RC2.Create Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Creates an instance of a cryptographic object to perform the RC2 algorithm.
Overloads
| Create() |
Creates an instance of a cryptographic object to perform the RC2 algorithm. |
| Create(String) |
Creates an instance of a cryptographic object to perform the specified implementation of the RC2 algorithm. |
Create()
Creates an instance of a cryptographic object to perform the RC2 algorithm.
public:
static System::Security::Cryptography::RC2 ^ Create();
public static System.Security.Cryptography.RC2 Create ();
[System.Runtime.Versioning.UnsupportedOSPlatform("android")]
public static System.Security.Cryptography.RC2 Create ();
static member Create : unit -> System.Security.Cryptography.RC2
[<System.Runtime.Versioning.UnsupportedOSPlatform("android")>]
static member Create : unit -> System.Security.Cryptography.RC2
Public Shared Function Create () As RC2
Returns
An instance of a cryptographic object.
- Attributes
Exceptions
The algorithm was used with Federal Information Processing Standards (FIPS) mode enabled, but is not FIPS compatible.
Examples
The following example shows how to create and use an RC2 object to encrypt and decrypt data in a file.
using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Text;
using namespace System::IO;
void EncryptTextToFile( String^ Data, String^ FileName, array<Byte>^Key, array<Byte>^IV )
{
try
{
// Create or open the specified file.
FileStream^ fStream = File::Open( FileName, FileMode::OpenOrCreate );
// Create a new RC2 object.
RC2^ RC2alg = RC2::Create();
// Create a CryptoStream using the FileStream
// and the passed key and initialization vector (IV).
CryptoStream^ cStream = gcnew CryptoStream( fStream,RC2alg->CreateEncryptor( Key, IV ),CryptoStreamMode::Write );
// Create a StreamWriter using the CryptoStream.
StreamWriter^ sWriter = gcnew StreamWriter( cStream );
// Write the data to the stream
// to encrypt it.
sWriter->WriteLine( Data );
// Close the streams and
// close the file.
sWriter->Close();
cStream->Close();
fStream->Close();
}
catch ( CryptographicException^ e )
{
Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
}
catch ( UnauthorizedAccessException^ e )
{
Console::WriteLine( "A file error occurred: {0}", e->Message );
}
}
String^ DecryptTextFromFile( String^ FileName, array<Byte>^Key, array<Byte>^IV )
{
try
{
// Create or open the specified file.
FileStream^ fStream = File::Open( FileName, FileMode::OpenOrCreate );
// Create a new RC2 object.
RC2^ RC2alg = RC2::Create();
// Create a CryptoStream using the FileStream
// and the passed key and initialization vector (IV).
CryptoStream^ cStream = gcnew CryptoStream( fStream,RC2alg->CreateDecryptor( Key, IV ),CryptoStreamMode::Read );
// Create a StreamReader using the CryptoStream.
StreamReader^ sReader = gcnew StreamReader( cStream );
// Read the data from the stream
// to decrypt it.
String^ val = sReader->ReadLine();
// Close the streams and
// close the file.
sReader->Close();
cStream->Close();
fStream->Close();
// Return the string.
return val;
}
catch ( CryptographicException^ e )
{
Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
return nullptr;
}
catch ( UnauthorizedAccessException^ e )
{
Console::WriteLine( "A file error occurred: {0}", e->Message );
return nullptr;
}
}
int main()
{
try
{
// Create a new RC2 object to generate a key
// and initialization vector (IV).
RC2^ RC2alg = RC2::Create();
// Create a string to encrypt.
String^ sData = "Here is some data to encrypt.";
String^ FileName = "CText.txt";
// Encrypt text to a file using the file name, key, and IV.
EncryptTextToFile( sData, FileName, RC2alg->Key, RC2alg->IV );
// Decrypt the text from a file using the file name, key, and IV.
String^ Final = DecryptTextFromFile( FileName, RC2alg->Key, RC2alg->IV );
// Display the decrypted string to the console.
Console::WriteLine( Final );
}
catch ( Exception^ e )
{
Console::WriteLine( e->Message );
}
}
using System;
using System.Security.Cryptography;
using System.Text;
using System.IO;
class RC2Sample
{
static void Main()
{
try
{
// Create a new RC2 object to generate a key
// and initialization vector (IV).
RC2 RC2alg = RC2.Create();
// Create a string to encrypt.
string sData = "Here is some data to encrypt.";
string FileName = "CText.txt";
// Encrypt text to a file using the file name, key, and IV.
