在 C # 中使用 AES 加密

我似乎找不到一个使用 AES 128位加密的干净的例子。

有人有样本代码吗？

461905 次浏览
小开

如果您只想使用内置的加密提供程序 RijndaelManaged，请查看以下帮助文章(它还有一个简单的代码示例) :

Http://msdn.microsoft.com/en-us/library/system.security.cryptography.rijndaelmanaged.aspx

And just in case you need the sample in a hurry, here it is in all its plagiarized glory:

using System;
using System.IO;
using System.Security.Cryptography;


namespace RijndaelManaged_Example
{
class RijndaelExample
{
public static void Main()
{
try
{


string original = "Here is some data to encrypt!";


// Create a new instance of the RijndaelManaged
// class.  This generates a new key and initialization
// vector (IV).
using (RijndaelManaged myRijndael = new RijndaelManaged())
{


myRijndael.GenerateKey();
myRijndael.GenerateIV();
// Encrypt the string to an array of bytes.
byte[] encrypted = EncryptStringToBytes(original, myRijndael.Key, myRijndael.IV);


// Decrypt the bytes to a string.
string roundtrip = DecryptStringFromBytes(encrypted, myRijndael.Key, myRijndael.IV);


//Display the original data and the decrypted data.
Console.WriteLine("Original:   {0}", original);
Console.WriteLine("Round Trip: {0}", roundtrip);
}


}
catch (Exception e)
{
Console.WriteLine("Error: {0}", e.Message);
}
}
static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
{
// Check arguments.
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("IV");
byte[] encrypted;
// Create an RijndaelManaged object
// with the specified key and IV.
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.IV = IV;


// Create a decryptor to perform the stream transform.
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);


// Create the streams used for encryption.
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{


//Write all data to the stream.
swEncrypt.Write(plainText);
}
encrypted = msEncrypt.ToArray();
}
}
}




// Return the encrypted bytes from the memory stream.
return encrypted;


}


static string DecryptStringFromBytes(byte[] cipherText, byte[] Key, byte[] IV)
{
// Check arguments.
if (cipherText == null || cipherText.Length <= 0)
throw new ArgumentNullException("cipherText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("IV");


// Declare the string used to hold
// the decrypted text.
string plaintext = null;


// Create an RijndaelManaged object
// with the specified key and IV.
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.IV = IV;


// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.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;


}
}
}
小开

使用 AES 还是实现 AES? 要使用 AES，可以使用 System.Security.Cryptography. RijndaelManaged 类。

小开

有关除 AES 加密外执行密钥派生的更完整示例，请参见 让 AES 加密跨 Javascript 和 C # 工作中公布的答案和链接。

剪辑
值得一读。

小开

看看这里的样本。

Http://msdn.microsoft.com/en-us/library/system.security.cryptography.rijndaelmanaged(v=vs.100).aspx#y2262

MSDN 上的示例不能正常运行(出现错误) ，因为有 初始向量(iv)和 钥匙的 没有初始值。我添加2行代码，现在正常工作。

More details see below:

using System.Windows.Forms;
using System;
using System.Text;
using System.IO;
using System.Security.Cryptography;


namespace AES_TESTER
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}


private void Form1_Load(object sender, EventArgs e)
{
try
{


string original = "Here is some data to encrypt!";
MessageBox.Show("Original:   " + original);


// Create a new instance of the RijndaelManaged
// class.  This generates a new key and initialization
// vector (IV).
using (RijndaelManaged myRijndael = new RijndaelManaged())
{
myRijndael.GenerateKey();
myRijndael.GenerateIV();


// Encrypt the string to an array of bytes.
byte[] encrypted = EncryptStringToBytes(original, myRijndael.Key, myRijndael.IV);


StringBuilder s = new StringBuilder();
foreach (byte item in encrypted)
{
s.Append(item.ToString("X2") + " ");
}
MessageBox.Show("Encrypted:   " + s);


