qr code generator asp net c# FromXmlString Imports a key pair from an XML string. in C#.NET

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FromXmlString Imports a key pair from an XML string.
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Lesson 3: Encrypting and Decrypting Data
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ImportParameters Imports to a public key or key pair the specified RSAParameters
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with the private key and storing the signature in a byte array.
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How to Export and Import Asymmetric Keys and Key Pairs
RSA keys are much more complex than symmetric encryption keys. In fact, RSA keys are called parameters and are represented by an RSAParameters structure. Table 12-3 lists the significant members of this structure and their purpose. The structure includes several parameters that are not listed, but you will not need to directly access these: DP, DQ, InverseQ, P, and Q.
Table 12-3 RSAParameters Structure Members
Parameter D Exponent Modulus
Description The private key. Also known as e, this is the short part of the public key. Also known as n, this is the long part of the public key.
You will almost always need to export your public key because without the public key, nobody can send encrypted messages to you. To export your public key to an instance of the RSAParamaters structure, use the RSACryptoServiceProvider.ExportParameters method, and pass it a Boolean false parameter. The false parameter causes the method to export only the public key. If it were set to true, ExportParameters would export both the public and private key.
IMPORTANT Exporting the private key
Export your private key only if you need to reuse it later. If you do store it, your application must protect the privacy of the private key.
12
User and Data Security
The following code sample demonstrates how to create a new instance of an RSA algorithm and export its automatically generated public key to an RSAParameters object named publicKey:
' VB ' Create an instance of the RSA algorithm object Dim myRSA As RSACryptoServiceProvider = New RSACryptoServiceProvider ' Create a new RSAParameters object with only the public key Dim publicKey As RSAParameters = myRSA.ExportParameters(False) // C# // Create an instance of the RSA algorithm object RSACryptoServiceProvider myRSA = new RSACryptoServiceProvider(); // Create a new RSAParameters object with only the public key RSAParameters publicKey = myRSA.ExportParameters(false);
After you create an RSAParameters object, you can freely access any of the byte array parameters described in Table 12-3. If you need to store or transmit the export key or keys, you should use the RSACryptoServiceProvider.ToXmlString method instead. Like ExportParameters, this method takes a Boolean value that indicates whether the private key should be exported. However, ToXmlString stores the data in an XML format that can be easily stored, transferred, and imported with the FromXmlString method. The following example shows an abbreviated version of an exported RSA key pair created by calling RSACryptoServiceProvider.ToXmlString(true):
<RSAKeyValue> <Modulus>vilaR5C3XtmH5 IGZNTs=</Modulus> <Exponent>AQAB</Exponent> <P>699j5bpT04JlVkjz 66sYYxLG6VQ==</P> <Q>zmNovTJlGUamU1Vk EMtEJqhZgzhTw==</Q> <DP>OWBf5p7qB6JzB7xek tkQGoiMBK+Q==</DP> <DQ>NLbZUrGjduA/99K scf2pOzQTvKw==</DQ> <InverseQ>BYZ3vVwb/N+ HjPcGz7Yg==</InverseQ> <D>Jz81qMuPbP4MdEaF/ hYZ5WmrzeRRE=</D> </RSAKeyValue>
How to Store Key Pairs for Later Reuse
You can also export keys to the CSP by using CryptoAPI key storage. To store your private keys persistently, add the following elements to your code: 1. Create a CspParameters object. 2. Specify the CspParameters.KeyContainerName property.
Lesson 3: Encrypting and Decrypting Data
3. Create a RSACryptoServiceProvider object using the overloaded constructor that accepts a CspParameters object. 4. Set the RSACryptoServiceProvider.PersistKeyInCsp property to true. The .NET Framework handles creating and retrieving keys automatically. The first time you specify a CspParameters object and set the PersistKeyInCsp property to true, the .NET Framework will create the key container and store your key. If you run the same application again, the .NET Framework will detect that a key container with that name already exists and will retrieve the stored private key. For example, if you run this console application repeatedly, it will display the same private key every time:
' VB ' Create a CspParameters object Dim persistantCsp As CspParameters = New CspParameters persistantCsp.KeyContainerName = "AsymmetricExample" ' Create an instance of the RSA algorithm object Dim myRSA As RSACryptoServiceProvider = _ New RSACryptoServiceProvider (persistantCsp) ' Specify that the private key should be stored in the CSP myRSA.PersistKeyInCsp = True ' Create a new RSAParameters object with the private key Dim privateKey As RSAParameters = myRSA.ExportParameters(True) ' Display the private key For Each thisByte As Byte In privateKey.D Console.Write(thisByte.ToString("X2") + " ") Next // C# // Create a CspParameters object CspParameters persistantCsp = new CspParameters(); persistantCsp.KeyContainerName = "AsymmetricExample"; // Create an instance of the RSA algorithm object RSACryptoServiceProvider myRSA = new RSACryptoServiceProvider(persistantCsp); // Specify that the private key should be stored in the CSP myRSA.PersistKeyInCsp = true; // Create a new RSAParameters object with the private key RSAParameters privateKey = myRSA.ExportParameters(true); // Display the private key foreach (byte thisByte in privateKey.D) Console.Write(thisByte.ToString("X2") + " ");
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