Pieter Wuille ca83ffc2ea tests: add deterministic signing mode to ECDSA ...

This does the following:
* Adds a rfc6979 argument to test_framework/key.py's sign_ecdsa to
  select (deterministic) RFC6979-based nonce generation.
* Add a flag in feature_taproot.py's framework called "deterministic".
* Make the Schnorr signing in feature_taproot.py randomized by default,
  reverting to the old deterministic (aux_rnd=0x0000...00) behavior
  if the deterministic context flag is set.
* Make the ECDSA signing in feature_taproot.py use RFC6979-based nonces
  when the deterministic context flag is set (keeping the old randomized
  behavior otherwise).

2021-11-12 12:04:20 -05:00

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