I've started work porting ipsec-tools to openssl 1.1, but it's definitely going to be a fair bit of work. It's certainly not going to be complete before the package is removed from buster, but it may be finished in time to get back into buster for the release.
Unfortunately, upstream hasn't shown any interest in this, so for now it's a solo effort. If anybody else is interested in helping, please get in touch with me so we can coordinate something...
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