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preserve first 96 bits of keys when combining

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This commit is contained in:
Robert Habermeier 2016-07-04 14:13:36 +02:00
parent 9b28e97ca8
commit 0bbdcb13b3
1 changed files with 11 additions and 1 deletions
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12
ethcore/src/account_db.rs
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@ -4,8 +4,18 @@ use util::*;
static NULL_RLP_STATIC: [u8; 1] = [0x80; 1]; static NULL_RLP_STATIC: [u8; 1] = [0x80; 1];
#[inline] #[inline]
// combines a key with an address hash to ensure uniqueness.
// leaves the first 96 bits untouched in order to support partial key lookup.
fn combine_key<'a>(address_hash: &'a H256, key: &'a H256) -> H256 { fn combine_key<'a>(address_hash: &'a H256, key: &'a H256) -> H256 {
address_hash ^ key let mut dst = key.clone();
{
let last_dst: &mut [u8] = &mut *dst;
let last_src: &[u8] = &*address_hash;
for (k, a) in last_dst[8..].iter_mut().zip(&last_src[8..]) {
*k ^= *a
}
}
dst
} }
// TODO: introduce HashDBMut? // TODO: introduce HashDBMut?