TripleDESCryptoServiceProvider クラス
アセンブリ: mscorlib (mscorlib.dll 内)

<ComVisibleAttribute(True)> _ Public NotInheritable Class TripleDESCryptoServiceProvider Inherits TripleDES
[ComVisibleAttribute(true)] public ref class TripleDESCryptoServiceProvider sealed : public TripleDES


TripleDESCryptoServiceProvider オブジェクトを作成し、そのオブジェクトを使ってファイル内のデータを暗号化および復号化する方法を次のコード例に示します。
Imports System.Security.Cryptography Imports System.Text Imports System.IO Module TrippleDESCSPSample Sub Main() Try ' Create a new TripleDESCryptoServiceProvider object ' to generate a key and initialization vector (IV). Dim tDESalg As New TripleDESCryptoServiceProvider ' 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, tDESalg.Key, tDESalg.IV) ' Decrypt the text from a file using the file name, key, and IV. Dim Final As String = DecryptTextFromFile(FileName, tDESalg.Key, tDESalg.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 CryptoStream using the FileStream ' and the passed key and initialization vector (IV). Dim cStream As New CryptoStream(fStream, _ New TripleDESCryptoServiceProvider().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 CryptoStream using the FileStream ' and the passed key and initialization vector (IV). Dim cStream As New CryptoStream(fStream, _ New TripleDESCryptoServiceProvider().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
using System; using System.Security.Cryptography; using System.Text; using System.IO; class TrippleDESCSPSample { static void Main() { try { // Create a new TripleDESCryptoServiceProvider object // to generate a key and initialization vector (IV). TripleDESCryptoServiceProvider tDESalg = new TripleDESCryptoServiceProvider(); // 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, tDESalg.Key, tDESalg.IV); // Decrypt the text from a file using the file name, key, and IV. string Final = DecryptTextFromFile(FileName, tDESalg.Key, tDESalg.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 CryptoStream using the FileStream // and the passed key and initialization vector (IV). CryptoStream cStream = new CryptoStream(fStream, new TripleDESCryptoServiceProvider().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 access 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 CryptoStream using the FileStream // and the passed key and initialization vector (IV). CryptoStream cStream = new CryptoStream(fStream, new TripleDESCryptoServiceProvider().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 access error occurred: {0}", e.Message); return null; } } }
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 CryptoStream using the FileStream // and the passed key and initialization vector (IV). CryptoStream^ cStream = gcnew CryptoStream( fStream,(gcnew TripleDESCryptoServiceProvider)->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 access 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 CryptoStream using the FileStream // and the passed key and initialization vector (IV). CryptoStream^ cStream = gcnew CryptoStream( fStream,(gcnew TripleDESCryptoServiceProvider)->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 access error occurred: {0}", e->Message ); return nullptr; } } int main() { try { // Create a new TripleDESCryptoServiceProvider object // to generate a key and initialization vector (IV). TripleDESCryptoServiceProvider^ tDESalg = gcnew TripleDESCryptoServiceProvider; // 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, tDESalg->Key, tDESalg->IV ); // Decrypt the text from a file using the file name, key, and IV. String^ Final = DecryptTextFromFile( FileName, tDESalg->Key, tDESalg->IV ); // Display the decrypted string to the console. Console::WriteLine( Final ); } catch ( Exception^ e ) { Console::WriteLine( e->Message ); } }
import System.*; import System.Security.Cryptography.*; import System.Text.*; import System.IO.*; class TrippleDESCSPSample { public static void main(String[] args) { try { // Create a new TripleDESCryptoServiceProvider object // to generate a key and initialization vector (iv). TripleDESCryptoServiceProvider tDESalg = new TripleDESCryptoServiceProvider(); // 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, tDESalg.get_Key(), tDESalg.get_IV()); // Decrypt the text from a file using the file name, key, and iv. String strFinal = DecryptTextFromFile(fileName, tDESalg.get_Key(), tDESalg.get_IV()); // Display the decrypted string to the console. Console.WriteLine(strFinal); } catch (System.Exception e) { Console.WriteLine(e.get_Message()); } } //main public static void EncryptTextToFile(String data, String fileName, ubyte key[], ubyte iv[]) { try { // Create or open the specified file. FileStream fStream = File.Open(fileName, FileMode.OpenOrCreate); // Create a CryptoStream using the FileStream // and the passed key and initialization vector (iv). CryptoStream cStream = new CryptoStream(fStream, (new TripleDESCryptoServiceProvider()).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.get_Message()); } catch (UnauthorizedAccessException e) { Console.WriteLine("A file access error occurred: {0}", e.get_Message()); } } //EncryptTextToFile public static String DecryptTextFromFile(String fileName, ubyte key[], ubyte iv[]) { try { // Create or open the specified file. FileStream fStream = File.Open(fileName, FileMode.OpenOrCreate); // Create a CryptoStream using the FileStream // and the passed key and initialization vector (iv). CryptoStream cStream = new CryptoStream(fStream, (new TripleDESCryptoServiceProvider()).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.get_Message()); return null; } catch (UnauthorizedAccessException e) { Console.WriteLine("A file access error occurred: {0}", e.get_Message()); return null; } } //DecryptTextFromFile } //TrippleDESCSPSample
TripleDESCryptoServiceProvider オブジェクトを作成し、そのオブジェクトを使ってメモリ内のデータを暗号化および復号化する方法を次のコード例に示します。
Imports System.Security.Cryptography Imports System.Text Imports System.IO Module TrippleDESCSPSample Sub Main() Try ' Create a new TripleDESCryptoServiceProvider object ' to generate a key and initialization vector (IV). Dim tDESalg As New TripleDESCryptoServiceProvider ' 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, tDESalg.Key, tDESalg.IV) ' Decrypt the buffer back to a string. Dim Final As String = DecryptTextFromMemory(Data, tDESalg.Key, tDESalg.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 CryptoStream using the MemoryStream ' and the passed key and initialization vector (IV). Dim cStream As New CryptoStream(mStream, _ New TripleDESCryptoServiceProvider().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 CryptoStream using the MemoryStream ' and the passed key and initialization vector (IV). Dim csDecrypt As New CryptoStream(msDecrypt, _ New TripleDESCryptoServiceProvider().CreateDecryptor(Key, IV), _ CryptoStreamMode.Read) ' Create buffer to hold the decrypted data. Dim fromEncrypt(Data.Length) 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
using System; using System.Security.Cryptography; using System.Text; using System.IO; class TrippleDESCSPSample { static void Main() { try { // Create a new TripleDESCryptoServiceProvider object // to generate a key and initialization vector (IV). TripleDESCryptoServiceProvider tDESalg = new TripleDESCryptoServiceProvider(); // 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, tDESalg.Key, tDESalg.IV); // Decrypt the buffer back to a string. string Final = DecryptTextFromMemory(Data, tDESalg.Key, tDESalg.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 CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream cStream = new CryptoStream(mStream, new TripleDESCryptoServiceProvider().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 CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream csDecrypt = new CryptoStream(msDecrypt, new TripleDESCryptoServiceProvider().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; } } }
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 CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream^ cStream = gcnew CryptoStream( mStream,(gcnew TripleDESCryptoServiceProvider)->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 CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream^ csDecrypt = gcnew CryptoStream( msDecrypt,(gcnew TripleDESCryptoServiceProvider)->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 TripleDESCryptoServiceProvider object // to generate a key and initialization vector (IV). TripleDESCryptoServiceProvider^ tDESalg = gcnew TripleDESCryptoServiceProvider; // 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, tDESalg->Key, tDESalg->IV ); // Decrypt the buffer back to a string. String^ Final = DecryptTextFromMemory( Data, tDESalg->Key, tDESalg->IV ); // Display the decrypted string to the console. Console::WriteLine( Final ); } catch ( Exception^ e ) { Console::WriteLine( e->Message ); } }

