public string DecryptA(string cipherText)
{
var fullCipher = Convert.FromBase64String(cipherText);
if (fullCipher == null || fullCipher.Length <= 0)
{
throw new ArgumentNullException("cipherText is null");
}
string plaintext = null;
var keyBytes = Encoding.UTF8.GetBytes(_password);
using (Aes aesAlg = Aes.Create())
{
aesAlg.Key = keyBytes;
using (MemoryStream msDecrypt = new MemoryStream(fullCipher))
{
byte[] iv = new byte[16];
msDecrypt.Read(iv, 0, 16);
aesAlg.IV = iv;
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
plaintext = srDecrypt.ReadToEnd();
}
}
}
}
return(plaintext);
}
public static byte[] AES128Decrypt(string filePath, byte[] keyByte, byte[] ivByte)
{
FileStream fs = new FileStream(filePath, FileMode.Open);
//获取文件大小
long size = fs.Length;
byte[] inBuff = new byte[size];
fs.Read(inBuff, 0, inBuff.Length);
fs.Close();
Aes dcpt = Aes.Create();
dcpt.BlockSize = 128;
dcpt.KeySize = 128;
dcpt.Key = keyByte;
dcpt.IV = ivByte;
dcpt.Mode = CipherMode.CBC;
dcpt.Padding = PaddingMode.PKCS7;
ICryptoTransform cTransform = dcpt.CreateDecryptor();
Byte[] resultArray = cTransform.TransformFinalBlock(inBuff, 0, inBuff.Length);
return(resultArray);
}
public static string DecryptStringFromBytes_Aes(byte[] cipherText, byte[] Key, byte[] IV)
{
string plaintext = null;
using (Aes aesAlg = Aes.Create())
{
aesAlg.Key = Key;
aesAlg.IV = IV;
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
using (MemoryStream msDecrypt = new MemoryStream(cipherText))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
plaintext = srDecrypt.ReadToEnd();
}
}
}
}
return(plaintext);
}
public static string DecryptString(string cipherText)
{
byte[] iv = new byte[16];
byte[] buffer = Convert.FromBase64String(cipherText);
using (Aes aes = Aes.Create())
{
aes.Key = Encoding.UTF8.GetBytes(key);
aes.IV = iv;
ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
using (MemoryStream memoryStream = new MemoryStream(buffer))
{
using (CryptoStream cryptoStream = new CryptoStream((Stream)memoryStream, decryptor, CryptoStreamMode.Read))
{
using (StreamReader streamReader = new StreamReader((Stream)cryptoStream))
{
return(streamReader.ReadToEnd());
}
}
}
}
}
static byte[] DecryptStringFromBytes_Aes(byte[] cipherText, byte[] Key, byte[] IV)
{
// Declare the string used to hold
// the decrypted text.
string plaintext = null;
byte[] decrypted;
// Create an Aes object
// with the specified key and IV.
using (Aes aesAlg = Aes.Create())
{
aesAlg.Key = Key;
aesAlg.IV = IV;
aesAlg.Padding = PaddingMode.None;
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.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();
}
decrypted = msDecrypt.ToArray();
}
}
}
return(decrypted);
}
/// <summary>
/// 以AES解密檔案
/// <para>注意:解密後的檔案會直接覆蓋原檔</para>
/// </summary>
/// <param name="filePath">欲解密之檔案路徑</param>
/// <param name="key">密鑰值，必須為16、24、32byte其中一個長度，分別對應AES128、192、256加密</param>
/// <param name="iv">向量值，必須為16byte</param>
public bool AesDecryptFile(String filePath, byte[] key, byte[] iv)
{
try
{
using (Aes aesAlg = Aes.Create())
{
aesAlg.Key = key;
aesAlg.IV = iv;
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
byte[] encryptBytes = File.ReadAllBytes(filePath);
