RSAPKCS1SignatureDeformatter Class
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RSAPKCS1SignatureDeformatter Class

 

Verifies an RSA PKCS #1 version 1.5 signature.

Namespace:   System.Security.Cryptography
Assembly:  mscorlib (in mscorlib.dll)

System.Object
  System.Security.Cryptography.AsymmetricSignatureDeformatter
    System.Security.Cryptography.RSAPKCS1SignatureDeformatter

[ComVisibleAttribute(true)]
public class RSAPKCS1SignatureDeformatter : AsymmetricSignatureDeformatter

NameDescription
System_CAPS_pubmethodRSAPKCS1SignatureDeformatter()

Initializes a new instance of the RSAPKCS1SignatureDeformatter class.

System_CAPS_pubmethodRSAPKCS1SignatureDeformatter(AsymmetricAlgorithm)

Initializes a new instance of the RSAPKCS1SignatureDeformatter class with the specified key.

NameDescription
System_CAPS_pubmethodEquals(Object)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_protmethodFinalize()

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_pubmethodSetHashAlgorithm(String)

Sets the hash algorithm to use for verifying the signature.(Overrides AsymmetricSignatureDeformatter.SetHashAlgorithm(String).)

System_CAPS_pubmethodSetKey(AsymmetricAlgorithm)

Sets the public key to use for verifying the signature.(Overrides AsymmetricSignatureDeformatter.SetKey(AsymmetricAlgorithm).)

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubmethodVerifySignature(Byte[], Byte[])

Verifies the RSA PKCS#1 signature for the specified data.(Overrides AsymmetricSignatureDeformatter.VerifySignature(Byte[], Byte[]).)

System_CAPS_pubmethodVerifySignature(HashAlgorithm, Byte[])

Verifies the signature from the specified hash value.(Inherited from AsymmetricSignatureDeformatter.)

This class is used to verify a digital signature made with the RSA algorithm.

Use RSAPKCS1SignatureFormatter to create digital signatures with the RSA algorithm.

The following example demonstrates how to use the VerifySignature method to verify a signature.

using System;
using System.Security.Cryptography;

class RSASample
{

    static void Main()
    {
        try
        {
            //Create a new instance of RSACryptoServiceProvider.
            using (RSACryptoServiceProvider rsa = new RSACryptoServiceProvider())
            {
                //The hash to sign.
                byte[] hash;
                using (SHA256 sha256 = SHA256.Create())
                {
                    byte[] data = new byte[] { 59, 4, 248, 102, 77, 97, 142, 201, 210, 12, 224, 93, 25, 41, 100, 197, 213, 134, 130, 135 };
                    hash = sha256.ComputeHash(data);
                }

                //Create an RSASignatureFormatter object and pass it the 
                //RSACryptoServiceProvider to transfer the key information.
                RSAPKCS1SignatureFormatter RSAFormatter = new RSAPKCS1SignatureFormatter(rsa);

                //Set the hash algorithm to SHA256.
                RSAFormatter.SetHashAlgorithm("SHA256");

                //Create a signature for HashValue and return it.
                byte[] signedHash = RSAFormatter.CreateSignature(hash);
                //Create an RSAPKCS1SignatureDeformatter object and pass it the  
                //RSACryptoServiceProvider to transfer the key information.
                RSAPKCS1SignatureDeformatter RSADeformatter = new RSAPKCS1SignatureDeformatter(rsa);
                RSADeformatter.SetHashAlgorithm("SHA256");
                //Verify the hash and display the results to the console. 
                if (RSADeformatter.VerifySignature(hash, signedHash))
                {
                    Console.WriteLine("The signature was verified.");
                }
                else
                {
                    Console.WriteLine("The signature was not verified.");
                }
            }

        }
        catch (CryptographicException e)
        {
            Console.WriteLine(e.Message);
        }
    }

}

.NET Framework
Available since 1.1
Windows Phone Silverlight
Available since 7.1

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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