RSACryptoServiceProvider.Decrypt 方法

定义

命名空间:

System.Security.Cryptography

程序集:

System.Security.Cryptography.dll

对以前加密的数据进行解密。

重载

Decrypt(Byte[], Boolean)	使用 RSA 算法加密数据。
Decrypt(Byte[], RSAEncryptionPadding)	使用指定填充对以前通过 RSA 算法加密的数据进行解密。

Decrypt(Byte[], Boolean)

Source:

RSACryptoServiceProvider.Unix.cs

使用 RSA 算法加密数据。

public:
 cli::array <System::Byte> ^ Decrypt(cli::array <System::Byte> ^ rgb, bool fOAEP);

public byte[] Decrypt (byte[] rgb, bool fOAEP);

override this.Decrypt : byte[] * bool -> byte[]

Public Function Decrypt (rgb As Byte(), fOAEP As Boolean) As Byte()

参数

rgb

Byte[]

要解密的数据。

fOAEP

Boolean

若要使用 OAEP 填充执行直接 RSA 解密，则为 true；若要使用 PKCS#1 v1.5 填充，则为 false。

返回

Byte[]

已解密的数据，它是加密前的原始纯文本。

例外

CryptographicException

无法获取加密服务提供程序 (CSP)。

- 或 -

参数 fOAEP 的值为 true，并且 rgb 参数的长度大于 KeySize。

- 或 -

此密钥与解密数据不匹配。 但是，异常用词可能不准确。 例如，它可能会说 Not enough storage is available to process this command。

ArgumentNullException

rgb 为 null。

示例

下面的代码示例对数据进行加密和解密。

此示例使用 ASCIIEncoding 类;但是， UnicodeEncoding 类在大型数据操作中可能更可取。 加密的值可以保存为 nvarchar Microsoft SQL Server 中的数据类型。

using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Text;
int main()
{
   try
   {
      
      //Create a UnicodeEncoder to convert between byte array and string.
      ASCIIEncoding^ ByteConverter = gcnew ASCIIEncoding;
      String^ dataString = "Data to Encrypt";
      
      //Create byte arrays to hold original, encrypted, and decrypted data.
      array<Byte>^dataToEncrypt = ByteConverter->GetBytes( dataString );
      array<Byte>^encryptedData;
      array<Byte>^decryptedData;
      
      //Create a new instance of the RSACryptoServiceProvider class 
      // and automatically create a new key-pair.
      RSACryptoServiceProvider^ RSAalg = gcnew RSACryptoServiceProvider;
      
      //Display the origianl data to the console.
      Console::WriteLine( "Original Data: {0}", dataString );
      
      //Encrypt the byte array and specify no OAEP padding.  
      //OAEP padding is only available on Microsoft Windows XP or
      //later.  
      encryptedData = RSAalg->Encrypt( dataToEncrypt, false );
      
      //Display the encrypted data to the console. 
      Console::WriteLine( "Encrypted Data: {0}", ByteConverter->GetString( encryptedData ) );
      
      //Pass the data to ENCRYPT and boolean flag specifying 
      //no OAEP padding.
      decryptedData = RSAalg->Decrypt( encryptedData, false );
      
      //Display the decrypted plaintext to the console. 
      Console::WriteLine( "Decrypted plaintext: {0}", ByteConverter->GetString( decryptedData ) );
   }
   catch ( CryptographicException^ e ) 
   {
      
      //Catch this exception in case the encryption did
      //not succeed.
      Console::WriteLine( e->Message );
   }

}

using System;
using System.Security.Cryptography;
using System.Text;

class RSACSPSample
{
    static void Main()
    {
        try
        {
            //Create a UnicodeEncoder to convert between byte array and string.
            ASCIIEncoding ByteConverter = new ASCIIEncoding();

            string dataString = "Data to Encrypt";

            //Create byte arrays to hold original, encrypted, and decrypted data.
            byte[] dataToEncrypt = ByteConverter.GetBytes(dataString);
            byte[] encryptedData;
            byte[] decryptedData;