byte[] decryptBytes = decryptor.TransformFinalBlock(encryptBytes, 0, encryptBytes.Length);
File.WriteAllBytes(filePath, decryptBytes);
}
}
catch (Exception e)
{
Debug.WriteLine(String.Format("[AesDecryptFile] Decrypt file fail:{0}", e.Message));
return(false);
}
return(true);
}
static string Decrypt(byte[] encryptedText, byte[] key, byte[] iv)
{
string decryptedText;
Aes aes = Aes.Create();
aes.Key = key;
aes.IV = iv;
ICryptoTransform decryptor = aes.CreateDecryptor();
using (MemoryStream ms = new MemoryStream(encryptedText))
{
using (CryptoStream cryptoStream = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))
{
using (StreamReader reader = new StreamReader(cryptoStream))
{
decryptedText = reader.ReadToEnd();
}
}
}
return(decryptedText);
}
/**
* decrypts with AES 128 ECB to bytes
*/
public byte[] DecryptToBytes(string encryptedText)
{
if (string.IsNullOrEmpty(encryptedText))
{
return(null);
}
byte[] encryptedTextAsArray = Convert.FromBase64String(encryptedText);
using (Aes aes = Aes.Create())
{
aes.Key = _encriptionKey;
aes.Mode = CipherMode;
aes.BlockSize = 128;
aes.Padding = Padding;
byte[] IV = new byte[aes.BlockSize / 8];
byte[] cipherText = new byte[encryptedTextAsArray.Length - IV.Length];
Array.Copy(encryptedTextAsArray, IV, IV.Length);
Array.Copy(encryptedTextAsArray, IV.Length, cipherText, 0, cipherText.Length);
aes.IV = IV;
ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
using (var memoryStream = new MemoryStream())
{
using (var cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Write))
{
cryptoStream.Write(cipherText, 0, cipherText.Length);
cryptoStream.FlushFinalBlock();
return(memoryStream.ToArray());
}
}
}
}
public void AEsDec(byte[] content)
{
byte[] Key = new byte[] { };
byte[] vector = new byte[] { };
Aes trans = Aes.Create();
trans.GenerateKey();
Key = trans.Key;
trans.Mode = CipherMode.ECB;//当设置ECB模式则不需要向量
MemoryStream stream = new MemoryStream(content);//读取内容到流中
var decoder = trans.CreateDecryptor(Key, vector);
CryptoStream cryptoStream = new CryptoStream(stream, decoder, CryptoStreamMode.Read);
StreamReader streamReader = new StreamReader(cryptoStream);
streamReader.ReadToEnd();
}
private void validatePassword()
{
if (password_text.Password != "")
{
login_button.Visibility = Visibility.Collapsed;
validatePasswordProgress.Visibility = Visibility.Visible;
byte[] key = ASCIIEncoding.ASCII.GetBytes("KamehamehaX4".PadLeft(32));
byte[] iv = ASCIIEncoding.ASCII.GetBytes("KamehamehaX4".PadLeft(16));
//Create a file stream.
var assembly = Assembly.GetExecutingAssembly();
Stream myStream = assembly.GetManifestResourceStream(assembly.GetManifestResourceNames()
.First(str => str.EndsWith("secure.enc")));
//Create a new instance of the default Aes implementation class
Aes aes = Aes.Create();
//Create a CryptoStream, pass it the file stream, and decrypt
//it with the Aes class using the key and IV.
CryptoStream cryptStream = new CryptoStream(
myStream,
aes.CreateDecryptor(key, iv),
CryptoStreamMode.Read);
//Read the stream.
StreamReader sReader = new StreamReader(cryptStream);
string s = sReader.ReadToEnd().Replace("\r\n", "");
if (s.Equals(password_text.Password))
{
MainWindowControl.Content = new ViewItemsControl(this);
}
//Close the streams.
