mirror of
https://code.briarproject.org/briar/briar.git
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IntroductionCrypto: Create dedicated class to handle introduction related crypto
This commit is contained in:
Torsten Grote
@@ -10,4 +10,20 @@ public interface IntroductionConstants {
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*/
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int MAX_REQUEST_MESSAGE_LENGTH = MAX_MESSAGE_BODY_LENGTH - 1024;
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String LABEL_SESSION_ID = "org.briarproject.briar.introduction/SESSION_ID";
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String LABEL_MASTER_KEY = "org.briarproject.briar.introduction/MASTER_KEY";
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String LABEL_ALICE_MAC_KEY =
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"org.briarproject.briar.introduction/ALICE_MAC_KEY";
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String LABEL_BOB_MAC_KEY =
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"org.briarproject.briar.introduction/BOB_MAC_KEY";
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String LABEL_AUTH_MAC = "org.briarproject.briar.introduction/AUTH_MAC";
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String LABEL_AUTH_SIGN = "org.briarproject.briar.introduction/AUTH_SIGN";
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String LABEL_AUTH_NONCE = "org.briarproject.briar.introduction/AUTH_NONCE";
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}
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@@ -0,0 +1,88 @@
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package org.briarproject.briar.introduction2;
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import org.briarproject.bramble.api.FormatException;
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import org.briarproject.bramble.api.crypto.KeyPair;
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import org.briarproject.bramble.api.crypto.SecretKey;
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import org.briarproject.bramble.api.identity.Author;
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import org.briarproject.bramble.api.identity.AuthorId;
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import org.briarproject.bramble.api.identity.LocalAuthor;
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import org.briarproject.briar.api.client.SessionId;
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import java.security.GeneralSecurityException;
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interface IntroductionCrypto {
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/**
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* Returns the {@link SessionId} based on the introducer
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* and the two introducees.
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*
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* Note: The roles of Alice and Bob can be switched.
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*/
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SessionId getSessionId(Author introducer, Author alice, Author bob);
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/**
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* Returns true if the first author is indeed alice
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*/
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boolean isAlice(AuthorId alice, AuthorId bob);
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/**
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* Generates an agreement key pair.
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*/
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KeyPair generateKeyPair();
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/**
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* Derives a session master key for Alice or Bob.
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*
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* @param alice true if the session owner is Alice
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* @return The secret master key
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*/
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SecretKey deriveMasterKey(IntroduceeSession s, boolean alice)
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throws GeneralSecurityException;
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/**
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* Derives a MAC key from the session's master key for Alice or Bob.
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*
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* @param masterKey The key returned by {@link #deriveMasterKey(IntroduceeSession, boolean)}
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* @param alice true for Alice's MAC key, false for Bob's
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* @return The MAC key
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*/
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SecretKey deriveMacKey(SecretKey masterKey, boolean alice);
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/**
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* Generates a MAC that covers both introducee's ephemeral public keys and
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* transport properties.
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*/
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byte[] mac(SecretKey macKey, IntroduceeSession s, AuthorId localAuthorId,
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boolean alice) throws FormatException;
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/**
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* Verifies a received MAC
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*
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* @param mac The MAC to verify
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* as returned by {@link #deriveMasterKey(IntroduceeSession, boolean)}
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* @throws GeneralSecurityException if the verification fails
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*/
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void verifyMac(byte[] mac, IntroduceeSession s, AuthorId localAuthorId)
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throws GeneralSecurityException, FormatException;
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/**
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* Signs a nonce derived from the macKey
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* with the local introducee's identity private key.
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*
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* @param macKey The corresponding MAC key for the signer's role
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* @param privateKey The identity private key
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* (from {@link LocalAuthor#getPrivateKey()})
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* @return The signature as a byte array
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*/
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byte[] sign(SecretKey macKey, byte[] privateKey)
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throws GeneralSecurityException;
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/**
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* Verifies the signature on a corresponding MAC key.
