public bool fileOperation(string inFileName, string outFileName, cryptoAction action,
ref string _returnErrorCode)
{
if (!File.Exists(inFileName))
{
return(false);
}
try
{
if (((_key != null) &&
(_IV != null)))
{
var fsIn = new FileStream(inFileName, FileMode.Open, FileAccess.Read);
var fsOut = new FileStream(outFileName, FileMode.OpenOrCreate, FileAccess.Write);
fsOut.SetLength(0);
byte[] key = makeKeyByteArray();
byte[] IV = makeIVByteArray();
byte[] byteBuffer = null;
long fileLength = fsIn.Length;
long bytesProcesed = 0;
int bytesInBlock = 0;
ICryptoTransform transform = getServiceProvider(action, key, IV);
CryptoStream cryptoStream = null;
switch (action)
{
case cryptoAction.Encrypt:
cryptoStream = new CryptoStream(fsOut, transform, CryptoStreamMode.Write);
break;
case cryptoAction.Decrypt:
cryptoStream = new CryptoStream(fsOut, transform, CryptoStreamMode.Write);
break;
}
while ((bytesProcesed < fileLength))
{
bytesInBlock = fsIn.Read(byteBuffer, 0, 4096);
cryptoStream.Write(byteBuffer, 0, bytesInBlock);
bytesProcesed = (bytesProcesed + long.Parse(bytesInBlock.ToString()));
}
if (!(cryptoStream == null))
{
cryptoStream.Close();
}
fsIn.Close();
fsOut.Close();
_returnErrorCode = "";
return(true);
}
else
{
return(false);
}
}
catch (Exception ex)
{
ISException.RegisterExcepcion(ex);
return(false);
}
}
internal ICryptoTransform getServiceProvider(cryptoAction cAction, byte[] key, byte[] IV)
{
ICryptoTransform transform = null;
switch (algorithm)
{
case cryptoProvider.DES:
var des = new DESCryptoServiceProvider();
switch (cAction)
{
case cryptoAction.Encrypt:
// si estamos cifrando, creamos el objeto cifrador.
transform = des.CreateEncryptor(key, IV);
break;
case cryptoAction.Decrypt:
// si estamos descifrando, creamos el objeto descifrador.
transform = des.CreateDecryptor(key, IV);
break;
}
return transform;
case cryptoProvider.TripleDES:
var des3 = new TripleDESCryptoServiceProvider();
switch (cAction)
{
case cryptoAction.Encrypt:
transform = des3.CreateEncryptor(key, IV);
break;
case cryptoAction.Decrypt:
transform = des3.CreateDecryptor(key, IV);
break;
}
return transform;
case cryptoProvider.RC2:
var rc2 = new RC2CryptoServiceProvider();
switch (cAction)
{
case cryptoAction.Encrypt:
transform = rc2.CreateEncryptor(key, IV);
break;
case cryptoAction.Decrypt:
transform = rc2.CreateDecryptor(key, IV);
break;
}
return transform;
case cryptoProvider.Rijndael:
var rijndael = new RijndaelManaged();
switch (cAction)
{
case cryptoAction.Encrypt:
transform = rijndael.CreateEncryptor(key, IV);
break;
case cryptoAction.Decrypt:
transform = rijndael.CreateDecryptor(key, IV);
break;
}
return transform;
default:
throw new CryptographicException("Error al inicializar al proveedor de cifrado");
}
}
public bool fileOperation(string inFileName, string outFileName, cryptoAction action,
ref string _returnErrorCode)
{
if (!File.Exists(inFileName))
{
return false;
}
try
{
if (((_key != null)
&& (_IV != null)))
{
var fsIn = new FileStream(inFileName, FileMode.Open, FileAccess.Read);
var fsOut = new FileStream(outFileName, FileMode.OpenOrCreate, FileAccess.Write);
fsOut.SetLength(0);
byte[] key = makeKeyByteArray();
byte[] IV = makeIVByteArray();
byte[] byteBuffer = null;
long fileLength = fsIn.Length;
long bytesProcesed = 0;
int bytesInBlock = 0;
ICryptoTransform transform = getServiceProvider(action, key, IV);
CryptoStream cryptoStream = null;
switch (action)
{
case cryptoAction.Encrypt:
cryptoStream = new CryptoStream(fsOut, transform, CryptoStreamMode.Write);
break;
case cryptoAction.Decrypt:
cryptoStream = new CryptoStream(fsOut, transform, CryptoStreamMode.Write);
break;
}
while ((bytesProcesed < fileLength))
{
bytesInBlock = fsIn.Read(byteBuffer, 0, 4096);
cryptoStream.Write(byteBuffer, 0, bytesInBlock);
bytesProcesed = (bytesProcesed + long.Parse(bytesInBlock.ToString()));
}
if (!(cryptoStream == null))
{
cryptoStream.Close();
}
fsIn.Close();
fsOut.Close();
_returnErrorCode = "";
return true;
}
else
{
return false;
}
}
catch (Exception ex)
{
ISException.RegisterExcepcion(ex);
return false;
}
}
internal ICryptoTransform getServiceProvider(cryptoAction cAction, byte[] key, byte[] IV)
{
ICryptoTransform transform = null;
switch (algorithm)
{
case cryptoProvider.DES:
var des = new DESCryptoServiceProvider();
switch (cAction)
{
case cryptoAction.Encrypt:
// si estamos cifrando, creamos el objeto cifrador.
transform = des.CreateEncryptor(key, IV);
break;
case cryptoAction.Decrypt:
// si estamos descifrando, creamos el objeto descifrador.
transform = des.CreateDecryptor(key, IV);
break;
}
return(transform);
case cryptoProvider.TripleDES:
var des3 = new TripleDESCryptoServiceProvider();
switch (cAction)
{
case cryptoAction.Encrypt:
transform = des3.CreateEncryptor(key, IV);
break;
case cryptoAction.Decrypt:
transform = des3.CreateDecryptor(key, IV);
break;
}
return(transform);
case cryptoProvider.RC2:
var rc2 = new RC2CryptoServiceProvider();
switch (cAction)
{
case cryptoAction.Encrypt:
transform = rc2.CreateEncryptor(key, IV);
break;
case cryptoAction.Decrypt:
transform = rc2.CreateDecryptor(key, IV);
break;
}
return(transform);
case cryptoProvider.Rijndael:
var rijndael = new RijndaelManaged();
switch (cAction)
{
case cryptoAction.Encrypt:
transform = rijndael.CreateEncryptor(key, IV);
break;
case cryptoAction.Decrypt:
transform = rijndael.CreateDecryptor(key, IV);
break;
}
return(transform);
default:
throw new CryptographicException("Error al inicializar al proveedor de cifrado");
}
}