Use of JCEMapper.setProviderID()

[Julien TAUPIN]

 
Hi all,

I'm sorry to insist but I do not understand why my modifications on
SignatureDSA do not have been accepted. 

For the moment, during RSA signature we get the JCA Signature object from
the provider defined with JCEMapper.setProviderID(providerName);

This is done in the
org.apache.xml.security.algorithms.implementations.SignatureBaseRSA class :

    String provider=JCEMapper.getProviderId();
    try{
      if (provider == null)
      {
        this._signatureAlgorithm = Signature.getInstance(algorithmID);
      }
      else
      {
        this._signatureAlgorithm = Signature.getInstance(algorithmID,
provider);
      }
    }catch (java.security.NoSuchAlgorithmException ex){
      Object[] exArgs = { algorithmID, ex.getLocalizedMessage() };
      throw new XMLSignatureException("algorithms.NoSuchAlgorithm", exArgs);
    }catch (NoSuchProviderException ex){
      Object[] exArgs = { algorithmID, ex.getLocalizedMessage() };
      throw new XMLSignatureException("algorithms.NoSuchAlgorithm", exArgs);
    }


But for the DSA signature the default provider is used in the
org.apache.xml.security.algorithms.implementations.SignatureDSA class :

  String algorithmID = JCEMapper.translateURItoJCEID(SignatureDSA._URI);
  if (log.isDebugEnabled())
    log.debug("Created SignatureDSA using " + algorithmID);

  try {
    this._signatureAlgorithm = Signature.getInstance(algorithmID);
  } catch (java.security.NoSuchAlgorithmException ex) {
     Object[] exArgs = { algorithmID, ex.getLocalizedMessage() };
     throw new XMLSignatureException("algorithms.NoSuchAlgorithm", exArgs);
  }

Why is there a difference between DSA and RSA ? 
How could I specify my provider to perform DSA signature ?