Allow sign-to-contract commitments in schnorrsigs#588

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jonasnick wants to merge 6 commits intobitcoin-core:masterfrom

jonasnick:schnorrsig-s2c-only

Commits on Jan 29, 2019

add chacha20 function

apoelstra
authored and
jonasnick
committed
Add schnorrsig module which implements BIP-schnorr [0] compatible signing, verification and batch verification.

apoelstra
authored and
jonasnick
committed
Add secp256k1_context argument to secp256k1_nonce_functions
jonasnick
committed

Commits on Feb 13, 2019

Add ec_commitments which are essentially the pay-to-contract-style tweaks of public keys.
jonasnick
committed
Add and expose sign-to-contract contexts and make nonce_function_bipschnorr do sign-to-contract commitments if an s2c context is provided as nonce data
jonasnick
committed
Add verification of schnorrsig sign-to-contract commitments
jonasnick
committed