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* crypto: add DecompressPubkey, VerifySignature (#15615)Felix Lange2017-12-061-0/+49
| | | | | | | We need those operations for p2p/enr. Also upgrade github.com/btcsuite/btcd/btcec to the latest version and improve BenchmarkSha3. The benchmark printed extra output that confused tools like benchstat and ignored N.
* crypto/secp256k1: update to github.com/bitcoin-core/secp256k1 @ 9d560f9 (#3544)Felix Lange2017-01-131-0/+87
- Use defined constants instead of hard-coding their integer value. - Allocate secp256k1 structs on the C stack instead of converting []byte - Remove dead code