RSACryptoServiceProvider.Encrypt RSACryptoServiceProvider.Encrypt RSACryptoServiceProvider.Encrypt RSACryptoServiceProvider.Encrypt Method

Definition

Encrypts data with the RSA algorithm.

Overloads

Encrypt(Byte[], Boolean) Encrypt(Byte[], Boolean) Encrypt(Byte[], Boolean) Encrypt(Byte[], Boolean)

Encrypts data with the RSA algorithm.

Encrypt(Byte[], RSAEncryptionPadding) Encrypt(Byte[], RSAEncryptionPadding) Encrypt(Byte[], RSAEncryptionPadding) Encrypt(Byte[], RSAEncryptionPadding)

Encrypts data with the RSA algorithm using the specified padding.

Encrypt(Byte[], Boolean) Encrypt(Byte[], Boolean) Encrypt(Byte[], Boolean) Encrypt(Byte[], Boolean)

Encrypts data with the RSA algorithm.

public:
 cli::array <System::Byte> ^ Encrypt(cli::array <System::Byte> ^ rgb, bool fOAEP);
public byte[] Encrypt (byte[] rgb, bool fOAEP);
override this.Encrypt : byte[] * bool -> byte[]
Public Function Encrypt (rgb As Byte(), fOAEP As Boolean) As Byte()
Parameters
rgb
Byte[]

The data to be encrypted.

fOAEP
Boolean Boolean Boolean Boolean

true to perform direct RSA encryption using OAEP padding (only available on a computer running Windows XP or later); otherwise, false to use PKCS#1 v1.5 padding.

Returns
Byte[]

The encrypted data.

Exceptions

The cryptographic service provider (CSP) cannot be acquired.

-or-

The length of the rgb parameter is greater than the maximum allowed length.

-or-

The fOAEP parameter is true and OAEP padding is not supported.

Examples

The following code example initializes an RSACryptoServiceProvider object to the value of a public key (sent by another party), generates a session key using the RijndaelManaged algorithm, and then encrypts the session key using the RSACryptoServiceProvider object. Using this scheme, the session key could be sent back to the owner of the private RSA key and the two parties could use the session key to exchange encrypted data.

#using <System.dll>

using namespace System;
using namespace System::Security::Cryptography;
int main()
{
   try
   {
      
      //initialze the Byte arrays to the public key information.
      array<Byte>^PublicKey = {214,46,220,83,160,73,40,39,201,155,19,202,3,11,191,178,56,74,90,36,248,103,18,144,170,163,145,87,54,61,34,220,222,207,137,149,173,14,92,120,206,222,158,28,40,24,30,16,175,108,128,35,230,118,40,121,113,125,216,130,11,24,90,48,194,240,105,44,76,34,57,249,228,125,80,38,9,136,29,117,207,139,168,181,85,137,126,10,126,242,120,247,121,8,100,12,201,171,38,226,193,180,190,117,177,87,143,242,213,11,44,180,113,93,106,99,179,68,175,211,164,116,64,148,226,254,172,147};
      array<Byte>^Exponent = {1,0,1};
      
      //Values to store encrypted symmetric keys.
      array<Byte>^EncryptedSymmetricKey;
      array<Byte>^EncryptedSymmetricIV;
      
      //Create a new instance of RSACryptoServiceProvider.
      RSACryptoServiceProvider^ RSA = gcnew RSACryptoServiceProvider;
      
      //Create a new instance of RSAParameters.
      RSAParameters RSAKeyInfo;
      
      //Set RSAKeyInfo to the public key values. 
      RSAKeyInfo.Modulus = PublicKey;
      RSAKeyInfo.Exponent = Exponent;
      
      //Import key parameters into RSA.
      RSA->ImportParameters( RSAKeyInfo );
      
      //Create a new instance of the RijndaelManaged class.
      RijndaelManaged^ RM = gcnew RijndaelManaged;
      
      //Encrypt the symmetric key and IV.
      EncryptedSymmetricKey = RSA->Encrypt( RM->Key, false );
      EncryptedSymmetricIV = RSA->Encrypt( RM->IV, false );
      Console::WriteLine( "RijndaelManaged Key and IV have been encrypted with RSACryptoServiceProvider." );
   }
   catch ( CryptographicException^ e ) 
   {
      
      //Catch and display a CryptographicException  
      //to the console.
      Console::WriteLine( e->Message );
   }

}

using System;
using System.Security.Cryptography;

class RSACSPSample
{

	static void Main()
	{
		try
		{		//initialze the byte arrays to the public key information.
			byte[] PublicKey = {214,46,220,83,160,73,40,39,201,155,19,202,3,11,191,178,56,
								   74,90,36,248,103,18,144,170,163,145,87,54,61,34,220,222,
								   207,137,149,173,14,92,120,206,222,158,28,40,24,30,16,175,
								   108,128,35,230,118,40,121,113,125,216,130,11,24,90,48,194,
								   240,105,44,76,34,57,249,228,125,80,38,9,136,29,117,207,139,
								   168,181,85,137,126,10,126,242,120,247,121,8,100,12,201,171,
								   38,226,193,180,190,117,177,87,143,242,213,11,44,180,113,93,
								   106,99,179,68,175,211,164,116,64,148,226,254,172,147};

			byte[] Exponent = {1,0,1};
      
			//Values to store encrypted symmetric keys.
			byte[] EncryptedSymmetricKey;
			byte[] EncryptedSymmetricIV;

