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Modify API
Add methods to decrypt messages Add lots of high quality documentation
This commit is contained in:
parent
2706f60744
commit
55b9c1ac2a
5 changed files with 234 additions and 22 deletions
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@ -31,9 +31,12 @@ import java.util.Set;
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import org.jivesoftware.smack.util.stringencoder.Base64;
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import org.jivesoftware.smackx.ox.OpenPgpMessage;
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import org.jivesoftware.smackx.ox.OpenPgpProvider;
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import org.jivesoftware.smackx.ox.element.CryptElement;
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import org.jivesoftware.smackx.ox.element.OpenPgpElement;
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import org.jivesoftware.smackx.ox.element.PubkeyElement;
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import org.jivesoftware.smackx.ox.element.PublicKeysListElement;
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import org.jivesoftware.smackx.ox.element.SignElement;
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import org.jivesoftware.smackx.ox.element.SigncryptElement;
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import org.jivesoftware.smackx.ox.exception.CorruptedOpenPgpKeyException;
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import name.neuhalfen.projects.crypto.bouncycastle.openpgp.BouncyGPG;
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@ -81,14 +84,14 @@ public class BouncyCastleOpenPgpProvider implements OpenPgpProvider {
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}
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@Override
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public void processPubkeyElement(PubkeyElement element, BareJid jid) throws CorruptedOpenPgpKeyException {
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public void processPubkeyElement(PubkeyElement element, BareJid owner) throws CorruptedOpenPgpKeyException {
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byte[] decoded = Base64.decode(element.getDataElement().getB64Data());
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try {
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InMemoryKeyring contactsKeyring = theirKeys.get(jid);
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InMemoryKeyring contactsKeyring = theirKeys.get(owner);
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if (contactsKeyring == null) {
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contactsKeyring = KeyringConfigs.forGpgExportedKeys(KeyringConfigCallbacks.withUnprotectedKeys());
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theirKeys.put(jid, contactsKeyring);
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theirKeys.put(owner, contactsKeyring);
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}
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contactsKeyring.addPublicKey(decoded);
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@ -98,12 +101,12 @@ public class BouncyCastleOpenPgpProvider implements OpenPgpProvider {
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}
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@Override
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public void processPublicKeysListElement(PublicKeysListElement listElement, BareJid from) throws Exception {
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public void processPublicKeysListElement(PublicKeysListElement listElement, BareJid owner) throws Exception {
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}
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@Override
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public OpenPgpElement signAndEncrypt(InputStream inputStream, Set<BareJid> recipients)
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public OpenPgpElement signAndEncrypt(SigncryptElement element, Set<BareJid> recipients)
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throws Exception {
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if (recipients.isEmpty()) {
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throw new IllegalArgumentException("Set of recipients must not be empty");
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@ -119,7 +122,7 @@ public class BouncyCastleOpenPgpProvider implements OpenPgpProvider {
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}
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}
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// Add our keys to encryption config
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// Add our public and secret keys to encryption config
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for (PGPPublicKeyRing p : ourKeys.getPublicKeyRings()) {
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encryptionConfig.addPublicKey(p.getPublicKey().getEncoded());
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}
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@ -134,6 +137,7 @@ public class BouncyCastleOpenPgpProvider implements OpenPgpProvider {
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}
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recipientUIDs[pos] = "xmpp:" + ourJid.toString();
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InputStream inputStream = element.toInputStream();
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ByteArrayOutputStream encryptedOut = new ByteArrayOutputStream();
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OutputStream encryptor = BouncyGPG.encryptToStream()
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@ -154,28 +158,109 @@ public class BouncyCastleOpenPgpProvider implements OpenPgpProvider {
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}
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@Override
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public OpenPgpElement sign(InputStream inputStream) throws Exception {
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public OpenPgpElement sign(SignElement element) throws Exception {
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InMemoryKeyring signingConfig = KeyringConfigs.forGpgExportedKeys(KeyringConfigCallbacks.withUnprotectedKeys());
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// Add our secret keys to signing config
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for (PGPSecretKeyRing s : ourKeys.getSecretKeyRings()) {
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signingConfig.addSecretKey(s.getSecretKey().getEncoded());
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}
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InputStream inputStream = element.toInputStream();
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// TODO: Implement
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return null;
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}
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@Override
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public OpenPgpElement encrypt(InputStream inputStream, Set<BareJid> recipients) throws Exception {
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public OpenPgpMessage verify(OpenPgpElement element, BareJid sender) throws Exception {
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// TODO: Implement
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return null;
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}
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@Override
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public OpenPgpMessage decrypt(OpenPgpElement element) throws Exception {
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InMemoryKeyring decryptionConfig = KeyringConfigs.forGpgExportedKeys(KeyringConfigCallbacks.withUnprotectedKeys());
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// Add our secret keys to decryption config
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for (PGPSecretKeyRing s : ourKeys.getSecretKeyRings()) {
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decryptionConfig.addSecretKey(s.getSecretKey().getEncoded());
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}
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ByteArrayInputStream encryptedIn = new ByteArrayInputStream(
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element.getEncryptedBase64MessageContent().getBytes(Charset.forName("UTF-8")));
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InputStream decrypted = BouncyGPG.decryptAndVerifyStream()
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.withConfig(decryptionConfig)
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.withKeySelectionStrategy(new XmppKeySelectionStrategy(new Date()))
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.andIgnoreSignatures()