EncryptTextToFile(sData, FileName, RC2alg.Key, RC2alg.IV);
// Decrypt the text from a file using the file name, key, and IV.
string Final = DecryptTextFromFile(FileName, RC2alg.Key, RC2alg.IV);
// Display the decrypted string to the console.
Console.WriteLine(Final);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
public static void EncryptTextToFile(String Data, String FileName, byte[] Key, byte[] IV)
{
try
{
// Create or open the specified file.
FileStream fStream = File.Open(FileName,FileMode.OpenOrCreate);
// Create a new RC2 object.
RC2 RC2alg = RC2.Create();
// Create a CryptoStream using the FileStream
// and the passed key and initialization vector (IV).
CryptoStream cStream = new CryptoStream(fStream,
RC2alg.CreateEncryptor(Key,IV),
CryptoStreamMode.Write);
// Create a StreamWriter using the CryptoStream.
StreamWriter sWriter = new StreamWriter(cStream);
// Write the data to the stream
// to encrypt it.
sWriter.WriteLine(Data);
// Close the streams and
// close the file.
sWriter.Close();
cStream.Close();
fStream.Close();
}
catch(CryptographicException e)
{
Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
}
catch(UnauthorizedAccessException e)
{
Console.WriteLine("A file error occurred: {0}", e.Message);
}
}
public static string DecryptTextFromFile(String FileName, byte[] Key, byte[] IV)
{
try
{
// Create or open the specified file.
FileStream fStream = File.Open(FileName, FileMode.OpenOrCreate);
// Create a new RC2 object.
RC2 RC2alg = RC2.Create();
// Create a CryptoStream using the FileStream
// and the passed key and initialization vector (IV).
CryptoStream cStream = new CryptoStream(fStream,
RC2alg.CreateDecryptor(Key,IV),
CryptoStreamMode.Read);
// Create a StreamReader using the CryptoStream.
StreamReader sReader = new StreamReader(cStream);
// Read the data from the stream
// to decrypt it.
string val = sReader.ReadLine();
// Close the streams and
// close the file.
sReader.Close();
cStream.Close();
fStream.Close();
// Return the string.
return val;
}
catch(CryptographicException e)
{
Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
return null;
}
catch(UnauthorizedAccessException e)
{
Console.WriteLine("A file error occurred: {0}", e.Message);
return null;
}
}
}
Imports System.Security.Cryptography
Imports System.Text
Imports System.IO
Module RC2Sample
Sub Main()
Try
' Create a new RC2 object to generate a key
' and initialization vector (IV).
Dim RC2alg As RC2 = RC2.Create
' Create a string to encrypt.
Dim sData As String = "Here is some data to encrypt."
Dim FileName As String = "CText.txt"
' Encrypt text to a file using the file name, key, and IV.
EncryptTextToFile(sData, FileName, RC2alg.Key, RC2alg.IV)
' Decrypt the text from a file using the file name, key, and IV.
Dim Final As String = DecryptTextFromFile(FileName, RC2alg.Key, RC2alg.IV)
' Display the decrypted string to the console.
Console.WriteLine(Final)
Catch e As Exception
Console.WriteLine(e.Message)
End Try
End Sub
Sub EncryptTextToFile(ByVal Data As String, ByVal FileName As String, ByVal Key() As Byte, ByVal IV() As Byte)
Try
' Create or open the specified file.
Dim fStream As FileStream = File.Open(FileName, FileMode.OpenOrCreate)
' Create a new RC2 object.
Dim RC2alg As RC2 = RC2.Create
' Create a CryptoStream using the FileStream
' and the passed key and initialization vector (IV).
Dim cStream As New CryptoStream(fStream, _
RC2alg.CreateEncryptor(Key, IV), _
CryptoStreamMode.Write)
' Create a StreamWriter using the CryptoStream.
Dim sWriter As New StreamWriter(cStream)
' Write the data to the stream
' to encrypt it.
sWriter.WriteLine(Data)
' Close the streams and
' close the file.
sWriter.Close()
cStream.Close()
fStream.Close()
Catch e As CryptographicException
Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
Catch e As UnauthorizedAccessException
Console.WriteLine("A file error occurred: {0}", e.Message)
End Try
End Sub
Function DecryptTextFromFile(ByVal FileName As String, ByVal Key() As Byte, ByVal IV() As Byte) As String
Try
' Create or open the specified file.
Dim fStream As FileStream = File.Open(FileName, FileMode.OpenOrCreate)
' Create a new RC2 object.
Dim RC2alg As RC2 = RC2.Create
' Create a CryptoStream using the FileStream
' and the passed key and initialization vector (IV).