			//Create a new instance of RSACryptoServiceProvider.
			RSACryptoServiceProvider RSA = new RSACryptoServiceProvider();

			//Create a new instance of RSAParameters.
			RSAParameters RSAKeyInfo = new RSAParameters();

			//Set RSAKeyInfo to the public key values. 
			RSAKeyInfo.Modulus = PublicKey;
			RSAKeyInfo.Exponent = Exponent;

			//Import key parameters into RSA.
			RSA.ImportParameters(RSAKeyInfo);

			//Create a new instance of the RijndaelManaged class.
			RijndaelManaged RM = new RijndaelManaged();

			//Encrypt the symmetric key and IV.
			EncryptedSymmetricKey = RSA.Encrypt(RM.Key, false);
			EncryptedSymmetricIV = RSA.Encrypt(RM.IV, false);

			Console.WriteLine("RijndaelManaged Key and IV have been encrypted with RSACryptoServiceProvider."); 
		
		}
		//Catch and display a CryptographicException  
		//to the console.
		catch(CryptographicException e)
		{
			Console.WriteLine(e.Message);
		}
	}
}
Imports System
Imports System.Security.Cryptography

Class RSACSPSample

    Shared Sub Main()
        Try
            'initialze the byte arrays to the public key information.
            Dim PublicKey As Byte() = {214, 46, 220, 83, 160, 73, 40, 39, 201, 155, 19, 202, 3, 11, 191, 178, 56, 74, 90, 36, 248, 103, 18, 144, 170, 163, 145, 87, 54, 61, 34, 220, 222, 207, 137, 149, 173, 14, 92, 120, 206, 222, 158, 28, 40, 24, 30, 16, 175, 108, 128, 35, 230, 118, 40, 121, 113, 125, 216, 130, 11, 24, 90, 48, 194, 240, 105, 44, 76, 34, 57, 249, 228, 125, 80, 38, 9, 136, 29, 117, 207, 139, 168, 181, 85, 137, 126, 10, 126, 242, 120, 247, 121, 8, 100, 12, 201, 171, 38, 226, 193, 180, 190, 117, 177, 87, 143, 242, 213, 11, 44, 180, 113, 93, 106, 99, 179, 68, 175, 211, 164, 116, 64, 148, 226, 254, 172, 147}

            Dim Exponent As Byte() = {1, 0, 1}

            'Values to store encrypted symmetric keys.
            Dim EncryptedSymmetricKey() As Byte
            Dim EncryptedSymmetricIV() As Byte

            'Create a new instance of RSACryptoServiceProvider.
            Dim RSA As New RSACryptoServiceProvider()

            'Create a new instance of RSAParameters.
            Dim RSAKeyInfo As New RSAParameters()

            'Set RSAKeyInfo to the public key values. 
            RSAKeyInfo.Modulus = PublicKey
            RSAKeyInfo.Exponent = Exponent

            'Import key parameters into RSA.
            RSA.ImportParameters(RSAKeyInfo)

            'Create a new instance of the RijndaelManaged class.
            Dim RM As New RijndaelManaged()

            'Encrypt the symmetric key and IV.
            EncryptedSymmetricKey = RSA.Encrypt(RM.Key, False)
            EncryptedSymmetricIV = RSA.Encrypt(RM.IV, False)

            Console.WriteLine("RijndaelManaged Key and IV have been encrypted with RSACryptoServiceProvider.")

            'Catch and display a CryptographicException  
            'to the console.
        Catch e As CryptographicException
            Console.WriteLine(e.Message)
        End Try
    End Sub
End Class

Remarks

The following table describes the padding supported by different versions of Microsoft Windows and the maximum length of rgb allowed by the different combinations of operating systems and padding.

Padding Operating System Supported Maximum Length of rgb Parameter
OAEP padding (PKCS#1 v2) Windows XP or later. Modulus size -2 -2*hLen, where hLen is the size of the hash.
Direct Encryption (PKCS#1 v1.5) Microsoft Windows 2000 or later with the high encryption pack installed. Modulus size - 11. (11 bytes is the minimum padding possible.)
Direct Encryption and OAEP padding not supported Microsoft Windows 98, Windows Millennium Edition, or Windows 2000 or later without the high encryption pack installed. The maximum size allowed for a symmetric key.

Use Decrypt to decrypt the results of this method.

See Also

Encrypt(Byte[], RSAEncryptionPadding) Encrypt(Byte[], RSAEncryptionPadding) Encrypt(Byte[], RSAEncryptionPadding) Encrypt(Byte[], RSAEncryptionPadding)

Encrypts data with the RSA algorithm using the specified padding.

public:
 override cli::array <System::Byte> ^ Encrypt(cli::array <System::Byte> ^ data, System::Security::Cryptography::RSAEncryptionPadding ^ padding);
public override byte[] Encrypt (byte[] data, System.Security.Cryptography.RSAEncryptionPadding padding);
override this.Encrypt : byte[] * System.Security.Cryptography.RSAEncryptionPadding -> byte[]
Public Overrides Function Encrypt (data As Byte(), padding As RSAEncryptionPadding) As Byte()
Parameters
data
Byte[]

The data to encrypt.

Returns
Byte[]

The encrypted data.

Exceptions

Remarks

padding must be either RSAEncryptionPadding.Pkcs1 or RSAEncryptionPadding.OaepSHA1.

Applies to