RC2.Create 메서드

정의

네임스페이스:

System.Security.Cryptography

어셈블리:

System.Security.Cryptography.dll

RC2 알고리즘을 수행할 암호화 개체의 인스턴스를 만듭니다.

오버로드

Create()	RC2 알고리즘을 수행할 암호화 개체의 인스턴스를 만듭니다.
Create(String)	사용되지 않음. 암호화 개체의 인스턴스를 만들어 지정된 방식으로 RC2 알고리즘을 구현합니다.

Create()

Source:

RC2.cs

RC2 알고리즘을 수행할 암호화 개체의 인스턴스를 만듭니다.

public:
 static System::Security::Cryptography::RC2 ^ Create();

[System.Runtime.Versioning.UnsupportedOSPlatform("android")]
[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public static System.Security.Cryptography.RC2 Create ();

[<System.Runtime.Versioning.UnsupportedOSPlatform("android")>]
[<System.Runtime.Versioning.UnsupportedOSPlatform("browser")>]
static member Create : unit -> System.Security.Cryptography.RC2

Public Shared Function Create () As RC2

반환

RC2

암호화 개체의 인스턴스입니다.

특성

UnsupportedOSPlatformAttribute

예외

TargetInvocationException

FIPS(Federal Information Processing Standards) 모드를 사용하도록 설정한 상태에서 알고리즘이 사용되었지만 이 알고리즘이 FIPS와 호환되지 않는 경우

예제

다음 예제에서는 RC2 개체를 만들고 사용하여 파일의 데이터를 암호화하고 암호 해독하는 방법을 보여 있습니다.

using namespace System;
using namespace System::IO;
using namespace System::Security::Cryptography;
using namespace System::Text;

void EncryptTextToFile(String^ text, String^ path, array<Byte>^ key, array<Byte>^ iv);
String^ DecryptTextFromFile(String^ path, array<Byte>^ key, array<Byte>^ iv);

int main()
{
    try
    {
        array<Byte>^ key;
        array<Byte>^ iv;

        // Create a new RC2 object to generate a random key
        // and initialization vector (IV).
        {
            RC2^ rc2;

            try
            {
                rc2 = RC2::Create();
                key = rc2->Key;
                iv = rc2->IV;
            }
            finally
            {
                delete rc2;
            }
        }

        // Create a string to encrypt.
        String^ original = "Here is some data to encrypt.";
        // The name/path of the file to write.
        String^ filename = "CText.enc";

        // Encrypt the string to a file.
        EncryptTextToFile(original, filename, key, iv);

        // Decrypt the file back to a string.
        String^ decrypted = DecryptTextFromFile(filename, key, iv);

        // Display the decrypted string to the console.
        Console::WriteLine(decrypted);
    }
    catch (Exception^ e)
    {
        Console::WriteLine(e->Message);
    }
}

void EncryptTextToFile(String^ text, String^ path, array<Byte>^ key, array<Byte>^ iv)
{
    FileStream^ fStream = nullptr;
    RC2^ rc2 = nullptr;
    ICryptoTransform^ encryptor = nullptr;
    CryptoStream^ cStream = nullptr;

    try
    {
        // Create or open the specified file.
        fStream = File::Open(path, FileMode::Create);
        // Create a new RC2 object.
        rc2 = RC2::Create();
        // Create an RC2 encryptor from the key and IV
        encryptor = rc2->CreateEncryptor(key, iv);
        // Create a CryptoStream using the FileStream and encryptor
        cStream = gcnew CryptoStream(fStream, encryptor, CryptoStreamMode::Write);

        // Convert the provided string to a byte array.
        array<Byte>^ toEncrypt = Encoding::UTF8->GetBytes(text);