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*
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* @throws GeneralSecurityException if the signature is invalid
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*/
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void verifySignature(byte[] signature, IntroduceeSession s,
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AuthorId localAuthorId) throws GeneralSecurityException;
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}
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@@ -0,0 +1,216 @@
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package org.briarproject.briar.introduction2;
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import org.briarproject.bramble.api.Bytes;
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import org.briarproject.bramble.api.FormatException;
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import org.briarproject.bramble.api.client.ClientHelper;
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import org.briarproject.bramble.api.crypto.CryptoComponent;
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import org.briarproject.bramble.api.crypto.KeyPair;
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import org.briarproject.bramble.api.crypto.KeyParser;
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import org.briarproject.bramble.api.crypto.PrivateKey;
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import org.briarproject.bramble.api.crypto.PublicKey;
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import org.briarproject.bramble.api.crypto.SecretKey;
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import org.briarproject.bramble.api.data.BdfList;
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import org.briarproject.bramble.api.identity.Author;
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import org.briarproject.bramble.api.identity.AuthorId;
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import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
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import org.briarproject.bramble.api.plugin.TransportId;
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import org.briarproject.bramble.api.properties.TransportProperties;
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import org.briarproject.briar.api.client.SessionId;
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import java.security.GeneralSecurityException;
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import java.util.Arrays;
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import java.util.Map;
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import javax.annotation.concurrent.Immutable;
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import javax.inject.Inject;
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import static org.briarproject.briar.api.introduction2.IntroductionConstants.LABEL_ALICE_MAC_KEY;
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import static org.briarproject.briar.api.introduction2.IntroductionConstants.LABEL_AUTH_MAC;
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import static org.briarproject.briar.api.introduction2.IntroductionConstants.LABEL_AUTH_NONCE;
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import static org.briarproject.briar.api.introduction2.IntroductionConstants.LABEL_AUTH_SIGN;
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import static org.briarproject.briar.api.introduction2.IntroductionConstants.LABEL_BOB_MAC_KEY;
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import static org.briarproject.briar.api.introduction2.IntroductionConstants.LABEL_MASTER_KEY;
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import static org.briarproject.briar.api.introduction2.IntroductionConstants.LABEL_SESSION_ID;
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import static org.briarproject.briar.api.introduction2.IntroductionManager.CLIENT_VERSION;
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@Immutable
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@NotNullByDefault
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class IntroductionCryptoImpl implements IntroductionCrypto {
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private final CryptoComponent crypto;
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private final ClientHelper clientHelper;
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@Inject
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IntroductionCryptoImpl(
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CryptoComponent crypto,
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ClientHelper clientHelper) {
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this.crypto = crypto;
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this.clientHelper = clientHelper;
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}
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@Override
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public SessionId getSessionId(Author introducer, Author alice,
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Author bob) {
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boolean isAlice = isAlice(alice.getId(), bob.getId());
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byte[] hash = crypto.hash(
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LABEL_SESSION_ID,
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introducer.getId().getBytes(),
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isAlice ? alice.getId().getBytes() : bob.getId().getBytes(),
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isAlice ? bob.getId().getBytes() : alice.getId().getBytes()
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);
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return new SessionId(hash);
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}
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@Override
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public KeyPair generateKeyPair() {
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return crypto.generateAgreementKeyPair();
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}
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@Override
