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Deduplicate Sapling key agreement logic

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This commit is contained in:
Jack Grigg
2019-03-23 17:51:30 +13:00
parent 247f3fb038
commit 2b1583d75f
3 changed files with 37 additions and 17 deletions
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11
librustzcash/src/rustzcash.rs
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@@ -58,7 +58,7 @@ use std::ffi::OsString;
use std::os::windows::ffi::OsStringExt;
use sapling_crypto::primitives::{ProofGenerationKey, ViewingKey};
use zcash_primitives::{sapling::spend_sig, JUBJUB};
use zcash_primitives::{note_encryption::sapling_ka_agree, sapling::spend_sig, JUBJUB};
use zcash_proofs::{
load_parameters,
sapling::{CommitmentTreeWitness, SaplingProvingContext, SaplingVerificationContext},
@@ -536,15 +536,12 @@ pub extern "system" fn librustzcash_sapling_ka_agree(
Err(_) => return false,
};
// Multiply by 8
let p = p.mul_by_cofactor(&JUBJUB);
// Multiply by sk
let p = p.mul(sk, &JUBJUB);
// Compute key agreement
let ka = sapling_ka_agree(&sk, &p);
// Produce result
let result = unsafe { &mut *result };
p.write(&mut result[..]).expect("length is not 32 bytes");
result.copy_from_slice(&ka);
true
}