        // Write the byte array to the crypto stream.
        cStream->Write(toEncrypt, 0, toEncrypt->Length);
    }
    catch (CryptographicException^ e)
    {
        Console::WriteLine("A Cryptographic error occurred: {0}", e->Message);
        throw;
    }
    finally
    {
        if (cStream != nullptr)
            delete cStream;

        if (encryptor != nullptr)
            delete encryptor;

        if (rc2 != nullptr)
            delete rc2;

        if (fStream != nullptr)
            delete fStream;
    }
}

String^ DecryptTextFromFile(String^ path, array<Byte>^ key, array<Byte>^ iv)
{
    FileStream^ fStream = nullptr;
    RC2^ rc2 = nullptr;
    ICryptoTransform^ decryptor = nullptr;
    CryptoStream^ cStream = nullptr;
    StreamReader^ reader = nullptr;

    try
    {
        // Open the specified file
        fStream = File::OpenRead(path);
        // Create a new RC2 object.
        rc2 = RC2::Create();
        // Create an RC2 decryptor from the key and IV
        decryptor = rc2->CreateDecryptor(key, iv);
        // Create a CryptoStream using the FileStream and decryptor
        cStream = gcnew CryptoStream(fStream, decryptor, CryptoStreamMode::Read);
        // Create a StreamReader to turn the bytes back into text
        reader = gcnew StreamReader(cStream, Encoding::UTF8);

        // Read back all of the text from the StreamReader, which receives
        // the decrypted bytes from the CryptoStream, which receives the
        // encrypted bytes from the FileStream.
        return reader->ReadToEnd();
    }
    catch (CryptographicException^ e)
    {
        Console::WriteLine("A Cryptographic error occurred: {0}", e->Message);
        throw;
    }
    finally
    {
        if (cStream != nullptr)
            delete cStream;

        if (decryptor != nullptr)
            delete decryptor;

        if (rc2 != nullptr)
            delete rc2;

        if (fStream != nullptr)
            delete fStream;
    }
}

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

class RC2Sample
{
    static void Main()
    {
        try
        {
            byte[] key;
            byte[] iv;

            // Create a new RC2 object to generate a random key
            // and initialization vector (IV).
            using (RC2 rc2 = RC2.Create())
            {
                key = rc2.Key;
                iv = rc2.IV;
            }

            // Create a string to encrypt.
            string original = "Here is some data to encrypt.";
            // The name/path of the file to write.
            string filename = "CText.enc";

            // Encrypt the string to a file.
            EncryptTextToFile(original, filename, key, iv);

            // Decrypt the file back to a string.
            string decrypted = DecryptTextFromFile(filename, key, iv);

            // Display the decrypted string to the console.
            Console.WriteLine(decrypted);
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }

    public static void EncryptTextToFile(string text, string path, byte[] key, byte[] iv)
    {
        try
        {
            // Create or open the specified file.
            using (FileStream fStream = File.Open(path, FileMode.Create))
            // Create a new RC2 object.
            using (RC2 rc2 = RC2.Create())
            // Create an RC2 encryptor from the key and IV
            using (ICryptoTransform encryptor = rc2.CreateEncryptor(key, iv))
            // Create a CryptoStream using the FileStream and encryptor
            using (var cStream = new CryptoStream(fStream, encryptor, CryptoStreamMode.Write))
            {
                // Convert the provided string to a byte array.
                byte[] toEncrypt = Encoding.UTF8.GetBytes(text);

                // Write the byte array to the crypto stream.
                cStream.Write(toEncrypt, 0, toEncrypt.Length);
            }
        }
        catch (CryptographicException e)
        {
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
            throw;
        }
    }

    public static string DecryptTextFromFile(string path, byte[] key, byte[] iv)
    {
        try
        {
            // Open the specified file
            using (FileStream fStream = File.OpenRead(path))
            // Create a new RC2 object.
            using (RC2 rc2 = RC2.Create())
            // Create an RC2 decryptor from the key and IV
            using (ICryptoTransform decryptor = rc2.CreateDecryptor(key, iv))
            // Create a CryptoStream using the FileStream and decryptor
            using (var cStream = new CryptoStream(fStream, decryptor, CryptoStreamMode.Read))
            // Create a StreamReader to turn the bytes back into text
            using (StreamReader reader = new StreamReader(cStream, Encoding.UTF8))
            {
                // Read back all of the text from the StreamReader, which receives
                // the decrypted bytes from the CryptoStream, which receives the
                // encrypted bytes from the FileStream.
                return reader.ReadToEnd();
            }
        }
        catch (CryptographicException e)
        {
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
            throw;
        }
    }
}

