SignerInformation(
      SignerInfo info,
      ASN1ObjectIdentifier contentType,
      CMSProcessable content,
      IntDigestCalculator digestCalculator,
      SignatureAlgorithmIdentifierFinder sigAlgFinder) {
    this.info = info;
    this.contentType = contentType;
    this.sigAlgFinder = sigAlgFinder;
    this.isCounterSignature = contentType == null;

    SignerIdentifier s = info.getSID();

    if (s.isTagged()) {
      ASN1OctetString octs = ASN1OctetString.getInstance(s.getId());

      sid = new SignerId(octs.getOctets());
    } else {
      IssuerAndSerialNumber iAnds = IssuerAndSerialNumber.getInstance(s.getId());

      sid = new SignerId(iAnds.getName(), iAnds.getSerialNumber().getValue());
    }

    this.digestAlgorithm = info.getDigestAlgorithm();
    this.signedAttributeSet = info.getAuthenticatedAttributes();
    this.unsignedAttributeSet = info.getUnauthenticatedAttributes();
    this.encryptionAlgorithm = info.getDigestEncryptionAlgorithm();
    this.signature = info.getEncryptedDigest().getOctets();

    this.content = content;
    this.digestCalculator = digestCalculator;
  }
Example #2
0
  @Override
  protected void onDocumentSigned(byte[] byteArray) {
    try {
      InputStream inputStream = new ByteArrayInputStream(byteArray);

      PDDocument document = PDDocument.load(inputStream);
      List<PDSignature> signatures = document.getSignatureDictionaries();
      assertEquals(1, signatures.size());

      for (PDSignature pdSignature : signatures) {
        byte[] contents = pdSignature.getContents(byteArray);
        byte[] signedContent = pdSignature.getSignedContent(byteArray);

        logger.info("Byte range : " + Arrays.toString(pdSignature.getByteRange()));

        // IOUtils.write(contents, new FileOutputStream("sig.p7s"));

        ASN1InputStream asn1sInput = new ASN1InputStream(contents);
        ASN1Sequence asn1Seq = (ASN1Sequence) asn1sInput.readObject();

        logger.info("SEQ : " + asn1Seq.toString());

        ASN1ObjectIdentifier oid = ASN1ObjectIdentifier.getInstance(asn1Seq.getObjectAt(0));
        assertEquals(PKCSObjectIdentifiers.signedData, oid);

        SignedData signedData =
            SignedData.getInstance(DERTaggedObject.getInstance(asn1Seq.getObjectAt(1)).getObject());

        ASN1Set digestAlgorithmSet = signedData.getDigestAlgorithms();
        ASN1ObjectIdentifier oidDigestAlgo =
            ASN1ObjectIdentifier.getInstance(
                ASN1Sequence.getInstance(digestAlgorithmSet.getObjectAt(0)).getObjectAt(0));
        DigestAlgorithm digestAlgorithm = DigestAlgorithm.forOID(oidDigestAlgo.getId());
        logger.info("DIGEST ALGO : " + digestAlgorithm);

        ContentInfo encapContentInfo = signedData.getEncapContentInfo();
        ASN1ObjectIdentifier contentTypeOID = encapContentInfo.getContentType();
        logger.info("ENCAPSULATED CONTENT INFO TYPE : " + contentTypeOID);
        assertEquals(PKCSObjectIdentifiers.data, contentTypeOID);

        ASN1Encodable content = encapContentInfo.getContent();
        logger.info("ENCAPSULATED CONTENT INFO CONTENT : " + content);
        assertNull(content);

        List<X509Certificate> certificates = extractCertificates(signedData);

        ASN1Set signerInfosAsn1 = signedData.getSignerInfos();
        logger.info("SIGNER INFO ASN1 : " + signerInfosAsn1.toString());
        SignerInfo signedInfo =
            SignerInfo.getInstance(ASN1Sequence.getInstance(signerInfosAsn1.getObjectAt(0)));

        ASN1Set authenticatedAttributeSet = signedInfo.getAuthenticatedAttributes();
        logger.info("AUTHENTICATED ATTR : " + authenticatedAttributeSet);