Dim cStream As New CryptoStream(fStream, _
RC2alg.CreateDecryptor(Key, IV), _
CryptoStreamMode.Read)
' Create a StreamReader using the CryptoStream.
Dim sReader As New StreamReader(cStream)
' Read the data from the stream
' to decrypt it.
Dim val As String = sReader.ReadLine()
' Close the streams and
' close the file.
sReader.Close()
cStream.Close()
fStream.Close()
' Return the string.
Return val
Catch e As CryptographicException
Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
Return Nothing
Catch e As UnauthorizedAccessException
Console.WriteLine("A file error occurred: {0}", e.Message)
Return Nothing
End Try
End Function
End Module
The following example shows how to create and use an RC2 object to encrypt and decrypt data in memory.
using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Text;
using namespace System::IO;
array<Byte>^ EncryptTextToMemory( String^ Data, array<Byte>^Key, array<Byte>^IV )
{
try
{
// Create a MemoryStream.
MemoryStream^ mStream = gcnew MemoryStream;
// Create a new RC2 object.
RC2^ RC2alg = RC2::Create();
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream^ cStream = gcnew CryptoStream( mStream,RC2alg->CreateEncryptor( Key, IV ),CryptoStreamMode::Write );
// Convert the passed string to a byte array.
array<Byte>^toEncrypt = (gcnew ASCIIEncoding)->GetBytes( Data );
// Write the byte array to the crypto stream and flush it.
cStream->Write( toEncrypt, 0, toEncrypt->Length );
cStream->FlushFinalBlock();
// Get an array of bytes from the
// MemoryStream that holds the
// encrypted data.
array<Byte>^ret = mStream->ToArray();
// Close the streams.
cStream->Close();
mStream->Close();
// Return the encrypted buffer.
return ret;
}
catch ( CryptographicException^ e )
{
Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
return nullptr;
}
}
String^ DecryptTextFromMemory( array<Byte>^Data, array<Byte>^Key, array<Byte>^IV )
{
try
{
// Create a new MemoryStream using the passed
// array of encrypted data.
MemoryStream^ msDecrypt = gcnew MemoryStream( Data );
// Create a new RC2 object.
RC2^ RC2alg = RC2::Create();
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream^ csDecrypt = gcnew CryptoStream( msDecrypt,RC2alg->CreateDecryptor( Key, IV ),CryptoStreamMode::Read );
// Create buffer to hold the decrypted data.
array<Byte>^fromEncrypt = gcnew array<Byte>(Data->Length);
// Read the decrypted data out of the crypto stream
// and place it into the temporary buffer.
csDecrypt->Read( fromEncrypt, 0, fromEncrypt->Length );
//Convert the buffer into a string and return it.
return (gcnew ASCIIEncoding)->GetString( fromEncrypt );
}
catch ( CryptographicException^ e )
{
Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
return nullptr;
}
}
int main()
{
try
{
// Create a new RC2 object to generate a key
// and initialization vector (IV).
RC2^ RC2alg = RC2::Create();
// Create a string to encrypt.
String^ sData = "Here is some data to encrypt.";
// Encrypt the string to an in-memory buffer.
array<Byte>^Data = EncryptTextToMemory( sData, RC2alg->Key, RC2alg->IV );
// Decrypt the buffer back to a string.
String^ Final = DecryptTextFromMemory( Data, RC2alg->Key, RC2alg->IV );
// Display the decrypted string to the console.
Console::WriteLine( Final );
}
catch ( Exception^ e )
{
Console::WriteLine( e->Message );
}
}
using System;
using System.Security.Cryptography;
using System.Text;
using System.IO;
class RC2Sample
{
static void Main()
{
try
{
// Create a new RC2 object to generate a key
// and initialization vector (IV).
RC2 RC2alg = RC2.Create();
// Create a string to encrypt.
string sData = "Here is some data to encrypt.";
// Encrypt the string to an in-memory buffer.
byte[] Data = EncryptTextToMemory(sData, RC2alg.Key, RC2alg.IV);
// Decrypt the buffer back to a string.
string Final = DecryptTextFromMemory(Data, RC2alg.Key, RC2alg.IV);
// Display the decrypted string to the console.
Console.WriteLine(Final);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
public static byte[] EncryptTextToMemory(string Data, byte[] Key, byte[] IV)
{
try
{
// Create a MemoryStream.
MemoryStream mStream = new MemoryStream();
// Create a new RC2 object.