Imports System.IO
Imports System.Security.Cryptography
Imports System.Text

Module RC2Sample

    Sub Main()
        Try
            Dim key As Byte()
            Dim iv As Byte()

            ' Create a new RC2 object to generate a key
            ' and initialization vector (IV).
            Using rc2 As RC2 = RC2.Create
                key = rc2.Key
                iv = rc2.IV
            End Using

            ' Create a string to encrypt.
            Dim original As String = "Here is some data to encrypt."
            ' The name/path of the file to write.
            Dim filename As String = "CText.enc"

            ' Encrypt the string to a file.
            EncryptTextToFile(original, filename, key, iv)

            ' Decrypt the file back to a string.
            Dim decrypted As String = DecryptTextFromFile(filename, key, iv)

            ' Display the decrypted string to the console.
            Console.WriteLine(decrypted)
        Catch e As Exception
            Console.WriteLine(e.Message)
        End Try
    End Sub


    Sub EncryptTextToFile(text As String, path As String, key As Byte(), iv As Byte())
        Try
            ' Create or open the specified file.
            ' Create a new RC2 object,
            ' Create an RC2 encryptor from the key and IV,
            ' Create a CryptoStream using the MemoryStream And encryptor
            Using fStream As FileStream = File.Open(path, FileMode.Create),
                rc2 As RC2 = RC2.Create,
                encryptor As ICryptoTransform = rc2.CreateEncryptor(key, iv),
                cStream = New CryptoStream(fStream, encryptor, CryptoStreamMode.Write)

                ' Convert the passed string to a byte array.
                Dim toEncrypt As Byte() = Encoding.UTF8.GetBytes(text)

                ' Write the byte array to the crypto stream.
                cStream.Write(toEncrypt, 0, toEncrypt.Length)
            End Using

        Catch e As CryptographicException
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
            Throw
        End Try
    End Sub


    Function DecryptTextFromFile(path As String, key As Byte(), iv As Byte()) As String
        Try
            ' Open the specified file
            ' Create a new RC2 object.
            ' Create an RC2 decryptor from the key and IV
            ' Create a CryptoStream using the MemoryStream and decryptor
            ' Create a StreamReader to turn the bytes back into text
            Using mStream As FileStream = File.OpenRead(path),
                rc2 As RC2 = RC2.Create,
                decryptor As ICryptoTransform = rc2.CreateDecryptor(key, iv),
                cStream = New CryptoStream(mStream, decryptor, CryptoStreamMode.Read),
                reader = New StreamReader(cStream, Encoding.UTF8)

                ' Read back all of the text from the StreamReader, which receives
                ' the decrypted bytes from the CryptoStream, which receives the
                ' encrypted bytes from the FileStream.
                Return reader.ReadToEnd()
            End Using
        Catch e As CryptographicException
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
            Return Nothing
        End Try
    End Function
End Module

다음 예제에서는 RC2 개체를 만들고 사용하여 메모리의 데이터를 암호화하고 암호 해독하는 방법을 보여 있습니다.

using namespace System;
using namespace System::Security::Cryptography;
using namespace System::Text;
using namespace System::IO;

array<Byte>^ EncryptTextToMemory(String^ text, array<Byte>^ key, array<Byte>^ iv);
String^ DecryptTextFromMemory(array<Byte>^ encrypted, array<Byte>^ key, array<Byte>^ iv);

int main()
{
    try
    {
        array<Byte>^ key;
        array<Byte>^ iv;

        // Create a new RC2 object to generate a random key
        // and initialization vector (IV).
        {
            RC2^ rc2;

            try
            {
                rc2 = RC2::Create();
                key = rc2->Key;
                iv = rc2->IV;
            }
            finally
            {
                delete rc2;
            }
        }

        // Create a string to encrypt.
        String^ original = "Here is some data to encrypt.";

        // Encrypt the string to an in-memory buffer.
        array<Byte>^ encrypted = EncryptTextToMemory(original, key, iv);