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.fromEncryptedInputStream(encryptedIn);
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ByteArrayOutputStream decryptedOut = new ByteArrayOutputStream();
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Streams.pipeAll(decrypted, decryptedOut);
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return new OpenPgpMessage(OpenPgpMessage.State.crypt, new String(decryptedOut.toByteArray(), Charset.forName("UTF-8")));
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}
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@Override
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public OpenPgpElement encrypt(CryptElement element, Set<BareJid> recipients) throws Exception {
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if (recipients.isEmpty()) {
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throw new IllegalArgumentException("Set of recipients must not be empty");
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}
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InMemoryKeyring encryptionConfig = KeyringConfigs.forGpgExportedKeys(KeyringConfigCallbacks.withUnprotectedKeys());
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// Add all recipients public keys to encryption config
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for (BareJid recipient : recipients) {
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KeyringConfig c = theirKeys.get(recipient);
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for (PGPPublicKeyRing p : c.getPublicKeyRings()) {
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encryptionConfig.addPublicKey(p.getPublicKey().getEncoded());
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}
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}
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// Add our public keys to encryption config
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for (PGPPublicKeyRing p : ourKeys.getPublicKeyRings()) {
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encryptionConfig.addPublicKey(p.getPublicKey().getEncoded());
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}
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String[] recipientUIDs = new String[recipients.size() + 1];
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int pos = 0;
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for (BareJid b : recipients) {
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recipientUIDs[pos++] = "xmpp:" + b.toString();
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}
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recipientUIDs[pos] = "xmpp:" + ourJid.toString();
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InputStream inputStream = element.toInputStream();
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ByteArrayOutputStream encryptedOut = new ByteArrayOutputStream();
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OutputStream encryptor = BouncyGPG.encryptToStream()
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.withConfig(encryptionConfig)
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.withKeySelectionStrategy(new XmppKeySelectionStrategy(new Date()))
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.withOxAlgorithms()
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.toRecipients(recipientUIDs)
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.andDoNotSign()
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.binaryOutput()
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.andWriteTo(encryptedOut);
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Streams.pipeAll(inputStream, encryptor);
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encryptor.close();
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String base64 = Base64.encodeToString(encryptedOut.toByteArray());
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return new OpenPgpElement(base64);
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}
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@Override
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public OpenPgpMessage decryptAndVerify(OpenPgpElement element, BareJid sender) throws Exception {
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InMemoryKeyring decryptionConfig = KeyringConfigs.forGpgExportedKeys(KeyringConfigCallbacks.withUnprotectedKeys());
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// Add our keys to decryption config
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// for (PGPPublicKeyRing p : ourKeys.getPublicKeyRings()) {
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// decryptionConfig.addPublicKey(p.getPublicKey().getEncoded());
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// }
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// Add our secret keys to decryption config
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for (PGPSecretKeyRing s : ourKeys.getSecretKeyRings()) {
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decryptionConfig.addSecretKey(s.getSecretKey().getEncoded());
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}
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// Add their keys to decryption config
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// Add their public keys to decryption config
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for (PGPPublicKeyRing p : theirKeys.get(sender).getPublicKeyRings()) {
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decryptionConfig.addPublicKey(p.getPublicKey().getEncoded());
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}
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@ -193,7 +278,7 @@ public class BouncyCastleOpenPgpProvider implements OpenPgpProvider {
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Streams.pipeAll(decrypted, decryptedOut);
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return new OpenPgpMessage(new String(decryptedOut.toByteArray(), Charset.forName("UTF-8")));
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return new OpenPgpMessage(OpenPgpMessage.State.signcrypt, new String(decryptedOut.toByteArray(), Charset.forName("UTF-8")));
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}
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@Override
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@ -61,7 +61,7 @@ public class BouncyCastleOpenPgpProviderTest extends SmackTestSuite {
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Collections.<ExtensionElement>singletonList(
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new Message.Body("en", "How do you know I’m mad?")));
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OpenPgpElement encrypted = aliceProvider.signAndEncrypt(
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signcryptElement.toInputStream(),
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signcryptElement,
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Collections.singleton(cheshire));
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// Decrypt the message as the cheshire cat
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@ -39,7 +39,8 @@ public class OpenPgpMessage {
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private OpenPgpContentElement openPgpContentElement;
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public OpenPgpMessage(String content) {
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public OpenPgpMessage(State state, String content) {
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this.state = state;
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this.element = content;
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}
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@ -66,4 +67,9 @@ public class OpenPgpMessage {
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state = State.crypt;
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}
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}
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public State getState() throws IOException, XmlPullParserException {
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ensureOpenPgpContentElementSet();
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return state;
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}
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}
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@ -23,9 +23,28 @@ import org.jivesoftware.smackx.ox.element.SigncryptElement;
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import org.jxmpp.jid.BareJid;
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public interface OpenPgpMessageListener {
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/**
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* This method gets called whenever we received and successfully decrypted/verified an encrypted, signed message.
