AesManaged 類別
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。
警告
Derived cryptographic types are obsolete. Use the Create method on the base type instead.
提供先進加密標準 (AES) 對稱演算法的 Managed 實作。
public ref class AesManaged sealed : System::Security::Cryptography::Aes[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public sealed class AesManaged : System.Security.Cryptography.Aes[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
[System.Obsolete("Derived cryptographic types are obsolete. Use the Create method on the base type instead.", DiagnosticId="SYSLIB0021", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public sealed class AesManaged : System.Security.Cryptography.Aespublic sealed class AesManaged : System.Security.Cryptography.Aes[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
type AesManaged = class
inherit Aes[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
[<System.Obsolete("Derived cryptographic types are obsolete. Use the Create method on the base type instead.", DiagnosticId="SYSLIB0021", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
type AesManaged = class
inherit Aestype AesManaged = class
inherit AesPublic NotInheritable Class AesManaged
Inherits Aes- 繼承
- 屬性
範例
下列範例示範如何使用 類別來加密和解密範例數據 AesManaged 。
using System;
using System.IO;
using System.Security.Cryptography;
namespace Aes_Example
{
class AesExample
{
public static void Main()
{
string original = "Here is some data to encrypt!";
// Create a new instance of the AesManaged
// class. This generates a new key and initialization
// vector (IV).
using (AesManaged myAes = new AesManaged())
{
// Encrypt the string to an array of bytes.
byte[] encrypted = EncryptStringToBytes_Aes(original, myAes.Key, myAes.IV);
// Decrypt the bytes to a string.
string roundtrip = DecryptStringFromBytes_Aes(encrypted, myAes.Key, myAes.IV);
//Display the original data and the decrypted data.
Console.WriteLine("Original: {0}", original);
Console.WriteLine("Round Trip: {0}", roundtrip);
}
}
static byte[] EncryptStringToBytes_Aes(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 AesManaged object
// with the specified key and IV.
using (AesManaged aesAlg = new AesManaged())
{
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.
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_Aes(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 AesManaged object
// with the specified key and IV.
using (AesManaged aesAlg = new AesManaged())
{
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.
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 AesExample
Public Shared Sub Main()
Dim original As String = "Here is some data to encrypt!"
' Create a new instance of the AesManaged
' class. This generates a new key and initialization
' vector (IV).
Using myAes As New AesManaged()
' Encrypt the string to an array of bytes.
Dim encrypted As Byte() = EncryptStringToBytes_Aes(original, myAes.Key, myAes.IV)
' Decrypt the bytes to a string.
Dim roundtrip As String = DecryptStringFromBytes_Aes(encrypted, myAes.Key, myAes.IV)
'Display the original data and the decrypted data.
Console.WriteLine("Original: {0}", original)
Console.WriteLine("Round Trip: {0}", roundtrip)
End Using
End Sub
Shared Function EncryptStringToBytes_Aes(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 AesManaged object
' with the specified key and IV.
Using aesAlg As New AesManaged()
aesAlg.Key = Key
aesAlg.IV = IV
' Create an encryptor to perform the stream transform.
Dim encryptor As ICryptoTransform = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.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_Aes
Shared Function DecryptStringFromBytes_Aes(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 AesManaged object
' with the specified key and IV.
Using aesAlg As New AesManaged
aesAlg.Key = Key
aesAlg.IV = IV
' Create a decryptor to perform the stream transform.
Dim decryptor As ICryptoTransform = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.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_Aes
End Class
open System
open System.IO
open System.Security.Cryptography
let encryptStringToBytes_Aes (plainText: string, key : byte[], iv : byte[]) : byte[] =
// Check arguments.
if (isNull plainText || plainText.Length <= 0) then nullArg "plainText"
if (isNull key || key.Length <= 0) then nullArg "key"
if (isNull iv || iv.Length <= 0) then nullArg "iv"
// Create an AesManaged object
// with the specified key and IV.
use aesAlg = new AesManaged()
aesAlg.Key <- key
aesAlg.IV <- iv
// Create an encryptor to perform the stream transform.
let encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV)
// Create the streams used for encryption.
use msEncrypt = new MemoryStream()
use csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)
use swEncrypt = new StreamWriter(csEncrypt)
//Write all data to the stream.
swEncrypt.Write(plainText)
swEncrypt.Flush()
// Return the encrypted bytes from the memory stream.
msEncrypt.ToArray()
let decryptStringFromBytes_Aes (cipherText : byte[], key : byte[], iv : byte[]) : string =
// Check arguments.
if (isNull cipherText || cipherText.Length <= 0) then nullArg "cipherText"
if (isNull key || key.Length <= 0) then nullArg "key"
if (isNull iv || iv.Length <= 0) then nullArg "iv"
// Create an AesManaged object
// with the specified key and IV.
use aesAlg = new AesManaged()
aesAlg.Key <- key
aesAlg.IV <- iv
// Create a decryptor to perform the stream transform.
let decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV)
// Create the streams used for decryption.
use msDecrypt = new MemoryStream(cipherText)
use csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)
use srDecrypt = new StreamReader(csDecrypt)
// Read the decrypted bytes from the decrypting stream
// and return the resulting string.
srDecrypt.ReadToEnd()
[<EntryPoint>]
let main argv =
let original = "Here is some data to encrypt!"