            //Create a new instance of the RSACryptoServiceProvider class
            // and automatically create a new key-pair.
            RSACryptoServiceProvider RSAalg = new RSACryptoServiceProvider();

            //Display the origianl data to the console.
            Console.WriteLine("Original Data: {0}", dataString);

            //Encrypt the byte array and specify no OAEP padding.
            //OAEP padding is only available on Microsoft Windows XP or
            //later.
            encryptedData = RSAalg.Encrypt(dataToEncrypt, false);

            //Display the encrypted data to the console.
            Console.WriteLine("Encrypted Data: {0}", ByteConverter.GetString(encryptedData));

            //Pass the data to ENCRYPT and boolean flag specifying
            //no OAEP padding.
            decryptedData = RSAalg.Decrypt(encryptedData, false);

            //Display the decrypted plaintext to the console.
            Console.WriteLine("Decrypted plaintext: {0}", ByteConverter.GetString(decryptedData));
        }
        catch(CryptographicException e)
        {
            //Catch this exception in case the encryption did
            //not succeed.
            Console.WriteLine(e.Message);
        }
    }
}

Imports System.Security.Cryptography
Imports System.Text

Module RSACSPExample

    Sub Main()
        Try
            'Create a UnicodeEncoder to convert between byte array and string.
            Dim ByteConverter As New ASCIIEncoding

            Dim dataString As String = "Data to Encrypt"

            'Create byte arrays to hold original, encrypted, and decrypted data.
            Dim dataToEncrypt As Byte() = ByteConverter.GetBytes(dataString)
            Dim encryptedData() As Byte
            Dim decryptedData() As Byte

            'Create a new instance of the RSACryptoServiceProvider class 
            ' and automatically create a new key-pair.
            Dim RSAalg As New RSACryptoServiceProvider

            'Display the origianl data to the console.
            Console.WriteLine("Original Data: {0}", dataString)

            'Encrypt the byte array and specify no OAEP padding.  
            'OAEP padding is only available on Microsoft Windows XP or
            'later.  
            encryptedData = RSAalg.Encrypt(dataToEncrypt, False)

            'Display the encrypted data to the console. 
            Console.WriteLine("Encrypted Data: {0}", ByteConverter.GetString(encryptedData))

            'Pass the data to ENCRYPT and boolean flag specifying 
            'no OAEP padding.
            decryptedData = RSAalg.Decrypt(encryptedData, False)

            'Display the decrypted plaintext to the console. 
            Console.WriteLine("Decrypted plaintext: {0}", ByteConverter.GetString(decryptedData))
        Catch e As CryptographicException
            'Catch this exception in case the encryption did
            'not succeed.
            Console.WriteLine(e.Message)
        End Try
    End Sub 

End Module

注解

使用 Encrypt 来加密数据以使用此方法进行解密。

另请参阅

• Decrypt(Byte[], RSAEncryptionPadding)
• 加密服务

Decrypt(Byte[], RSAEncryptionPadding)

Source:

RSACryptoServiceProvider.Unix.cs

使用指定填充对以前通过 RSA 算法加密的数据进行解密。

public:
 override cli::array <System::Byte> ^ Decrypt(cli::array <System::Byte> ^ data, System::Security::Cryptography::RSAEncryptionPadding ^ padding);

public override byte[] Decrypt (byte[] data, System.Security.Cryptography.RSAEncryptionPadding padding);

override this.Decrypt : byte[] * System.Security.Cryptography.RSAEncryptionPadding -> byte[]

Public Overrides Function Decrypt (data As Byte(), padding As RSAEncryptionPadding) As Byte()

参数

data

Byte[]

要解密的数据。

padding

RSAEncryptionPadding

填充。

返回

Byte[]

已解密的数据。

例外

ArgumentNullException

data 为 null。

或

padding 为 null。

CryptographicException

不支持该填充模式。

注解

padding 必须为 RSAEncryptionPadding.Pkcs1 或 RSAEncryptionPadding.OaepSHA1。