![]() ![]() If authenticated/signed attributes are present, it checks them, including checking that the digest of the (received) content matches the digest attribute, and checks that the signature verifies as the signature of the signed attributes under the publickey in the cert (and the algorithms specified in the message and SignerInfo) Since the build(cert) overload and not the build(publickey) overload was used, if the (must-be-)authenticated/signed attribute signingTime is present, it checks that signingTime value is within the certificate's validity period The SignerInformationVerifier produced from JcaSimpleSignerInfoVerifierBuilder.build(cert) (which mostly wraps a ContentVerifierProvider) is driven by SignerInformation.verify as follows: I have tested with a pdf that had a trusted signature from a trusted CA 1 (registered as such in keystore) and one from a CA 2 which was not registered as trusted in keystore.Īny explanation/help is much appreciated. It returns true for my signed pdf documents. If (signer.verify(signerInformationVerifier)) SignerInformationVerifier signerInformationVerifier = new JcaSimpleSignerInfoVerifierBuilder().build(cert2) X509Certificate cert2 = (X509Certificate) certFactory.generateCertificate(in) InputStream in = new ByteArrayInputStream(certificateHolder.getEncoded()) ![]() SignerInformation signer = (SignerInformation) it.next() ĬertificateFactory certFactory = CertificateFactory.getInstance("X.509") Iterator it = signers.getSigners().iterator() SignerInformationStore signers = cmsSignedData.getSignerInfos() I tried javadoc, google but could not find an answer. I learned so far that "verify" like coded below does not check if the certificate is trusted. "verify" could also check if the certificate was not expired at time of signing. In that case the objective of "verify" is to see the text did not change/the signature corresponds to the certificate. Both should give the same result if the signature was using the certificate in question. Before comparing it uses the public key from the certificate to "decrypt" the signature. Is it correct to say it compares the hash of the message against the signature (which I understand is also the hash of the message but encrypted with the private key of the sender). Have you tried any of the methods listed here to sign a PDF file in Windows? Share your experience with us in the comments.What exactly does signer.verify(signerInformationVerifier) in the code below check? If you’re using a Mac, check out our in-depth guides on how to edit PDFs on Mac and how to sign a PDF on Mac. Signing a PDF in Windows can be a hassle, but with the instructions in this guide, you should be able to do it easily and save or share the document with others. ![]() Each of these tools has features that allow you to create, edit, convert, sign, and even export your PDF file without effort. Some of the popular tools include SmallPDF, Nitro Pro, or Foxit Reader. If signing a PDF file in Windows using Adobe Reader or DocuSign sounds complicated, there are several online solutions you can use to electronically or digitally sign PDFs. Once every other recipient has signed, each one will receive a copy of the signed document. The owner of the document will receive an email notification that you’ve completed signing the document. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |