// ========================================
// static field
// ========================================
public static string EncryptString(string str, string password)
{
var aes = new System.Security.Cryptography.AesCryptoServiceProvider();
var data = System.Text.Encoding.UTF8.GetBytes(str);
var passwordBytes = System.Text.Encoding.UTF8.GetBytes(password);
aes.Key = ResizeBytesArray(passwordBytes, aes.Key.Length);
aes.IV = ResizeBytesArray(passwordBytes, aes.IV.Length);
var stream = new System.IO.MemoryStream();
var encryptor = aes.CreateEncryptor();
var cryptStream = new System.Security.Cryptography.CryptoStream(
stream,
encryptor,
System.Security.Cryptography.CryptoStreamMode.Write
);
try {
cryptStream.Write(data, 0, data.Length);
cryptStream.FlushFinalBlock();
var encrypted = stream.ToArray();
return(System.Convert.ToBase64String(encrypted));
} finally {
cryptStream.Close();
stream.Close();
}
}
public byte[] Encrypt(string plainText, out byte[] keyBytes, out byte[] ivBytes)
{
if (plainText == null || plainText.Length <= 0)
{
throw new ArgumentNullException("plainText");
}
System.IO.MemoryStream memoryStream;
using (System.Security.Cryptography.AesCryptoServiceProvider csp = new System.Security.Cryptography.AesCryptoServiceProvider())
{
csp.GenerateKey();
csp.GenerateIV();
keyBytes = csp.Key;
ivBytes = csp.IV;
//csp.CreateEncryptor
// Create an encryptor to perform the stream transform.
System.Security.Cryptography.ICryptoTransform cryptoTransformer = csp.CreateEncryptor(csp.Key, csp.IV);
// Create the streams used for encryption.
using (memoryStream = new System.IO.MemoryStream())
using (System.Security.Cryptography.CryptoStream cryptoStream = new System.Security.Cryptography.CryptoStream(memoryStream, cryptoTransformer, System.Security.Cryptography.CryptoStreamMode.Write))
using (System.IO.StreamWriter sw = new System.IO.StreamWriter(cryptoStream))
{
sw.AutoFlush = true;
sw.Write(plainText);
}
}
return(memoryStream.ToArray());
}
public static byte[] AESEncrypt(byte[] input)
{
using (var aes = new System.Security.Cryptography.AesCryptoServiceProvider())
{
aes.Key = aeskey;
aes.IV = aesvector;
using (var ms = new System.IO.MemoryStream())
{
var cs = new System.Security.Cryptography.CryptoStream(ms, aes.CreateEncryptor(), System.Security.Cryptography.CryptoStreamMode.Write);
if (cs == null)
{
return(null);
}
cs.Write(input, 0, input.Length);
cs.FlushFinalBlock();
return(ms.ToArray());
}
}
}
private string Encrypt256(string text)
{
// AesCryptoServiceProvider
System.Security.Cryptography.AesCryptoServiceProvider aes = new System.Security.Cryptography.AesCryptoServiceProvider();
aes.BlockSize = 128;
aes.KeySize = 256;
aes.IV = System.Text.Encoding.UTF8.GetBytes(AesIV256);
aes.Key = System.Text.Encoding.UTF8.GetBytes(AesKey256);
aes.Mode = System.Security.Cryptography.CipherMode.CBC;
aes.Padding = System.Security.Cryptography.PaddingMode.PKCS7;
// Convert string to byte array
byte[] src = System.Text.Encoding.Unicode.GetBytes(text);
// encryption
using (System.Security.Cryptography.ICryptoTransform encrypt = aes.CreateEncryptor())
{
byte[] dest = encrypt.TransformFinalBlock(src, 0, src.Length);
// Convert byte array to Base64 strings
return Convert.ToBase64String(dest);
}
}
/// <summary>
/// Construct a keyed universal hash function.
///
/// An instance of a universal hash function needs to store on the order of RandomKeyVectorLengthInBytes values upon construction,
/// so it is best not to initialize this function for large strings (e.g., those over 32k).
///
/// </summary>
/// <param name="keyOf16Or24Or32Bytes">A key that should not be known to those who might try to create collisions, provided as an array of 16, 24, or 32 bytes.</param>
/// <param name="randomKeyVectorLengthInBytes">The length of the random key vector used for hashing. Should be twice the length of the longest value you expect to hash,
/// unless you hash values bigger than you would want to keep in memory. If hashing a value longer than this, the universal hash properties may not hold.</param>
public UniversalHashFunction(byte[] keyOf16Or24Or32Bytes, int randomKeyVectorLengthInBytes = 256)
{
int numberOfRandomBytesToGenerate = SetVectorLengthAndGetNumberOfRandomBytesNeeded(randomKeyVectorLengthInBytes);
// Generate enough random bytes to fill the RandomKeyVector and 4 extra for the InitialRandomKey
using (System.Security.Cryptography.AesCryptoServiceProvider aes = new System.Security.Cryptography.AesCryptoServiceProvider())
{
aes.Key = keyOf16Or24Or32Bytes;
aes.IV = new byte[16];
aes.Mode = System.Security.Cryptography.CipherMode.CBC;
// Encrypt a null message with the key using CBC and InitializationVector=0
byte[] pseudoRandomBytes;
using (System.IO.MemoryStream ciphertext = new System.IO.MemoryStream())
{
using (System.Security.Cryptography.CryptoStream cs = new System.Security.Cryptography.CryptoStream(ciphertext, aes.CreateEncryptor(), System.Security.Cryptography.CryptoStreamMode.Write))
{
if (numberOfRandomBytesToGenerate % 16 != 0)
{
// Round to next 128-bit boundary since we're using AES 128-bit blocks to generate randomness
numberOfRandomBytesToGenerate += 16 - (numberOfRandomBytesToGenerate % 16);
}
cs.Write(new byte[numberOfRandomBytesToGenerate], 0, numberOfRandomBytesToGenerate);
// Ensure all bytes are flushed.
