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minor update

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This commit is contained in:
jonesmarvin8 2026-02-26 17:07:45 -05:00
parent 1b2aacc862
commit bbb9613e06
1 changed files with 20 additions and 0 deletions
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20
nssa/src/signature/private_key.rs
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@ -1,4 +1,5 @@
use rand::{Rng, rngs::OsRng}; use rand::{Rng, rngs::OsRng};
use risc0_zkvm::sha::{Impl, Sha256};
use serde::{Deserialize, Serialize}; use serde::{Deserialize, Serialize};
use crate::error::NssaError; use crate::error::NssaError;
@ -35,6 +36,25 @@ impl PrivateKey {
pub fn value(&self) -> &[u8; 32] { pub fn value(&self) -> &[u8; 32] {
&self.0 &self.0
} }
pub fn tweak(value: &[u8; 32]) -> Result<Self, NssaError> {
assert!(Self::is_valid_key(*value));
let sk = secp256k1::SecretKey::from_byte_array(*value).unwrap();
let mut bytes = vec![];
let pk = secp256k1::PublicKey::from_secret_key(&secp256k1::Secp256k1::new(), &sk);
bytes.extend_from_slice(&secp256k1::PublicKey::serialize(&pk));
let hashed: [u8; 32] = Impl::hash_bytes(&bytes).as_bytes().try_into().unwrap();
let tweaked_sk = PrivateKey::try_new(
sk.add_tweak(&secp256k1::Scalar::from_be_bytes(hashed).unwrap())
.expect("Expect a valid Scalar")
.secret_bytes(),
);
tweaked_sk
}
} }
#[cfg(test)] #[cfg(test)]