/// <summary>
/// Decrypts the array block.
/// </summary>
/// <param name="data">The data.</param>
/// <returns></returns>
public byte[] DecryptArrayBlock(byte[] data)
{
var bBloblSize = new byte[Marshal.SizeOf(typeof(int))];
byte[] bEncryptedNonce;
byte[] bEncryptedData;
using (var ms = new MemoryStream(data))
{
ms.Read(bBloblSize, 0, bBloblSize.Length);
bEncryptedNonce = new byte[BitConverter.ToInt32(bBloblSize, 0)];
ms.Read(bEncryptedNonce, 0, bEncryptedNonce.Length);
ms.Read(bBloblSize, 0, bBloblSize.Length);
bEncryptedData = new byte[BitConverter.ToInt32(bBloblSize, 0)];
ms.Read(bEncryptedData, 0, bEncryptedData.Length);
}
NonceContainer nonceContainer;
using (var ff = new FastBinaryFormatter())
{
nonceContainer = ff.Deserialize <NonceContainer>(DecryptBytes(bEncryptedNonce));
}
return(CryptoServices.AesDecrypt(bEncryptedData, nonceContainer.Nonce));
}
/// <summary>
/// Encrypts the array block.
/// </summary>
/// <param name="data">The data.</param>
/// <returns></returns>
public byte[] EncryptArrayBlock(byte[] data)
{
var nonceContainer = new NonceContainer(CryptoServices.CreateNonce(128));
byte[] bEncryptedNonce;
using (var ff = new FastBinaryFormatter())
{
bEncryptedNonce = EncryptBytes(ff.Serialize(nonceContainer));
}
var bEncryptedData = CryptoServices.AesEncrypt(data, nonceContainer.Nonce);
using (var ms = new MemoryStream())
{
var bBlobSize = BitConverter.GetBytes(bEncryptedNonce.Length);
ms.Write(bBlobSize, 0, bBlobSize.Length);
ms.Write(bEncryptedNonce, 0, bEncryptedNonce.Length);
bBlobSize = BitConverter.GetBytes(bEncryptedData.Length);
ms.Write(bBlobSize, 0, bBlobSize.Length);
ms.Write(bEncryptedData, 0, bEncryptedData.Length);
return(ms.ToArray());
}
}
/// <summary>
/// Decrypts the specified key.
/// </summary>
/// <param name="key">The key.</param>
/// <param name="IV">The iv.</param>
/// <param name="data">The data.</param>
/// <param name="cm">The cm.</param>
/// <param name="symName">Name of the sym.</param>
/// <returns></returns>
public static byte[] Decrypt(byte[] key, byte[] IV, byte[] data, CipherMode cm, string symName)
{
using (var sa = CryptoServices.CreateSymmetricAlgorithm(symName))
{
return(Decrypt(key, IV, data, cm, sa));
}
}
/// <summary>
/// Initializes a new instance of the <see cref="Symmetric"/> class.
/// </summary>
/// <param name="passPhrase">The pass phrase.</param>
/// <param name="iv">The iv.</param>
/// <exception cref="System.ArgumentException">
/// Bad pass phrase
/// or
/// Bad initialization vector
/// </exception>
public Symmetric(string passPhrase, string iv)
{
Disposed = false;
if (null == passPhrase || 8 > passPhrase.Length)
{
throw new ArgumentException("Bad pass phrase");
}
if (null == iv || 8 > iv.Length)
{
throw new ArgumentException("Bad initialization vector");
}
_csp = new RijndaelManaged();
_csp.Mode = CipherMode.CBC;
_csp.Padding = PaddingMode.PKCS7;
_blockSize = (_csp.BlockSize / 8) * BLOCK_MULTIPLIER;
Encoding encoder = new UTF8Encoding(false, true);
_ivBytes = CryptoServices.ComputeHash(encoder.GetBytes(iv), "SHA256");
Array.Resize(ref _ivBytes, 16);
var pdb = new PasswordDeriveBytes(passPhrase, _ivBytes, "SHA256", 100);
_keyBytes = pdb.GetBytes(KEY_SIZE);
}
/// <summary>
/// Encrypts the specified key.
/// </summary>
/// <param name="key">The key.</param>
/// <param name="data">The data.</param>
/// <param name="cm">The cm.</param>
/// <param name="symName">Name of the sym.</param>
/// <param name="hashName">Name of the hash.</param>
/// <returns></returns>
public static byte[] Encrypt(byte[] key, byte[] data, CipherMode cm, string symName, string hashName)
{
var bSize = BitConverter.GetBytes(data.Length);
var dataToEncrypt = new byte[data.Length + bSize.Length];
Array.Copy(bSize, 0, dataToEncrypt, 0, bSize.Length);
Array.Copy(data, 0, dataToEncrypt, bSize.Length, data.Length);
using (var sa = CryptoServices.CreateSymmetricAlgorithm(symName))
{
try
{
using (var ha = CryptoServices.CreateHashAlgorithm(hashName))
{
try
{
var IV = sa.IV;
var rKey = CryptoServices.InsureVector(ha.ComputeHash(key), sa.Key.Length, ha);
var rIV = CryptoServices.InsureVector(ha.ComputeHash(IV), sa.IV.Length, ha);
var eData = Encrypt(rKey, rIV, dataToEncrypt, cm, sa);
var rData = new byte[IV.Length + eData.Length];
Array.Copy(IV, 0, rData, 0, IV.Length);
Array.Copy(eData, 0, rData, IV.Length, eData.Length);
return(rData);
}
finally
{
ha.Clear();
}
}
}
finally
{
sa.Clear();
}
}
}
/// <summary>
/// Decrypts the specified key.
/// </summary>
/// <param name="key">The key.</param>
/// <param name="data">The data.</param>
/// <param name="cm">The cm.</param>
/// <param name="symName">Name of the sym.</param>
/// <param name="hashName">Name of the hash.</param>
/// <returns></returns>
public static byte[] Decrypt(byte[] key, byte[] data, CipherMode cm, string symName, string hashName)
{
using (var sa = CryptoServices.CreateSymmetricAlgorithm(symName))
{
try
{
using (var ha = CryptoServices.CreateHashAlgorithm(hashName))
{
try
{
var IV = new byte[sa.IV.Length];
var eData = new byte[data.Length - IV.Length];
Array.Copy(data, 0, IV, 0, IV.Length);
Array.Copy(data, IV.Length, eData, 0, eData.Length);
var rKey = CryptoServices.InsureVector(ha.ComputeHash(key), sa.Key.Length, ha);
var rIV = CryptoServices.InsureVector(ha.ComputeHash(IV), sa.IV.Length, ha);
var tmpDecryptData = Decrypt(rKey, rIV, eData, cm, sa);
var rData = new byte[BitConverter.ToInt32(tmpDecryptData, 0)];
Array.Copy(tmpDecryptData, Marshal.SizeOf(rData.Length), rData, 0, rData.Length);
return(rData);
}
finally
{
ha.Clear();
}
}
}
finally
{
sa.Clear();
}
}
}