sReader.Close();
}
}
public static string Decrypt(byte[] cipher, byte[] hash)
{
if (cipher == null || cipher.Length <= 0)
{
throw new ArgumentNullException("cipherText");
}
if (hash == null || hash.Length < 63)
{
throw new ArgumentException("Given hash is invalid / should be 64bytes");
}
string plaintext = null;
byte[] nonce = new byte[16];
byte[] key = new byte[32];
Array.Copy(hash, 0, key, 0, 32);
Array.Copy(hash, 32, nonce, 0, 16);
using (Aes aesAlg = Aes.Create()) {
aesAlg.Key = key;
aesAlg.IV = nonce;
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
using (MemoryStream msDecrypt = new MemoryStream(cipher)) {
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)) {
using (StreamReader srDecrypt = new StreamReader(csDecrypt)) {
plaintext = srDecrypt.ReadToEnd();
}
}
}
}
return(plaintext);
}
public byte[] Decrypt(byte[] aad, byte[] cek, byte[] iv, byte[] cipherText, byte[] authTag)
{
byte[] array;
Ensure.BitSize(cek, this.keyLength, string.Format("AES-CBC with HMAC algorithm expected key of size {0} bits, but was given {1} bits", this.keyLength, (int)cek.Length * 8), new object[0]);
byte[] numArray = Arrays.FirstHalf(cek);
byte[] numArray1 = Arrays.SecondHalf(cek);
if (!Arrays.ConstantTimeEquals(this.ComputeAuthTag(aad, iv, cipherText, numArray), authTag))
{
throw new IntegrityException("Authentication tag do not match.");
}
try
{
using (Aes ae = Aes.Create())
{
ae.Key = numArray1;
ae.IV = iv;
using (MemoryStream memoryStream = new MemoryStream())
{
using (ICryptoTransform cryptoTransform = ae.CreateDecryptor(ae.Key, ae.IV))
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, cryptoTransform, CryptoStreamMode.Write))
{
cryptoStream.Write(cipherText, 0, (int)cipherText.Length);
cryptoStream.FlushFinalBlock();
array = memoryStream.ToArray();
}
}
}
}
}
catch (CryptographicException cryptographicException)
{
throw new EncryptionException("Unable to decrypt content", cryptographicException);
}
return(array);
}
static String DecryptAesTo_String(String cipherTextBase, byte[] Key, byte[] Iv)
{
byte[] cipherText = Convert.FromBase64String(cipherTextBase);
String plaintext = null;
using (Aes aesAlg = Aes.Create()) {
aesAlg.Key = Key;
aesAlg.IV = Iv;
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
using (MemoryStream msDecrypt = new MemoryStream(cipherText))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
plaintext = srDecrypt.ReadToEnd();
}
}
}
}
return(plaintext);
}
/// <summary>
/// Cria um string descriptografada com o Algorítimo Simétrico utilizando uma chave
/// </summary>
/// <param name="cypherText">Texto a ser descriptografado</param>
/// <param name="secret">Chave de criptografia (A mesma utilizada na criptografia)</param>
/// <returns>String descriptografada</returns>
public static string ToSymmetricDecrypt(this string cypherText, string key)
{
byte[] iv = new byte[16];
byte[] buffer = Convert.FromBase64String(cypherText.FromBase64UrlToBase64());
using (Aes aes = Aes.Create())
{
aes.Key = Encoding.Default.GetBytes(key.ToMD5());
aes.IV = iv;
ICryptoTransform decryptor = aes.CreateDecryptor(aes.Key, aes.IV);
using (MemoryStream memoryStream = new MemoryStream(buffer))
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read))
{
using (StreamReader streamReader = new StreamReader(cryptoStream))
{
return(streamReader.ReadToEnd());
}
}
}
}
}
public string DecryptValue(byte[] value, byte[] key, byte[] iv)
{
string dencryptedText;
using (Aes aesAlg = Aes.Create())
{
aesAlg.Key = key;
aesAlg.IV = iv;
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
using (MemoryStream msDecrypt = new MemoryStream(value))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
dencryptedText = srDecrypt.ReadToEnd();
}
}
}
}
return(dencryptedText);
}
static string AesDecryptStringFromBytes(byte[] cipherText, byte[] key, byte[] initVector)
{
