/// <summary>
/// Transforms an input block.
/// </summary>
/// <param name="transformField">Either the <see cref="encryptor"/> or <see cref="decryptor"/> field.</param>
/// <param name="transformCreator">The function to create a new transformer.</param>
/// <param name="data">The input data.</param>
/// <param name="iv">The initialization vector.</param>
/// <returns>The result of the transform.</returns>
private byte[] CipherOperation(ref Platform.ICryptoTransform transformField, Func <SymmetricCryptographicKey, byte[], Platform.ICryptoTransform> transformCreator, byte[] data, byte[] iv)
{
Requires.NotNull(transformCreator, nameof(transformCreator));
Requires.NotNull(data, nameof(data));
if (this.Padding == SymmetricAlgorithmPadding.None && data.Length == 0)
{
return(data);
}
if (iv != null || !this.CanStreamAcrossTopLevelCipherOperations || transformField == null)
{
transformField?.Dispose();
transformField = transformCreator(this, iv);
}
if (this.CanStreamAcrossTopLevelCipherOperations)
{
byte[] outputBlock = new byte[data.Length];
int bytesOutput = transformField.TransformBlock(data, 0, data.Length, outputBlock, 0);
Array.Resize(ref outputBlock, bytesOutput);
return(outputBlock);
}
else
{
return(transformField.TransformFinalBlock(data, 0, data.Length));
}
}
public string mEncryptUTF(string text)
{
byte[] plainBytes = System.Text.UTF8Encoding.UTF8.GetBytes(text);
byte[] cipherBytes;
using (System.Security.Cryptography.ICryptoTransform sse = rc2.CreateEncryptor())
{
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, sse, CryptoStreamMode.Write))
{
cs.Write(plainBytes, 0, plainBytes.Length);
cs.FlushFinalBlock();
cs.Close();
cs.Dispose();
}
cipherBytes = ms.ToArray();
ms.Close();
ms.Dispose();
}
sse.Dispose();
}
return(Convert.ToBase64String(cipherBytes, 0, cipherBytes.Length));
}
/// <summary>
/// Método para encriptar em AES
/// </summary>
/// <param name="plaintext"></param>
/// <param name="text"></param>
/// <returns></returns>
public static byte[] Encrypt(byte[] plaintext, string text)
{
/*
* Block Length: 128bit
* Block Mode: ECB
* Data Padding: Padded by bytes which Asc() equal for number of padded bytes (done automagically)
* Key Padding: 0x00 padded to multiple of 16 bytes
* IV: None
*/
byte[] key = System.Text.ASCIIEncoding.ASCII.GetBytes(text);
System.Security.Cryptography.RijndaelManaged AES = new System.Security.Cryptography.RijndaelManaged();
AES.BlockSize = 128;
AES.Mode = System.Security.Cryptography.CipherMode.ECB;
AES.Key = key;
System.Security.Cryptography.ICryptoTransform encryptor = AES.CreateEncryptor();
MemoryStream mem = new MemoryStream();
System.Security.Cryptography.CryptoStream cryptStream = new System.Security.Cryptography.CryptoStream(mem, encryptor,
System.Security.Cryptography.CryptoStreamMode.Write);
cryptStream.Write(plaintext, 0, plaintext.Length);
cryptStream.FlushFinalBlock();
byte[] cypher = mem.ToArray();
cryptStream.Close();
cryptStream = null;
encryptor.Dispose();
AES = null;
return(cypher);
}