RC2 RC2alg = RC2.Create();
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream cStream = new CryptoStream(mStream,
RC2alg.CreateEncryptor(Key, IV),
CryptoStreamMode.Write);
// Convert the passed string to a byte array.
byte[] toEncrypt = new ASCIIEncoding().GetBytes(Data);
// Write the byte array to the crypto stream and flush it.
cStream.Write(toEncrypt, 0, toEncrypt.Length);
cStream.FlushFinalBlock();
// Get an array of bytes from the
// MemoryStream that holds the
// encrypted data.
byte[] ret = mStream.ToArray();
// Close the streams.
cStream.Close();
mStream.Close();
// Return the encrypted buffer.
return ret;
}
catch(CryptographicException e)
{
Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
return null;
}
}
public static string DecryptTextFromMemory(byte[] Data, byte[] Key, byte[] IV)
{
try
{
// Create a new MemoryStream using the passed
// array of encrypted data.
MemoryStream msDecrypt = new MemoryStream(Data);
// Create a new RC2 object.
RC2 RC2alg = RC2.Create();
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream csDecrypt = new CryptoStream(msDecrypt,
RC2alg.CreateDecryptor(Key, IV),
CryptoStreamMode.Read);
// Create buffer to hold the decrypted data.
byte[] fromEncrypt = new byte[Data.Length];
// Read the decrypted data out of the crypto stream
// and place it into the temporary buffer.
csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);
//Convert the buffer into a string and return it.
return new ASCIIEncoding().GetString(fromEncrypt);
}
catch(CryptographicException e)
{
Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
return null;
}
}
}
Imports System.Security.Cryptography
Imports System.Text
Imports System.IO
Module RC2Sample
Sub Main()
Try
' Create a new RC2 object to generate a key
' and initialization vector (IV).
Dim RC2alg As RC2 = RC2.Create
' Create a string to encrypt.
Dim sData As String = "Here is some data to encrypt."
' Encrypt the string to an in-memory buffer.
Dim Data As Byte() = EncryptTextToMemory(sData, RC2alg.Key, RC2alg.IV)
' Decrypt the buffer back to a string.
Dim Final As String = DecryptTextFromMemory(Data, RC2alg.Key, RC2alg.IV)
' Display the decrypted string to the console.
Console.WriteLine(Final)
Catch e As Exception
Console.WriteLine(e.Message)
End Try
End Sub
Function EncryptTextToMemory(ByVal Data As String, ByVal Key() As Byte, ByVal IV() As Byte) As Byte()
Try
' Create a MemoryStream.
Dim mStream As New MemoryStream
' Create a new RC2 object.
Dim RC2alg As RC2 = RC2.Create
' Create a CryptoStream using the MemoryStream
' and the passed key and initialization vector (IV).
Dim cStream As New CryptoStream(mStream, _
RC2alg.CreateEncryptor(Key, IV), _
CryptoStreamMode.Write)
' Convert the passed string to a byte array.
Dim toEncrypt As Byte() = New ASCIIEncoding().GetBytes(Data)
' Write the byte array to the crypto stream and flush it.
cStream.Write(toEncrypt, 0, toEncrypt.Length)
cStream.FlushFinalBlock()
' Get an array of bytes from the
' MemoryStream that holds the
' encrypted data.
Dim ret As Byte() = mStream.ToArray()
' Close the streams.
cStream.Close()
mStream.Close()
' Return the encrypted buffer.
Return ret
Catch e As CryptographicException
Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
Return Nothing
End Try
End Function
Function DecryptTextFromMemory(ByVal Data() As Byte, ByVal Key() As Byte, ByVal IV() As Byte) As String
Try
' Create a new MemoryStream using the passed
' array of encrypted data.
Dim msDecrypt As New MemoryStream(Data)
' Create a new RC2 object.
Dim RC2alg As RC2 = RC2.Create
' Create a CryptoStream using the MemoryStream
' and the passed key and initialization vector (IV).
Dim csDecrypt As New CryptoStream(msDecrypt, _
RC2alg.CreateDecryptor(Key, IV), _
CryptoStreamMode.Read)
' Create buffer to hold the decrypted data.
Dim fromEncrypt(Data.Length - 1) As Byte
' Read the decrypted data out of the crypto stream
' and place it into the temporary buffer.
csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length)
'Convert the buffer into a string and return it.
Return New ASCIIEncoding().GetString(fromEncrypt)
Catch e As CryptographicException
Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
Return Nothing
End Try
End Function
End Module
Remarks
Use this method to create an instance of the RC2 class that you can use to encrypt and decrypt data.