        // Decrypt the buffer back to a string.
        String^ decrypted = DecryptTextFromMemory(encrypted, key, iv);

        // Display the decrypted string to the console.
        Console::WriteLine(decrypted);
    }
    catch (Exception^ e)
    {
        Console::WriteLine(e->Message);
    }
}

array<Byte>^ EncryptTextToMemory(String^ text, array<Byte>^ key, array<Byte>^ iv)
{
    MemoryStream^ mStream = nullptr;

    try
    {
        // Create a MemoryStream.
        mStream = gcnew MemoryStream;

        RC2^ rc2 = nullptr;
        ICryptoTransform^ encryptor = nullptr;
        CryptoStream^ cStream = nullptr;

        try
        {
            // Create a new RC2 object.
            rc2 = RC2::Create();
            // Create an RC2 encryptor from the key and IV
            encryptor = rc2->CreateEncryptor(key, iv);
            // Create a CryptoStream using the MemoryStream and encryptor
            cStream = gcnew CryptoStream(mStream, encryptor, CryptoStreamMode::Write);

            // Convert the provided string to a byte array.
            array<Byte>^ toEncrypt = Encoding::UTF8->GetBytes(text);

            // Write the byte array to the crypto stream.
            cStream->Write(toEncrypt, 0, toEncrypt->Length);

            // Disposing the CryptoStream completes the encryption and flushes the stream.
            delete cStream;

            // Get an array of bytes from the MemoryStream that holds the encrypted data.
            array<Byte>^ ret = mStream->ToArray();

            // Return the encrypted buffer.
            return ret;
        }
        finally
        {
            if (cStream != nullptr)
                delete cStream;

            if (encryptor != nullptr)
                delete encryptor;

            if (rc2 != nullptr)
                delete rc2;
        }
    }
    catch (CryptographicException^ e)
    {
        Console::WriteLine("A Cryptographic error occurred: {0}", e->Message);
        throw;
    }
    finally
    {
        if (mStream != nullptr)
            delete mStream;
    }
}

String^ DecryptTextFromMemory(array<Byte>^ encrypted, array<Byte>^ key, array<Byte>^ iv)
{
    MemoryStream^ mStream = nullptr;
    RC2^ rc2 = nullptr;
    ICryptoTransform^ decryptor = nullptr;
    CryptoStream^ cStream = nullptr;

    try
    {
        // Create buffer to hold the decrypted data.
        // RC2-encrypted data will always be slightly bigger than the decrypted data.
        array<Byte>^ decrypted = gcnew array<Byte>(encrypted->Length);
        Int32 offset = 0;

        // Create a new MemoryStream using the provided array of encrypted data.
        mStream = gcnew MemoryStream(encrypted);
        // Create a new RC2 object.
        rc2 = RC2::Create();
        // Create an RC2 decryptor from the key and IV
        decryptor = rc2->CreateDecryptor(key, iv);
        // Create a CryptoStream using the MemoryStream and decryptor
        cStream = gcnew CryptoStream(mStream, decryptor, CryptoStreamMode::Read);

        // Keep reading from the CryptoStream until it finishes (returns 0).
        Int32 read = 1;

        while (read > 0)
        {
            read = cStream->Read(decrypted, offset, decrypted->Length - offset);
            offset += read;
        }

        // Convert the buffer into a string and return it.
        return Encoding::UTF8->GetString(decrypted, 0, offset);
    }
    catch (CryptographicException^ e)
    {
        Console::WriteLine("A Cryptographic error occurred: {0}", e->Message);
        throw;
    }
    finally
    {
        if (cStream != nullptr)
            delete cStream;

        if (decryptor != nullptr)
            delete decryptor;

        if (rc2 != nullptr)
            delete rc2;

        if (mStream != nullptr)
            delete mStream;
    }
}

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

class RC2Sample2
{
    static void Main()
    {
        try
        {
            byte[] key;
            byte[] iv;

            // Create a new RC2 object to generate a random key
            // and initialization vector (IV).
            using (RC2 rc2 = RC2.Create())
            {
                key = rc2.Key;
                iv = rc2.IV;
            }

