Crypt. C#
Появилась задача сделать ActiveX компонент для encrypt/decrypt со статическими ключами/солью. Разбор полётов с примерами породил такой сырец:
(внимание гостям, это рабочий варинт. не прилизан, не урезан не обфусцирован, много копи-паст :))
Как есть. Вектор и соль менять.
using System;
using System.Runtime.InteropServices;
using System.IO;
using System.Text;
using System.Security.Cryptography;
namespace AlexCrypt
{
[ComVisible(true)]
[Guid("235D87E1-9BFA-47AB-9E97-CF1A2D342054")]
public interface IAlexCrypt
{
string Encrypt(
string cipherText,
string passPhrase);
string Decrypt(
string cipherText,
string passPhrase);
}
[Guid("162E64E6-99D6-47BB-B52E-1A4205EFF5AF")]
[ClassInterface(ClassInterfaceType.None)]
//[ProgId("AlexCrypt")]
[ComVisible(true)]
public class AlexCrypt : IAlexCrypt
{
public string Encrypt
(
string plainText,
string passPhrase)
{
string saltValue = "*4b5FHMwa$h22=Wh";
string hashAlgorithm = "SHA1";
int passwordIterations = 2;
string initVector = "sQY*K&TF8MMcR3=r";
int keySize = 256;
string cipherText = "";
try
{
byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector);
byte[] saltValueBytes = Encoding.ASCII.GetBytes(saltValue);
byte[] plainTextBytes = Encoding.UTF8.GetBytes(plainText);
PasswordDeriveBytes password = new PasswordDeriveBytes
(
passPhrase,
saltValueBytes,
hashAlgorithm,
passwordIterations
);
byte[] keyBytes = password.GetBytes(keySize / 8);
RijndaelManaged symmetricKey = new RijndaelManaged();
symmetricKey.Mode = CipherMode.CBC;
ICryptoTransform encryptor = symmetricKey.CreateEncryptor
(
keyBytes,
initVectorBytes
);
MemoryStream memoryStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream
(
memoryStream,
encryptor,
CryptoStreamMode.Write
);
cryptoStream.Write(plainTextBytes, 0, plainTextBytes.Length);
cryptoStream.FlushFinalBlock();
byte[] cipherTextBytes = memoryStream.ToArray();
memoryStream.Close();
cryptoStream.Close();
cipherText = Convert.ToBase64String(cipherTextBytes);
}
catch
{
cipherText = "Error";
}
return cipherText;
}
public string Decrypt
(
string cipherText,
string passPhrase
)
{
string saltValue = "*4b5FHMwa$h22=Wh";
string hashAlgorithm = "SHA1";
int passwordIterations = 2;
string initVector = "sQY*K&TF8MMcR3=r";
int keySize = 256;
string plainText = "";
try
{
byte[] initVectorBytes = Encoding.ASCII.GetBytes(initVector);
byte[] saltValueBytes = Encoding.ASCII.GetBytes(saltValue);
byte[] cipherTextBytes = Convert.FromBase64String(cipherText);
PasswordDeriveBytes password = new PasswordDeriveBytes
(
passPhrase,
saltValueBytes,
hashAlgorithm,
passwordIterations
);
byte[] keyBytes = password.GetBytes(keySize / 8);
RijndaelManaged symmetricKey = new RijndaelManaged();
symmetricKey.Mode = CipherMode.CBC;
ICryptoTransform decryptor = symmetricKey.CreateDecryptor
(
keyBytes,
initVectorBytes
);
MemoryStream memoryStream = new MemoryStream(cipherTextBytes);
CryptoStream cryptoStream = new CryptoStream
(
memoryStream,
decryptor,
CryptoStreamMode.Read
);
byte[] plainTextBytes = new byte[cipherTextBytes.Length];
int decryptedByteCount = cryptoStream.Read
(
plainTextBytes,
0,
plainTextBytes.Length
);
memoryStream.Close();
cryptoStream.Close();
plainText = Encoding.UTF8.GetString
(
plainTextBytes,
0,
decryptedByteCount
);
}
catch
{
plainText = "Error";
}
return plainText;
}
}
}
