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//! Secp256r1 implementation of the [crate::Verifier] and [crate::Signer] traits.
//!
//! This implementation operates over public keys in compressed form (SEC 1, Version 2.0, Section 2.3.3), generates
//! deterministic signatures as specified in [RFC 6979](https://datatracker.ietf.org/doc/html/rfc6979), and enforces
//! signatures are normalized according to [BIP 62](https://github.com/bitcoin/bips/blob/master/bip-0062.mediawiki#low-s-values-in-signatures).
//!
//! # Example
//! ```rust
//! use commonware_cryptography::{secp256r1, PrivateKey, PublicKey, Signature, Recoverable, Verifier as _, Signer as _};
//! use commonware_math::algebra::Random;
//! use rand::rngs::OsRng;
//!
//! // Generate a new private key
//! let mut signer = secp256r1::standard::PrivateKey::random(&mut OsRng);
//!
//! // Create a message to sign
//! let namespace = b"demo";
//! let msg = b"hello, world!";
//!
//! // Sign the message
//! let signature = signer.sign(namespace, msg);
//!
//! // Verify the signature
//! assert!(signer.public_key().verify(namespace, msg, &signature));
//!
//! // Generate a new private key that supports recoverable signatures
//! let mut signer = secp256r1::recoverable::PrivateKey::random(&mut OsRng);
//!
//! // Sign the message
//! let signature = signer.sign(namespace, msg);
//!
//! // Verify the signature
//! assert_eq!(signature.recover_signer(namespace, msg).unwrap(), signer.public_key());
//! ```