// Decrypt the bytes to a string.
string decrypted = DecryptStringFromBytes(encrypted, myRijndael.Key, myRijndael.IV);


//Display the original data and the decrypted data.
MessageBox.Show("Decrypted:    " + decrypted);
}


}
catch (Exception ex)
{
MessageBox.Show("Error: {0}", ex.Message);
}
}


static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
{
// Check arguments.
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
byte[] encrypted;
// Create an RijndaelManaged object
// with the specified key and IV.
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
rijAlg.Mode = CipherMode.CBC;
rijAlg.Padding = PaddingMode.Zeros;


// Create a decrytor to perform the stream transform.
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);


// Create the streams used for encryption.
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{


//Write all data to the stream.
swEncrypt.Write(plainText);
}
encrypted = msEncrypt.ToArray();
}
}
}




// Return the encrypted bytes from the memory stream.
return encrypted;


}


static string DecryptStringFromBytes(byte[] cipherText, byte[] Key, byte[] IV)
{
// Check arguments.
if (cipherText == null || cipherText.Length <= 0)
throw new ArgumentNullException("cipherText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");


// Declare the string used to hold
// the decrypted text.
string plaintext = null;


// Create an RijndaelManaged object
// with the specified key and IV.
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
rijAlg.Mode = CipherMode.CBC;
rijAlg.Padding = PaddingMode.Zeros;


// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.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;
}
}
}
小开

Try this code, maybe useful.
1. 创建新的 C # 项目，并将以下代码添加到 Form1:

using System;
using System.Windows.Forms;
using System.Security.Cryptography;


namespace ExampleCrypto
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}


private void Form1_Load(object sender, EventArgs e)
{
string strOriginalData = string.Empty;
string strEncryptedData = string.Empty;
string strDecryptedData = string.Empty;


strOriginalData = "this is original data 1234567890"; // your original data in here
MessageBox.Show("ORIGINAL DATA:\r\n" + strOriginalData);


clsCrypto aes = new clsCrypto();
aes.IV = "this is your IV";     // your IV
aes.KEY = "this is your KEY";    // your KEY
strEncryptedData = aes.Encrypt(strOriginalData, CipherMode.CBC);    // your cipher mode
MessageBox.Show("ENCRYPTED DATA:\r\n" + strEncryptedData);


strDecryptedData = aes.Decrypt(strEncryptedData, CipherMode.CBC);
MessageBox.Show("DECRYPTED DATA:\r\n" + strDecryptedData);
}


}
}

2.创建 clsCrypto.cs 并复制粘贴到类中的代码并运行代码。我使用 MD5生成 AES 的初始矢量(IV)和 KEY。

using System;
using System.Security.Cryptography;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Runtime.Remoting.Metadata.W3cXsd2001;


namespace ExampleCrypto
{
public class clsCrypto
{
private string _KEY = string.Empty;
protected internal string KEY
{
get
{
return _KEY;
}
set
{
if (!string.IsNullOrEmpty(value))
{
_KEY = value;
}
}
}


private string _IV = string.Empty;
protected internal string IV
{
get
{
return _IV;
}
set
{
if (!string.IsNullOrEmpty(value))
{
_IV = value;
}
}
}


private string CalcMD5(string strInput)
{
string strOutput = string.Empty;
if (!string.IsNullOrEmpty(strInput))
{
try
{
StringBuilder strHex = new StringBuilder();
using (MD5 md5 = MD5.Create())
{
byte[] bytArText = Encoding.Default.GetBytes(strInput);
byte[] bytArHash = md5.ComputeHash(bytArText);
for (int i = 0; i < bytArHash.Length; i++)
{
strHex.Append(bytArHash[i].ToString("X2"));
}
strOutput = strHex.ToString();
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
return strOutput;
}


