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Add methods for deriving static master and root keys.

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This commit is contained in:
akwizgran
2019-05-30 14:30:39 +01:00
parent b222107044
commit 9b4f60088f
3 changed files with 66 additions and 8 deletions
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30
bramble-core/src/main/java/org/briarproject/bramble/crypto/TransportCryptoImpl.java
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@@ -1,6 +1,8 @@
package org.briarproject.bramble.crypto;
import org.briarproject.bramble.api.crypto.CryptoComponent;
import org.briarproject.bramble.api.crypto.KeyPair;
import org.briarproject.bramble.api.crypto.PublicKey;
import org.briarproject.bramble.api.crypto.SecretKey;
import org.briarproject.bramble.api.crypto.TransportCrypto;
import org.briarproject.bramble.api.plugin.TransportId;
@@ -10,9 +12,12 @@ import org.briarproject.bramble.api.transport.TransportKeys;
import org.spongycastle.crypto.Digest;
import org.spongycastle.crypto.digests.Blake2bDigest;
import java.security.GeneralSecurityException;
import javax.inject.Inject;
import static java.lang.System.arraycopy;
import static org.briarproject.bramble.api.Bytes.compare;
import static org.briarproject.bramble.api.transport.TransportConstants.ALICE_HANDSHAKE_HEADER_LABEL;
import static org.briarproject.bramble.api.transport.TransportConstants.ALICE_HANDSHAKE_TAG_LABEL;
import static org.briarproject.bramble.api.transport.TransportConstants.ALICE_HEADER_LABEL;
@@ -21,7 +26,10 @@ import static org.briarproject.bramble.api.transport.TransportConstants.BOB_HAND
import static org.briarproject.bramble.api.transport.TransportConstants.BOB_HANDSHAKE_TAG_LABEL;
import static org.briarproject.bramble.api.transport.TransportConstants.BOB_HEADER_LABEL;
import static org.briarproject.bramble.api.transport.TransportConstants.BOB_TAG_LABEL;
import static org.briarproject.bramble.api.transport.TransportConstants.CONTACT_ROOT_KEY_LABEL;
import static org.briarproject.bramble.api.transport.TransportConstants.PENDING_CONTACT_ROOT_KEY_LABEL;
import static org.briarproject.bramble.api.transport.TransportConstants.ROTATE_LABEL;
import static org.briarproject.bramble.api.transport.TransportConstants.STATIC_MASTER_KEY_LABEL;
import static org.briarproject.bramble.api.transport.TransportConstants.TAG_LENGTH;
import static org.briarproject.bramble.util.ByteUtils.INT_16_BYTES;
import static org.briarproject.bramble.util.ByteUtils.INT_64_BYTES;
@@ -40,6 +48,28 @@ class TransportCryptoImpl implements TransportCrypto {
this.crypto = crypto;
}
@Override
public SecretKey deriveStaticMasterKey(PublicKey theirHandshakePublicKey,
KeyPair ourHandshakeKeyPair) throws GeneralSecurityException {
byte[] theirPublic = theirHandshakePublicKey.getEncoded();
byte[] ourPublic = ourHandshakeKeyPair.getPublic().getEncoded();
boolean alice = compare(ourPublic, theirPublic) < 0;
byte[][] inputs = {
alice ? ourPublic : theirPublic,
alice ? theirPublic : ourPublic
};
return crypto.deriveSharedSecret(STATIC_MASTER_KEY_LABEL,
theirHandshakePublicKey, ourHandshakeKeyPair, inputs);
}
@Override
public SecretKey deriveHandshakeRootKey(SecretKey staticMasterKey,
boolean pendingContact) {
String label = pendingContact ?
PENDING_CONTACT_ROOT_KEY_LABEL : CONTACT_ROOT_KEY_LABEL;
return crypto.deriveKey(label, staticMasterKey);
}
@Override
public TransportKeys deriveRotationKeys(TransportId t,
SecretKey rootKey, long timePeriod, boolean weAreAlice,