RijndaelManaged.GenerateIV 方法
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
產生要使用於該演算法的隨機初始化向量 (IV)。
public:
override void GenerateIV();public override void GenerateIV ();override this.GenerateIV : unit -> unitPublic Overrides Sub GenerateIV ()範例
#using <System.dll>
using namespace System;
using namespace System::IO;
using namespace System::Security::Cryptography;
class RijndaelMemoryExample
{
public:
static array<Byte>^ encryptStringToBytes_AES(String^ plainText, array<Byte>^ Key, array<Byte>^ IV)
{
// Check arguments.
if (!plainText || plainText->Length <= 0)
throw gcnew ArgumentNullException("plainText");
if (!Key || Key->Length <= 0)
throw gcnew ArgumentNullException("Key");
if (!IV || IV->Length <= 0)
throw gcnew ArgumentNullException("IV");
// Declare the streams used
// to encrypt to an in memory
// array of bytes.
MemoryStream^ msEncrypt;
CryptoStream^ csEncrypt;
StreamWriter^ swEncrypt;
// Declare the RijndaelManaged object
// used to encrypt the data.
RijndaelManaged^ aesAlg;
try
{
// Create a RijndaelManaged object
// with the specified key and IV.
aesAlg = gcnew RijndaelManaged();
aesAlg->Padding = PaddingMode::PKCS7;
aesAlg->Key = Key;
aesAlg->IV = IV;
// Create an encryptor to perform the stream transform.
ICryptoTransform^ encryptor = aesAlg->CreateEncryptor(aesAlg->Key, aesAlg->IV);
// Create the streams used for encryption.
msEncrypt = gcnew MemoryStream();
csEncrypt = gcnew CryptoStream(msEncrypt, encryptor, CryptoStreamMode::Write);
swEncrypt = gcnew StreamWriter(csEncrypt);
//Write all data to the stream.
swEncrypt->Write(plainText);
swEncrypt->Flush();
csEncrypt->FlushFinalBlock();
msEncrypt->Flush();
}
finally
{
// Clean things up.
// Close the streams.
if(swEncrypt)
swEncrypt->Close();
if (csEncrypt)
csEncrypt->Close();
// Clear the RijndaelManaged object.
if (aesAlg)
aesAlg->Clear();
}
// Return the encrypted bytes from the memory stream.
return msEncrypt->ToArray();
}
static String^ decryptStringFromBytes_AES(array<Byte>^ cipherText, array<Byte>^ Key, array<Byte>^ IV)
{
// Check arguments.
if (!cipherText || cipherText->Length <= 0)
throw gcnew ArgumentNullException("cipherText");
if (!Key || Key->Length <= 0)
throw gcnew ArgumentNullException("Key");
if (!IV || IV->Length <= 0)
throw gcnew ArgumentNullException("IV");
// TDeclare the streams used
// to decrypt to an in memory
// array of bytes.
MemoryStream^ msDecrypt;
CryptoStream^ csDecrypt;
StreamReader^ srDecrypt;
// Declare the RijndaelManaged object
// used to decrypt the data.
RijndaelManaged^ aesAlg;
// Declare the string used to hold
// the decrypted text.
String^ plaintext;
try
{
// Create a RijndaelManaged object
// with the specified key and IV.
aesAlg = gcnew RijndaelManaged();
aesAlg->Padding = PaddingMode::PKCS7;
aesAlg->Key = Key;
aesAlg->IV = IV;
// Create a decryptor to perform the stream transform.
ICryptoTransform^ decryptor = aesAlg->CreateDecryptor(aesAlg->Key, aesAlg->IV);
// Create the streams used for decryption.
msDecrypt = gcnew MemoryStream(cipherText);
csDecrypt = gcnew CryptoStream(msDecrypt, decryptor, CryptoStreamMode::Read);
srDecrypt = gcnew StreamReader(csDecrypt);
// Read the decrypted bytes from the decrypting stream
// and place them in a string.
plaintext = srDecrypt->ReadToEnd();
}
finally
{
// Clean things up.
// Close the streams.
if (srDecrypt)
srDecrypt->Close();
if (csDecrypt)
csDecrypt->Close();
if (msDecrypt)
msDecrypt->Close();
// Clear the RijndaelManaged object.
if (aesAlg)
aesAlg->Clear();
}
return plaintext;
}
};
int main()
{
try
{
String^ original = "Here is some data to encrypt!";
// Create a new instance of the RijndaelManaged
// class. This generates a new key and initialization
// vector (IV).
RijndaelManaged^ myRijndael = gcnew RijndaelManaged();
// Encrypt the string to an array of bytes.
array<Byte>^ encrypted = RijndaelMemoryExample::encryptStringToBytes_AES(original, myRijndael->Key, myRijndael->IV);
// Decrypt the bytes to a string.
String^ roundtrip = RijndaelMemoryExample::decryptStringFromBytes_AES(encrypted, myRijndael->Key, myRijndael->IV);
//Display the original data and the decrypted data.
Console::WriteLine("Original: {0}", original);
Console::WriteLine("Round Trip: {0}", roundtrip);
}
catch (Exception^ e)
{
Console::WriteLine("Error: {0}", e->Message);
}
return 0;
}
using System;
using System.IO;
using System.Security.Cryptography;
namespace RijndaelManaged_Example
{
class RijndaelExample
{
public static void Main()
{
try
{
string original = "Here is some data to encrypt!";
// Create a new instance of the RijndaelManaged
// class. This generates a new key and initialization
// vector (IV).
using (RijndaelManaged myRijndael = new RijndaelManaged())
{
myRijndael.GenerateKey();
myRijndael.GenerateIV();
// Encrypt the string to an array of bytes.
byte[] encrypted = EncryptStringToBytes(original, myRijndael.Key, myRijndael.IV);
// Decrypt the bytes to a string.
string roundtrip = DecryptStringFromBytes(encrypted, myRijndael.Key, myRijndael.IV);
//Display the original data and the decrypted data.