private byte[] GetBytesFromHexString(string strInput)
{
byte[] bytArOutput = new byte[] { };
if ((!string.IsNullOrEmpty(strInput)) && strInput.Length % 2 == 0)
{
SoapHexBinary hexBinary = null;
try
{
hexBinary = SoapHexBinary.Parse(strInput);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
bytArOutput = hexBinary.Value;
}
return bytArOutput;
}


private byte[] GenerateIV()
{
byte[] bytArOutput = new byte[] { };
try
{
string strIV = CalcMD5(IV);
bytArOutput = GetBytesFromHexString(strIV);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
return bytArOutput;
}


private byte[] GenerateKey()
{
byte[] bytArOutput = new byte[] { };
try
{
string strKey = CalcMD5(KEY);
bytArOutput = GetBytesFromHexString(strKey);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
return bytArOutput;
}


protected internal string Encrypt(string strInput, CipherMode cipherMode)
{
string strOutput = string.Empty;
if (!string.IsNullOrEmpty(strInput))
{
try
{
byte[] bytePlainText = Encoding.Default.GetBytes(strInput);
using (RijndaelManaged rijManaged = new RijndaelManaged())
{
rijManaged.Mode = cipherMode;
rijManaged.BlockSize = 128;
rijManaged.KeySize = 128;
rijManaged.IV = GenerateIV();
rijManaged.Key = GenerateKey();
rijManaged.Padding = PaddingMode.Zeros;
ICryptoTransform icpoTransform = rijManaged.CreateEncryptor(rijManaged.Key, rijManaged.IV);
using (MemoryStream memStream = new MemoryStream())
{
using (CryptoStream cpoStream = new CryptoStream(memStream, icpoTransform, CryptoStreamMode.Write))
{
cpoStream.Write(bytePlainText, 0, bytePlainText.Length);
cpoStream.FlushFinalBlock();
}
strOutput = Encoding.Default.GetString(memStream.ToArray());
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
return strOutput;
}


protected internal string Decrypt(string strInput, CipherMode cipherMode)
{
string strOutput = string.Empty;
if (!string.IsNullOrEmpty(strInput))
{
try
{
byte[] byteCipherText = Encoding.Default.GetBytes(strInput);
byte[] byteBuffer = new byte[strInput.Length];
using (RijndaelManaged rijManaged = new RijndaelManaged())
{
rijManaged.Mode = cipherMode;
rijManaged.BlockSize = 128;
rijManaged.KeySize = 128;
rijManaged.IV = GenerateIV();
rijManaged.Key = GenerateKey();
rijManaged.Padding = PaddingMode.Zeros;
ICryptoTransform icpoTransform = rijManaged.CreateDecryptor(rijManaged.Key, rijManaged.IV);
using (MemoryStream memStream = new MemoryStream(byteCipherText))
{
using (CryptoStream cpoStream = new CryptoStream(memStream, icpoTransform, CryptoStreamMode.Read))
{
cpoStream.Read(byteBuffer, 0, byteBuffer.Length);
}
strOutput = Encoding.Default.GetString(byteBuffer);
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
return strOutput;
}


}
}
小开

我最近在自己的项目中不得不再次遇到这个问题——并且想要分享一些我一直在使用的更简单的代码，因为这个问题和一系列的答案不断出现在我的搜索中。

我不打算讨论关于如何更新像 盐和 初始向量这样的东西的频率的安全问题-这是一个安全论坛的主题，有一些很棒的资源可以看看。这只是在 C # 中实现 AesManaged的代码块。

using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;


namespace Your.Namespace.Security {
public static class Cryptography {
#region Settings


private static int _iterations = 2;
private static int _keySize = 256;


private static string _hash     = "SHA1";
private static string _salt     = "aselrias38490a32"; // Random
private static string _vector   = "8947az34awl34kjq"; // Random