// Create a new instance of the AesManaged
// class. This generates a new key and initialization
// vector (IV).
use myAes = new AesManaged()
// Encrypt the string to an array of bytes.
let encrypted = encryptStringToBytes_Aes(original, myAes.Key, myAes.IV)
// Decrypt the bytes to a string.
let roundtrip = decryptStringFromBytes_Aes(encrypted, myAes.Key, myAes.IV)
//Display the original data and the decrypted data.
Console.WriteLine("Original: {0}", original)
Console.WriteLine("Round Trip: {0}", roundtrip)
0
備註
AES 演算法基本上是具有固定區塊大小和反覆項目計數的 Rijndael 對稱演算法。 此類別的運作方式與類別相同， RijndaelManaged 但會將區塊限製為128位，且不允許意見反應模式。
注意
如果已啟用美國聯邦資訊處理標準 (FIPS) 相容演算法的 Windows 安全策略設定，則使用此演算法會 CryptographicException擲回 。
注意
Microsoft 認為，使用 Cipher-Block-Chaining (CBC 加密) 對稱 (加密) 模式加密的數據不再安全，這是在套用可驗證填補的情況下套用屬性) 的預設值 Mode ，而不需要先確保加密文字的完整性，但有非常特定的情況除外。 如需詳細資訊，請參閱 使用填補來計時 CBC 模式對稱解密的弱點。
建構函式
| AesManaged() |
已淘汰.
初始化 AesManaged 類別的新執行個體。 |
欄位
| BlockSizeValue |
已淘汰.
表示密碼編譯作業的區塊大小，以位元為單位。 (繼承來源 SymmetricAlgorithm) |
| FeedbackSizeValue |
已淘汰.
表示密碼編譯作業的回饋大小，以位元為單位。 (繼承來源 SymmetricAlgorithm) |
| IVValue |
已淘汰.
表示對稱演算法的初始化向量 (IV)。 (繼承來源 SymmetricAlgorithm) |
| KeySizeValue |
已淘汰.
表示對稱演算法使用之祕密金鑰的大小，以位元為單位。 (繼承來源 SymmetricAlgorithm) |
| KeyValue |
已淘汰.
表示對稱演算法的祕密金鑰。 (繼承來源 SymmetricAlgorithm) |
| LegalBlockSizesValue |
已淘汰.
指定對稱演算法所支援的區塊大小，以位元為單位。 (繼承來源 SymmetricAlgorithm) |
| LegalKeySizesValue |
已淘汰.
指定對稱演算法所支援的金鑰大小，以位元為單位。 (繼承來源 SymmetricAlgorithm) |
| ModeValue |
已淘汰.
表示對稱演算法中使用的密碼模式。 (繼承來源 SymmetricAlgorithm) |
| PaddingValue |
已淘汰.
表示對稱演算法中使用的填補模式。 (繼承來源 SymmetricAlgorithm) |
屬性
| BlockSize |
已淘汰.
取得或設定密碼編譯作業的區塊大小，以位元為單位。 |
| BlockSize |
已淘汰.
取得或設定密碼編譯作業的區塊大小，以位元為單位。 (繼承來源 SymmetricAlgorithm) |
| FeedbackSize |
已淘汰.
取得或設定用來做為回饋的位元數。 |
| IV |
已淘汰.
取得或設定對稱演算法的初始化向量 (IV)。 |
| Key |
已淘汰.
取得或設定用於對稱演算法的秘密金鑰。 |
| KeySize |
已淘汰.
取得或設定用於對稱演算法之秘密金鑰的大小，以位元為單位。 |
| LegalBlockSizes |
已淘汰.
取得對稱演算法所支援的區塊大小，以位元為單位。 |
| LegalBlockSizes |
已淘汰.
取得對稱演算法所支援的區塊大小，以位元為單位。 (繼承來源 Aes) |
| LegalKeySizes |
已淘汰.
取得對稱演算法所支援的金鑰大小，以位元為單位。 |
| LegalKeySizes |
已淘汰.
取得對稱演算法所支援的金鑰大小，以位元為單位。 (繼承來源 Aes) |
| Mode |
已淘汰.
取得或設定對稱演算法的作業模式。 |
| Padding |
已淘汰.
取得或設定對稱演算法中使用的填補模式。 |
方法
明確介面實作
| IDisposable.Dispose() |
此 API 支援此產品基礎結構，但無法直接用於程式碼之中。
已淘汰.
釋放 SymmetricAlgorithm 所使用的 Unmanaged 資源，並選擇性地釋放 Managed 資源。 (繼承來源 SymmetricAlgorithm) |
