RC2CryptoServiceProvider.GenerateKey 메서드
알고리즘에 사용할 임의의 키(Key)를 생성합니다.
네임스페이스: System.Security.Cryptography
어셈블리: mscorlib(mscorlib.dll)
구문
‘선언
Public Overrides Sub GenerateKey
‘사용 방법
Dim instance As RC2CryptoServiceProvider
instance.GenerateKey
public override void GenerateKey ()
public:
virtual void GenerateKey () override
public void GenerateKey ()
public override function GenerateKey ()
설명
아무 것도 지정되지 않은 경우에는 이 메서드를 사용하여 난수 키를 생성합니다.
RC2CryptoServiceProvider 구현에서는 한 번에 8비트씩 증가하는 40비트에서 128비트까지의 키 길이를 지원합니다.
예제
다음 코드 예제에서는 문자열을 암호화한 다음 해독합니다.
Imports System
Imports System.IO
Imports System.Text
Imports System.Security.Cryptography
Module MyMainModule
Sub Main()
' Create a new instance of the RC2CryptoServiceProvider class
' and automatically generate a Key and IV.
Dim rc2CSP As New RC2CryptoServiceProvider()
Console.WriteLine("Effective key size is {0} bits.", rc2CSP.EffectiveKeySize)
' Get the key and IV.
Dim key As Byte() = rc2CSP.Key
Dim IV As Byte() = rc2CSP.IV
' Get an encryptor.
Dim encryptor As ICryptoTransform = rc2CSP.CreateEncryptor(key, IV)
' Encrypt the data as an array of encrypted bytes in memory.
Dim msEncrypt As New MemoryStream()
Dim csEncrypt As New CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)
' Convert the data to a byte array.
Dim original As String = "Here is some data to encrypt."
Dim toEncrypt As Byte() = Encoding.ASCII.GetBytes(original)
' Write all data to the crypto stream and flush it.
csEncrypt.Write(toEncrypt, 0, toEncrypt.Length)
csEncrypt.FlushFinalBlock()
' Get the encrypted array of bytes.
Dim encrypted As Byte() = msEncrypt.ToArray()
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''
' This is where the data could be transmitted or saved.
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'Get a decryptor that uses the same key and IV as the encryptor.
Dim decryptor As ICryptoTransform = rc2CSP.CreateDecryptor(key, IV)
' Now decrypt the previously encrypted message using the decryptor
' obtained in the above step.
Dim msDecrypt As New MemoryStream(encrypted)
Dim csDecrypt As New CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)
Dim fromEncrypt(toEncrypt.Length) As Byte
' Read the data out of the crypto stream.
csDecrypt.Read(fromEncrypt, 0, toEncrypt.Length)
' Convert the byte array back into a string.
Dim roundtrip As String = Encoding.ASCII.GetString(fromEncrypt)
' Display the original data and the decrypted data.
Console.WriteLine("Original: {0}", original)
Console.WriteLine("Round Trip: {0}", roundtrip)
Console.ReadLine()
End Sub
End Module
using System;
using System.IO;
using System.Text;
using System.Security.Cryptography;
namespace RC2CryptoServiceProvider_Examples
{
class MyMainClass
{
public static void Main()
{
// Create a new instance of the RC2CryptoServiceProvider class
// and automatically generate a Key and IV.
RC2CryptoServiceProvider rc2CSP = new RC2CryptoServiceProvider();
Console.WriteLine("Effective key size is {0} bits.", rc2CSP.EffectiveKeySize);
// Get the key and IV.
byte[] key = rc2CSP.Key;
byte[] IV = rc2CSP.IV;
// Get an encryptor.
ICryptoTransform encryptor = rc2CSP.CreateEncryptor(key, IV);
// Encrypt the data as an array of encrypted bytes in memory.
MemoryStream msEncrypt = new MemoryStream();
CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write);
// Convert the data to a byte array.
string original = "Here is some data to encrypt.";
byte[] toEncrypt = Encoding.ASCII.GetBytes(original);
// Write all data to the crypto stream and flush it.
csEncrypt.Write(toEncrypt, 0, toEncrypt.Length);
csEncrypt.FlushFinalBlock();
// Get the encrypted array of bytes.
byte[] encrypted = msEncrypt.ToArray();
///////////////////////////////////////////////////////
// This is where the data could be transmitted or saved.
///////////////////////////////////////////////////////
//Get a decryptor that uses the same key and IV as the encryptor.
ICryptoTransform decryptor = rc2CSP.CreateDecryptor(key, IV);
// Now decrypt the previously encrypted message using the decryptor
// obtained in the above step.
MemoryStream msDecrypt = new MemoryStream(encrypted);
CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read);
byte[] fromEncrypt = new byte[toEncrypt.Length];
// Read the data out of the crypto stream.
csDecrypt.Read(fromEncrypt, 0, toEncrypt.Length);
// Convert the byte array back into a string.
String roundtrip = Encoding.ASCII.GetString(fromEncrypt);
// Display the original data and the decrypted data.
Console.WriteLine("Original: {0}", original);
Console.WriteLine("Round Trip: {0}", roundtrip);
Console.ReadLine();
}
}
}
플랫폼
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
.NET Framework에서 모든 플래폼의 모든 버전을 지원하지는 않습니다. 지원되는 버전의 목록은 시스템 요구 사항을 참조하십시오.
버전 정보
.NET Framework
2.0, 1.1, 1.0에서 지원
.NET Compact Framework
2.0에서 지원
참고 항목
참조
RC2CryptoServiceProvider 클래스
RC2CryptoServiceProvider 멤버
System.Security.Cryptography 네임스페이스