[bitcoin-dev] What is OpenSSL still used for?

Wladimir J. van der Laan laanwj at gmail.com
Mon Jan 25 11:58:29 UTC 2016

> > In the release notes for 0.12, it says that we have moved from
> > using OpenSSL to libsecp256k1 for signature validation. So what
> > else is it being used for that we need to keep it as a dependency?
> Openssl was dropped from the consensus layer (ECC) in 0.12, though, it
> still used for...
> 1) ... getting random numbers (randomize the ECC signing context)
> 2) [wallet only] ... AES256 encryption of private keys
> 3) [GUI only] ... SSL/X.509 for BIP70 (payment protocol)
> Openssl dependency for 1) and 2) could be removed. There are some –
> outdated – relevant PRs:
> Entropy: https://github.com/bitcoin/bitcoin/pull/5885
> AES: https://github.com/bitcoin/bitcoin/pull/5949
> I guess for point 3) [BIP70] it makes sense to keep openssl.

Exactly - the plan is that OpenSSL will, in due time, be a dependency only if the
GUI is enabled. Most of the work for that is already done but it has to be made
up to date and carefully tested and integrated.


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