Change Details

This is a partial backport of secp256k1 PR558 : https://github.com/bitcoin-core/secp256k1/pull/558/commits/7a703fd97db0161bae07ef84513ddde6e0d27353

This is a partial backport of secp256k1 [[https://github.com/bitcoin-core/secp256k1/pull/558 | PR558]] : https://github.com/bitcoin-core/secp256k1/pull/558/commits/7a703fd97db0161bae07ef84513ddde6e0d27353

This is a partial backport of secp256k1 [[https://github.com/bitcoin-core/secp256k1/pull/558 | PR558]] : https://github.com/bitcoin-core/secp256k1/pull/558/commits/7a703fd97db0161bae07ef84513ddde6e0d27353