System.Security.Cryptography.SymmetricAlgorithm
System.Security.Cryptography.TripleDES
System.Security.Cryptography.TripleDESCryptoServiceProvider


Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。


TripleDESCryptoServiceProvider コンストラクタ
アセンブリ: mscorlib (mscorlib.dll 内)



TripleDESCryptoServiceProvider オブジェクトを作成し、そのオブジェクトを使ってファイル内のデータを暗号化および復号化する方法を次のコード例に示します。
Imports System.Security.Cryptography Imports System.Text Imports System.IO Module TrippleDESCSPSample Sub Main() Try ' Create a new TripleDESCryptoServiceProvider object ' to generate a key and initialization vector (IV). Dim tDESalg As New TripleDESCryptoServiceProvider ' 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, tDESalg.Key, tDESalg.IV) ' Decrypt the text from a file using the file name, key, and IV. Dim Final As String = DecryptTextFromFile(FileName, tDESalg.Key, tDESalg.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 CryptoStream using the FileStream ' and the passed key and initialization vector (IV). Dim cStream As New CryptoStream(fStream, _ New TripleDESCryptoServiceProvider().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 CryptoStream using the FileStream ' and the passed key and initialization vector (IV). Dim cStream As New CryptoStream(fStream, _ New TripleDESCryptoServiceProvider().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
using System; using System.Security.Cryptography; using System.Text; using System.IO; class TrippleDESCSPSample { static void Main() { try { // Create a new TripleDESCryptoServiceProvider object // to generate a key and initialization vector (IV). TripleDESCryptoServiceProvider tDESalg = new TripleDESCryptoServiceProvider(); // 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, tDESalg.Key, tDESalg.IV); // Decrypt the text from a file using the file name, key, and IV. string Final = DecryptTextFromFile(FileName, tDESalg.Key, tDESalg.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 CryptoStream using the FileStream // and the passed key and initialization vector (IV). CryptoStream cStream = new CryptoStream(fStream, new TripleDESCryptoServiceProvider().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 access 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 CryptoStream using the FileStream // and the passed key and initialization vector (IV). CryptoStream cStream = new CryptoStream(fStream, new TripleDESCryptoServiceProvider().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 access error occurred: {0}", e.Message); return null; } } }
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 CryptoStream using the FileStream // and the passed key and initialization vector (IV). CryptoStream^ cStream = gcnew CryptoStream( fStream,(gcnew TripleDESCryptoServiceProvider)->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 access 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 CryptoStream using the FileStream // and the passed key and initialization vector (IV). CryptoStream^ cStream = gcnew CryptoStream( fStream,(gcnew TripleDESCryptoServiceProvider)->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 access error occurred: {0}", e->Message ); return nullptr; } } int main() { try { // Create a new TripleDESCryptoServiceProvider object // to generate a key and initialization vector (IV). TripleDESCryptoServiceProvider^ tDESalg = gcnew TripleDESCryptoServiceProvider; // 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, tDESalg->Key, tDESalg->IV ); // Decrypt the text from a file using the file name, key, and IV. String^ Final = DecryptTextFromFile( FileName, tDESalg->Key, tDESalg->IV ); // Display the decrypted string to the console. Console::WriteLine( Final ); } catch ( Exception^ e ) { Console::WriteLine( e->Message ); } }
import System.*; import System.Security.Cryptography.*; import System.Text.*; import System.IO.*; class TrippleDESCSPSample { public static void main(String[] args) { try { // Create a new TripleDESCryptoServiceProvider object // to generate a key and initialization vector (iv). TripleDESCryptoServiceProvider tDESalg = new TripleDESCryptoServiceProvider(); // 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, tDESalg.get_Key(), tDESalg.get_IV()); // Decrypt the text from a file using the file name, key, and iv. String strFinal = DecryptTextFromFile(fileName, tDESalg.get_Key(), tDESalg.get_IV()); // Display the decrypted string to the console. Console.WriteLine(strFinal); } catch (System.Exception e) { Console.WriteLine(e.get_Message()); } } //main public static void EncryptTextToFile(String data, String fileName, ubyte key[], ubyte iv[]) { try { // Create or open the specified file. FileStream fStream = File.Open(fileName, FileMode.OpenOrCreate); // Create a CryptoStream using the FileStream // and the passed key and initialization vector (iv). CryptoStream cStream = new CryptoStream(fStream, (new TripleDESCryptoServiceProvider()).