See also
Applies to
Create(String)
Creates an instance of a cryptographic object to perform the specified implementation of the RC2 algorithm.
public:
static System::Security::Cryptography::RC2 ^ Create(System::String ^ AlgName);
public static System.Security.Cryptography.RC2? Create (string AlgName);
public static System.Security.Cryptography.RC2 Create (string AlgName);
static member Create : string -> System.Security.Cryptography.RC2
Public Shared Function Create (AlgName As String) As RC2
Parameters
Returns
An instance of a cryptographic object.
Exceptions
The algorithm described by the algName parameter was used with Federal Information Processing Standards (FIPS) mode enabled, but is not FIPS compatible.
Examples
The following example shows how to create and use an RC2 object to encrypt and decrypt data in a file.
using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Text;
using namespace System::IO;
void EncryptTextToFile( String^ Data, String^ FileName, array<Byte>^Key, array<Byte>^IV )
{
try
{
// Create or open the specified file.
FileStream^ fStream = File::Open( FileName, FileMode::OpenOrCreate );
// Create a new RC2 object.
RC2^ RC2alg = RC2::Create();
// Create a CryptoStream using the FileStream
// and the passed key and initialization vector (IV).
CryptoStream^ cStream = gcnew CryptoStream( fStream,RC2alg->CreateEncryptor( Key, IV ),CryptoStreamMode::Write );
// Create a StreamWriter using the CryptoStream.
StreamWriter^ sWriter = gcnew StreamWriter( cStream );
// Write the data to the stream
// to encrypt it.
sWriter->WriteLine( Data );
// Close the streams and
// close the file.
sWriter->Close();
cStream->Close();
fStream->Close();
}
catch ( CryptographicException^ e )
{
Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
}
catch ( UnauthorizedAccessException^ e )
{
Console::WriteLine( "A file error occurred: {0}", e->Message );
}
}
String^ DecryptTextFromFile( String^ FileName, array<Byte>^Key, array<Byte>^IV )
{
try
{
// Create or open the specified file.
FileStream^ fStream = File::Open( FileName, FileMode::OpenOrCreate );
// Create a new RC2 object.
RC2^ RC2alg = RC2::Create();
// Create a CryptoStream using the FileStream
// and the passed key and initialization vector (IV).
CryptoStream^ cStream = gcnew CryptoStream( fStream,RC2alg->CreateDecryptor( Key, IV ),CryptoStreamMode::Read );
// Create a StreamReader using the CryptoStream.
StreamReader^ sReader = gcnew StreamReader( cStream );
// Read the data from the stream
// to decrypt it.
String^ val = sReader->ReadLine();
// Close the streams and
// close the file.
sReader->Close();
cStream->Close();
fStream->Close();
// Return the string.
return val;
}
catch ( CryptographicException^ e )
{
Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
return nullptr;
}
catch ( UnauthorizedAccessException^ e )
{
Console::WriteLine( "A file error occurred: {0}", e->Message );
return nullptr;
}
}
int main()
{
try
{
// Create a new RC2 object to generate a key
// and initialization vector (IV). Specify one
// of the recognized simple names for this
// algorithm.
RC2^ RC2alg = RC2::Create( "RC2" );
// Create a string to encrypt.
String^ sData = "Here is some data to encrypt.";
String^ FileName = "CText.txt";
// Encrypt text to a file using the file name, key, and IV.
EncryptTextToFile( sData, FileName, RC2alg->Key, RC2alg->IV );
// Decrypt the text from a file using the file name, key, and IV.
String^ Final = DecryptTextFromFile( FileName, RC2alg->Key, RC2alg->IV );
// Display the decrypted string to the console.
Console::WriteLine( Final );
}
catch ( Exception^ e )
{
Console::WriteLine( e->Message );
}
}
using System;
using System.Security.Cryptography;
using System.Text;
using System.IO;
class RC2Sample
{
static void Main()
{
try
{
// Create a new RC2 object to generate a key
// and initialization vector (IV). Specify one
// of the recognized simple names for this
// algorithm.
RC2 RC2alg = RC2.Create("RC2");
// Create a string to encrypt.
string sData = "Here is some data to encrypt.";
string FileName = "CText.txt";
// Encrypt text to a file using the file name, key, and IV.
EncryptTextToFile(sData, FileName, RC2alg.Key, RC2alg.IV);
// Decrypt the text from a file using the file name, key, and IV.
string Final = DecryptTextFromFile(FileName, RC2alg.Key, RC2alg.IV);
// Display the decrypted string to the console.
Console.WriteLine(Final);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
public static void EncryptTextToFile(String Data, String FileName, byte[] Key, byte[] IV)
{
try
{
// Create or open the specified file.
