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diff --git a/org.argeo.util/src/org/argeo/util/security/KeyringLoginModule.java b/org.argeo.util/src/org/argeo/util/security/KeyringLoginModule.java
new file mode 100644
index 000000000..11a834c25
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+++ b/org.argeo.util/src/org/argeo/util/security/KeyringLoginModule.java
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2007-2012 Argeo GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *         http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.argeo.util.security;
+
+import java.security.AccessController;
+import java.util.Map;
+import java.util.Set;
+
+import javax.crypto.SecretKey;
+import javax.crypto.SecretKeyFactory;
+import javax.crypto.spec.PBEKeySpec;
+import javax.crypto.spec.SecretKeySpec;
+import javax.security.auth.Subject;
+import javax.security.auth.callback.Callback;
+import javax.security.auth.callback.CallbackHandler;
+import javax.security.auth.callback.PasswordCallback;
+import javax.security.auth.login.LoginException;
+import javax.security.auth.spi.LoginModule;
+
+/** Adds a secret key to the private credentials */
+public class KeyringLoginModule implements LoginModule {
+	private Subject subject;
+	private CallbackHandler callbackHandler;
+	private SecretKey secretKey;
+
+	public void initialize(Subject subject, CallbackHandler callbackHandler,
+			Map<String, ?> sharedState, Map<String, ?> options) {
+		this.subject = subject;
+		if (subject == null) {
+			subject = Subject.getSubject(AccessController.getContext());
+		}
+		this.callbackHandler = callbackHandler;
+	}
+
+	public boolean login() throws LoginException {
+		Set<SecretKey> pbes = subject.getPrivateCredentials(SecretKey.class);
+		if (pbes.size() > 0)
+			return true;
+		PasswordCallback pc = new PasswordCallback("Master password", false);
+		PBEKeySpecCallback pbeCb = new PBEKeySpecCallback();
+		Callback[] callbacks = { pc, pbeCb };
+		try {
+			callbackHandler.handle(callbacks);
+			char[] password = pc.getPassword();
+
+			SecretKeyFactory keyFac = SecretKeyFactory.getInstance(pbeCb
+					.getSecretKeyFactory());
+			PBEKeySpec keySpec;
+			if (pbeCb.getKeyLength() != null)
+				keySpec = new PBEKeySpec(password, pbeCb.getSalt(),
+						pbeCb.getIterationCount(), pbeCb.getKeyLength());
+			else
+				keySpec = new PBEKeySpec(password, pbeCb.getSalt(),
+						pbeCb.getIterationCount());
+
+			String secKeyEncryption = pbeCb.getSecretKeyEncryption();
+			if (secKeyEncryption != null) {
+				SecretKey tmp = keyFac.generateSecret(keySpec);
+				secretKey = new SecretKeySpec(tmp.getEncoded(),
+						secKeyEncryption);
+			} else {
+				secretKey = keyFac.generateSecret(keySpec);
+			}
+		} catch (Exception e) {
+			LoginException le = new LoginException("Cannot login keyring");
+			le.initCause(e);
+			throw le;
+		}
+		return true;
+	}
+
+	public boolean commit() throws LoginException {
+		if (secretKey != null)
+			subject.getPrivateCredentials().add(secretKey);
+		return true;
+	}
+
+	public boolean abort() throws LoginException {
+		return true;
+	}
+
+	public boolean logout() throws LoginException {
+		Set<PasswordBasedEncryption> pbes = subject
+				.getPrivateCredentials(PasswordBasedEncryption.class);
+		pbes.clear();
+		return true;
+	}
+
+}