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handle metadata keys in migration and preserve first 96 bits

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This commit is contained in:
Robert Habermeier 2016-07-04 14:13:48 +02:00
parent 0bbdcb13b3
commit e411399f13
1 changed files with 20 additions and 4 deletions
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24
ethcore/src/migrations/state/v7.rs
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@ -12,17 +12,33 @@ impl SimpleMigration for ToV7 {
}
fn simple_migrate(&self, mut key: Vec<u8>, value: Vec<u8>) -> Option<(Vec<u8>, Vec<u8>)> {
if key.len() != 32 {
// metadata key, ignore.
return Some((key, value));
}
let val_hash = value.sha3();
assert!(key.len() == 32); // all keys in the state db are hashes.
let key_h = H256::from_slice(&key[..]);
if key_h != val_hash {
// this is a key which has been xor'd with an address.
// recover the address
// recover the address.
let address = key_h ^ val_hash;
// check that the address is actually a 20-byte value.
// the leftmost 12 bytes should be zero.
if &address[0..12] != &[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] {
// metadata key that was 32 bytes, ignore.
return Some((key, value));
}
let address_hash = address.sha3();
let new_key = address_hash ^ val_hash;
key.copy_from_slice(&new_key[..]);
// create the xor'd key in place.
key.copy_from_slice(&*val_hash);
let last_dst: &[u8] = &*address_hash;
for (k, a) in key[12..].iter_mut().zip(&last_dst[12..]) {
*k ^= *a;
}
}
// nothing to do here
Some((key, value))