Search for encrypted objects Metadata signatures
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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.
This example shows how to search for embedded objects in Metadata signatures.
using(Signaturesignature=newSignature("MetadataEncryptedObject.docx")){// setup key and passphrasestringkey="1234567890";stringsalt="1234567890";// create data encryptionIDataEncryptionencryption=newSymmetricEncryption(SymmetricAlgorithmType.Rijndael,key,salt);MetadataSearchOptionsoptions=newMetadataSearchOptions(){DataEncryption=encryption};// search for signatures in documentList<WordProcessingMetadataSignature>signatures=signature.Search<WordProcessingMetadataSignature>(options);Console.WriteLine("\nSource document contains following signatures.");// get required metadata signaturesWordProcessingMetadataSignaturemdSignature=signatures.FirstOrDefault(p=>p.Name=="Signature");if(mdSignature!=null){DocumentSignatureDatadocumentSignatureData=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 signaturesWordProcessingMetadataSignaturemdAuthor=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 signaturesWordProcessingMetadataSignaturemdDocId=signatures.FirstOrDefault(p=>p.Name=="DocumentId");if(mdDocId!=null){Console.WriteLine("Metadata signature found. Name : {0}. Value: {1}",mdDocId.Name,mdDocId.GetData<string>());}}
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GitHub Examples
You may easily run the code above and see the feature in action in our GitHub examples: