Search for encrypted text in QR-code signatures
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GroupDocs.Signature provides ability to search over secure QR-code signature (QrCodeSignature) 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 secure QR-code text 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 secure QR-code signature text.
Signaturesignature=newSignature("QRCodeEncryptedText.pdf");// setup key and passphrase
Stringkey="1234567890";Stringsalt="1234567890";// create data encryption
IDataEncryptionencryption=newSymmetricEncryption(SymmetricAlgorithmType.Rijndael,key,salt);QrCodeSearchOptionsoptions=newQrCodeSearchOptions();// specify special pages to search on
options.setAllPages(true);options.setPageNumber(1);PagesSetuppagesSetup=newPagesSetup();pagesSetup.setFirstPage(false);pagesSetup.setLastPage(true);pagesSetup.setOddPages(false);pagesSetup.setEvenPages(true);options.setPagesSetup(pagesSetup);// specify types of QR code to verify
options.setEncodeType(QrCodeTypes.QR);options.setDataEncryption(encryption);// search for signatures in document
List<QrCodeSignature>signatures=signature.search(QrCodeSignature.class,options);System.out.print("\nSource document contains following signatures:");for(QrCodeSignatureqrCodeSignature:signatures){System.out.print("QRCode signature found at page "+qrCodeSignature.getPageNumber()+" with type "+qrCodeSignature.getEncodeType().getTypeName()+" and text "+qrCodeSignature.getText());}
More resources
GitHub Examples
You may easily run the code above and see the feature in action in our GitHub examples:
Along with full-featured .NET library we provide simple, but powerful free Apps. You are welcome to eSign PDF, Word, Excel, PowerPoint documents with free to use online GroupDocs Signature App.
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