kaidokert / krabiecdsa-rs / 29211744086

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Proof-of-concept ECDSA signing (gated, RFC 6979-validated) (#16)

* Proof-of-concept ECDSA signing (gated, RFC 6979-validated)

First-pass signing behind the off-by-default `signing` feature and a
deliberately-named `dangerous` module. sign_prehashed_with_k does the
core ECDSA math — r = x(k·G) mod n, s = k⁻¹(e + r·d) mod n — reusing
the existing Jacobian point machinery, with a fixed-iteration
double-and-add for k·G and bit-extraction serialization (no new
backend trait bound).

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