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Protocol versioning for BTP.

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This commit is contained in:
akwizgran
2017-07-03 15:57:27 +01:00
parent ecf7cf14ae
commit c4540a03cd
12 changed files with 346 additions and 99 deletions
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3
bramble-api/src/main/java/org/briarproject/bramble/api/crypto/CryptoComponent.java
View File

@@ -137,7 +137,8 @@ public interface CryptoComponent {
TransportKeys rotateTransportKeys(TransportKeys k, long rotationPeriod);
/** Encodes the pseudo-random tag that is used to recognise a stream. */
void encodeTag(byte[] tag, SecretKey tagKey, long streamNumber);
void encodeTag(byte[] tag, SecretKey tagKey, int protocolVersion,
long streamNumber);
/**
* Signs the given byte[] with the given PrivateKey.

20
bramble-api/src/main/java/org/briarproject/bramble/api/transport/TransportConstants.java
View File

@@ -4,6 +4,11 @@ import org.briarproject.bramble.api.crypto.SecretKey;
public interface TransportConstants {
/**
* The current version of the transport protocol.
*/
int PROTOCOL_VERSION = 3;
/**
* The length of the pseudo-random tag in bytes.
*/
@@ -14,21 +19,22 @@ public interface TransportConstants {
*/
int STREAM_HEADER_NONCE_LENGTH = 24;
/**
* The length of the stream header initialisation vector (IV) in bytes.
*/
int STREAM_HEADER_IV_LENGTH = STREAM_HEADER_NONCE_LENGTH - 8;
/**
* The length of the message authentication code (MAC) in bytes.
*/
int MAC_LENGTH = 16;
/**
* The length of the stream header plaintext in bytes. The stream header
* contains the protocol version, stream number and frame key.
*/
int STREAM_HEADER_PLAINTEXT_LENGTH = 2 + 8 + SecretKey.LENGTH;
/**
* The length of the stream header in bytes.
*/
int STREAM_HEADER_LENGTH = STREAM_HEADER_IV_LENGTH + SecretKey.LENGTH
+ MAC_LENGTH;
int STREAM_HEADER_LENGTH = STREAM_HEADER_NONCE_LENGTH
+ STREAM_HEADER_PLAINTEXT_LENGTH + MAC_LENGTH;
/**
* The length of the frame nonce in bytes.