DSASignatureDeformatter Class

Definition

Verifies a Digital Signature Algorithm (DSA) PKCS#1 v1.5 signature.

C#
[System.Runtime.Versioning.UnsupportedOSPlatform("browser")]
public class DSASignatureDeformatter : System.Security.Cryptography.AsymmetricSignatureDeformatter
C#
public class DSASignatureDeformatter : System.Security.Cryptography.AsymmetricSignatureDeformatter
C#
[System.Runtime.InteropServices.ComVisible(true)]
public class DSASignatureDeformatter : System.Security.Cryptography.AsymmetricSignatureDeformatter
Inheritance
DSASignatureDeformatter
Attributes

Examples

C#
using System;
using System.Security.Cryptography;

class DSASample
{
        
    static void Main()
    {
        try
        {
            //Create a new instance of DSA.
            DSA DSA = DSA.Create();

            //The hash to sign.
            byte[] Hash = {59,4,248,102,77,97,142,201,210,12,224,93,25,41,100,197,213,134,130,135};

            //Create an DSASignatureFormatter object and pass it the 
            //DSA instance to transfer the key information.
            DSASignatureFormatter DSAFormatter = new DSASignatureFormatter(DSA);

            //Set the hash algorithm to SHA1.
            DSAFormatter.SetHashAlgorithm("SHA1");

            //Create a signature for HashValue and return it.
            byte[] SignedHash = DSAFormatter.CreateSignature(Hash);

            //Create an DSASignatureDeformatter object and pass it the 
            //DSA instance to transfer the key information.
            DSASignatureDeformatter DSADeformatter = new DSASignatureDeformatter(DSA);

            //Verify the hash and display the results to the console.
            if(DSADeformatter.VerifySignature(Hash, SignedHash))
            {
                Console.WriteLine("The signature was verified.");
            }
            else
            {
                Console.WriteLine("The signature was not verified.");
            }
        }
        catch(CryptographicException e)
        {
            Console.WriteLine(e.Message);
        }
    }
}

Remarks

Important

The creators of the DSA algorithm have withdrawn their support for it. Consider using the RSA class or the ECDsa class instead of the DSA class. Use DSA only for compatibility with legacy applications and data.

Constructors

DSASignatureDeformatter()

Initializes a new instance of the DSASignatureDeformatter class.

DSASignatureDeformatter(AsymmetricAlgorithm)

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

Methods

Equals(Object)

Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode()

Serves as the default hash function.

(Inherited from Object)
GetType()

Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
SetHashAlgorithm(String)

Specifies the hash algorithm for the Digital Signature Algorithm (DSA) signature deformatter.

SetKey(AsymmetricAlgorithm)

Specifies the key to be used for the Digital Signature Algorithm (DSA) signature deformatter.

ToString()

Returns a string that represents the current object.

(Inherited from Object)
VerifySignature(Byte[], Byte[])

Verifies the Digital Signature Algorithm (DSA) signature on the data.

VerifySignature(HashAlgorithm, Byte[])

Verifies the signature from the specified hash value.

(Inherited from AsymmetricSignatureDeformatter)

Applies to

Product Versions
.NET Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9
.NET Framework 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
.NET Standard 2.0, 2.1

See also