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*
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* @param from sender/signer of the message.
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* @param signcryptElement decrypted and verified {@link SigncryptElement}.
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*/
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void signcryptElementReceived(BareJid from, SigncryptElement signcryptElement);
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/**
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* This method gets called whenever we received and successfully verified a signed message.
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*
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* @param from sender/signer of the message.
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* @param signElement verified {@link SignElement}.
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*/
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void signElementReceived(BareJid from, SignElement signElement);
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/**
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* This method gets called whenever we received and successfully decrypted an encrypted message.
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*
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* @param from sender of the message.
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* @param cryptElement decrypted {@link CryptElement}.
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*/
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void cryptElementReceived(BareJid from, CryptElement cryptElement);
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}
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@ -16,31 +16,133 @@
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*/
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package org.jivesoftware.smackx.ox;
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import java.io.InputStream;
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import java.util.Set;
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import org.jivesoftware.smackx.ox.element.CryptElement;
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import org.jivesoftware.smackx.ox.element.OpenPgpElement;
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import org.jivesoftware.smackx.ox.element.PubkeyElement;
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import org.jivesoftware.smackx.ox.element.PublicKeysListElement;
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import org.jivesoftware.smackx.ox.element.SignElement;
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import org.jivesoftware.smackx.ox.element.SigncryptElement;
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import org.jivesoftware.smackx.ox.exception.CorruptedOpenPgpKeyException;
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import org.jxmpp.jid.BareJid;
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public interface OpenPgpProvider {
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/**
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* Sign and encrypt a {@link SigncryptElement} element for usage within the context of instant messaging.
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* The resulting {@link OpenPgpElement} contains a Base64 encoded, unarmored OpenPGP message,
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* which can be decrypted by each recipient, as well as by ourselves.
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* The message contains a signature made by our key.
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*
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* @see <a href="https://xmpp.org/extensions/xep-0373.html#signcrypt">XEP-0373 §3</a>
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* @see <a href="https://xmpp.org/extensions/xep-0374.html#openpgp-secured-im">XEP-0374 §2.1</a>
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* @param element {@link SigncryptElement} which contains the content of the message as plaintext.
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* @param recipients {@link Set} of {@link BareJid} of recipients.
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* @return encrypted {@link OpenPgpElement} which contains the encrypted, encoded message.
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* @throws Exception
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*/
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OpenPgpElement signAndEncrypt(SigncryptElement element, Set<BareJid> recipients) throws Exception;
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/**
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* Decrypt an incoming {@link OpenPgpElement} which must contain a {@link SigncryptElement} and verify
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* the signature made by the sender in the context of instant messaging.
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*
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* @see <a href="https://xmpp.org/extensions/xep-0374.html#openpgp-secured-im">XEP-0374 §2.1</a>
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* @param element {@link OpenPgpElement} which contains an encrypted and signed {@link SigncryptElement}.
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* @param sender {@link BareJid} of the user which sent the message. This is also the user who signed the message.
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* @return decrypted {@link OpenPgpMessage} which contains the decrypted {@link SigncryptElement}.
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* @throws Exception
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*/
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OpenPgpMessage decryptAndVerify(OpenPgpElement element, BareJid sender) throws Exception;
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OpenPgpElement signAndEncrypt(InputStream inputStream, Set<BareJid> recipients) throws Exception;
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/**
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* Sign a {@link SignElement} and pack it inside a {@link OpenPgpElement}.
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* The resulting {@link OpenPgpElement} contains the {@link SignElement} signed and base64 encoded.
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*
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* Note: DO NOT use this method in the context of instant messaging, as XEP-0374 forbids that.
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*
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* @see <a href="https://xmpp.org/extensions/xep-0373.html#exchange">XEP-0373 §3.1</a>
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* @see <a href="https://xmpp.org/extensions/xep-0374.html#openpgp-secured-im">XEP-0374 §2.1</a>
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* @param element {@link SignElement} which will be signed.