#endregion


public static string Encrypt(string value, string password) {
return Encrypt<AesManaged>(value, password);
}
public static string Encrypt<T>(string value, string password)
where T : SymmetricAlgorithm, new() {
byte[] vectorBytes = GetBytes<ASCIIEncoding>(_vector);
byte[] saltBytes = GetBytes<ASCIIEncoding>(_salt);
byte[] valueBytes = GetBytes<UTF8Encoding>(value);


byte[] encrypted;
using (T cipher = new T()) {
PasswordDeriveBytes _passwordBytes =
new PasswordDeriveBytes(password, saltBytes, _hash, _iterations);
byte[] keyBytes = _passwordBytes.GetBytes(_keySize / 8);


cipher.Mode = CipherMode.CBC;


using (ICryptoTransform encryptor = cipher.CreateEncryptor(keyBytes, vectorBytes)) {
using (MemoryStream to = new MemoryStream()) {
using (CryptoStream 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 value, string password) {
return Decrypt<AesManaged>(value, password);
}
public static string Decrypt<T>(string value, string password) where T : SymmetricAlgorithm, new() {
byte[] vectorBytes = GetBytes<ASCIIEncoding>(_vector);
byte[] saltBytes = GetBytes<ASCIIEncoding>(_salt);
byte[] valueBytes = Convert.FromBase64String(value);


byte[] decrypted;
int decryptedByteCount = 0;


using (T cipher = new T()) {
PasswordDeriveBytes _passwordBytes = new PasswordDeriveBytes(password, saltBytes, _hash, _iterations);
byte[] keyBytes = _passwordBytes.GetBytes(_keySize / 8);


cipher.Mode = CipherMode.CBC;


try {
using (ICryptoTransform decryptor = cipher.CreateDecryptor(keyBytes, vectorBytes)) {
using (MemoryStream from = new MemoryStream(valueBytes)) {
using (CryptoStream reader = new CryptoStream(from, decryptor, CryptoStreamMode.Read)) {
decrypted = new byte[valueBytes.Length];
decryptedByteCount = reader.Read(decrypted, 0, decrypted.Length);
}
}
}
} catch (Exception ex) {
return String.Empty;
}


cipher.Clear();
}
return Encoding.UTF8.GetString(decrypted, 0, decryptedByteCount);
}


}
}

该代码使用起来非常简单，只需要以下内容:

string encrypted = Cryptography.Encrypt(data, "testpass");
string decrypted = Cryptography.Decrypt(encrypted, "testpass");

By default, the implementation uses AesManaged - but you could actually also insert any other SymmetricAlgorithm. A list of the available SymmetricAlgorithm inheritors for .NET 4.5 can be found at:

Http://msdn.microsoft.com/en-us/library/system.security.cryptography.symmetricalgorithm.aspx

截至本文发表之时，目前的名单包括:

  • AesManaged
  • RijndaelManaged
  • DESCryptoServiceProvider
  • RC2CryptoServiceProvider
  • TripleDESCryptoServiceProvider

为了将 RijndaelManaged与上面的代码一起使用，例如，您可以使用:

string encrypted = Cryptography.Encrypt<RijndaelManaged>(dataToEncrypt, password);
string decrypted = Cryptography.Decrypt<RijndaelManaged>(encrypted, password);

我希望这对外面的人有帮助。

小开

You can use password from text box like key... 有了这个代码，你可以加密/解密文本，图片，文字文档，pdf..。

 public class Rijndael
{
private byte[] key;
private readonly byte[] vector = { 255, 64, 191, 111, 23, 3, 113, 119, 231, 121, 252, 112, 79, 32, 114, 156 };


