Search for encrypted objects Metadata signatures Leave feedback
GroupDocs.Signature provides ability to search for embedded objects in Metadata signatures with standard or custom encryption. Standard encryption is implemented over class SymmetricEncryption class. Creation of this object expects 3 arguments like encryption algorithm enumeration SymmetricAlgorithmType with one of following values (DES, TripleDES, RC2, Rijndael), string value key and string value salt.
Here are the steps to search for embedded Metadata signature with standard encryption with GroupDocs.Signature:
- Create new instance of Signature class and pass source document path or stream as a constructor parameter.
- Compose object of SymmetricEncryption class with same parameters as secured QR-code was signed with.
- Create objects of MetadataSearchOptions class and setup property DataEncryption with object of SymmetricEncryption
- Call Search method of Signature class instance and pass MetadataSearchOptions to it.
- Call method GetData
() of encrypted MetadataSignature object to retrieve object of type Type.
This example shows how to define custom class with serialization and encryption properties and setup Format attributes for properties.
public class DocumentSignatureData
{
[Format("SignID")]
public string ID { get; set; }
[Format("SAuth")]
public string Author { get; set; }
[Format("SDate", "yyyy-MM-dd")]
public DateTime Signed { get; set; }
[Format("SDFact", "N2")]
public decimal DataFactor { get; set; }
[SkipSerialization]
public string Comments { get; set; }
}
This example shows how to search for embedded objects in Metadata signatures.
using (Signature signature = new Signature("MetadataEncryptedObject.docx"))
{
// setup key and passphrase
string key = "1234567890";
string salt = "1234567890";
// create data encryption
IDataEncryption encryption = new SymmetricEncryption(SymmetricAlgorithmType.Rijndael, key, salt);
MetadataSearchOptions options = new MetadataSearchOptions()
{
DataEncryption = encryption
};
// search for signatures in document
List<WordProcessingMetadataSignature> signatures = signature.Search<WordProcessingMetadataSignature>(options);
Console.WriteLine("\nSource document contains following signatures.");
// get required metadata signatures
WordProcessingMetadataSignature mdSignature = signatures.FirstOrDefault(p => p.Name == "Signature");
if (mdSignature != null)
{
DocumentSignatureData documentSignatureData = mdSignature.GetData<DocumentSignatureData>();
if (documentSignatureData != null)
{
Console.WriteLine("Signature has DocumentSignatureData object:\n ID = {0}, Author = {1}, Signed = {2}, DataFactor {3}",
documentSignatureData.ID, documentSignatureData.Author, documentSignatureData.Signed.ToShortDateString(), documentSignatureData.DataFactor);
}
}
// get required metadata signatures
WordProcessingMetadataSignature mdAuthor = signatures.FirstOrDefault(p => p.Name == "Author");
if (mdAuthor != null)
{
Console.WriteLine("Metadata signature found. Name : {0}. Value: {1}", mdAuthor.Name, mdAuthor.GetData<string>());
}
// get required metadata signatures
WordProcessingMetadataSignature mdDocId = signatures.FirstOrDefault(p => p.Name == "DocumentId");
if (mdDocId != null)
{
Console.WriteLine("Metadata signature found. Name : {0}. Value: {1}", mdDocId.Name, mdDocId.GetData<string>());
}
}
You may easily run the code above and see the feature in action in our GitHub examples:
- GroupDocs.Signature for .NET examples, plugins, and showcase
- GroupDocs.Signature for Java examples, plugins, and showcase
- Document Signature for .NET MVC UI Example
- Document Signature for .NET App WebForms UI Example
- Document Signature for Java App Dropwizard UI Example
- Document Signature for Java Spring UI Example
Along with the full-featured .NET library, we provide simple but powerful free online apps.
To sign PDF, Word, Excel, PowerPoint, and other documents you can use the online apps from the GroupDocs.Signature App Product Family.
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