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.get_Message()); } catch (UnauthorizedAccessException e) { Console.WriteLine("A file access error occurred: {0}", e.get_Message()); } } //EncryptTextToFile public static String DecryptTextFromFile(String fileName, ubyte key[], ubyte iv[]) { try { // Create or open the specified file. FileStream fStream = File.Open(fileName, FileMode.OpenOrCreate); // Create a CryptoStream using the FileStream // and the passed key and initialization vector (iv). CryptoStream cStream = new CryptoStream(fStream, (new TripleDESCryptoServiceProvider()).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.get_Message()); return null; } catch (UnauthorizedAccessException e) { Console.WriteLine("A file access error occurred: {0}", e.get_Message()); return null; } } //DecryptTextFromFile } //TrippleDESCSPSample
TripleDESCryptoServiceProvider オブジェクトを作成し、そのオブジェクトを使ってメモリ内のデータを暗号化および復号化する方法を次のコード例に示します。
Imports System.Security.Cryptography Imports System.Text Imports System.IO Module TrippleDESCSPSample Sub Main() Try ' Create a new TripleDESCryptoServiceProvider object ' to generate a key and initialization vector (IV). Dim tDESalg As New TripleDESCryptoServiceProvider ' 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, tDESalg.Key, tDESalg.IV) ' Decrypt the buffer back to a string. Dim Final As String = DecryptTextFromMemory(Data, tDESalg.Key, tDESalg.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 CryptoStream using the MemoryStream ' and the passed key and initialization vector (IV). Dim cStream As New CryptoStream(mStream, _ New TripleDESCryptoServiceProvider().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 CryptoStream using the MemoryStream ' and the passed key and initialization vector (IV). Dim csDecrypt As New CryptoStream(msDecrypt, _ New TripleDESCryptoServiceProvider().CreateDecryptor(Key, IV), _ CryptoStreamMode.Read) ' Create buffer to hold the decrypted data. Dim fromEncrypt(Data.Length) 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
using System; using System.Security.Cryptography; using System.Text; using System.IO; class TrippleDESCSPSample { static void Main() { try { // Create a new TripleDESCryptoServiceProvider object // to generate a key and initialization vector (IV). TripleDESCryptoServiceProvider tDESalg = new TripleDESCryptoServiceProvider(); // 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, tDESalg.Key, tDESalg.IV); // Decrypt the buffer back to a string. string Final = DecryptTextFromMemory(Data, tDESalg.Key, tDESalg.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 CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream cStream = new CryptoStream(mStream, new TripleDESCryptoServiceProvider().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 CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream csDecrypt = new CryptoStream(msDecrypt, new TripleDESCryptoServiceProvider().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; } } }
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 CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream^ cStream = gcnew CryptoStream( mStream,(gcnew TripleDESCryptoServiceProvider)->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 CryptoStream using the MemoryStream // and the passed key and initialization vector (IV). CryptoStream^ csDecrypt = gcnew CryptoStream( msDecrypt,(gcnew TripleDESCryptoServiceProvider)->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 TripleDESCryptoServiceProvider object // to generate a key and initialization vector (IV). TripleDESCryptoServiceProvider^ tDESalg = gcnew TripleDESCryptoServiceProvider; // 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, tDESalg->Key, tDESalg->IV ); // Decrypt the buffer back to a string. String^ Final = DecryptTextFromMemory( Data, tDESalg->Key, tDESalg->IV ); // Display the decrypted string to the console. Console::WriteLine( Final ); } catch ( Exception^ e ) { Console::WriteLine( e->Message ); } }

