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Merge bitcoin#580: Add trivial ecmult_multi algorithm which does not …
…require a scratch space a697d82 Add trivial ecmult_multi to the benchmark tool (Jonas Nick) bade617 Add trivial ecmult_multi algorithm. It is selected when no scratch space is given and just multiplies and adds the points. (Jonas Nick) Pull request description: This commit adds a new ecmult_multi algorithm that is automatically selected when `ecmult_multi_var` is called with scratch space set to `NULL`. This is a trivial algorithm that simply multiplies the points with the corresponding scalars and adds them up. The use case is to allow creating exposed function that uses `ecmult_multi` but without requiring a scratch space argument. For example, in MuSig when computing the combined public key we need to compute a weighted sum of points but we most likely don't care about the performance. And if we do we can still provide a scratch space. Having the option of not providing a scratch space is useful because creating a scratch space is not entirely trivial. One needs to decide on a size and it needs to be destroyed. Tree-SHA512: 2de20feeff00902ca0936ec1f8d81cf7a95d0917f80e76e9eacbd739c8c2e248fbdaeb468a0aeaf715ec251c2c79b5e271ff4d77456218d02332e26e003d796e
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