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* @return {@link OpenPgpElement} which contains the signed, Base64 encoded {@link SignElement}.
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* @throws Exception
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*/
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OpenPgpElement sign(SignElement element) throws Exception;
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OpenPgpElement sign(InputStream inputStream) throws Exception;
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/**
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* Verify the signature on an incoming {@link OpenPgpElement} which must contain a {@link SignElement}.
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*
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* Note: DO NOT use this method in the context of instant messaging, as XEP-0374 forbids that.
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*
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* @see <a href="https://xmpp.org/extensions/xep-0373.html#exchange">XEP-0373 §3.1</a>
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* @see <a href="https://xmpp.org/extensions/xep-0374.html#openpgp-secured-im">XEP-0374 §2.1</a>
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* @param element incoming {@link OpenPgpElement} which must contain a signed {@link SignElement}.
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* @param sender {@link BareJid} of the sender which also signed the message.
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* @return {@link OpenPgpMessage} which contains the decoded {@link SignElement}.
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* @throws Exception
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*/
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OpenPgpMessage verify(OpenPgpElement element, BareJid sender) throws Exception;
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OpenPgpElement encrypt(InputStream inputStream, Set<BareJid> recipients) throws Exception;
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/**
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* Encrypt a {@link CryptElement} and pack it inside a {@link OpenPgpElement}.
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* The resulting {@link OpenPgpElement} contains the encrypted and Base64 encoded {@link CryptElement}
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* which can be decrypted by all recipients, as well as by ourselves.
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*
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* Note: DO NOT use this method in the context of instant messaging, as XEP-0374 forbids that.
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*
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* @see <a href="https://xmpp.org/extensions/xep-0374.html#openpgp-secured-im">XEP-0374 §2.1</a>
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* @param element plaintext {@link CryptElement} which will be encrypted.
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* @param recipients {@link Set} of {@link BareJid} of recipients, which will be able to decrypt the message.
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* @return {@link OpenPgpElement} which contains the encrypted, Base64 encoded {@link CryptElement}.
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* @throws Exception
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*/
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OpenPgpElement encrypt(CryptElement element, Set<BareJid> recipients) throws Exception;
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/**
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* Decrypt an incoming {@link OpenPgpElement} which must contain a {@link CryptElement}.
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* The resulting {@link OpenPgpMessage} will contain the decrypted {@link CryptElement}.
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*
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* Note: DO NOT use this method in the context of instant messaging, as XEP-0374 forbids that.
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*
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* @see <a href="https://xmpp.org/extensions/xep-0374.html#openpgp-secured-im">XEP-0374 §2.1</a>
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* @param element {@link OpenPgpElement} which contains the encrypted {@link CryptElement}.
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* @return {@link OpenPgpMessage} which contains the decrypted {@link CryptElement}.
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* @throws Exception
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*/
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OpenPgpMessage decrypt(OpenPgpElement element) throws Exception;
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/**
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* Create a {@link PubkeyElement} which contains our exported OpenPGP public key.
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* The element can for example be published.
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*
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* @return {@link PubkeyElement} containing our public key.
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* @throws CorruptedOpenPgpKeyException if our public key can for some reason not be serialized.
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*/
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PubkeyElement createPubkeyElement() throws CorruptedOpenPgpKeyException;
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void processPubkeyElement(PubkeyElement element, BareJid from) throws CorruptedOpenPgpKeyException;
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/**
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* Process an incoming {@link PubkeyElement} of a contact or ourselves.
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* That typically includes importing/updating the key.
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*
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* @param element {@link PubkeyElement} which presumably contains the public key of the {@code owner}.
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* @param owner owner of the OpenPGP public key contained in the {@link PubkeyElement}.
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* @throws CorruptedOpenPgpKeyException if the key found in the {@link PubkeyElement}
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* can not be deserialized or imported.
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*/
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void processPubkeyElement(PubkeyElement element, BareJid owner) throws CorruptedOpenPgpKeyException;
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void processPublicKeysListElement(PublicKeysListElement listElement, BareJid from) throws Exception;
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/**
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* Process an incoming update to the OpenPGP metadata node.
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* That typically includes fetching announced keys of which we don't have a local copy yet,
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* as well as marking keys which are missing from the list as inactive.
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*
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* @param listElement {@link PublicKeysListElement} which contains a list of the keys of {@code owner}.
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* @param owner {@link BareJid} of the owner of the announced public keys.
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* @throws Exception
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*/
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void processPublicKeysListElement(PublicKeysListElement listElement, BareJid owner) throws Exception;
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/**
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* Return the OpenPGP v4-fingerprint of our key in hexadecimal upper case.
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