ICryptoTransform EnkValue, DekValue;


public Rijndael(byte[] key)
{
this.key = key;
RijndaelManaged rm = new RijndaelManaged();
rm.Padding = PaddingMode.PKCS7;
EnkValue = rm.CreateEncryptor(key, vector);
DekValue = rm.CreateDecryptor(key, vector);
}


public byte[] Encrypt(byte[] byte)
{


byte[] enkByte= byte;
byte[] enkNewByte;
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, EnkValue, CryptoStreamMode.Write))
{
cs.Write(enkByte, 0, enkByte.Length);
cs.FlushFinalBlock();


ms.Position = 0;
enkNewByte= new byte[ms.Length];
ms.Read(enkNewByte, 0, enkNewByte.Length);
}
}
return enkNeyByte;
}


public byte[] Dekrypt(byte[] enkByte)
{
byte[] dekByte;
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, DekValue, CryptoStreamMode.Write))
{
cs.Write(enkByte, 0, enkByte.Length);
cs.FlushFinalBlock();


ms.Position = 0;
dekByte= new byte[ms.Length];
ms.Read(dekByte, 0, dekByte.Length);
}
}
return dekByte;
}
}

将密码从文本框转换为字节数组..。

private byte[] ConvertPasswordToByte(string password)
{
byte[] key = new byte[32];
for (int i = 0; i < passwprd.Length; i++)
{
key[i] = Convert.ToByte(passwprd[i]);
}
return key;
}
小开 
//Code to encrypt Data :
public byte[] encryptdata(byte[] bytearraytoencrypt, string key, string iv)
{
AesCryptoServiceProvider dataencrypt = new AesCryptoServiceProvider();
//Block size : Gets or sets the block size, in bits, of the cryptographic operation.
dataencrypt.BlockSize = 128;
//KeySize: Gets or sets the size, in bits, of the secret key
dataencrypt.KeySize = 128;
//Key: Gets or sets the symmetric key that is used for encryption and decryption.
dataencrypt.Key = System.Text.Encoding.UTF8.GetBytes(key);
//IV : Gets or sets the initialization vector (IV) for the symmetric algorithm
dataencrypt.IV = System.Text.Encoding.UTF8.GetBytes(iv);
//Padding: Gets or sets the padding mode used in the symmetric algorithm
dataencrypt.Padding = PaddingMode.PKCS7;
//Mode: Gets or sets the mode for operation of the symmetric algorithm
dataencrypt.Mode = CipherMode.CBC;
//Creates a symmetric AES encryptor object using the current key and initialization vector (IV).
ICryptoTransform crypto1 = dataencrypt.CreateEncryptor(dataencrypt.Key, dataencrypt.IV);
//TransformFinalBlock is a special function for transforming the last block or a partial block in the stream.
//It returns a new array that contains the remaining transformed bytes. A new array is returned, because the amount of
//information returned at the end might be larger than a single block when padding is added.
byte[] encrypteddata = crypto1.TransformFinalBlock(bytearraytoencrypt, 0, bytearraytoencrypt.Length);
crypto1.Dispose();
//return the encrypted data
return encrypteddata;
}


//code to decrypt data
private byte[] decryptdata(byte[] bytearraytodecrypt, string key, string iv)
{


AesCryptoServiceProvider keydecrypt = new AesCryptoServiceProvider();
keydecrypt.BlockSize = 128;
keydecrypt.KeySize = 128;
keydecrypt.Key = System.Text.Encoding.UTF8.GetBytes(key);
keydecrypt.IV = System.Text.Encoding.UTF8.GetBytes(iv);
keydecrypt.Padding = PaddingMode.PKCS7;
keydecrypt.Mode = CipherMode.CBC;
ICryptoTransform crypto1 = keydecrypt.CreateDecryptor(keydecrypt.Key, keydecrypt.IV);


byte[] returnbytearray = crypto1.TransformFinalBlock(bytearraytodecrypt, 0, bytearraytodecrypt.Length);
crypto1.Dispose();
return returnbytearray;
}
小开

