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Extract hasher utility function

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Thomas Eizinger 2021-05-11 12:09:15 +10:00
parent be7cdb23c3
commit fb36b7fe4f
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GPG Key ID: 651AC83A6C6C8B96
1 changed files with 27 additions and 31 deletions
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58
monero-adaptor/src/clsag.rs
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@ -30,16 +30,7 @@ pub fn sign(
pseudo_output_commitment, pseudo_output_commitment,
msg, msg,
); );
let h_0 = { let h_0 = hash_to_scalar(&[&prefix, L.compress().as_bytes(), R.compress().as_bytes()]);
let mut keccak = Keccak::v256();
keccak.update(&prefix);
keccak.update(L.compress().as_bytes());
keccak.update(R.compress().as_bytes());
let mut output = [0u8; 32];
keccak.finalize(&mut output);
Scalar::from_bytes_mod_order(output)
};
let mus = AggregationHashes::new(&ring, &commitment_ring, I, pseudo_output_commitment, H_p_pk); let mus = AggregationHashes::new(&ring, &commitment_ring, I, pseudo_output_commitment, H_p_pk);
@ -138,15 +129,11 @@ fn challenge(
let L_i = compute_L(h_prev, mus, s_i, pk_i, adjusted_commitment_i); let L_i = compute_L(h_prev, mus, s_i, pk_i, adjusted_commitment_i);
let R_i = compute_R(h_prev, mus, pk_i, s_i, I, D); let R_i = compute_R(h_prev, mus, pk_i, s_i, I, D);
let mut hasher = Keccak::v256(); hash_to_scalar(&[
hasher.update(prefix); prefix,
hasher.update(&L_i.compress().as_bytes().to_vec()); L_i.compress().as_bytes().as_ref(),
hasher.update(&R_i.compress().as_bytes().to_vec()); R_i.compress().as_bytes().as_ref(),
])
let mut output = [0u8; 32];
hasher.finalize(&mut output);
Scalar::from_bytes_mod_order(output)
} }
// L_i = s_i * G + c_p * pk_i + c_c * (commitment_i - pseudoutcommitment) // L_i = s_i * G + c_p * pk_i + c_c * (commitment_i - pseudoutcommitment)
@ -233,18 +220,14 @@ impl AggregationHashes {
z_key_image: &CompressedEdwardsY, z_key_image: &CompressedEdwardsY,
pseudo_output_commitment: &CompressedEdwardsY, pseudo_output_commitment: &CompressedEdwardsY,
) -> Scalar { ) -> Scalar {
let mut hasher = Keccak::v256(); hash_to_scalar(&[
hasher.update(domain_prefix); domain_prefix,
hasher.update(ring); ring,
hasher.update(commitment_ring); commitment_ring,
hasher.update(I.as_bytes()); I.as_bytes(),
hasher.update(z_key_image.as_bytes()); z_key_image.as_bytes(),
hasher.update(pseudo_output_commitment.as_bytes()); pseudo_output_commitment.as_bytes(),
])
let mut hash = [0u8; 32];
hasher.finalize(&mut hash);
Scalar::from_bytes_mod_order(hash)
} }
} }
@ -293,3 +276,16 @@ impl From<Signature> for monero::util::ringct::Clsag {
} }
} }
} }
fn hash_to_scalar(elements: &[&[u8]]) -> Scalar {
let mut hasher = Keccak::v256();
for element in elements {
hasher.update(element);
}
let mut hash = [0u8; 32];
hasher.finalize(&mut hash);
Scalar::from_bytes_mod_order(hash)
}