStream.Write(data, 0, data.Length);
cryptoStream.FlushFinalBlock();
byte[] encryptionStream = memoryStream.ToArray();
// Append the salt to the end of the encrypted string
cipherTextBytes = new byte[encryptionStream.Length + salt1.Length];
Buffer.BlockCopy(encryptionStream, 0, cipherTextBytes, 0, encryptionStream.Length);
Buffer.BlockCopy(salt1, 0, cipherTextBytes, encryptionStream.Length, salt1.Length);
}
finally
{
if (cryptoStream != null)
{
cryptoStream.Close();
memoryStream = null; // Because CryptoStream will dispose of it.
}
if (memoryStream != null)
{
memoryStream.Close();
}
if (aes != null)
{
aes.Clear();
}
}
return(Convert.ToBase64String(cipherTextBytes));
}
public static string Decrypt(string dataToDecrypt)
{
AesManaged aes = null;
MemoryStream memoryStream = null;
try
{
//Generate a Key based on a Password and HMACSHA1 pseudo-random number generator
//Salt must be at least 8 bytes long
//Use an iteration count of at least 1000
Rfc2898DeriveBytes rfc2898 = new Rfc2898DeriveBytes(Password, Encoding.UTF8.GetBytes(Salt), 10000);
//Create AES algorithm
aes = new AesManaged();
//Key derived from byte array with 32 pseudo-random key bytes
aes.Key = rfc2898.GetBytes(32);
//IV derived from byte array with 16 pseudo-random key bytes
aes.IV = rfc2898.GetBytes(16);
//Create Memory and Crypto Streams
memoryStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memoryStream, aes.CreateDecryptor(), CryptoStreamMode.Write);
//Decrypt Data
byte[] data = Convert.FromBase64String(dataToDecrypt);
cryptoStream.Write(data, 0, data.Length);
cryptoStream.FlushFinalBlock();
//Return Decrypted String
byte[] decryptBytes = memoryStream.ToArray();
//Dispose
if (cryptoStream != null)
{
cryptoStream.Dispose();
}
//Retval
return(Encoding.UTF8.GetString(decryptBytes, 0, decryptBytes.Length));
}
catch (Exception ex)
{
return(null);
}
finally
{
if (memoryStream != null)
{
memoryStream.Dispose();
}
if (aes != null)
{
aes.Clear();
}
}
}
/// <summary>
/// Decrypt the given string. Assumes the string was encrypted using
/// EncryptStringAES(), using an identical sharedSecret.
/// </summary>
/// <param name="cipherText">The text to decrypt.</param>
/// <param name="sharedSecret">A password used to generate a key for decryption.</param>
public static string DecryptStringAES(string cipherText, string sharedSecret)
{
if (string.IsNullOrEmpty(cipherText))
{
throw new ArgumentNullException("cipherText");
}
if (string.IsNullOrEmpty(sharedSecret))
{
throw new ArgumentNullException("sharedSecret");
}
// Declare the RijndaelManaged object
// used to decrypt the data.
AesManaged aesAlg = null;
// Declare the string used to hold
// the decrypted text.
string plaintext = null;
try
{
// generate the key from the shared secret and the salt
Rfc2898DeriveBytes key = new Rfc2898DeriveBytes(sharedSecret, _salt);
// Create a RijndaelManaged object
// with the specified key and IV.
aesAlg = new AesManaged();
aesAlg.Key = key.GetBytes(aesAlg.KeySize / 8);
aesAlg.IV = key.GetBytes(aesAlg.BlockSize / 8);
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
// Create the streams used for decryption.
byte[] bytes = Convert.FromBase64String(cipherText);
using (MemoryStream msDecrypt = new MemoryStream(bytes))
{
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();
}
}
}
finally
{
// Clear the RijndaelManaged object.
if (aesAlg != null)
{
aesAlg.Clear();
}
}
return(plaintext);
}