--- a/jdk/src/java.base/share/classes/sun/security/pkcs12/PKCS12KeyStore.java	Mon Feb 06 08:03:33 2017 -0800
+++ b/jdk/src/java.base/share/classes/sun/security/pkcs12/PKCS12KeyStore.java	Mon Feb 06 17:28:33 2017 +0000
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2016, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -982,7 +982,7 @@
             new CertEntry((X509Certificate) cert, null, alias, AnyUsage,
                 attributes);
         certificateCount++;
-        entries.put(alias, certEntry);
+        entries.put(alias.toLowerCase(Locale.ENGLISH), certEntry);
 
         if (debug != null) {
             debug.println("Setting a trusted certificate at alias '" + alias +

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/sun/security/pkcs12/MixedcaseAlias.java	Mon Feb 06 17:28:33 2017 +0000
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/*
+ * @test
+ * @bug 8173956
+ * @summary KeyStore regression due to default keystore being changed to PKCS12
+ */
+
+import java.io.*;
+import java.security.KeyStore;
+import java.security.cert.Certificate;
+import java.security.cert.CertificateFactory;
+import java.security.cert.X509Certificate;
+
+/**
+ * Test that a PKCS12 keystore entry with mixed-case alias can be retrieved.
+ */
+public class MixedcaseAlias {
+    private static final String DIR = System.getProperty("test.src", ".");
+    private static final String CERT = DIR + "/trusted.pem";
+    private static final String ALIAS = "Mixed-case Alias";
+
+    public static void main(String[] ignored) throws Exception {
+        KeyStore keystore = KeyStore.getInstance("PKCS12");
+        keystore.load(null, null);
+
+        keystore.setCertificateEntry(ALIAS, loadCertificate(CERT));
+        KeyStore.Entry entry = keystore.getEntry(ALIAS, null);
+
+        if (entry == null) {
+            throw new Exception(
+                "Error retrieving keystore entry using a mixed-case alias");
+        }
+
+        System.out.println("OK");
+    }
+
+    private static Certificate loadCertificate(String certFile)
+            throws Exception {
+        X509Certificate cert = null;
+        try (FileInputStream certStream = new FileInputStream(certFile)) {
+            CertificateFactory factory =
+                CertificateFactory.getInstance("X.509");
+            return factory.generateCertificate(certStream);
+        }
+    }
+}