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Implement view tags

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This commit is contained in:
Luke Parker
2022-07-27 06:29:14 -04:00
parent 755dc84859
commit bba93a64c2
4 changed files with 44 additions and 25 deletions
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25
coins/monero/src/wallet/mod.rs
View File

@@ -35,22 +35,29 @@ pub(crate) fn uniqueness(inputs: &[Input]) -> [u8; 32] {
hash(&u)
}
// Hs(8Ra || o) with https://github.com/monero-project/research-lab/issues/103 as an option
// Hs("view_tag" || 8Ra || o) and Hs(8Ra || o) with uniqueness inclusion as an option
#[allow(non_snake_case)]
pub(crate) fn shared_key(
uniqueness: Option<[u8; 32]>,
s: Scalar,
P: &EdwardsPoint,
o: usize,
) -> Scalar {
// uniqueness
let mut shared = uniqueness.map_or(vec![], |uniqueness| uniqueness.to_vec());
// || 8Ra
shared.extend((s * P).mul_by_cofactor().compress().to_bytes().to_vec());
) -> (u8, Scalar) {
// 8Ra
let mut output_derivation = (s * P).mul_by_cofactor().compress().to_bytes().to_vec();
// || o
write_varint(&o.try_into().unwrap(), &mut shared).unwrap();
// Hs()
hash_to_scalar(&shared)
write_varint(&o.try_into().unwrap(), &mut output_derivation).unwrap();
let view_tag = hash(&[b"view_tag".as_ref(), &output_derivation].concat())[0];
// uniqueness ||
let shared_key = if let Some(uniqueness) = uniqueness {
[uniqueness.as_ref(), &output_derivation].concat().to_vec()
} else {
output_derivation
};
(view_tag, hash_to_scalar(&shared_key))
}
pub(crate) fn amount_encryption(amount: u64, key: Scalar) -> [u8; 8] {