How to use

getOriginalBytes

method

in

com.itextpdf.text.pdf.PdfString

 AcroFields fields = reader.getAcroFields();
PdfDictionary sigDict = fields.getSignatureDictionary(name); 
PdfString contents = sigDict.getAsString(PdfName.CONTENTS);
byte[] contentBytes = contents.getOriginalBytes();

private PdfName getSignatureHashKey(String signatureName) throws NoSuchAlgorithmException, IOException {
  PdfDictionary dic = acroFields.getSignatureDictionary(signatureName);
  PdfString contents = dic.getAsString(PdfName.CONTENTS);
  byte[] bc = contents.getOriginalBytes();
  byte[] bt = null;
  if (PdfName.ETSI_RFC3161.equals(PdfReader.getPdfObject(dic.get(PdfName.SUBFILTER)))) {
    ASN1InputStream din = new ASN1InputStream(new ByteArrayInputStream(bc));
    ASN1Primitive pkcs = din.readObject();
    bc = pkcs.getEncoded();
  }
  bt = hashBytesSha1(bc);
  return new PdfName(Utilities.convertToHex(bt));
}

private PdfName getSignatureHashKey(String signatureName) throws NoSuchAlgorithmException, IOException {
  PdfDictionary dic = acroFields.getSignatureDictionary(signatureName);
  PdfString contents = dic.getAsString(PdfName.CONTENTS);
  byte[] bc = null;
  if(!reader.isEncrypted()) {
    bc = contents.getOriginalBytes();
  }else{
    bc = contents.getBytes();
  }
  byte[] bt = null;
  if (PdfName.ETSI_RFC3161.equals(PdfReader.getPdfObject(dic.get(PdfName.SUBFILTER)))) {
    ASN1InputStream din = new ASN1InputStream(new ByteArrayInputStream(bc));
    ASN1Primitive pkcs = din.readObject();
    bc = pkcs.getEncoded();
  }
  bt = hashBytesSha1(bc);
  return new PdfName(Utilities.convertToHex(bt));
}

  if (cert == null)
    cert = v.getAsArray(PdfName.CERT).getAsString(0);
  pk = new PdfPKCS7(contents.getOriginalBytes(), cert.getBytes(), provider);
  pk = new PdfPKCS7(contents.getOriginalBytes(), sub, provider);
updateByteRange(pk, v);
PdfString str = v.getAsString(PdfName.M);

  cert = v.getAsArray(PdfName.CERT).getAsString(0);
if(!reader.isEncrypted()) {
  pk = new PdfPKCS7(contents.getOriginalBytes(), cert.getBytes(), provider);
}else{
  pk = new PdfPKCS7(contents.getBytes(), cert.getBytes(), provider);
  pk = new PdfPKCS7(contents.getOriginalBytes(), sub, provider);
}else{
  pk = new PdfPKCS7(contents.getBytes(),sub,provider);