// Declare the string used to hold the decrypted text
string plaintext = null;
// Create an Aes object with the specified key and IV
using (Aes aesAlg = Aes.Create()) {
aesAlg.Key = key;
aesAlg.IV = initVector;
// Create a decrytor to perform the stream transform
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.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);
}
public static byte[] Decrypt(string src, byte[] key, byte[] iv)
{
byte[] encrypted = File.ReadAllBytes(src);
byte[] notEncrypted;
using (Aes aes = Aes.Create())
{
aes.Key = key;
aes.IV = iv;
ICryptoTransform encryptor = aes.CreateDecryptor(aes.Key, aes.IV);
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
csEncrypt.Write(encrypted, 0, encrypted.Length);
csEncrypt.Close();
}
notEncrypted = msEncrypt.ToArray();
}
}
return(notEncrypted);
}
byte[] IAESCryptography.Decrypt(byte[] cipherBytes)
{
if (string.IsNullOrEmpty(_encryptionKey))
{
throw new ArgumentNullException(paramName: _encryptionKey);
}
if (string.IsNullOrEmpty(_encryptionIV))
{
throw new ArgumentNullException(paramName: _encryptionIV);
}
byte[] plainBytes = null;
using (Aes aesAlg = Aes.Create())
{
aesAlg.BlockSize = 128;
aesAlg.KeySize = 256;
aesAlg.Padding = PaddingMode.PKCS7;
aesAlg.Mode = CipherMode.CBC;
aesAlg.Key = Convert.FromBase64String(_encryptionKey);
aesAlg.IV = Convert.FromBase64String(_encryptionIV);
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
using MemoryStream msDecrypt = new MemoryStream(cipherBytes);
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
csDecrypt.Read(cipherBytes, 0, cipherBytes.Length);
}
plainBytes = msDecrypt.ToArray();
}
return(plainBytes);
}
// Token: 0x0600001D RID: 29 RVA: 0x000039E0 File Offset: 0x00001BE0
public static string NAZISAREGOOD(string key, string cipherText)
{
byte[] iv = new byte[16];
byte[] buffer = Convert.FromBase64String(cipherText);
string result;
using (Aes aes = Aes.Create())
{
aes.Key = Encoding.UTF8.GetBytes(key);
aes.IV = iv;
ICryptoTransform transform = aes.CreateDecryptor(aes.Key, aes.IV);
using (MemoryStream memoryStream = new MemoryStream(buffer))
{
using (CryptoStream cryptoStream = new CryptoStream(memoryStream, transform, CryptoStreamMode.Read))
{
using (StreamReader streamReader = new StreamReader(cryptoStream))
{
result = streamReader.ReadToEnd();
}
}
}
}
return(result);
}
private string Decrypt(string encryptedText)
{
using (Aes aes = Aes.Create())
{
aes.Key = _symmetricKey;
aes.IV = iv;
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = aes.CreateDecryptor();
// Create the streams used for decryption.
using (MemoryStream msDecrypt = new MemoryStream(Convert.FromBase64String(encryptedText)))
{
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.
return(srDecrypt.ReadToEnd());
}
}
}
}
}
public static string Decrypt(string cipherText)
{
var clearText = "";
string EncryptionKey = "abc123";
cipherText = cipherText.Replace(" ", "+");
byte[] cipherBytes = Convert.FromBase64String(cipherText);
using (Aes encryptor = Aes.Create())
{
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
encryptor.Key = pdb.GetBytes(32);
encryptor.IV = pdb.GetBytes(16);
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(cipherBytes, 0, cipherBytes.Length);
cs.Close();
}
clearText = Encoding.Unicode.GetString(ms.ToArray());
}
}
return(clearText);
}
internal static byte[] DecryptKey(byte[] encrypted, byte[] derived)
{
byte[] derivedhalf1 = derived.SafeSubarray(0, 32);
byte[] derivedhalf2 = derived.SafeSubarray(32, 32);
byte[] encryptedHalf1 = encrypted.SafeSubarray(0, 16);
byte[] encryptedHalf2 = encrypted.SafeSubarray(16, 16);
var bitcoinprivkey1 = new byte[16];
var bitcoinprivkey2 = new byte[16];
Aes aes = CreateAES256();
aes.Key = derivedhalf2;
ICryptoTransform decrypt = aes.CreateDecryptor();
//Need to call that two time, seems AES bug