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public boolean isAlice(AuthorId alice, AuthorId bob) {
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byte[] a = alice.getBytes();
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byte[] b = bob.getBytes();
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return Bytes.COMPARATOR.compare(new Bytes(a), new Bytes(b)) < 0;
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}
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@Override
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@SuppressWarnings("ConstantConditions")
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public SecretKey deriveMasterKey(IntroduceeSession s, boolean alice)
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throws GeneralSecurityException {
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return deriveMasterKey(s.getEphemeralPublicKey(),
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s.getEphemeralPrivateKey(), s.getRemotePublicKey(), alice);
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}
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SecretKey deriveMasterKey(byte[] publicKey, byte[] privateKey,
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byte[] remotePublicKey, boolean alice)
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throws GeneralSecurityException {
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KeyParser kp = crypto.getAgreementKeyParser();
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PublicKey remoteEphemeralPublicKey = kp.parsePublicKey(remotePublicKey);
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PublicKey ephemeralPublicKey = kp.parsePublicKey(publicKey);
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PrivateKey ephemeralPrivateKey = kp.parsePrivateKey(privateKey);
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KeyPair keyPair = new KeyPair(ephemeralPublicKey, ephemeralPrivateKey);
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return crypto.deriveSharedSecret(
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LABEL_MASTER_KEY,
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remoteEphemeralPublicKey,
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keyPair,
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new byte[] {CLIENT_VERSION},
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alice ? publicKey : remotePublicKey,
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alice ? remotePublicKey : publicKey
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);
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}
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@Override
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public SecretKey deriveMacKey(SecretKey masterKey, boolean alice) {
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return crypto.deriveKey(
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alice ? LABEL_ALICE_MAC_KEY : LABEL_BOB_MAC_KEY,
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masterKey
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);
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}
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@Override
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@SuppressWarnings("ConstantConditions")
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public byte[] mac(SecretKey macKey, IntroduceeSession s,
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AuthorId localAuthorId, boolean alice) throws FormatException {
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return mac(macKey, s.getIntroducer().getId(), localAuthorId,
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s.getRemoteAuthor().getId(), s.getAcceptTimestamp(),
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s.getRemoteAcceptTimestamp(), s.getEphemeralPublicKey(),
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s.getRemotePublicKey(), s.getTransportProperties(),
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s.getRemoteTransportProperties(), alice);
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}
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byte[] mac(SecretKey macKey, AuthorId introducerId,
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AuthorId localAuthorId, AuthorId remoteAuthorId,
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long acceptTimestamp, long remoteAcceptTimestamp,
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byte[] ephemeralPublicKey, byte[] remoteEphemeralPublicKey,
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Map<TransportId, TransportProperties> transportProperties,
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Map<TransportId, TransportProperties> remoteTransportProperties,
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boolean alice) throws FormatException {
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BdfList localInfo = BdfList.of(
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localAuthorId,
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acceptTimestamp,
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ephemeralPublicKey,
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clientHelper.toDictionary(transportProperties)
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);
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BdfList remoteInfo = BdfList.of(
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remoteAuthorId,
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remoteAcceptTimestamp,
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remoteEphemeralPublicKey,
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clientHelper.toDictionary(remoteTransportProperties)
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);
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BdfList macList = BdfList.of(
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introducerId,
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alice ? localInfo : remoteInfo,
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alice ? remoteInfo : localInfo
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);
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return crypto.mac(
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LABEL_AUTH_MAC,
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macKey,