}
pseudoRandomBytes = ciphertext.ToArray();
}
// Create the random key vector and fill it with random bytes
_randomKeyVector = new ulong[randomKeyVectorLengthInBytes / 8];
for (int i = 0; i < _randomKeyVector.Length; i++)
_randomKeyVector[i] = BitConverter.ToUInt64(pseudoRandomBytes, i * 8);
// Fill the initial random key with the last remaining 8 bytes
_initialRandomKey = BitConverter.ToUInt64(pseudoRandomBytes, randomKeyVectorLengthInBytes);
}
}
public static string aesEncryptBase64(string SourceStr, ulong Key)
{
string encrypt = "";
try
{
var aes = new System.Security.Cryptography.AesCryptoServiceProvider();
var md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();
var sha256 = new System.Security.Cryptography.SHA256CryptoServiceProvider();
byte[] key = sha256.ComputeHash(BitConverter.GetBytes(Key));
byte[] iv = md5.ComputeHash(BitConverter.GetBytes(Key));
aes.Key = key;
aes.IV = iv;
byte[] dataByteArray = Encoding.UTF8.GetBytes(SourceStr);
using (var ms = new System.IO.MemoryStream())
using (var cs = new System.Security.Cryptography.CryptoStream(ms, aes.CreateEncryptor(), System.Security.Cryptography.CryptoStreamMode.Write))
{
cs.Write(dataByteArray, 0, dataByteArray.Length);
cs.FlushFinalBlock();
encrypt = Convert.ToBase64String(ms.ToArray());
}
}
catch (Exception e)
{
}
return(encrypt);
}
public static string Encrypt_Aes(this object value, string aesKey, string aesIV)
{
string plainText = value as string;
byte[] Key = GetBytes(aesKey);
byte[] IV = GetBytes(aesIV);
// 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 AesCryptoServiceProvider object
// with the specified key and IV.
using (System.Security.Cryptography.AesCryptoServiceProvider aesAlg = new System.Security.Cryptography.AesCryptoServiceProvider())
{
aesAlg.Key = Key;
aesAlg.IV = IV;
// Create a decrytor to perform the stream transform.
System.Security.Cryptography.ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
// Create the streams used for encryption.
using (MemoryStream msEncrypt = new MemoryStream())
{
using (System.Security.Cryptography.CryptoStream csEncrypt = new System.Security.Cryptography.CryptoStream(msEncrypt, encryptor, System.Security.Cryptography.CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
//Write all data to the stream.
swEncrypt.Write(plainText);
}
encrypted = msEncrypt.ToArray();
}
}
}
return encrypted.GetString();
}
/// <summary>
/// Construct a keyed universal hash function.
///
/// An instance of a universal hash function needs to store on the order of RandomKeyVectorLengthInBytes values upon construction,
/// so it is best not to initialize this function for large strings (e.g., those over 32k).
///
/// </summary>
/// <param name="keyOf16Or24Or32Bytes">A key that should not be known to those who might try to create collisions, provided as an array of 16, 24, or 32 bytes.</param>
/// <param name="randomKeyVectorLengthInBytes">The length of the random key vector used for hashing. Should be twice the length of the longest value you expect to hash,
/// unless you hash values bigger than you would want to keep in memory. If hashing a value longer than this, the universal hash properties may not hold.</param>
public UniversalHashFunction(byte[] keyOf16Or24Or32Bytes, int randomKeyVectorLengthInBytes = 256)
{
int numberOfRandomBytesToGenerate = SetVectorLengthAndGetNumberOfRandomBytesNeeded(randomKeyVectorLengthInBytes);
// Generate enough random bytes to fill the RandomKeyVector and 4 extra for the InitialRandomKey
using (System.Security.Cryptography.AesCryptoServiceProvider aes = new System.Security.Cryptography.AesCryptoServiceProvider())
{
aes.Key = keyOf16Or24Or32Bytes;
aes.IV = new byte[16];
aes.Mode = System.Security.Cryptography.CipherMode.CBC;
// Encrypt a null message with the key using CBC and InitializationVector=0
byte[] pseudoRandomBytes;
using (System.IO.MemoryStream ciphertext = new System.IO.MemoryStream())
{
using (System.Security.Cryptography.CryptoStream cs = new System.Security.Cryptography.CryptoStream(ciphertext, aes.CreateEncryptor(), System.Security.Cryptography.CryptoStreamMode.Write))
{
if (numberOfRandomBytesToGenerate % 16 != 0)
{
// Round to next 128-bit boundary since we're using AES 128-bit blocks to generate randomness
numberOfRandomBytesToGenerate += 16 - (numberOfRandomBytesToGenerate % 16);
}
cs.Write(new byte[numberOfRandomBytesToGenerate], 0, numberOfRandomBytesToGenerate);
// Ensure all bytes are flushed.
}
pseudoRandomBytes = ciphertext.ToArray();
}
// Create the random key vector and fill it with random bytes
_randomKeyVector = new ulong[randomKeyVectorLengthInBytes / 8];
for (int i = 0; i < _randomKeyVector.Length; i++)
{
_randomKeyVector[i] = BitConverter.ToUInt64(pseudoRandomBytes, i * 8);
}
// Fill the initial random key with the last remaining 8 bytes
_initialRandomKey = BitConverter.ToUInt64(pseudoRandomBytes, randomKeyVectorLengthInBytes);
}
}
