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DarkCrystal implementation which calls SecretSharingWrapper

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ameba23
2021-03-02 08:51:00 +01:00
parent 3c61f499d9
commit 7da49ae6df
1 changed files with 43 additions and 1 deletions
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44
briar-android/src/main/java/org/briarproject/briar/android/socialbackup/DarkCrystalImpl.java
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@@ -1,4 +1,46 @@
package org.briarproject.briar.android.socialbackup;
import org.briarproject.bramble.api.crypto.SecretKey;
import org.briarproject.briar.api.socialbackup.Shard;
import org.briarproject.briar.socialbackup.DarkCrystal;
import org.magmacollective.darkcrystal.secretsharingwrapper.SecretSharingWrapper;
public class DarkCrystalImpl {
import java.security.GeneralSecurityException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
import static org.briarproject.briar.socialbackup.SocialBackupConstants.SECRET_ID_BYTES;
public class DarkCrystalImpl implements DarkCrystal {
@Override
public List<Shard> createShards(SecretKey secret, int numShards,
int threshold) {
Random random = new Random();
byte[] secretId = new byte[SECRET_ID_BYTES];
random.nextBytes(secretId);
List<byte[]> shardsBytes = SecretSharingWrapper.share(secret.getBytes(), numShards, threshold);
List<Shard> shards = new ArrayList<>(numShards);
for (byte[] shardBytes : shardsBytes) {
shards.add(new Shard(secretId, shardBytes));
}
return shards;
}
@Override
public SecretKey combineShards(List<Shard> shards) throws
GeneralSecurityException {
// Check each shard has the same secret Id
byte[] secretId = shards.get(0).getSecretId();
for (Shard shard : shards) {
if (!Arrays.equals(shard.getSecretId(), secretId)) throw new GeneralSecurityException();
}
List<byte[]> shardsBytes = new ArrayList<>(shards.size());
for (Shard shard : shards) {
shardsBytes.add(shard.getShard());
}
byte[] secretBytes = SecretSharingWrapper.combine(shardsBytes);
return new SecretKey(secretBytes);
}
}