FileStream fStream = File.Open(FileName,FileMode.OpenOrCreate);
// Create a new RC2 object.
RC2 RC2alg = RC2.Create();
// Create a CryptoStream using the FileStream
// and the passed key and initialization vector (IV).
CryptoStream cStream = new CryptoStream(fStream,
RC2alg.CreateEncryptor(Key,IV),
CryptoStreamMode.Write);
// Create a StreamWriter using the CryptoStream.
StreamWriter sWriter = new StreamWriter(cStream);
// Write the data to the stream
// to encrypt it.
sWriter.WriteLine(Data);
// Close the streams and
// close the file.
sWriter.Close();
cStream.Close();
fStream.Close();
}
catch(CryptographicException e)
{
Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
}
catch(UnauthorizedAccessException e)
{
Console.WriteLine("A file error occurred: {0}", e.Message);
}
}
public static string DecryptTextFromFile(String FileName, byte[] Key, byte[] IV)
{
try
{
// Create or open the specified file.
FileStream fStream = File.Open(FileName, FileMode.OpenOrCreate);
// Create a new RC2 object.
RC2 RC2alg = RC2.Create();
// Create a CryptoStream using the FileStream
// and the passed key and initialization vector (IV).
CryptoStream cStream = new CryptoStream(fStream,
RC2alg.CreateDecryptor(Key,IV),
CryptoStreamMode.Read);
// Create a StreamReader using the CryptoStream.
StreamReader sReader = new StreamReader(cStream);
// Read the data from the stream
// to decrypt it.
string val = sReader.ReadLine();
// Close the streams and
// close the file.
sReader.Close();
cStream.Close();
fStream.Close();
// Return the string.
return val;
}
catch(CryptographicException e)
{
Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
return null;
}
catch(UnauthorizedAccessException e)
{
Console.WriteLine("A file error occurred: {0}", e.Message);
return null;
}
}
}
Imports System.Security.Cryptography
Imports System.Text
Imports System.IO
Module RC2Sample
Sub Main()
Try
' Create a new RC2 object to generate a key
' and initialization vector (IV). Specify one
' of the recognized simple names for this
' algorithm.
Dim RC2alg As RC2 = RC2.Create("RC2")
' Create a string to encrypt.
Dim sData As String = "Here is some data to encrypt."
Dim FileName As String = "CText.txt"
' Encrypt text to a file using the file name, key, and IV.
EncryptTextToFile(sData, FileName, RC2alg.Key, RC2alg.IV)
' Decrypt the text from a file using the file name, key, and IV.
Dim Final As String = DecryptTextFromFile(FileName, RC2alg.Key, RC2alg.IV)
' Display the decrypted string to the console.
Console.WriteLine(Final)
Catch e As Exception
Console.WriteLine(e.Message)
End Try
End Sub
Sub EncryptTextToFile(ByVal Data As String, ByVal FileName As String, ByVal Key() As Byte, ByVal IV() As Byte)
Try
' Create or open the specified file.
Dim fStream As FileStream = File.Open(FileName, FileMode.OpenOrCreate)
' Create a new RC2 object.
Dim RC2alg As RC2 = RC2.Create
' Create a CryptoStream using the FileStream
' and the passed key and initialization vector (IV).
Dim cStream As New CryptoStream(fStream, _
RC2alg.CreateEncryptor(Key, IV), _
CryptoStreamMode.Write)
' Create a StreamWriter using the CryptoStream.
Dim sWriter As New StreamWriter(cStream)
' Write the data to the stream
' to encrypt it.
sWriter.WriteLine(Data)
' Close the streams and
' close the file.
sWriter.Close()
cStream.Close()
fStream.Close()
Catch e As CryptographicException
Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
Catch e As UnauthorizedAccessException
Console.WriteLine("A file error occurred: {0}", e.Message)
End Try
End Sub
Function DecryptTextFromFile(ByVal FileName As String, ByVal Key() As Byte, ByVal IV() As Byte) As String
Try
' Create or open the specified file.
Dim fStream As FileStream = File.Open(FileName, FileMode.OpenOrCreate)
' Create a new RC2 object.
Dim RC2alg As RC2 = RC2.Create
' Create a CryptoStream using the FileStream
' and the passed key and initialization vector (IV).
Dim cStream As New CryptoStream(fStream, _
RC2alg.CreateDecryptor(Key, IV), _
CryptoStreamMode.Read)
' Create a StreamReader using the CryptoStream.
Dim sReader As New StreamReader(cStream)
' Read the data from the stream
' to decrypt it.