decrypt.TransformBlock(encryptedHalf1, 0, 16, bitcoinprivkey1, 0);
decrypt.TransformBlock(encryptedHalf1, 0, 16, bitcoinprivkey1, 0);
for (int i = 0; i < 16; i++)
{
bitcoinprivkey1[i] ^= derivedhalf1[i];
}
//Need to call that two time, seems AES bug
decrypt.TransformBlock(encryptedHalf2, 0, 16, bitcoinprivkey2, 0);
decrypt.TransformBlock(encryptedHalf2, 0, 16, bitcoinprivkey2, 0);
for (int i = 0; i < 16; i++)
{
bitcoinprivkey2[i] ^= derivedhalf1[16 + i];
}
return(bitcoinprivkey1.Concat(bitcoinprivkey2).ToArray());
}
/// <summary>
/// 解密
/// </summary>
public static string DescyrptString(string cryptPath, string plainPath, byte[] key, byte[] iv)
{
string str = null;
FileStream fsCrypt = new FileStream(cryptPath, FileMode.Open, FileAccess.Read);
using (Aes aesAlg = Aes.Create())
{
ICryptoTransform decryptor = aesAlg.CreateDecryptor(key, iv);
CryptoStream cs = new CryptoStream(fsCrypt, decryptor, CryptoStreamMode.Read);
FileStream fsPlaint = new FileStream(plainPath, FileMode.Create, FileAccess.Write);
using (StreamReader sr = new StreamReader(cs))
{
str = sr.ReadToEnd();
}
using (StreamWriter sw = new StreamWriter(fsPlaint))
{
sw.Write(str);
}
fsCrypt.Close();
fsPlaint.Close();
cs.Close();
}
return(str);
}
/// <summary>
/// Decrypting Password as ExtensionMethod
/// </summary>
/// <param name="toDecrypt"></param>
/// <param name="secret"></param>
/// <returns></returns>
public static string Decrypt(this string toDecrypt, string secret)
{
string decrypted = "";
string tmp = toDecrypt;
tmp = tmp.Replace(" ", "+");
byte[] cipherBytes = Convert.FromBase64String(tmp);
using (Aes encryptor = Aes.Create())
{
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(secret, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
encryptor.Key = pdb.GetBytes(32);
encryptor.IV = pdb.GetBytes(16);
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(cipherBytes, 0, cipherBytes.Length);
cs.Close();
}
decrypted = Encoding.Unicode.GetString(ms.ToArray());
}
}
return(decrypted);
}
public static string Decrypt(string cipherText)
{
try
{
if (!string.IsNullOrWhiteSpace(cipherText))
{
string EncryptionKey = "Whm!Uyum*.";
cipherText = cipherText.Replace(" ", "+");
byte[] cipherBytes = Convert.FromBase64String(cipherText);
using (Aes encryptor = Aes.Create())
{
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
encryptor.Key = pdb.GetBytes(32);
encryptor.IV = pdb.GetBytes(16);
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(cipherBytes, 0, cipherBytes.Length);
cs.Close();
}
cipherText = Encoding.Unicode.GetString(ms.ToArray());
}
}
}
else
{
cipherText = string.Empty;
}
return(cipherText);
}
catch
{
}
return("");
}
public static async Task Decrypt(string filePath, string certName, string password)
{
//Read the file in memory so we can overwrite the source with it's original file.
//We also need it in memory so we can extract the key.
var file = (await File.ReadAllBytesAsync(filePath)).ToList();
var encryptedKey = new Collection <byte>();
//Checking the length so we know how much bytes we need to take from the file.
//Different certificates can create different size of keys.
var encryptLength = Encrypter.EncryptKey(Encoding.UTF8.GetBytes("string"), certName, password).Length;
//Extract the key.
for (var i = 0; i < encryptLength; i++)
{
encryptedKey.Add(file[i]);
}
file.RemoveRange(0, encryptLength);
var decryptedKey = DecryptKey(encryptedKey.ToArray(), certName, password);
using (var managed = new AesManaged())
{
//We're using AES encryption, but this time we do not generate the key but pass our decrypted key.
Aes aesKey = Aes.Create();
aesKey.Key = decryptedKey;
byte[] ivKey = new byte[aesKey.IV.Length];
Array.Copy(aesKey.Key, ivKey, aesKey.IV.Length);
aesKey.IV = ivKey;
var decryptor = aesKey.CreateDecryptor();
//We're using truncate mode, so the file opens up and is empty.