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clientHelper.toByteArray(macList)
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);
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}
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@Override
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@SuppressWarnings("ConstantConditions")
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public void verifyMac(byte[] mac, IntroduceeSession s,
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AuthorId localAuthorId)
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throws GeneralSecurityException, FormatException {
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boolean alice = isAlice(localAuthorId, s.getRemoteAuthor().getId());
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verifyMac(mac, new SecretKey(s.getMasterKey()),
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s.getIntroducer().getId(), localAuthorId,
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s.getRemoteAuthor().getId(), s.getAcceptTimestamp(),
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s.getRemoteAcceptTimestamp(), s.getEphemeralPublicKey(),
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s.getRemotePublicKey(), s.getTransportProperties(),
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s.getRemoteTransportProperties(), !alice);
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}
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void verifyMac(byte[] mac, SecretKey masterKey,
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AuthorId introducerId, AuthorId localAuthorId,
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AuthorId remoteAuthorId, long acceptTimestamp,
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long remoteAcceptTimestamp, byte[] ephemeralPublicKey,
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byte[] remoteEphemeralPublicKey,
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Map<TransportId, TransportProperties> transportProperties,
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Map<TransportId, TransportProperties> remoteTransportProperties,
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boolean alice) throws GeneralSecurityException, FormatException {
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SecretKey macKey = deriveMacKey(masterKey, alice);
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byte[] calculatedMac =
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mac(macKey, introducerId, localAuthorId, remoteAuthorId,
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acceptTimestamp, remoteAcceptTimestamp,
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ephemeralPublicKey, remoteEphemeralPublicKey,
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transportProperties, remoteTransportProperties, !alice);
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if (!Arrays.equals(mac, calculatedMac)) {
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throw new GeneralSecurityException();
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}
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}
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@Override
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public byte[] sign(SecretKey macKey, byte[] privateKey)
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throws GeneralSecurityException {
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return crypto.sign(
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LABEL_AUTH_SIGN,
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getNonce(macKey),
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privateKey
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);
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}
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@Override
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@SuppressWarnings("ConstantConditions")
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public void verifySignature(byte[] signature, IntroduceeSession s,
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AuthorId localAuthorId) throws GeneralSecurityException {
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boolean alice = isAlice(s.getRemoteAuthor().getId(), localAuthorId);
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SecretKey macKey = deriveMacKey(new SecretKey(s.getMasterKey()), alice);
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verifySignature(macKey, s.getRemoteAuthor().getPublicKey(), signature);
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}
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void verifySignature(SecretKey macKey, byte[] publicKey,
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byte[] signature) throws GeneralSecurityException {
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byte[] nonce = getNonce(macKey);
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if (!crypto.verify(LABEL_AUTH_SIGN, nonce, publicKey, signature)) {
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throw new GeneralSecurityException();
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}
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}
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private byte[] getNonce(SecretKey macKey) {
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return crypto.mac(LABEL_AUTH_NONCE, macKey);
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}
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}
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@@ -0,0 +1,142 @@
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package org.briarproject.briar.introduction2;
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import org.briarproject.bramble.api.client.ClientHelper;
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import org.briarproject.bramble.api.crypto.CryptoComponent;
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import org.briarproject.bramble.api.crypto.KeyPair;
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import org.briarproject.bramble.api.crypto.SecretKey;
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import org.briarproject.bramble.api.identity.Author;
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import org.briarproject.bramble.api.identity.AuthorFactory;
