RSACryptoServiceProvider.Decrypt メソッド

ソース:

RSACryptoServiceProvider.Unix.cs

ソース:

RSACryptoServiceProvider.Unix.cs

ソース:

RSACryptoServiceProvider.Unix.cs

ソース:

RSACryptoServiceProvider.Unix.cs

ソース:

RSACryptoServiceProvider.Unix.cs

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

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

[System.Obsolete("RSACryptoServiceProvider.Encrypt and RSACryptoServiceProvider.Decrypt methods that take a Boolean are obsolete. Use the overload that accepts RSAEncryptionPadding instead.", DiagnosticId="SYSLIB0064", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public byte[] Decrypt(byte[] rgb, bool fOAEP);

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

[<System.Obsolete("RSACryptoServiceProvider.Encrypt and RSACryptoServiceProvider.Decrypt methods that take a Boolean are obsolete. Use the overload that accepts RSAEncryptionPadding instead.", DiagnosticId="SYSLIB0064", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
override this.Decrypt : byte[] * bool -> byte[]

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

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

パラメーター

返品

暗号化解除されたデータ。暗号化前の元のプレーン テキストです。

属性

ObsoleteAttribute

例外

例

次のコード例では、データの暗号化と暗号化解除を行います。

この例では、 ASCIIEncoding クラスを使用します。ただし、大規模なデータ操作では、 UnicodeEncoding クラスが適している場合があります。 暗号化された値は、nvarchar データ型としてMicrosoft SQL Serverに保存できます。

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

注釈

Encryptを使用して、このメソッドを使用して復号化するデータを暗号化します。

こちらもご覧ください

• Decrypt(Byte[], RSAEncryptionPadding)
• 暗号化サービス

ソース:

RSACryptoServiceProvider.Unix.cs

ソース:

RSACryptoServiceProvider.Unix.cs

ソース:

RSACryptoServiceProvider.Unix.cs

ソース:

RSACryptoServiceProvider.Unix.cs

ソース:

RSACryptoServiceProvider.Unix.cs

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()

パラメーター

返品

復号化されたデータ。

例外

注釈

padding は、RSAEncryptionPadding.Pkcs1 または RSAEncryptionPadding.OaepSHA1 のいずれかである必要があります。