这里有一个简洁明了的代码来理解在 C # 中实现的 AES 256算法 作为 encryptedstring = cryptObj.Encrypt(username, "AGARAMUDHALA", "EZHUTHELLAM", "SHA1", 3, "@1B2c3D4e5F6g7H8", 256);调用加密函数

public class Crypt
{
public string Encrypt(string passtext, string passPhrase, string saltV, string hashstring, int Iterations, string initVect, int keysize)
{
string functionReturnValue = null;
// Convert strings into byte arrays.
// Let us assume that strings only contain ASCII codes.
// If strings include Unicode characters, use Unicode, UTF7, or UTF8
// encoding.
byte[] initVectorBytes = null;
initVectorBytes = Encoding.ASCII.GetBytes(initVect);
byte[] saltValueBytes = null;
saltValueBytes = Encoding.ASCII.GetBytes(saltV);


// Convert our plaintext into a byte array.
// Let us assume that plaintext contains UTF8-encoded characters.
byte[] plainTextBytes = null;
plainTextBytes = Encoding.UTF8.GetBytes(passtext);
// First, we must create a password, from which the key will be derived.
// This password will be generated from the specified passphrase and
// salt value. The password will be created using the specified hash
// algorithm. Password creation can be done in several iterations.
PasswordDeriveBytes password = default(PasswordDeriveBytes);
password = new PasswordDeriveBytes(passPhrase, saltValueBytes, hashstring, Iterations);
// Use the password to generate pseudo-random bytes for the encryption
// key. Specify the size of the key in bytes (instead of bits).
byte[] keyBytes = null;
keyBytes = password.GetBytes(keysize/8);
// Create uninitialized Rijndael encryption object.
RijndaelManaged symmetricKey = default(RijndaelManaged);
symmetricKey = new RijndaelManaged();


// It is reasonable to set encryption mode to Cipher Block Chaining
// (CBC). Use default options for other symmetric key parameters.
symmetricKey.Mode = CipherMode.CBC;
// Generate encryptor from the existing key bytes and initialization
// vector. Key size will be defined based on the number of the key
// bytes.
ICryptoTransform encryptor = default(ICryptoTransform);
encryptor = symmetricKey.CreateEncryptor(keyBytes, initVectorBytes);


// Define memory stream which will be used to hold encrypted data.
MemoryStream memoryStream = default(MemoryStream);
memoryStream = new MemoryStream();


// Define cryptographic stream (always use Write mode for encryption).
CryptoStream cryptoStream = default(CryptoStream);
cryptoStream = new CryptoStream(memoryStream, encryptor, CryptoStreamMode.Write);
// Start encrypting.
cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);


// Finish encrypting.
cryptoStream.FlushFinalBlock();
// Convert our encrypted data from a memory stream into a byte array.
byte[] cipherTextBytes = null;
cipherTextBytes = memoryStream.ToArray();


// Close both streams.
memoryStream.Close();
cryptoStream.Close();


// Convert encrypted data into a base64-encoded string.
string cipherText = null;
cipherText = Convert.ToBase64String(cipherTextBytes);


functionReturnValue = cipherText;
return functionReturnValue;
}
public string Decrypt(string cipherText, string passPhrase, string saltValue, string hashAlgorithm, int passwordIterations, string initVector, int keySize)
{
string functionReturnValue = null;


// Convert strings defining encryption key characteristics into byte
// arrays. Let us assume that strings only contain ASCII codes.
// If strings include Unicode characters, use Unicode, UTF7, or UTF8
// encoding.




byte[] initVectorBytes = null;
initVectorBytes = Encoding.ASCII.GetBytes(initVector);


byte[] saltValueBytes = null;
saltValueBytes = Encoding.ASCII.GetBytes(saltValue);


// Convert our ciphertext into a byte array.
byte[] cipherTextBytes = null;
cipherTextBytes = Convert.FromBase64String(cipherText);


// First, we must create a password, from which the key will be
// derived. This password will be generated from the specified
// passphrase and salt value. The password will be created using
// the specified hash algorithm. Password creation can be done in
// several iterations.
PasswordDeriveBytes password = default(PasswordDeriveBytes);
password = new PasswordDeriveBytes(passPhrase, saltValueBytes, hashAlgorithm, passwordIterations);