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import org.briarproject.bramble.api.identity.LocalAuthor;
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import org.briarproject.bramble.api.plugin.TransportId;
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import org.briarproject.bramble.api.properties.TransportProperties;
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import org.briarproject.bramble.test.BrambleTestCase;
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import org.briarproject.briar.api.client.SessionId;
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import org.briarproject.briar.test.BriarIntegrationTestComponent;
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import org.briarproject.briar.test.DaggerBriarIntegrationTestComponent;
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import org.junit.Test;
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import java.util.Map;
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import javax.inject.Inject;
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import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
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import static org.briarproject.bramble.test.TestUtils.getTransportPropertiesMap;
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import static org.briarproject.bramble.util.StringUtils.fromHexString;
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import static org.junit.Assert.assertArrayEquals;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertFalse;
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import static org.junit.Assert.assertTrue;
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public class IntroductionCryptoImplTest extends BrambleTestCase {
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@Inject
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ClientHelper clientHelper;
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@Inject
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AuthorFactory authorFactory;
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@Inject
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CryptoComponent cryptoComponent;
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private final IntroductionCryptoImpl crypto;
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private final Author introducer;
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private final LocalAuthor alice, bob;
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private final long aliceAcceptTimestamp = 42L;
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private final long bobAcceptTimestamp = 1337L;
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private final SecretKey masterKey =
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new SecretKey(getRandomBytes(SecretKey.LENGTH));
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private final KeyPair aliceEphemeral, bobEphemeral;
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private final Map<TransportId, TransportProperties> aliceTransport =
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getTransportPropertiesMap(3);
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private final Map<TransportId, TransportProperties> bobTransport =
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getTransportPropertiesMap(3);
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public IntroductionCryptoImplTest() {
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BriarIntegrationTestComponent component =
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DaggerBriarIntegrationTestComponent.builder().build();
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component.inject(this);
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crypto = new IntroductionCryptoImpl(cryptoComponent, clientHelper);
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// create actual deterministic authors for testing
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introducer = authorFactory
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.createAuthor("Introducer", new byte[] {0x1, 0x2, 0x3});
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alice = authorFactory.createLocalAuthor("Alice",
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fromHexString(
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"A626F080C94771698F86B4B4094C4F560904B53398805AE02BA2343F1829187A"),
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fromHexString(
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"60F010187AF91ACA15141E8C811EC8E79C7CAA6461C21A852BB03066C89B0A70"));
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bob = authorFactory.createLocalAuthor("Bob",
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fromHexString(
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"A0D0FED1CE4674D8B6441AD0A664E41BF60D489F35DA11F52AF923540848546F"),
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fromHexString(
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"20B25BE7E999F68FE07189449E91984FA79121DBFF28A651669A3CF512D6A758"));
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aliceEphemeral = crypto.generateKeyPair();
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bobEphemeral = crypto.generateKeyPair();
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}
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@Test
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public void testGetSessionId() {
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SessionId s1 = crypto.getSessionId(introducer, alice, bob);
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SessionId s2 = crypto.getSessionId(introducer, bob, alice);
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assertEquals(s1, s2);
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}
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@Test
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public void testIsAlice() {
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assertTrue(crypto.isAlice(alice.getId(), bob.getId()));
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assertFalse(crypto.isAlice(bob.getId(), alice.getId()));
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}
