Aes 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。
代表所有先進加密標準（AES）實作必須繼承的抽象基底類別。
public ref class Aes abstract : System::Security::Cryptography::SymmetricAlgorithmpublic abstract class Aes : System.Security.Cryptography.SymmetricAlgorithm[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public abstract class Aes : System.Security.Cryptography.SymmetricAlgorithmtype Aes = class
inherit SymmetricAlgorithm[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
type Aes = class
inherit SymmetricAlgorithmPublic MustInherit Class Aes
Inherits SymmetricAlgorithm- 繼承
- 衍生
- 屬性
範例
以下範例示範如何利用類別 Aes 加密與解密樣本資料。
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 Aes
// class. This generates a new key and initialization
// vector (IV).
using (Aes myAes = Aes.Create())
{
// 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 Aes object
// with the specified key and IV.
using (Aes aesAlg = Aes.Create())
{
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 Aes object
// with the specified key and IV.
using (Aes aesAlg = Aes.Create())
{
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 Aes
' class. This generates a new key and initialization
' vector (IV).
Using myAes As Aes = Aes.Create()
' 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 Aes object
' with the specified key and IV.
Using aesAlg As Aes = Aes.Create()
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 Aes object
' with the specified key and IV.
Using aesAlg As Aes = Aes.Create()
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 Aes object
// with the specified key and IV.
use aesAlg = Aes.Create()
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 Aes object
// with the specified key and IV.
use aesAlg = Aes.Create()
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 Aes
// class. This generates a new key and initialization
// vector (IV).
use myAes = Aes.Create()
// 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
建構函式
| 名稱 | Description |
|---|---|
| Aes() |
初始化 Aes 類別的新執行個體。 |
欄位
| 名稱 | Description |
|---|---|
| BlockSizeValue |
代表密碼運算的區塊大小（位元）。 (繼承來源 SymmetricAlgorithm) |
| FeedbackSizeValue |
代表密碼運算的反饋大小（位元）。 (繼承來源 SymmetricAlgorithm) |
| IVValue |
代表對稱演算法的初始化向量（IV）。 (繼承來源 SymmetricAlgorithm) |
| KeySizeValue |
代表對稱演算法所使用的秘密金鑰的大小（以位元為單位）。 (繼承來源 SymmetricAlgorithm) |
| KeyValue |
代表對稱演算法的祕密金鑰。 (繼承來源 SymmetricAlgorithm) |
| LegalBlockSizesValue |
指定對稱演算法所支援的區塊大小（位元）。 (繼承來源 SymmetricAlgorithm) |
| LegalKeySizesValue |
指定對稱演算法所支援的金鑰大小（位元）。 (繼承來源 SymmetricAlgorithm) |
| ModeValue |
代表對稱演算法中使用的密碼模式。 (繼承來源 SymmetricAlgorithm) |
| PaddingValue |
代表對稱演算法中使用的填充模式。 (繼承來源 SymmetricAlgorithm) |
屬性
| 名稱 | Description |
|---|---|
| BlockSize |
取得或設定密碼運算的區塊大小（位元）。 (繼承來源 SymmetricAlgorithm) |
| FeedbackSize |
取得或設定密碼反饋（CFB）與輸出反饋（OFB）密碼模式的反饋大小（位元）。 (繼承來源 SymmetricAlgorithm) |
| IV |
取得或設定對稱演算法的初始化向量（IV）。 (繼承來源 SymmetricAlgorithm) |
| Key |
取得或設定對稱演算法的祕密金鑰。 (繼承來源 SymmetricAlgorithm) |
| KeySize |
取得或設定對稱演算法所使用的秘密金鑰的大小（以位元為單位）。 (繼承來源 SymmetricAlgorithm) |
| LegalBlockSizes |
取得對稱演算法所支援的區塊大小（位元）。 |
| LegalBlockSizes |
取得對稱演算法所支援的區塊大小（位元）。 (繼承來源 SymmetricAlgorithm) |
| LegalKeySizes |
取得對稱演算法所支援的金鑰大小（位元）。 |
| LegalKeySizes |
取得對稱演算法所支援的金鑰大小（位元）。 (繼承來源 SymmetricAlgorithm) |
| Mode |
取得或設定對稱演算法的運作模式。 (繼承來源 SymmetricAlgorithm) |
| Padding |
取得或設定對稱演算法中使用的填充模式。 (繼承來源 SymmetricAlgorithm) |
方法
明確介面實作
| 名稱 | Description |
|---|---|
| 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。 釋放 未管理的資源， SymmetricAlgorithm 並可選擇性地釋放受管理資源。 (繼承來源 SymmetricAlgorithm) |
