Function recover_public_key_from_hash

pub fn recover_public_key_from_hash(
    pk: &[u8],
    sig: &Signature,
    hash: &[u8; 32],
) -> Result<u8, Secp256k1Error>

Recovers the v value from a signature for a pre-hashed message. The hash parameter is already a 32-byte digest, not raw bytes.