nx_ecdsa_sig_der_384.nx

nx_ecdsa_sig_der_384.nx -- parse DER-encoded ECDSA-P384 signatures into (r, s) U384 scalars. Parallel to nx_ecdsa_sig_der.nx (which targets U256 / P-256). The DER shape is identical -- SEQUENCE { INTEGER r, INTEGER s } -- but the magnitude width changes from 32 to 48 bytes: - 48 bytes when leading bit is 0 - 49 bytes when leading bit is 1 (DER 0x00 sign prefix) - fewer than 48 bytes when high bytes happen to be zero Public API: nx_ecdsa_sig_parse_der_384(buf, len, out_r, out_s) -> verdict Sealed verdict enum mirrors nx_ecdsa_sig_der's; reuses the same constants (NX_ECDSA_DER_*). Per Cardinals 9 (single-responsibility -- parse, not verify), 12 (defensive at boundaries -- bounded reads), 23 (preamble explains why 49-byte INTEGER is normal for P-384). license_tier: INDEPENDENT_REDERIVE genealogy_id: international-research-sources/ietf/rfc_3279 + rfc_5480 + itu_t/x_690 lineage_id: nishi_ecdsa_sig_der_384_q10