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@Test
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public void testDeriveMasterKey() throws Exception {
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SecretKey aliceMasterKey = crypto.deriveMasterKey(alice.getPublicKey(),
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alice.getPrivateKey(), bob.getPublicKey(), true);
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SecretKey bobMasterKey = crypto.deriveMasterKey(bob.getPublicKey(),
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bob.getPrivateKey(), alice.getPublicKey(), false);
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assertArrayEquals(aliceMasterKey.getBytes(), bobMasterKey.getBytes());
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}
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@Test
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public void testAliceMac() throws Exception {
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SecretKey aliceMacKey = crypto.deriveMacKey(masterKey, true);
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byte[] aliceMac =
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crypto.mac(aliceMacKey, introducer.getId(), alice.getId(),
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bob.getId(), aliceAcceptTimestamp, bobAcceptTimestamp,
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aliceEphemeral.getPublic().getEncoded(),
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bobEphemeral.getPublic().getEncoded(), aliceTransport,
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bobTransport, true);
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crypto.verifyMac(aliceMac, masterKey, introducer.getId(), bob.getId(),
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alice.getId(), bobAcceptTimestamp, aliceAcceptTimestamp,
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bobEphemeral.getPublic().getEncoded(),
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||||
aliceEphemeral.getPublic().getEncoded(), bobTransport,
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||||
aliceTransport, true);
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}
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@Test
|
||||
public void testBobMac() throws Exception {
|
||||
SecretKey bobMacKey = crypto.deriveMacKey(masterKey, false);
|
||||
byte[] bobMac =
|
||||
crypto.mac(bobMacKey, introducer.getId(), bob.getId(),
|
||||
alice.getId(), bobAcceptTimestamp, aliceAcceptTimestamp,
|
||||
bobEphemeral.getPublic().getEncoded(),
|
||||
aliceEphemeral.getPublic().getEncoded(), bobTransport,
|
||||
aliceTransport, false);
|
||||
|
||||
crypto.verifyMac(bobMac, masterKey, introducer.getId(), alice.getId(),
|
||||
bob.getId(), aliceAcceptTimestamp, bobAcceptTimestamp,
|
||||
aliceEphemeral.getPublic().getEncoded(),
|
||||
bobEphemeral.getPublic().getEncoded(), aliceTransport,
|
||||
bobTransport, false);
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testSign() throws Exception {
|
||||
KeyPair keyPair = cryptoComponent.generateSignatureKeyPair();
|
||||
SecretKey macKey = crypto.deriveMacKey(masterKey, true);
|
||||
byte[] signature =
|
||||
crypto.sign(macKey, keyPair.getPrivate().getEncoded());
|
||||
crypto.verifySignature(macKey, keyPair.getPublic().getEncoded(),
|
||||
signature);
|
||||
}
|
||||
|
||||
}
|
||||
@@ -0,0 +1,46 @@
|
||||
package org.briarproject.briar.introduction2;
|
||||
|
||||
import org.briarproject.bramble.api.UniqueId;
|
||||
import org.briarproject.bramble.api.client.ClientHelper;
|
||||
import org.briarproject.bramble.api.crypto.CryptoComponent;
|
||||
import org.briarproject.bramble.api.identity.Author;
|
||||
import org.briarproject.bramble.test.BrambleMockTestCase;
|
||||
import org.briarproject.briar.api.client.SessionId;
|
||||
import org.jmock.Expectations;
|
||||
import org.junit.Test;
|
||||
|
||||
import static org.briarproject.bramble.test.TestUtils.getAuthor;
|
||||
import static org.briarproject.bramble.test.TestUtils.getRandomBytes;
|
||||
import static org.briarproject.briar.api.introduction2.IntroductionConstants.LABEL_SESSION_ID;
|
||||
import static org.junit.Assert.assertEquals;
|
||||
|
||||
public class IntroductionCryptoTest extends BrambleMockTestCase {
|
||||
|
||||
private final CryptoComponent cryptoComponent =
|
||||
context.mock(CryptoComponent.class);
|
||||
private final ClientHelper clientHelper = context.mock(ClientHelper.class);
|
||||
|
||||
private final IntroductionCrypto crypto =
|
||||
new IntroductionCryptoImpl(cryptoComponent, clientHelper);
|
||||
|
||||
private final Author introducer = getAuthor();
|
||||
private final Author alice = getAuthor(), bob = getAuthor();
|
||||
private final byte[] hash = getRandomBytes(UniqueId.LENGTH);
|
||||
|
||||
@Test
|
||||
public void testGetSessionId() {
|
||||
boolean isAlice = crypto.isAlice(alice.getId(), bob.getId());
|
||||
context.checking(new Expectations() {{
|
||||
oneOf(cryptoComponent).hash(
|
||||
LABEL_SESSION_ID,
|
||||
introducer.getId().getBytes(),
|
||||
isAlice ? alice.getId().getBytes() : bob.getId().getBytes(),
|
||||
isAlice ? bob.getId().getBytes() : alice.getId().getBytes()
|
||||
);
|
||||
will(returnValue(hash));
|
||||
}});
|
||||
SessionId sessionId = crypto.getSessionId(introducer, alice, bob);
|
||||
assertEquals(new SessionId(hash), sessionId);
|
||||
}
|
||||
|
||||
}
|
||||
@@ -37,6 +37,7 @@ import org.briarproject.briar.blog.BlogModule;
|
||||
import org.briarproject.briar.client.BriarClientModule;
|
||||
import org.briarproject.briar.forum.ForumModule;
|
||||
import org.briarproject.briar.introduction.IntroductionModule;
|
||||
import org.briarproject.briar.introduction2.IntroductionCryptoImplTest;
|
||||
import org.briarproject.briar.introduction2.MessageEncoderParserIntegrationTest;
|
||||
import org.briarproject.briar.introduction2.SessionEncoderParserIntegrationTest;
|
||||
import org.briarproject.briar.messaging.MessagingModule;
|
||||
@@ -80,6 +81,7 @@ public interface BriarIntegrationTestComponent {
|
||||
|
||||
void inject(MessageEncoderParserIntegrationTest init);
|
||||
void inject(SessionEncoderParserIntegrationTest init);
|
||||
void inject(IntroductionCryptoImplTest init);
|
||||
|
||||
void inject(BlogModule.EagerSingletons init);
|
||||
|
||||
|
||||
Reference in New Issue
Block a user