DSASignatureFormatter.cs

Go to the documentation of this file.

using System.Runtime.Versioning;
 
namespace System.Security.Cryptography;
 
[UnsupportedOSPlatform("browser")]
public class DSASignatureFormatter : AsymmetricSignatureFormatter
{
    private DSA _dsaKey;
 
    public DSASignatureFormatter()
    {
    }
 
    public DSASignatureFormatter(AsymmetricAlgorithm key)
        : this()
    {
        if (key == null)
        {
            throw new ArgumentNullException("key");
        }
        _dsaKey = (DSA)key;
    }
 
    public override void SetKey(AsymmetricAlgorithm key)
    {
        if (key == null)
        {
            throw new ArgumentNullException("key");
        }
        _dsaKey = (DSA)key;
    }
 
    public override void SetHashAlgorithm(string strName)
    {
        if (strName.ToUpperInvariant() != "SHA1")
        {
            throw new CryptographicUnexpectedOperationException(System.SR.Cryptography_InvalidOperation);
        }
    }
 
    public override byte[] CreateSignature(byte[] rgbHash)
    {
        if (rgbHash == null)
        {
            throw new ArgumentNullException("rgbHash");
        }
        if (_dsaKey == null)
        {
            throw new CryptographicUnexpectedOperationException(System.SR.Cryptography_MissingKey);
        }
        return _dsaKey.CreateSignature(rgbHash);
    }
}