        List<ASN1ObjectIdentifier> attributeOids = new ArrayList<ASN1ObjectIdentifier>();
        for (int i = 0; i < authenticatedAttributeSet.size(); i++) {
          Attribute attribute = Attribute.getInstance(authenticatedAttributeSet.getObjectAt(i));
          attributeOids.add(attribute.getAttrType());
        }
        logger.info("List of OID for Auth Attrb : " + attributeOids);

        Attribute attributeDigest = Attribute.getInstance(authenticatedAttributeSet.getObjectAt(1));
        assertEquals(PKCSObjectIdentifiers.pkcs_9_at_messageDigest, attributeDigest.getAttrType());

        ASN1OctetString asn1ObjString =
            ASN1OctetString.getInstance(attributeDigest.getAttrValues().getObjectAt(0));
        String embeddedDigest = Base64.encode(asn1ObjString.getOctets());
        logger.info("MESSAGE DIGEST : " + embeddedDigest);

        byte[] digestSignedContent = DSSUtils.digest(digestAlgorithm, signedContent);
        String computedDigestSignedContentEncodeBase64 = Base64.encode(digestSignedContent);
        logger.info(
            "COMPUTED DIGEST SIGNED CONTENT BASE64 : " + computedDigestSignedContentEncodeBase64);
        assertEquals(embeddedDigest, computedDigestSignedContentEncodeBase64);

        SignerIdentifier sid = signedInfo.getSID();
        logger.info("SIGNER IDENTIFIER : " + sid.getId());

        IssuerAndSerialNumber issuerAndSerialNumber =
            IssuerAndSerialNumber.getInstance(signedInfo.getSID());
        ASN1Integer signerSerialNumber = issuerAndSerialNumber.getSerialNumber();
        logger.info(
            "ISSUER AND SN : " + issuerAndSerialNumber.getName() + " " + signerSerialNumber);

        BigInteger serial = issuerAndSerialNumber.getSerialNumber().getValue();
        X509Certificate signerCertificate = null;
        for (X509Certificate x509Certificate : certificates) {
          if (serial.equals(x509Certificate.getSerialNumber())) {
            signerCertificate = x509Certificate;
          }
        }
        assertNotNull(signerCertificate);

        String algorithm = signerCertificate.getPublicKey().getAlgorithm();
        EncryptionAlgorithm encryptionAlgorithm = EncryptionAlgorithm.forName(algorithm);

        ASN1OctetString encryptedInfoOctedString = signedInfo.getEncryptedDigest();
        String signatureValue = Hex.toHexString(encryptedInfoOctedString.getOctets());

        logger.info("SIGNATURE VALUE : " + signatureValue);

        Cipher cipher = Cipher.getInstance(encryptionAlgorithm.getName());
        cipher.init(Cipher.DECRYPT_MODE, signerCertificate);
        byte[] decrypted = cipher.doFinal(encryptedInfoOctedString.getOctets());

        ASN1InputStream inputDecrypted = new ASN1InputStream(decrypted);

        ASN1Sequence seqDecrypt = (ASN1Sequence) inputDecrypted.readObject();
        logger.info("DECRYPTED : " + seqDecrypt);

        DigestInfo digestInfo = new DigestInfo(seqDecrypt);
        assertEquals(oidDigestAlgo, digestInfo.getAlgorithmId().getAlgorithm());

        String decryptedDigestEncodeBase64 = Base64.encode(digestInfo.getDigest());
        logger.info("DECRYPTED BASE64 : " + decryptedDigestEncodeBase64);

        byte[] encoded = authenticatedAttributeSet.getEncoded();
        byte[] digest = DSSUtils.digest(digestAlgorithm, encoded);
        String computedDigestFromSignatureEncodeBase64 = Base64.encode(digest);
        logger.info(
            "COMPUTED DIGEST FROM SIGNATURE BASE64 : " + computedDigestFromSignatureEncodeBase64);

        assertEquals(decryptedDigestEncodeBase64, computedDigestFromSignatureEncodeBase64);

        IOUtils.closeQuietly(inputDecrypted);
        IOUtils.closeQuietly(asn1sInput);
      }

      IOUtils.closeQuietly(inputStream);
      document.close();
    } catch (Exception e) {
      logger.error(e.getMessage(), e);
      fail(e.getMessage());
    }
  }