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(Ruby) Sign PDF: Choosing RSASSA-PSS or PKCS1-v1_5 and Hash AlgorithmSee more PDF Signatures ExamplesThis example demonstrates how to choose between RSASSA-PSS vs. PKCS1-v1_5 and the hash algorithm when signing a PDF.
require 'chilkat' # This example requires the Chilkat API to have been previously unlocked. # See Global Unlock Sample for sample code. pdf = Chilkat::CkPdf.new() # Load a PDF to be signed. # The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf success = pdf.LoadFile("qa_data/pdf/hello.pdf") if (success == false) print pdf.lastErrorText() + "\n"; exit end # Options for signing are specified in JSON. json = Chilkat::CkJsonObject.new() # In most cases, the signingCertificateV2 attribute is needed. json.UpdateInt("signingCertificateV2",1) # --------------------------------------------------------------------------------------------------------------------------- # This example is the same as the example at Sign a PDF (Simplest Example Possible) # but with the following lines added to specify the signature scheme and hash algorithm. # The signature schemes PKCS-v1_5 and RSASSA-PSS have differences. # PKCSV1_5 is deterministic. The same message and key will produce an identical signature value each time. # PSS is randomized and will produce a different signature value each time. # To choose the hash algorithm: # (The typical choices are sha1, sha256, sha384, and sha512.) json.UpdateString("hashAlgorithm","sha256") # To choose PKCSV1_5: json.UpdateString("signingAlgorithm","pkcs") # Alternatively, to choose RSASSA-PSS: json.UpdateString("signingAlgorithm","pss") # If not specified, the default is SHA256 with PKCS-v1_5. # The remainder of this example is the same as the example at Sign a PDF (Simplest Example Possible) # --------------------------------------------------------------------------------------------------------------------------- # Put the signature on page 1, top left json.UpdateInt("page",1) json.UpdateString("appearance.y","top") json.UpdateString("appearance.x","left") # Use a font scale of 10.0 json.UpdateString("appearance.fontScale","10.0") # In this example, the appearance of the digital signature will contain three lines: # 1) The signing certificate's common name # 2) The current date/time # 3) Some arbitrary text. # The keyword "cert_cn" is replaced with the Certificate's Subject Common Name. # The keyword "current_dt" is replaced with the current date/time. # Any number of appearance text lines can be added. json.UpdateString("appearance.text[0]","Digitally signed by: cert_cn") json.UpdateString("appearance.text[1]","current_dt") json.UpdateString("appearance.text[2]","The crazy brown fox jumps over the lazy dog.") # Load the signing certificate. (Use your own certificate.) cert = Chilkat::CkCert.new() success = cert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","secret") if (success == false) print cert.lastErrorText() + "\n"; exit end # Tell the pdf object to use the certificate for signing. success = pdf.SetSigningCert(cert) if (success == false) print pdf.lastErrorText() + "\n"; exit end success = pdf.SignPdf(json,"qa_output/hello_signed.pdf") if (success == false) print pdf.lastErrorText() + "\n"; exit end print "The PDF has been successfully cryptographically signed." + "\n"; # The appearance of the signature appears in Adobe Acrobat as shown here: |
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