reallyme-crypto-p521 0.1.2

P-521 ECDSA primitive for ReallyMe Crypto.
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# reallyme-crypto-p521

NIST P-521 ECDSA and ECDH primitive for ReallyMe Crypto.

The public API uses compressed SEC1 public keys, raw 66-byte private scalars,
SHA-512 prehashing, and DER-encoded ECDSA signatures. Secret key material is
returned in zeroizing buffers.

Verification fails closed with a typed error. It does not return a boolean.
ECDH returns the raw shared-secret x-coordinate; protocol code must pass that
through the appropriate KDF before key use.

This Rust primitive is native-lane only. Swift, Kotlin, and TypeScript package
facades expose provider-backed P-521 ECDH independently of this crate's pure
host-provider wasm lane.