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I've mentioned this before on HN [1]. I strongly hope 1.15 will finally address the math/big.addMulVVW issues that really slow down RSA computations, directly affecting PGP and TLS.

[1] https://news.ycombinator.com/item?id=21968913

Edit: I screwed up some initialisms.

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Is RSA mandatory for your use case? Both PGP and TLS support ECC, right?

You are correct that the specs support ECC. Go's implementation is not complete (see https://godoc.org/golang.org/x/crypto/openpgp/packet). More importantly you can't guarantee clients will be able to use ECC. See this issue (from my initial link): https://github.com/golang/go/issues/20058

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