Dim val As String = sReader.ReadLine()
' Close the streams and
' close the file.
sReader.Close()
cStream.Close()
fStream.Close()
' Return the string.
Return val
Catch e As CryptographicException
Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
Return Nothing
Catch e As UnauthorizedAccessException
Console.WriteLine("A file error occurred: {0}", e.Message)
Return Nothing
End Try
End Function
End Module
The following example shows how to create and use an RC2 object to encrypt and decrypt data in memory.
using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Text;
using namespace System::IO;
array<Byte>^ EncryptTextToMemory( String^ Data, array<Byte>^Key, array<Byte>^IV )
{
try
{
// Create a MemoryStream.
MemoryStream^ mStream = gcnew MemoryStream;
// Create a new RC2 object.
RC2^ RC2alg = RC2::Create();
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream^ cStream = gcnew CryptoStream( mStream,RC2alg->CreateEncryptor( Key, IV ),CryptoStreamMode::Write );
// Convert the passed string to a byte array.
array<Byte>^toEncrypt = (gcnew ASCIIEncoding)->GetBytes( Data );
// Write the byte array to the crypto stream and flush it.
cStream->Write( toEncrypt, 0, toEncrypt->Length );
cStream->FlushFinalBlock();
// Get an array of bytes from the
// MemoryStream that holds the
// encrypted data.
array<Byte>^ret = mStream->ToArray();
// Close the streams.
cStream->Close();
mStream->Close();
// Return the encrypted buffer.
return ret;
}
catch ( CryptographicException^ e )
{
Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
return nullptr;
}
}
String^ DecryptTextFromMemory( array<Byte>^Data, array<Byte>^Key, array<Byte>^IV )
{
try
{
// Create a new MemoryStream using the passed
// array of encrypted data.
MemoryStream^ msDecrypt = gcnew MemoryStream( Data );
// Create a new RC2 object.
RC2^ RC2alg = RC2::Create();
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream^ csDecrypt = gcnew CryptoStream( msDecrypt,RC2alg->CreateDecryptor( Key, IV ),CryptoStreamMode::Read );
// Create buffer to hold the decrypted data.
array<Byte>^fromEncrypt = gcnew array<Byte>(Data->Length);
// Read the decrypted data out of the crypto stream
// and place it into the temporary buffer.
csDecrypt->Read( fromEncrypt, 0, fromEncrypt->Length );
//Convert the buffer into a string and return it.
return (gcnew ASCIIEncoding)->GetString( fromEncrypt );
}
catch ( CryptographicException^ e )
{
Console::WriteLine( "A Cryptographic error occurred: {0}", e->Message );
return nullptr;
}
}
int main()
{
try
{
// Create a new RC2 object to generate a key
// and initialization vector (IV). Specify one
// of the recognized simple names for this
// algorithm.
RC2^ RC2alg = RC2::Create( "RC2" );
// Create a string to encrypt.
String^ sData = "Here is some data to encrypt.";
// Encrypt the string to an in-memory buffer.
array<Byte>^Data = EncryptTextToMemory( sData, RC2alg->Key, RC2alg->IV );
// Decrypt the buffer back to a string.
String^ Final = DecryptTextFromMemory( Data, RC2alg->Key, RC2alg->IV );
// Display the decrypted string to the console.
Console::WriteLine( Final );
}
catch ( Exception^ e )
{
Console::WriteLine( e->Message );
}
}
using System;
using System.Security.Cryptography;
using System.Text;
using System.IO;
class RC2Sample
{
static void Main()
{
try
{
// Create a new RC2 object to generate a key
// and initialization vector (IV). Specify one
// of the recognized simple names for this
// algorithm.
RC2 RC2alg = RC2.Create("RC2");
// Create a string to encrypt.
string sData = "Here is some data to encrypt.";
// Encrypt the string to an in-memory buffer.
byte[] Data = EncryptTextToMemory(sData, RC2alg.Key, RC2alg.IV);
// Decrypt the buffer back to a string.
string Final = DecryptTextFromMemory(Data, RC2alg.Key, RC2alg.IV);
// Display the decrypted string to the console.
Console.WriteLine(Final);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
}
public static byte[] EncryptTextToMemory(string Data, byte[] Key, byte[] IV)
{
try
{
// Create a MemoryStream.
MemoryStream mStream = new MemoryStream();
// Create a new RC2 object.
