2 Replies Latest reply on Dec 4, 2017 8:56 AM by margueritek

    Will there be a Brainpool Curve support for ECC signatures in Adobe Reader?

    vakhtangv7242653

      According to this post: elliptic curves  Adobe Reader only supports specific curves in elliptic cryptography and therefore brainpoolP256r1 is not supported. When I sign the document using brainpool curve I get verification error:

       

      Error during signature verification.

      Error encountered while validating:

      Internal cryptographic library error.

      Error Code: 0x2711

       

      error-image.png

       

      Will these curves be supported in the future releases of Adobe Reader?

       

      [Question moved to the Security & Digital Signatures forum. -Mod]

        • 1. Re: Will there be a Brainpool Curve support for ECC signatures in Adobe Reader?
          Joel_Geraci Adobe Community Professional

          Are you asking about native support? Acrobat and Reader have a signature plugin architecture that allows third party developers to add signature handlers of any kind to the application. There's nothing stopping anyone from adding this to Acrobat and Reader.

          1 person found this helpful
          • 2. Re: Will there be a Brainpool Curve support for ECC signatures in Adobe Reader?
            margueritek Level 2

            This isn't really about adding a signature handler, but about adding new ECC curves to the current handler. Different incarnations of Acrobat/Reader for Windows/Mac can validate curves other than the FIPS standard P256, P384, P521, but those three are the only ones guaranteed to be supported in all versions. This is a limitation of the crypto libraries used in the product. Adding a new signature handler would mean adding the handler plugin to all copies of Acrobat/Reader that might need to validate Brainpool, which is kind of a non-starter for widespread use (e.g. Brazil and Germany want to use Brainpool for government certificates). You need to find an Acrobat Product Manager and convince him/her that Brainpool support would be a good idea. Good luck.