            // Create a string to encrypt.
            string original = "Here is some data to encrypt.";

            // Encrypt the string to an in-memory buffer.
            byte[] encrypted = EncryptTextToMemory(original, key, iv);

            // Decrypt the buffer back to a string.
            string decrypted = DecryptTextFromMemory(encrypted, key, iv);

            // Display the decrypted string to the console.
            Console.WriteLine(decrypted);
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }

    public static byte[] EncryptTextToMemory(string text, byte[] key, byte[] iv)
    {
        try
        {
            // Create a MemoryStream.
            using (MemoryStream mStream = new MemoryStream())
            {
                // Create a new RC2 object.
                using (RC2 rc2 = RC2.Create())
                // Create an RC2 encryptor from the key and IV
                using (ICryptoTransform encryptor = rc2.CreateEncryptor(key, iv))
                // Create a CryptoStream using the MemoryStream and encryptor
                using (var cStream = new CryptoStream(mStream, encryptor, CryptoStreamMode.Write))
                {
                    // Convert the provided string to a byte array.
                    byte[] toEncrypt = Encoding.UTF8.GetBytes(text);

                    // Write the byte array to the crypto stream and flush it.
                    cStream.Write(toEncrypt, 0, toEncrypt.Length);

                    // Ending the using statement for the CryptoStream completes the encryption.
                }

                // Get an array of bytes from the MemoryStream that holds the encrypted data.
                byte[] ret = mStream.ToArray();

                // Return the encrypted buffer.
                return ret;
            }
        }
        catch (CryptographicException e)
        {
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
            throw;
        }
    }

    public static string DecryptTextFromMemory(byte[] encrypted, byte[] key, byte[] iv)
    {
        try
        {
            // Create a buffer to hold the decrypted data.
            // RC2-encrypted data will always be slightly bigger than the decrypted data.
            byte[] decrypted = new byte[encrypted.Length];
            int offset = 0;

            // Create a new MemoryStream using the provided array of encrypted data.
            using (MemoryStream mStream = new MemoryStream(encrypted))
            {
                // Create a new RC2 object.
                using (RC2 rc2 = RC2.Create())
                // Create an RC2 decryptor from the key and IV
                using (ICryptoTransform decryptor = rc2.CreateDecryptor(key, iv))
                // Create a CryptoStream using the MemoryStream and decryptor
                using (var cStream = new CryptoStream(mStream, decryptor, CryptoStreamMode.Read))
                {
                    // Keep reading from the CryptoStream until it finishes (returns 0).
                    int read = 1;

                    while (read > 0)
                    {
                        read = cStream.Read(decrypted, offset, decrypted.Length - offset);
                        offset += read;
                    }
                }
            }

            // Convert the buffer into a string and return it.
            return Encoding.UTF8.GetString(decrypted, 0, offset);
        }
        catch (CryptographicException e)
        {
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);
            throw;
        }
    }
}

Imports System.Security.Cryptography
Imports System.Text
Imports System.IO

Module RC2Sample

    Sub Main()
        Try
            Dim key As Byte()
            Dim iv As Byte()

            ' Create a new RC2 object to generate a key
            ' and initialization vector (IV).
            Using rc2 As RC2 = RC2.Create
                key = rc2.Key
                iv = rc2.IV
            End Using

            ' Create a string to encrypt.
            Dim original As String = "Here is some data to encrypt."

            ' Encrypt the string to an in-memory buffer.
            Dim encrypted As Byte() = EncryptTextToMemory(original, key, iv)

            ' Decrypt the buffer back to a string.
            Dim decrypted As String = DecryptTextFromMemory(encrypted, key, iv)

            ' Display the decrypted string to the console.
            Console.WriteLine(decrypted)
        Catch e As Exception
            Console.WriteLine(e.Message)
        End Try
    End Sub