Console.WriteLine("Original: {0}", original);
Console.WriteLine("Round Trip: {0}", roundtrip);
}
}
catch (Exception e)
{
Console.WriteLine("Error: {0}", e.Message);
}
}
static byte[] EncryptStringToBytes(string plainText, byte[] Key, byte[] IV)
{
// Check arguments.
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("IV");
byte[] encrypted;
// Create an RijndaelManaged object
// with the specified key and IV.
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
// Create an encryptor to perform the stream transform.
ICryptoTransform encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for encryption.
using (MemoryStream msEncrypt = new MemoryStream())
{
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
//Write all data to the stream.
swEncrypt.Write(plainText);
}
}
encrypted = msEncrypt.ToArray();
}
}
// Return the encrypted bytes from the memory stream.
return encrypted;
}
static string DecryptStringFromBytes(byte[] cipherText, byte[] Key, byte[] IV)
{
// Check arguments.
if (cipherText == null || cipherText.Length <= 0)
throw new ArgumentNullException("cipherText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("IV");
// Declare the string used to hold
// the decrypted text.
string plaintext = null;
// Create an RijndaelManaged object
// with the specified key and IV.
using (RijndaelManaged rijAlg = new RijndaelManaged())
{
rijAlg.Key = Key;
rijAlg.IV = IV;
// Create a decryptor to perform the stream transform.
ICryptoTransform decryptor = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV);
// Create the streams used for decryption.
using (MemoryStream msDecrypt = new MemoryStream(cipherText))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
{
// Read the decrypted bytes from the decrypting stream
// and place them in a string.
plaintext = srDecrypt.ReadToEnd();
}
}
}
}
return plaintext;
}
}
}
Imports System.IO
Imports System.Security.Cryptography
Class RijndaelExample
Public Shared Sub Main()
Try
Dim original As String = "Here is some data to encrypt!"
' Create a new instance of the RijndaelManaged
' class. This generates a new key and initialization
' vector (IV).
Using myRijndael As New RijndaelManaged()
myRijndael.GenerateKey()
myRijndael.GenerateIV()
' Encrypt the string to an array of bytes.
Dim encrypted As Byte() = EncryptStringToBytes(original, myRijndael.Key, myRijndael.IV)
' Decrypt the bytes to a string.
Dim roundtrip As String = DecryptStringFromBytes(encrypted, myRijndael.Key, myRijndael.IV)
'Display the original data and the decrypted data.
Console.WriteLine("Original: {0}", original)
Console.WriteLine("Round Trip: {0}", roundtrip)
End Using
Catch e As Exception
Console.WriteLine("Error: {0}", e.Message)
End Try
End Sub
Shared Function EncryptStringToBytes(ByVal plainText As String, ByVal Key() As Byte, ByVal IV() As Byte) As Byte()
' Check arguments.
If plainText Is Nothing OrElse plainText.Length <= 0 Then
Throw New ArgumentNullException("plainText")
End If
If Key Is Nothing OrElse Key.Length <= 0 Then
Throw New ArgumentNullException("Key")
End If
If IV Is Nothing OrElse IV.Length <= 0 Then
Throw New ArgumentNullException("IV")
End If
Dim encrypted() As Byte
' Create an RijndaelManaged object
' with the specified key and IV.
Using rijAlg As New RijndaelManaged()
rijAlg.Key = Key
rijAlg.IV = IV
' Create an encryptor to perform the stream transform.
Dim encryptor As ICryptoTransform = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV)
' Create the streams used for encryption.
Using msEncrypt As New MemoryStream()
Using csEncrypt As New CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)
Using swEncrypt As New StreamWriter(csEncrypt)
'Write all data to the stream.
swEncrypt.Write(plainText)
End Using
encrypted = msEncrypt.ToArray()
End Using
End Using
End Using
' Return the encrypted bytes from the memory stream.
Return encrypted
End Function 'EncryptStringToBytes
Shared Function DecryptStringFromBytes(ByVal cipherText() As Byte, ByVal Key() As Byte, ByVal IV() As Byte) As String
' Check arguments.
If cipherText Is Nothing OrElse cipherText.Length <= 0 Then
Throw New ArgumentNullException("cipherText")
End If
If Key Is Nothing OrElse Key.Length <= 0 Then
Throw New ArgumentNullException("Key")
End If
If IV Is Nothing OrElse IV.Length <= 0 Then
Throw New ArgumentNullException("IV")
End If
' Declare the string used to hold
' the decrypted text.
Dim plaintext As String = Nothing
' Create an RijndaelManaged object
' with the specified key and IV.
Using rijAlg As New RijndaelManaged
rijAlg.Key = Key
rijAlg.IV = IV
' Create a decryptor to perform the stream transform.
Dim decryptor As ICryptoTransform = rijAlg.CreateDecryptor(rijAlg.Key, rijAlg.IV)
' Create the streams used for decryption.
Using msDecrypt As New MemoryStream(cipherText)
Using csDecrypt As New CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)
Using srDecrypt As New StreamReader(csDecrypt)
' Read the decrypted bytes from the decrypting stream
' and place them in a string.
plaintext = srDecrypt.ReadToEnd()
End Using
End Using
End Using
End Using
Return plaintext
End Function 'DecryptStringFromBytes
End Class
備註
若未指定任何值，請使用此方法產生隨機IV。
