#Add date to adobe signature pdf

Admittedly you'd said it in your original question but it didn't catch my eye:Ĭreate a digest of the pdf data using the CryptHashMessage function (SHA256). the same as in the signature's signed messageDigest attribute while in Adobe's signature the time stamp stamps a different one.īANG. In your signature the time stamp stamps the hash of the PDF document, i.e. Here Adobe's choice definitively is the better one but Adobe Reader seems to ignore the deficiency in your signature: After all, it says that the document had not been changed since signing. Your signature has a signatureAlgorithm value of 1.2.840.113549.1.1.1, i.e. Your signature contains a signed signing time attribute.Īs you also have a time stamp embedded, a signing time is not necessary but it is not forbidden, either. Major differences between your signature and Adobe's signature:Īdobe's signature contains a signed revocation information attribute this attribute does not contains any actual revocation information.Īs this attribute is optional, it should not be relevant here. In a nutshell: You are time stamping the wrong data, see the bottom of the answer. How can I check that the data is correct so that adobe can show me that the signature has been timestamped? Then I use the CryptSignMessage function to sign the original data which uses the above structure.The repsonse from the TSA is added to a *CRYPT_SIGN_MESSAGE_PARA* structure as an unauthenticated attribute and the signing time is added as an authenticated attribute.I've set the *TIMESTAMP_DONT_HASH_DATA* flag so that the digest won't be hashed again. Send this digest to the TSA using the CryptRetrieveTimeStamp function.Create a digest of the pdf data using the CryptHashMessage function (SHA256).The steps I follow currently is as follows: But I don't now what.Ĭan someone please help me by describing the steps I need to take so that my signature will be timestamped? Or suggest a tool that can help me find the problem? Obviously, I am doing something wrong in constructing my PKCS#7 message. Currently, all I've achieved is that Adobe reports that 'The signature includes an embedded timestamp but it could not be verified' and when you view the Date/Time properties it says that the 'Timestamp Authority' s not available and the 'Show Certificate' is greyed out. Acrobat/Reader imports just the signature if the photo or scan is fairly clean.I'm trying to embedded timestamp information into a pdf signature so that adobe will report to me that the signature was timestamp. Acrobat/Reader accepts JPG, JPEG, PNG, GIF, TIFF, TIF, and BMP files.

Transfer the photo or scan to your computer.If you are taking a picture of your signature, make sure that the page is lit and that no shadows fall across the signature. Sign in the middle of the paper so you don't photograph or scan the edges. Sign your name in black ink on a clean, blank sheet of white paper.If you want to use an image as your signature: To resize or delete the field, use the options in field toolbar. To move the placed signature or initial, click the field to highlight it and then use the arrow keys. Save Signature: When this check box is selected, and you're signed in to Acrobat Reader or Acrobat, the added signature is saved securely in Adobe Document Cloud for reuse.Ĭlick Apply, and then click at the place in the PDF where you want to place the signature or initial.Image: Browse and select an image of your signature.Draw: Draw your signature in the field.

You can choose from a small selection of signature styles click Change Style to view a different style. Added signatures and initials are saved for future use. You can choose to type, draw, or import a signature image. Below is an example of the Signature panel. If you are signing for the first time, you see the Signature or Initials panel. If you've already added your signature or initials, just select it from the Sign options, and then click at the place in the PDF where you want to add your signature. If you have already added signatures or initials, they are displayed as options to choose from. Open the PDF document or form in Acrobat or Reader, and click Fill & Sign in the right pane.Ĭlick the Sign icon in the Fill & Sign toolbar, and then choose whether you want to add your signature or just initials.

To sign a PDF form, you can type, draw, or insert an image of your handwritten signature or initials. TIP: Need to sign and send a MS Word document? Save it as a PDF and use this process to sign the PDF. If you are looking to create a formal digital identity, see this article.

#Add date to adobe signature how to

This article describes how to 'write' or draw a signature or initials in a PDF, or to choose a saved one from an image file (see the notes at the bottom).