pkey: refactor PEM/DER serialization code #328
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This was referenced Feb 16, 2020
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ossl_{rsa,dsa,dh,ec}_new() called from this function are not used
anywhere else. Inline them into pkey_new0() and reduce code
duplication.
Merge the code into the callers so that the wrapping Ruby object is allocated before the raw key object is allocated. This prevents possible memory leak on Ruby object allocation failure, and also reduces the lines of code.
Try PEM_read_bio_Parameters(). Only PEM format is supported at the moment since corresponding d2i_* functions are not provided by OpenSSL.
Export the flow used by OpenSSL::PKey.read and let the subclasses call it before attempting other formats.
Add ossl_pkey_export_traditional() and ossl_pkey_export_spki() helper functions, and use them. This reduces code duplication.
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This is split from #119. This Pull Request mainly aims to reduce code duplication.
PKCS #8 formats support has been already merged by #297. I will create another Pull Request for generic pkey operations, including #generate_{key,params}, #derive, and one-shot #sign/#verify.
This probably should be merged after the v2.2.0 release.