AesCryptoServiceProvider.CreateDecryptor Método
Definição
Cria um objeto descriptografador AES simétrico.Creates a symmetric AES decryptor object.
Sobrecargas
| CreateDecryptor() |
Cria um objeto descriptografador AES simétrico usando a chave atual e o IV (vetor de inicialização).Creates a symmetric AES decryptor object using the current key and initialization vector (IV). |
| CreateDecryptor(Byte[], Byte[]) |
Cria um objeto descriptografador AES simétrico usando a chave especificada e o IV (vetor de inicialização).Creates a symmetric AES decryptor object using the specified key and initialization vector (IV). |
CreateDecryptor()
Cria um objeto descriptografador AES simétrico usando a chave atual e o IV (vetor de inicialização).Creates a symmetric AES decryptor object using the current key and initialization vector (IV).
public:
override System::Security::Cryptography::ICryptoTransform ^ CreateDecryptor();
public override System.Security.Cryptography.ICryptoTransform CreateDecryptor ();
[System.Security.SecurityCritical]
public override System.Security.Cryptography.ICryptoTransform CreateDecryptor ();
override this.CreateDecryptor : unit -> System.Security.Cryptography.ICryptoTransform
[<System.Security.SecurityCritical>]
override this.CreateDecryptor : unit -> System.Security.Cryptography.ICryptoTransform
Public Overrides Function CreateDecryptor () As ICryptoTransform
Retornos
Um objeto descriptografador AES simétrico.A symmetric AES decryptor object.
- Atributos
Exceções
A chave atual é inválida ou está ausente.The current key is invalid or missing.
Aplica-se a
CreateDecryptor(Byte[], Byte[])
Cria um objeto descriptografador AES simétrico usando a chave especificada e o IV (vetor de inicialização).Creates a symmetric AES decryptor object using the specified key and initialization vector (IV).
public:
override System::Security::Cryptography::ICryptoTransform ^ CreateDecryptor(cli::array <System::Byte> ^ rgbKey, cli::array <System::Byte> ^ rgbIV);
public:
override System::Security::Cryptography::ICryptoTransform ^ CreateDecryptor(cli::array <System::Byte> ^ key, cli::array <System::Byte> ^ iv);
public override System.Security.Cryptography.ICryptoTransform CreateDecryptor (byte[] rgbKey, byte[]? rgbIV);
public override System.Security.Cryptography.ICryptoTransform CreateDecryptor (byte[] rgbKey, byte[] rgbIV);
[System.Security.SecurityCritical]
public override System.Security.Cryptography.ICryptoTransform CreateDecryptor (byte[] key, byte[] iv);
public override System.Security.Cryptography.ICryptoTransform CreateDecryptor (byte[] key, byte[] iv);
override this.CreateDecryptor : byte[] * byte[] -> System.Security.Cryptography.ICryptoTransform
[<System.Security.SecurityCritical>]
override this.CreateDecryptor : byte[] * byte[] -> System.Security.Cryptography.ICryptoTransform
Public Overrides Function CreateDecryptor (rgbKey As Byte(), rgbIV As Byte()) As ICryptoTransform
Public Overrides Function CreateDecryptor (key As Byte(), iv As Byte()) As ICryptoTransform
Parâmetros
- rgbKeykey
- Byte[]
A chave secreta a ser usada para o algoritmo simétrico.The secret key to use for the symmetric algorithm.
- rgbIViv
- Byte[]
O vetor de inicialização a ser usado para o algoritmo simétrico.The initialization vector to use for the symmetric algorithm.
Retornos
Um objeto descriptografador AES simétrico.A symmetric AES decryptor object.
- Atributos
Exceções
key ou iv é null.key or iv is null.
key é inválido.key is invalid.
Exemplos
O exemplo a seguir mostra como usar o AesCryptoServiceProvider.CreateDecryptor método para descriptografar uma mensagem criptografada.The following example shows how to use the AesCryptoServiceProvider.CreateDecryptor method to decrypt an encrypted message. Este exemplo de código faz parte de um exemplo maior fornecido para a AesCryptoServiceProvider classe.This code example is part of a larger example provided for the AesCryptoServiceProvider class.
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 AesCryptoServiceProvider object
// with the specified key and IV.
using (AesCryptoServiceProvider aesAlg = new AesCryptoServiceProvider())
{
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;
}
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 AesCryptoServiceProvider object
' with the specified key and IV.
Using aesAlg As New AesCryptoServiceProvider()
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
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 AesCryptoServiceProvider object
// with the specified key and IV.
use aesAlg = new AesCryptoServiceProvider()
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()