Change Details

This is a partial backport of secp256k1 PR808 : https://github.com/bitcoin-core/secp256k1/pull/808/commits/be317915436909573733afe3972a9abdee9357f7

This is a partial backport of secp256k1 [[https://github.com/bitcoin-core/secp256k1/pull/808 | PR808]] : https://github.com/bitcoin-core/secp256k1/pull/808/commits/be317915436909573733afe3972a9abdee9357f7

This is a partial backport of secp256k1 [[https://github.com/bitcoin-core/secp256k1/pull/808 | PR808]] : https://github.com/bitcoin-core/secp256k1/pull/808/commits/be317915436909573733afe3972a9abdee9357f7