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Add a PDF_NAME(Foo) macro that evaluates to a pdf_obj for /Foo.
Use the C preprocessor to create the enum values and string table
from one include file instead of using a separate code generator tool.
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The mupdf build included an implimentation of the pkcs7 functions that
are needed for signing documents and verifying signatures, the
implementation being either an openssl-based one, or a stub that returned
errors. This commit removes the pkcs7 functions from the main mupdf
library.
For the sake of verification, there wasn't really a need for the pkcs7
functions to be part of mupdf. It was only the checking function that used
them. The checking function is now provided as a helper, outside of the
main build. The openssl-based pkcs7 functions area also supplied as a
helper. Users wishing to verify signatures can either use the checking
function directly, or use the source on which to base their own.
Document signing requires more integration between mupdf and pkcs7
because part of the process is performed at time of signing and part when
saving the document. Mupdf already had a pdf_pkcs7_signer object that
kept information between the two phases. That object has now been extended
to include the pkcs7 functions involved in signing, and the signing
function now requires such an object, rather than a file path to a
certificate. The openssl-based pkcs7 helper provides a function that, given
the path to a certificate, will return a pdf_pkcs7_signer object.
The intention is that different implementations can be produced for
different platforms, based on cryptographic routines built into the
operationg system. In each case, for the sake of document signing, the
routines would be wrapped up as a pdf_pkcs7_signer object.
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Rather than provide a stream and an explicitly defined set of byte ranges
within that stream, provide a stream that gives access to just the bytes in
the ranges.
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Previously, pdf-pkcs7.c contained mishmash of functions required
for creating and checking signatures, with no separation between
the parts relating to pdf and those relating to pkcs7. This
commit introduces pdf_signature.c which contains the pdf
specifics, leaving pdf-pkcs7.c to be purely pkcs7 functions.
This should more easily allow the use of pkcs7 solutions other
than openssl. The pkcs7 api is declared in pdf-pkcs7.h. It is
entirely free of mupdf specifics, other than using an fz_stream
to specify the bytes to be hashed.
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