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A very brief explanation of how to add custom functions to OpenSSL.

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Inspired by Rich Salz's letter to openssl-users@

[edited to remove non-ASCII characters and end of line white space]

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/9267)
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Dmitry Belyavskiy 2019-07-08 20:09:13 +10:00 committed by Pauli
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MODIFYING OPENSSL SOURCE
------------------------
This document describes the way to add custom modifications to OpenSSL sources.
If you are adding new public functions to the custom library build, you need to
either add a prototype in one of the existing OpenSSL header files;
or provide a new header file and edit Configurations/unix-Makefile.tmpl to pick up that file.
After that perform the following steps:
./config -Werror --strict-warnings [your-options]
make update
make
make test
"make update" ensures that your functions declarations are added to util/libcrypto.num or util/libssl.num
If you plan to submit the changes you made to OpenSSL (see CONTRIBUTING), it's worth running:
make doc-nits
after running "make update" to ensure that documentation has correct format.
"make update" also generates files related to OIDs (in the crypto/objects/ folder) and errors.
If a merge error occurs in one of these generated files then the generated files need to be removed
and regenerated using "make update".
To aid in this process the generated files can be committed separately so they can be removed easily.