TSA hash algorithm used in a signed PDF (jsignpdf-itxt 1.5.5)

TsaHashName.java

import java.util.List;

import net.sf.jsignpdf.utils.PdfUtils;

import org.bouncycastle.tsp.TimeStampToken;

import com.lowagie.text.pdf.AcroFields;
import com.lowagie.text.pdf.PdfPKCS7;
import com.lowagie.text.pdf.PdfReader;

public class TsaHashName {

	public static void main(String[] args) throws Exception {
		PdfReader pr = PdfUtils.getPdfReader("test_signed.pdf", null);
		final AcroFields tmpAcroFields = pr.getAcroFields();
		final List<String> tmpNames = tmpAcroFields.getSignatureNames();
		final int lastSignatureIdx = tmpNames.size() - 1;
		for (int i = lastSignatureIdx; i >= 0; i--) {
			final String name = tmpNames.get(i);
			System.out.println("Signature: " + name);
			final PdfPKCS7 pk = tmpAcroFields.verifySignature(name);
			final TimeStampToken tst = pk.getTimeStampToken();
			if (tst != null) {
				System.out.println("HashAlgorithm: "
						+ PdfPKCS7.getDigestStdName(tst.getTimeStampInfo()
								.getHashAlgorithm().getAlgorithm().getId()));
			}

		}
		pr.close();
	}

}