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GroupDocs.Signature for Java 19.7
// For complete examples and data files, please go to https://github.com/groupdocs-signature/GroupDocs.Signature-for-Java
public static class DocumentSignature
{
    public String getVersion(){ return Version; }
    public void setVersion(String value){ Version = value; }
    // specify SkipSerialization attribute to skip this field on serialization
    @SkipSerializationAttribute()
    public String Version;
   
    public boolean isProcessed(){ return IsProcessed; }
    public void setProcessed(boolean value){ IsProcessed = value; }
    // specify SkipSerialization attribute to skip this field on serialization
    @SkipSerializationAttribute()
    public boolean IsProcessed;
   
    public String getID(){ return ID; }
    public void setID(String value){ ID = value; }
    @FormatAttribute(propertyName = "SignatureID")
    public String ID;
   
    public String getAuthor(){ return Author; }
    public void setAuthor(String value){ Author = value; }
    @FormatAttribute (propertyName = "Author")
    public String Author;
   
    public java.util.Date getSigned() { return Signed; }
    public void setSigned(java.util.Date value) { Signed = value; }
    @FormatAttribute (propertyName = "SignatureDate",propertyFormat = "yyyy-MM-dd")
    public java.util.Date Signed = new java.util.Date();
   
    public java.math.BigDecimal getDataFactor() { return DataFactor; }
    public void setDataFactor(java.math.BigDecimal value) { DataFactor = value; }
    @FormatAttribute (propertyName = "Factor", propertyFormat = "N2")
    public java.math.BigDecimal DataFactor = new java.math.BigDecimal(0.01);
}
// For complete examples and data files, please go to https://github.com/groupdocs-signature/GroupDocs.Signature-for-Java
// setup key and pasphrase
String key = "1234567890";
String salt = "1234567890";
// create data encryption
IDataEncryption encryption = new SymmetricEncryption(SymmetricAlgorithmType.Rijndael, key, salt);
 
// setup Signature configuration
SignatureConfig signConfig = new SignatureConfig();
signConfig.setStoragePath(BaseTestData.getTestDataPath() +"\\Storage");
signConfig.setOutputPath(BaseTestData.getTestDataPath() +"\\Output");
// instantiate the signature handler
SignatureHandler handler = new SignatureHandler(signConfig);
   
// setup search options
WordsSearchMetadataOptions searchOptions = new WordsSearchMetadataOptions();
   
// search document
SearchResult result = handler.search("SignedMedataDataEncrypted.docx", searchOptions);
// output signatures
java.util.List<WordsMetadataSignature> signatures = result.toList(WordsMetadataSignature.class);
Iterator tmp0 = ( signatures).iterator();
while (tmp0.hasNext()){
    WordsMetadataSignature signature = (WordsMetadataSignature)tmp0.next();
    if (signature != null && signature.getName().equals("DocumentSignature")){
        DocumentSignature docSignature = signature.<DocumentSignature>getData(DocumentSignature.class, encryption);
        if (docSignature != null){
            System.out.print("Found DocumentSignature signature: #"+docSignature.getID()+". Author "+docSignature.getAuthor()+" from "+docSignature.getDataFactor()+". Factor: " +docSignature.getDataFactor() );
        }
    }
}
// For complete examples and data files, please go to https://github.com/groupdocs-signature/GroupDocs.Signature-for-Java
// setup key and passphrase
String key = "1234567890";
String salt = "1234567890";
// create data encryption
IDataEncryption encryption = new SymmetricEncryption(SymmetricAlgorithmType.Rijndael, key, salt);
// setup Signature configuration
SignatureConfig signConfig = new SignatureConfig();
signConfig.setStoragePath(BaseTestData.getTestDataPath() +"\\Storage");
signConfig.setOutputPath(BaseTestData.getTestDataPath() +"\\Output");
// instantiate the signature handler
SignatureHandler<String> handler = new SignatureHandler<String>(signConfig);
// setup signature options
WordsMetadataSignOptions signOptions = new WordsMetadataSignOptions();
// create custom object
DocumentSignature signature = new DocumentSignature();
signature.setID(Guid.newGuid().toString());
signature.setAuthor(System.getenv("USERNAME"));
signature.setSigned(new java.util.Date());
signature.setDataFactor(new java.math.BigDecimal("11.22"));
// add custom object to sigature collection
WordsMetadataSignature mdDocument = signOptions.addSignature("DocumentSignature", signature);
// set encryption
mdDocument.setDataEncryption(encryption);
SaveOptions so = new SaveOptions();
so.setOutputType(OutputType.String);
so.setOutputFileName("SignedMedataDataEncrypted.docx");
// sign document
String signedPath = handler.<String>sign("test.docx", signOptions, so);
System.out.print("Signed file path is: " + signedPath);
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