ecdsa: reduce z mod q when performing RFC6979#777
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The RFC specifies this, however we were not performing it. Going forward, it would be nice to be able to refactor these APIs to operate over a `Scalar` which we know is always reduced.
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The RFC specifies this, however we were not performing it.
Going forward, it would be nice to be able to refactor these APIs to operate over a
Scalarwhich we know is always reduced.