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


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