Support timestamp signatures comparing

DEVSIX-5982

Author: Eugene Bochilo

sign/src/test/java/com/itextpdf/signatures/sign/LtvSigTest.java

@@ -54,6 +54,7 @@ This file is part of the iText (R) project.
 import com.itextpdf.signatures.LtvVerification;
 import com.itextpdf.signatures.PdfSigner;
 import com.itextpdf.signatures.PrivateKeySignature;
+import com.itextpdf.signatures.testutils.SignaturesCompareTool;
 import com.itextpdf.signatures.testutils.client.TestCrlClient;
 import com.itextpdf.signatures.testutils.client.TestOcspClient;
 import com.itextpdf.signatures.testutils.client.TestTsaClient;
@@ -117,6 +118,9 @@ public void ltvEnabledTest01() throws IOException, GeneralSecurityException {
         signer.timestamp(testTsa, "timestampSig1");
 
         basicCheckLtvDoc("ltvEnabledTsTest01.pdf", "timestampSig1");
+
+        Assert.assertNull(
+                SignaturesCompareTool.compareSignatures(ltvTsFileName, sourceFolder + "cmp_ltvEnabledTsTest01.pdf"));
     }
 
     @Test
@@ -179,6 +183,9 @@ public void secondLtvOriginalHasNoVri01() throws IOException, GeneralSecurityExc
         signer.timestamp(testTsa, "timestampSig2");
 
         basicCheckLtvDoc("secondLtvOriginalHasNoVriTs01.pdf", "timestampSig2");
+
+        Assert.assertNull(SignaturesCompareTool.compareSignatures(
+                ltvTsFileName, sourceFolder + "cmp_secondLtvOriginalHasNoVriTs01.pdf"));
     }
 
     private void basicCheckLtvDoc(String outFileName, String tsSigName) throws IOException, GeneralSecurityException {

sign/src/test/java/com/itextpdf/signatures/sign/PadesSignatureLevelTest.java

@@ -56,6 +56,7 @@ This file is part of the iText (R) project.
 import com.itextpdf.signatures.LtvVerification;
 import com.itextpdf.signatures.PdfSigner;
 import com.itextpdf.signatures.PrivateKeySignature;
+import com.itextpdf.signatures.testutils.SignaturesCompareTool;
 import com.itextpdf.signatures.testutils.client.TestCrlClient;
 import com.itextpdf.signatures.testutils.client.TestOcspClient;
 import com.itextpdf.signatures.testutils.client.TestTsaClient;
@@ -119,6 +120,9 @@ public void padesSignatureLevelTTest01() throws GeneralSecurityException, IOExce
         signer.signDetached(new BouncyCastleDigest(), pks, signRsaChain, null, null, testTsa, 0, PdfSigner.CryptoStandard.CADES);
 
         PadesSigTest.basicCheckSignedDoc(destinationFolder + "padesSignatureLevelTTest01.pdf", "Signature1");
+
+        Assert.assertNull(SignaturesCompareTool.compareSignatures(
+                outFileName, sourceFolder + "cmp_padesSignatureLevelTTest01.pdf"));
     }
 
     @Test

sign/src/test/java/com/itextpdf/signatures/sign/TimestampSigTest.java

@@ -45,10 +45,12 @@ This file is part of the iText (R) project.
 import com.itextpdf.kernel.pdf.PdfReader;
 import com.itextpdf.kernel.pdf.StampingProperties;
 import com.itextpdf.signatures.PdfSigner;
+import com.itextpdf.signatures.testutils.SignaturesCompareTool;
 import com.itextpdf.signatures.testutils.client.TestTsaClient;
 import com.itextpdf.test.ExtendedITextTest;
 import com.itextpdf.test.annotations.type.IntegrationTest;
 import com.itextpdf.test.signutils.Pkcs12FileHelper;
+import org.junit.Assert;
 import org.junit.BeforeClass;
 import org.junit.Test;
 import org.junit.experimental.categories.Category;
@@ -92,6 +94,9 @@ public void timestampTest01() throws IOException, GeneralSecurityException {
         signer.timestamp(testTsa, "timestampSig1");
 
         PadesSigTest.basicCheckSignedDoc(destinationFolder + "timestampTest01.pdf", "timestampSig1");
+
+        Assert.assertNull(
+                SignaturesCompareTool.compareSignatures(outFileName, sourceFolder + "cmp_timestampTest01.pdf"));
     }