    Function EncryptTextToMemory(text As String, key As Byte(), iv As Byte()) As Byte()
        Try
            ' Create a MemoryStream.
            Using mStream As New MemoryStream
                ' Create a new RC2 object,
                ' Create an RC2 encryptor from the key and IV,
                ' Create a CryptoStream using the MemoryStream And encryptor
                Using rc2 As RC2 = RC2.Create,
                    encryptor As ICryptoTransform = rc2.CreateEncryptor(key, iv),
                    cStream = New CryptoStream(mStream, encryptor, CryptoStreamMode.Write)

                    ' Convert the passed string to a byte array.
                    Dim toEncrypt As Byte() = Encoding.UTF8.GetBytes(text)

                    ' Write the byte array to the crypto stream and flush it.
                    cStream.Write(toEncrypt, 0, toEncrypt.Length)

                    ' Ending the using block for the CryptoStream completes the encryption.
                End Using

                ' Get an array of bytes from the MemoryStream that holds the encrypted data.
                Dim ret As Byte() = mStream.ToArray()

                ' Return the encrypted buffer.
                Return ret
            End Using
        Catch e As CryptographicException
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
            Throw
        End Try
    End Function


    Function DecryptTextFromMemory(encrypted As Byte(), key As Byte(), iv As Byte()) As String
        Try
            ' Create a buffer to hold the decrypted data.
            ' RC2-encrypted data will always be slightly bigger than the decrypted data.
            Dim decrypted(encrypted.Length - 1) As Byte
            Dim offset As Integer = 0

            ' Create a new MemoryStream using the provided array of encrypted data.
            ' Create a new RC2 object.
            ' Create an RC2 decryptor from the key and IV
            ' Create a CryptoStream using the MemoryStream and decryptor
            Using mStream As New MemoryStream(encrypted),
                rc2 As RC2 = RC2.Create,
                decryptor As ICryptoTransform = rc2.CreateDecryptor(key, iv),
                cStream = New CryptoStream(mStream, decryptor, CryptoStreamMode.Read)

                ' Keep reading from the CryptoStream until it finishes (returns 0).
                Dim read As Integer = 1

                While (read > 0)
                    read = cStream.Read(decrypted, offset, decrypted.Length - offset)
                    offset += read
                End While
            End Using

            ' Convert the buffer into a string and return it.
            Return New ASCIIEncoding().GetString(decrypted, 0, offset)
        Catch e As CryptographicException
            Console.WriteLine("A Cryptographic error occurred: {0}", e.Message)
            Return Nothing
        End Try
    End Function
End Module

설명

이 메서드를 사용하여 데이터를 암호화하고 암호 해독하는 데 사용할 수 있는 RC2 클래스의 인스턴스를 만듭니다.

추가 정보

• 암호화 서비스

Create(String)

Source:

RC2.cs

주의

Cryptographic factory methods accepting an algorithm name are obsolete. Use the parameterless Create factory method on the algorithm type instead.

암호화 개체의 인스턴스를 만들어 지정된 방식으로 RC2 알고리즘을 구현합니다.

public:
 static System::Security::Cryptography::RC2 ^ Create(System::String ^ AlgName);

[System.Obsolete("Cryptographic factory methods accepting an algorithm name are obsolete. Use the parameterless Create factory method on the algorithm type instead.", DiagnosticId="SYSLIB0045", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
public static System.Security.Cryptography.RC2? Create (string AlgName);

[<System.Obsolete("Cryptographic factory methods accepting an algorithm name are obsolete. Use the parameterless Create factory method on the algorithm type instead.", DiagnosticId="SYSLIB0045", UrlFormat="https://aka.ms/dotnet-warnings/{0}")>]
static member Create : string -> System.Security.Cryptography.RC2

Public Shared Function Create (AlgName As String) As RC2

매개 변수

AlgName

String

사용하려는 RC2의 특정 구현에 대한 이름입니다.

반환

RC2

암호화 개체의 인스턴스입니다.

특성

ObsoleteAttribute

예외

TargetInvocationException

algName 매개 변수에서 설명하는 알고리즘이 FIPS(Federal Information Processing Standards) 모드를 설정하여 사용되었지만 FIPS 호환이 아닌 경우

추가 정보

• 암호화 서비스