Function grin_core::libtx::aggsig::calculate_partial_sig

pub fn calculate_partial_sig(
    secp: &Secp256k1, 
    sec_key: &SecretKey, 
    sec_nonce: &SecretKey, 
    nonce_sum: &PublicKey, 
    pubkey_sum: Option<&PublicKey>, 
    msg: &Message
) -> Result<Signature, Error>

Calculates a partial signature given the signer's secure key, the sum of all public nonces and (optionally) the sum of all public keys.

Arguments

• secp - A Secp256k1 Context initialized for Signing
• sec_key - The signer's secret key
• sec_nonce - The signer's secret nonce (the public version of which was added to the nonce_sum total)
• nonce_sum - The sum of the public nonces of all signers participating in the full signature. This value is encoded in e.
• pubkey_sum - (Optional) The sum of the public keys of all signers participating in the full signature. If included, this value is encoded in e.
• msg - The message to sign.

Example

use rand::thread_rng;
use core::libtx::aggsig;
use util::secp::key::{PublicKey, SecretKey};
use util::secp::{ContextFlag, Secp256k1, Message};

let secp = Secp256k1::with_caps(ContextFlag::SignOnly);
let secret_nonce = aggsig::create_secnonce(&secp).unwrap();
let secret_key = SecretKey::new(&secp, &mut thread_rng());
let pub_nonce_sum = PublicKey::from_secret_key(&secp, &secret_nonce).unwrap();
// ... Add all other participating nonces
let pub_key_sum = PublicKey::from_secret_key(&secp, &secret_key).unwrap();
// ... Add all other participating keys
let mut msg_bytes = [0; 32];
// ... Encode message
let message = Message::from_slice(&msg_bytes).unwrap();
let sig_part = aggsig::calculate_partial_sig(
       &secp,
       &secret_key,
       &secret_nonce,
       &pub_nonce_sum,
       Some(&pub_key_sum),
       &message,
).unwrap();