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Add basic hash tree API and implementation.

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akwizgran
2018-12-06 16:07:22 +00:00
parent f915eb4d36
commit 4b04e6a21d
7 changed files with 126 additions and 0 deletions
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40
bramble-core/src/main/java/org/briarproject/bramble/sync/tree/TreeHasherImpl.java Normal file
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package org.briarproject.bramble.sync.tree;
import org.briarproject.bramble.api.crypto.CryptoComponent;
import org.briarproject.bramble.api.sync.tree.LeafNode;
import org.briarproject.bramble.api.sync.tree.ParentNode;
import org.briarproject.bramble.api.sync.tree.TreeHash;
import org.briarproject.bramble.api.sync.tree.TreeHasher;
import org.briarproject.bramble.api.sync.tree.TreeNode;
import javax.inject.Inject;
import static org.briarproject.bramble.api.sync.Message.FORMAT_VERSION;
import static org.briarproject.bramble.api.sync.MessageId.BLOCK_LABEL;
import static org.briarproject.bramble.api.sync.MessageId.TREE_LABEL;
class TreeHasherImpl implements TreeHasher {
private static final byte[] FORMAT_VERSION_BYTES =
new byte[] {FORMAT_VERSION};
private final CryptoComponent crypto;
@Inject
TreeHasherImpl(CryptoComponent crypto) {
this.crypto = crypto;
}
@Override
public LeafNode hashBlock(int blockNumber, byte[] data) {
byte[] hash = crypto.hash(BLOCK_LABEL, FORMAT_VERSION_BYTES, data);
return new LeafNode(new TreeHash(hash), blockNumber);
}
@Override
public ParentNode mergeTrees(TreeNode left, TreeNode right) {
byte[] hash = crypto.hash(TREE_LABEL, FORMAT_VERSION_BYTES,
left.getHash().getBytes(), right.getHash().getBytes());
return new ParentNode(new TreeHash(hash), left, right);
}
}