* vendor: add github.com/btcsuite/btcd/btcec * crypto: add btcec fallback for sign/recover without cgo This commit adds a non-cgo fallback implementation of secp256k1 operations. * crypto, core/vm: remove wrappers for sha256, ripemd160
thanks to Felix Lange (fjl) for help with design & impl
git-subtree-dir: crypto/ecies git-subtree-mainline: 49a739c8d6 git-subtree-split: 7c0f4a9b18
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