// Use the password to generate pseudo-random bytes for the encryption
// key. Specify the size of the key in bytes (instead of bits).
byte[] keyBytes = null;
keyBytes = password.GetBytes(keySize / 8);


// Create uninitialized Rijndael encryption object.
RijndaelManaged symmetricKey = default(RijndaelManaged);
symmetricKey = new RijndaelManaged();


// It is reasonable to set encryption mode to Cipher Block Chaining
// (CBC). Use default options for other symmetric key parameters.
symmetricKey.Mode = CipherMode.CBC;


// Generate decryptor from the existing key bytes and initialization
// vector. Key size will be defined based on the number of the key
// bytes.
ICryptoTransform decryptor = default(ICryptoTransform);
decryptor = symmetricKey.CreateDecryptor(keyBytes, initVectorBytes);


// Define memory stream which will be used to hold encrypted data.
MemoryStream memoryStream = default(MemoryStream);
memoryStream = new MemoryStream(cipherTextBytes);


// Define memory stream which will be used to hold encrypted data.
CryptoStream cryptoStream = default(CryptoStream);
cryptoStream = new CryptoStream(memoryStream, decryptor, CryptoStreamMode.Read);


// Since at this point we don't know what the size of decrypted data
// will be, allocate the buffer long enough to hold ciphertext;
// plaintext is never longer than ciphertext.
byte[] plainTextBytes = null;
plainTextBytes = new byte[cipherTextBytes.Length + 1];


// Start decrypting.
int decryptedByteCount = 0;
decryptedByteCount = cryptoStream.Read(plainTextBytes, 0, plainTextBytes.Length);


// Close both streams.
memoryStream.Close();
cryptoStream.Close();


// Convert decrypted data into a string.
// Let us assume that the original plaintext string was UTF8-encoded.
string plainText = null;
plainText = Encoding.UTF8.GetString(plainTextBytes, 0, decryptedByteCount);


// Return decrypted string.
functionReturnValue = plainText;




return functionReturnValue;
}
}
小开

Http://www.codeproject.com/articles/769741/csharp-aes-bits-encryption-library-with-salt

using System.Security.Cryptography;
using System.IO;

 

public byte[] AES_Encrypt(byte[] bytesToBeEncrypted, byte[] passwordBytes)
{
byte[] encryptedBytes = null;
byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
using (MemoryStream ms = new MemoryStream())
{
using (RijndaelManaged AES = new RijndaelManaged())
{
AES.KeySize = 256;
AES.BlockSize = 128;
var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
AES.Key = key.GetBytes(AES.KeySize / 8);
AES.IV = key.GetBytes(AES.BlockSize / 8);
AES.Mode = CipherMode.CBC;
using (var cs = new CryptoStream(ms, AES.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(bytesToBeEncrypted, 0, bytesToBeEncrypted.Length);
cs.Close();
}
encryptedBytes = ms.ToArray();
}
}
return encryptedBytes;
}


public byte[] AES_Decrypt(byte[] bytesToBeDecrypted, byte[] passwordBytes)
{
byte[] decryptedBytes = null;
byte[] saltBytes = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 };
using (MemoryStream ms = new MemoryStream())
{
using (RijndaelManaged AES = new RijndaelManaged())
{
AES.KeySize = 256;
AES.BlockSize = 128;
var key = new Rfc2898DeriveBytes(passwordBytes, saltBytes, 1000);
AES.Key = key.GetBytes(AES.KeySize / 8);
AES.IV = key.GetBytes(AES.BlockSize / 8);
AES.Mode = CipherMode.CBC;
using (var cs = new CryptoStream(ms, AES.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(bytesToBeDecrypted, 0, bytesToBeDecrypted.Length);
cs.Close();
}
decryptedBytes = ms.ToArray();
}
}
return decryptedBytes;
}

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