Function secret_key_for_digit

bitvm/src/signatures/winternitz.rs:69–76

Returns the secret key for given digit, appending the representation of it in bigger endian bytes to the message secret key

(secret_key: &SecretKey, mut digit_index: u32)

/// Returns the secret key for given digit, appending the representation of it in bigger endian bytes to the message secret key
pub fn secret_key_for_digit(secret_key: &SecretKey, mut digit_index: u32) -> hash160::Hash {
    let mut secret_i = secret_key.clone();
    while digit_index > 0 {
        secret_i.push((digit_index & 255) as u8);
        digit_index >>= 8;
    }
    hash160::Hash::hash(&secret_i)
}

/// Returns the signature of a given digit, requires the digit index to modify the secret key for each digit
pub fn digit_signature(secret_key: &SecretKey, digit_index: u32, message_digit: u32) -> HashOut {