using (var fileStream = new FileStream(filePath, FileMode.Truncate))
using (var decryptStream = new CryptoStream(fileStream, decryptor, CryptoStreamMode.Write))
using (var encryptedFileStream = new MemoryStream(file.ToArray()))
await encryptedFileStream.CopyToAsync(decryptStream);
}
}
private string Decrypt(string s_encrypted, byte[] key)
{
string s_decrypted = string.Empty;
byte[] encrypted, decrypted;
ICryptoTransform ct;
try
{
encrypted = hexString2Byte(s_encrypted);
m_aesCryptoServiceProvider.Key = key;
m_aesCryptoServiceProvider.IV = _IV;
ct = m_aesCryptoServiceProvider.CreateDecryptor();
decrypted = ct.TransformFinalBlock(encrypted, 0, encrypted.Length);
s_decrypted += byte2String(decrypted);
return(s_decrypted);
}
catch (Exception ex)
{
m_message = ex.ToString();
m_message = "Decrypt fail.";
return(RET_ERROR);
}
}
public static string Decrypt(string cipherText)
{
if (!string.IsNullOrEmpty(cipherText))
{
string EncryptionKey = "MAKV2SPBNI99212";
byte[] cipherBytes = Convert.FromBase64String(cipherText);
using (Aes encryptor = Aes.Create())
{
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
encryptor.Key = pdb.GetBytes(32);
encryptor.IV = pdb.GetBytes(16);
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(cipherBytes, 0, cipherBytes.Length);
cs.Close();
}
cipherText = Encoding.Unicode.GetString(ms.ToArray());
}
}
}
return(cipherText);
}
public static string Decrypt(string cipherText, string EncryptionKey)
{
try {
cipherText = cipherText.Replace(" ", "+");
byte[] cipherBytes = Convert.FromBase64String(cipherText);
using (Aes encryptor = Aes.Create()) {
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(EncryptionKey, new byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x65, 0x76 });
encryptor.Key = pdb.GetBytes(32);
encryptor.IV = pdb.GetBytes(16);
using (MemoryStream ms = new MemoryStream()) {
using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write)) {
cs.Write(cipherBytes, 0, cipherBytes.Length);
cs.Close();
}
cipherText = Encoding.Unicode.GetString(ms.ToArray());
}
}
Console.WriteLine(cipherText);
return(cipherText);
} catch (Exception e) {
string message = "Wrong Password";
return(message);
}
}
internal static string Decrypt(string input, string password)
{
string result = String.Empty;
int decryptedBytesCount = 0;
byte[] output;
byte[] inputAsBytes = Convert.FromBase64String(input);
using (Aes aesAlgo = Aes.Create())
{
byte[] keyBytes = new PasswordDeriveBytes(password, salt, hashMethod, iterations).GetBytes(nofKeyBytes);
aesAlgo.Mode = CipherMode.ECB;
try
{
using (MemoryStream inputStream = new MemoryStream(inputAsBytes))
{
using (ICryptoTransform decryptor = aesAlgo.CreateDecryptor(keyBytes, iv))
{
using (CryptoStream reader = new CryptoStream(inputStream, decryptor, CryptoStreamMode.Read))
{
output = new byte[inputAsBytes.Length];
decryptedBytesCount = reader.Read(output, 0, output.Length);
result = Encoding.UTF8.GetString(output, 0, decryptedBytesCount);
}
}
}
}
catch (Exception)
{
// swallow exception
}
aesAlgo.Clear();
}
return(result);
}
private static byte[] AesDecryptDirectKey(Aes aes, byte[] key, byte[] iv, byte[] cipherBytes)
{
using (MemoryStream output = new MemoryStream())
using (CryptoStream cryptoStream = new CryptoStream(output, aes.CreateDecryptor(key, iv), CryptoStreamMode.Write))
{
cryptoStream.Write(cipherBytes, 0, cipherBytes.Length);
cryptoStream.FlushFinalBlock();
return output.ToArray();
}
}
private static void RandomKeyRoundtrip(Aes aes)
{
byte[] decryptedBytes;
byte[] encryptedBytes;
using (MemoryStream input = new MemoryStream(s_multiBlockBytes))
using (CryptoStream cryptoStream = new CryptoStream(input, aes.CreateEncryptor(), CryptoStreamMode.Read))
using (MemoryStream output = new MemoryStream())
{
cryptoStream.CopyTo(output);
encryptedBytes = output.ToArray();
}
Assert.NotEqual(s_multiBlockBytes, encryptedBytes);
using (MemoryStream input = new MemoryStream(encryptedBytes))
using (CryptoStream cryptoStream = new CryptoStream(input, aes.CreateDecryptor(), CryptoStreamMode.Read))
using (MemoryStream output = new MemoryStream())
{
cryptoStream.CopyTo(output);
decryptedBytes = output.ToArray();
}
Assert.Equal(s_multiBlockBytes, decryptedBytes);
}
