Function hash_g2 

pub fn hash_g2<M: AsRef<[u8]>>(msg: M) -> G2Projective

Returns a hash of the given message in G2 using the standard hash-to-curve algorithm (RFC 9380 / draft-irtf-cfrg-hash-to-curve).

This implementation uses the recommended domain separation tag and provides proper security properties required for BLS signatures.

This function is useful when you need to pre-hash a message for use with PublicKey::verify_g2 or SecretKey::sign_g2, or when implementing custom signature schemes.

Example

use threshold_pairing::{hash_g2, SecretKey};

let sk = SecretKey::random();
let pk = sk.public_key();

let message = b"Hello, world!";
let hash = hash_g2(message);

// Sign using the pre-computed hash
let sig = sk.sign_g2(hash);

// Verify using the same hash
assert!(pk.verify_g2(&sig, hash));