RC2 RC2alg = RC2.Create();
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream cStream = new CryptoStream(mStream,
RC2alg.CreateEncryptor(Key, IV),
CryptoStreamMode.Write);
// Convert the passed string to a byte array.
byte[] toEncrypt = new ASCIIEncoding().GetBytes(Data);
// Write the byte array to the crypto stream and flush it.
cStream.Write(toEncrypt, 0, toEncrypt.Length);
cStream.FlushFinalBlock();
// Get an array of bytes from the
// MemoryStream that holds the
// encrypted data.
byte[] ret = mStream.ToArray();
// Close the streams.
cStream.Close();
mStream.Close();
// Return the encrypted buffer.
return ret;
}
catch(CryptographicException e)
{
Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
return null;
}
}
public static string DecryptTextFromMemory(byte[] Data, byte[] Key, byte[] IV)
{
try
{
// Create a new MemoryStream using the passed
// array of encrypted data.
MemoryStream msDecrypt = new MemoryStream(Data);
// Create a new RC2 object.
RC2 RC2alg = RC2.Create();
// Create a CryptoStream using the MemoryStream
// and the passed key and initialization vector (IV).
CryptoStream csDecrypt = new CryptoStream(msDecrypt,
RC2alg.CreateDecryptor(Key, IV),
CryptoStreamMode.Read);
// Create buffer to hold the decrypted data.
byte[] fromEncrypt = new byte[Data.Length];
// Read the decrypted data out of the crypto stream
// and place it into the temporary buffer.
csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);
//Convert the buffer into a string and return it.
return new ASCIIEncoding().GetString(fromEncrypt);
}
catch(CryptographicException e)
{
Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
return null;
}
}
}
Imports System.Security.Cryptography
Imports System.Text
Imports System.IO
Module RC2PSample
Sub Main()
Try
' Create a new RC2 object to generate a key
' and initialization vector (IV). Specify one
' of the recognized simple names for this
' algorithm.
Dim RC2alg As RC2 = RC2.Create("RC2")
' Create a string to encrypt.
Dim sData As String = "Here is some data to encrypt."
' Encrypt the string to an in-memory buffer.
Dim Data As Byte() = EncryptTextToMemory(sData, RC2alg.Key, RC2alg.IV)
' Decrypt the buffer back to a string.
Dim Final As String = DecryptTextFromMemory(Data, RC2alg.Key, RC2alg.IV)
' Display the decrypted string to the console.
Console.WriteLine(Final)
Catch e As Exception
Console.WriteLine(e.Message)
End Try
End Sub
Function EncryptTextToMemory(ByVal Data As String, ByVal Key() As Byte, ByVal IV() As Byte) As Byte()
Try
' Create a MemoryStream.
Dim mStream As New MemoryStream
' Create a new RC2 object.
Dim RC2alg As RC2 = RC2.Create
' Create a CryptoStream using the MemoryStream
' and the passed key and initialization vector (IV).
Dim cStream As New CryptoStream(mStream, _
RC2alg.CreateEncryptor(Key, IV), _
CryptoStreamMode.Write)
' Convert the passed string to a byte array.
Dim toEncrypt As Byte() = New ASCIIEncoding().GetBytes(Data)
' Write the byte array to the crypto stream and flush it.
cStream.Write(toEncrypt, 0, toEncrypt.Length)
cStream.FlushFinalBlock()
' Get an array of bytes from the
' MemoryStream that holds the
' encrypted data.
Dim ret As Byte() = mStream.ToArray()
' Close the streams.
cStream.Close()
mStream.Close()
' Return the encrypted buffer.
Return ret
Catch e As CryptographicException
Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
Return Nothing
End Try
End Function
Function DecryptTextFromMemory(ByVal Data() As Byte, ByVal Key() As Byte, ByVal IV() As Byte) As String
Try
' Create a new MemoryStream using the passed
' array of encrypted data.
Dim msDecrypt As New MemoryStream(Data)
' Create a new RC2 object.
Dim RC2alg As RC2 = RC2.Create
' Create a CryptoStream using the MemoryStream
' and the passed key and initialization vector (IV).
Dim csDecrypt As New CryptoStream(msDecrypt, _
RC2alg.CreateDecryptor(Key, IV), _
CryptoStreamMode.Read)
' Create buffer to hold the decrypted data.
Dim fromEncrypt(Data.Length - 1) As Byte
' Read the decrypted data out of the crypto stream
' and place it into the temporary buffer.
csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length)
'Convert the buffer into a string and return it.
Return New ASCIIEncoding().GetString(fromEncrypt)
Catch e As CryptographicException
Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
Return Nothing
End Try
End Function
End Module
Remarks
Use this method to create an instance of the RC2 class that you can use to encrypt and decrypt data.