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Based on that knowledge you can easily find the appropriate Bounc圜astle classes to analyze the different signature Contents. I would propose studying the specifications I named and the documents referenced from there, mostly RFCs. JSIGNPDF CANNOT SEE VISIBLE SIGNATURE ISOThis essentially is a differently profiled and stricter defined variant of .ĮTSI.RFC3161 defined in ETSI TS 102 778-4 and will become integrated in ISO 32000-2 the signature value Contents contain a TimeStampToken as specified in RFC 3161 time stamp tokens again are a close relative to PKCS#7 signature containers, see above, but they contain a special data sub-structure harboring the document hash, the time of the stamp creation, and information on the issuing time server. No data shall be encapsulated in the PKCS#7 SignedData field.Į defined in ETSI TS 102 778-3 and will become integrated in ISO 32000-2 the signature value Contents contain a DER-encoded SignedData object as specified in CMS CMS signature containers are close relatives to PKCS#7 signature containers, see above. The original signed message digest over the document’s byte range shall be incorporated as the normal PKCS#7 SignedData field. The digest of that SignedData shall be incorporated as the normal PKCS#7 digest.Ī defined in ISO 32000-1 section 12.8.3.3 PKCS#7 Signatures the signature value Contents contain a DER-encoded PKCS#7 binary data object, see above. The SHA1 digest of the document’s byte range shall be encapsulated in the PKCS#7 SignedData field with ContentInfo of type Data. ![]() it may contain certificates for building certificate chains, revocation information for certificate revocation checks, digital time stamps to fix the signing time. ![]() The the collection of signature types burns down to:Ī_sha1 defined in ISO 32000-1 section 12.8.3.2 PKCS#1 Signatures the signature value Contents contain a DER-encoded PKCS#1 binary data object this data object is a fairly naked signature, in case of RSA an encrypted structure containing the padded document hash and the hash algorithm.Ī1 defined in ISO 32000-1 section 12.8.3.3 PKCS#7 Signatures the signature value Contents contain a DER-encoded PKCS#7 binary data object this data object is a big container object which can also contain meta-information, e.g. But let us assume we are in an interoperable situation. JSIGNPDF CANNOT SEE VISIBLE SIGNATURE PDFThe PDF specification specifies a way to also include completely custom signing schemes. Interoperable signature typesĪs the header already says, the following list contains "interoperable signature types" which are more or less strictly defined. Your BC code, on the other hand, can verify merely naked signature byte sequences which are contained in the afore-mentioned signature containers. Your prime problem is that there are multiple types of PDF signatures differing in the format of the signature container and in what actually are the signed bytes. VERSION 2 - Use existing certificates to sign a pdf document require 'openssl' #sigannot = Annotation::Widget::Signature.new VERSION 1 - Generate certificate and key file, and insert them directly into the document require 'openssl' I'm using Adobe Reader X, for the record. ![]() From origami documentation, i found the get_page method, which solved my last problem on this. JSIGNPDF CANNOT SEE VISIBLE SIGNATURE HOW TOTo develop version 2, i also spent some time wondering how to add an annotation - so the signature becomes visible in Adobe reader - without adding a new page to the document. I've opened a new question where you can find some details on a difficulty i had with OpenSSL and DER encoded certificates. Now I just need to figure out how to use this with an external generated certificate (check version 2 below, where i solved it). JSIGNPDF CANNOT SEE VISIBLE SIGNATURE CODEAfter some research, recurring to the OpenSSL documentation and exploring the Origami solution, i built the code below, and managed to insert a locally generated signature/certificate into a pdf document. ![]()
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