[edk2-devel] [edk2-staging/OpenSSL11_EOL][PATCH 4/4] Readme: 0322 update

[Li, Yi]

Hi Gerd,

Thanks for review,

>> +### Level 2: A bit like workaround, with possibility of upstream to 
>> +openssl 1. Enable the legacy path for X509 pubkey decode and pmeth 
>> +initialization, The purpose is to avoid the use of EN/DECODE and Signature provider, will reduce size about 90KB.
>> +(commit: x509: enable legacy path in pub decode)
>> +https://github.com/liyi77/openssl/commit/8780956da77c949ca42f6c4c3fd6
>> +ef7045646ef0
>> +(commit: evp: enable legacy pmeth)
>> +https://github.com/liyi77/openssl/commit/a2232b35aa308198b61c5734c1bf
>> +e1d0263f074b

>I suspect that is not going to work well long-term, probably openssl will remove the code paths they consider being "legacy" at some point in the future.  Probably not 3.0.x but maybe in 3.1 branch.

Yes, I think in long-term the better way is to remove all legacy code paths, this will also help reduce the size.
The problem is that a large number of legacy APIs are currently used in the EDK2 code.
In the future, it may be a big update to throw all the legacy code.

>> +### Level 3: Totally workaround and hard to upstream to openssl, may 
>> +need scripts to apply them inside EDK2 1. Provider cut.
>> +(commit: CryptoPkg: add own openssl provider) 
>> +https://github.com/liyi77/edk2-staging/commit/c3a5b69d8a3465259cfdca8
>> +f38b0dc7683b3690e

>Allow people implement their own providers looks like an openssl feature to me.  So I don't think this will be a big problem to maintain, I expect they try to keep the interfaces stable to not break apps doing so.

>The only little detail we do differently here is to remove the default providers so LTO can actually remove the unused code.

>> +(commit: x509: remove print function 7KB)
>> +https://github.com/liyi77/openssl/commit/faa5d6781c3af601bcbc11ff199e
>> +2955d7ff4306

>Did you double-check this doesn't break something?

>It did for me, due to some code in openssl depending on a working bio_sprintf() implementation.

I don't do any more test than unit test.
I am sick of this part, but I currently have no other way to reduce the size. I would like to drop those changes first if i find another way.

Regards,
Yi



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