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
開発プラットフォームの中には、.NET Framework によってサポートされていないバージョンがあります。サポートされているバージョンについては、「システム要件」を参照してください。


TripleDESCryptoServiceProvider プロパティ

名前 | 説明 | |
---|---|---|
![]() | BlockSize | 暗号操作のブロック サイズをビット単位で取得または設定します。 ( SymmetricAlgorithm から継承されます。) |
![]() | FeedbackSize | 暗号操作のフィードバック サイズをビット単位で取得または設定します。 ( SymmetricAlgorithm から継承されます。) |
![]() | IV | 対称アルゴリズムの初期化ベクタ (IV) を取得または設定します。 ( SymmetricAlgorithm から継承されます。) |
![]() | Key | TripleDES アルゴリズムの共有キーを取得または設定します。 ( TripleDES から継承されます。) |
![]() | KeySize | 対称アルゴリズムで使用する共有キーのサイズをビット単位で取得または設定します。 ( SymmetricAlgorithm から継承されます。) |
![]() | LegalBlockSizes | 対称アルゴリズムでサポートされているブロック サイズを取得します。 ( SymmetricAlgorithm から継承されます。) |
![]() | LegalKeySizes | 対称アルゴリズムでサポートされているキー サイズを取得します。 ( SymmetricAlgorithm から継承されます。) |
![]() | Mode | 対称アルゴリズムの操作モードを取得または設定します。 ( SymmetricAlgorithm から継承されます。) |
![]() | Padding | 対称アルゴリズムで使用する埋め込みモードを取得または設定します。 ( SymmetricAlgorithm から継承されます。) |

TripleDESCryptoServiceProvider メソッド

名前 | 説明 | |
---|---|---|
![]() | Clear | SymmetricAlgorithm クラスによって使用されているすべてのリソースを解放します。 ( SymmetricAlgorithm から継承されます。) |
![]() | Create | オーバーロードされます。 暗号オブジェクトのインスタンスを作成し、TripleDES アルゴリズムを実行します。 ( TripleDES から継承されます。) |
![]() | CreateDecryptor | オーバーロードされます。 対称 TripleDES 復号化オブジェクトを作成します。 |
![]() | CreateEncryptor | オーバーロードされます。 対称 TripleDES 暗号化オブジェクトを作成します。 |
![]() | Equals | オーバーロードされます。 2 つの Object インスタンスが等しいかどうかを判断します。 ( Object から継承されます。) |
![]() | GenerateIV | オーバーライドされます。 アルゴリズムに使用するランダムな初期化ベクタ (IV) を生成します。 |
![]() | GenerateKey | オーバーライドされます。 アルゴリズムで使用するランダムな Key を生成します。 |
![]() | GetHashCode | 特定の型のハッシュ関数として機能します。GetHashCode は、ハッシュ アルゴリズムや、ハッシュ テーブルのようなデータ構造での使用に適しています。 ( Object から継承されます。) |
![]() | GetType | 現在のインスタンスの Type を取得します。 ( Object から継承されます。) |
![]() | IsWeakKey | 指定したキーが脆弱かどうかを確認します。 ( TripleDES から継承されます。) |
![]() | ReferenceEquals | 指定した複数の Object インスタンスが同一かどうかを判断します。 ( Object から継承されます。) |
![]() | ToString | 現在の Object を表す String を返します。 ( Object から継承されます。) |
![]() | ValidKeySize | 指定されたキー サイズが、現在のアルゴリズムに対して有効かどうかを判断します。 ( SymmetricAlgorithm から継承されます。) |

TripleDESCryptoServiceProvider メンバ
TripleDES アルゴリズムの暗号サービス プロバイダ (CSP : Cryptographic Service Provider) バージョンにアクセスする、ラッパー オブジェクトを定義します。このクラスは継承できません。
TripleDESCryptoServiceProvider データ型で公開されるメンバを以下の表に示します。


名前 | 説明 | |
---|---|---|
![]() | BlockSize | 暗号操作のブロック サイズをビット単位で取得または設定します。(SymmetricAlgorithm から継承されます。) |
![]() | FeedbackSize | 暗号操作のフィードバック サイズをビット単位で取得または設定します。(SymmetricAlgorithm から継承されます。) |
![]() | IV | 対称アルゴリズムの初期化ベクタ (IV) を取得または設定します。(SymmetricAlgorithm から継承されます。) |
![]() | Key | TripleDES アルゴリズムの共有キーを取得または設定します。(TripleDES から継承されます。) |
![]() | KeySize | 対称アルゴリズムで使用する共有キーのサイズをビット単位で取得または設定します。(SymmetricAlgorithm から継承されます。) |
![]() | LegalBlockSizes | 対称アルゴリズムでサポートされているブロック サイズを取得します。(SymmetricAlgorithm から継承されます。) |
![]() | LegalKeySizes | 対称アルゴリズムでサポートされているキー サイズを取得します。(SymmetricAlgorithm から継承されます。) |
![]() | Mode | 対称アルゴリズムの操作モードを取得または設定します。(SymmetricAlgorithm から継承されます。) |
![]() | Padding | 対称アルゴリズムで使用する埋め込みモードを取得または設定します。(SymmetricAlgorithm から継承されます。) |

名前 | 説明 | |
---|---|---|
![]() | Clear | SymmetricAlgorithm クラスによって使用されているすべてのリソースを解放します。 (SymmetricAlgorithm から継承されます。) |
![]() | Create | オーバーロードされます。 暗号オブジェクトのインスタンスを作成し、TripleDES アルゴリズムを実行します。 (TripleDES から継承されます。) |
![]() | CreateDecryptor | オーバーロードされます。 対称 TripleDES 復号化オブジェクトを作成します。 |
![]() | CreateEncryptor | オーバーロードされます。 対称 TripleDES 暗号化オブジェクトを作成します。 |
![]() | Equals | オーバーロードされます。 2 つの Object インスタンスが等しいかどうかを判断します。 (Object から継承されます。) |
![]() | GenerateIV | オーバーライドされます。 アルゴリズムに使用するランダムな初期化ベクタ (IV) を生成します。 |
![]() | GenerateKey | オーバーライドされます。 アルゴリズムで使用するランダムな Key を生成します。 |
![]() | GetHashCode | 特定の型のハッシュ関数として機能します。GetHashCode は、ハッシュ アルゴリズムや、ハッシュ テーブルのようなデータ構造での使用に適しています。 (Object から継承されます。) |
![]() | GetType | 現在のインスタンスの Type を取得します。 (Object から継承されます。) |
![]() | IsWeakKey | 指定したキーが脆弱かどうかを確認します。 (TripleDES から継承されます。) |
![]() | ReferenceEquals | 指定した複数の Object インスタンスが同一かどうかを判断します。 (Object から継承されます。) |
![]() | ToString | 現在の Object を表す String を返します。 (Object から継承されます。) |
![]() | ValidKeySize | 指定されたキー サイズが、現在のアルゴリズムに対して有効かどうかを判断します。 (SymmetricAlgorithm から継承されます。) |

- TripleDESCryptoServiceProviderのページへのリンク