diff -r 643978a35f6e -r 94691d8e746f test/jdk/sun/security/util/ManifestDigester/LineBreaks.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/sun/security/util/ManifestDigester/LineBreaks.java	Thu Jul 18 08:53:06 2019 +0800
@@ -0,0 +1,142 @@
+/*
+ * Copyright (c) 2019, 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.
+ */
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.util.List;
+import java.util.ArrayList;
+import java.util.function.Function;
+import java.util.jar.Attributes;
+import java.util.jar.Manifest;
+import sun.security.util.ManifestDigester;
+
+import org.testng.annotations.DataProvider;
+import org.testng.annotations.Test;
+
+import static java.nio.charset.StandardCharsets.UTF_8;
+import static org.testng.Assert.*;
+
+/**
+ * @test
+ * @bug 8217375
+ * @modules java.base/sun.security.util
+ * @compile ../../tools/jarsigner/Utils.java
+ * @run testng LineBreaks
+ * @summary Verify {@code ManifestDigester} reads different line breaks well.
+ * The specifications state:
+ * <q><pre>newline: CR LF | LF | CR (not followed by LF)</pre></q>.
+ * This test does not verify that the digests are correct.
+ */
+public class LineBreaks {
+
+    static final String KEY = "Key";
+    static final String VALUE = "Value";
+    static final String SECTION = "Section";
+    static final String FOO = "Foo";
+    static final String BAR = "Bar";
+
+    static final String EXCEED_LINE_WIDTH_LIMIT = "x".repeat(71);
+
+    String breakAndContinue(String str, String lineBreak) {
+        // assert no multi-byte UTF-8 encoded characters in this test
+        assertEquals(str.getBytes(UTF_8).length, str.length());
+
+        int p = 1;
+        while (p + 71 < str.length()) {
+            p += 71;
+            str = str.substring(0, p) + lineBreak + " " + str.substring(p);
+            p += lineBreak.length() + 1;
+        }
+        return str;
+    }
+
+    byte[] createTestManifest(String lineBreak, boolean onlyMainAttrs,
+            String excess) throws IOException {
+        System.out.println("lineBreak = "
+                + Utils.escapeStringWithNumbers(lineBreak));
+        System.out.println("onlyMainAttrs = " + onlyMainAttrs);
+        String mf = "";
+        mf += breakAndContinue(
+                KEY + ": " + VALUE + excess, lineBreak) + lineBreak;
+        mf += lineBreak;
+        if (!onlyMainAttrs) {
+            mf += breakAndContinue(
+                    "Name: " + SECTION + excess, lineBreak) + lineBreak;
+            mf += breakAndContinue(
+                    FOO + ": " + BAR + excess, lineBreak) + lineBreak;
+            mf += lineBreak;
+        }
+        byte[] mfBytes = mf.getBytes(UTF_8);
+        Utils.echoManifest(mfBytes, "binary manifest");
+        return mfBytes;
+    }
+
+    @DataProvider(name = "parameters")
+    public static Object[][] parameters() {
+        List<Object[]> tests = new ArrayList<>();
+        for (String lineBreak : new String[] { "\n", "\r", "\r\n" }) {
+            for (boolean onlyMainAttrs : new boolean[] { false, true }) {
+                for (int numLbs = 0; numLbs < 3; numLbs++) {
+                    tests.add(new Object[]{ lineBreak, onlyMainAttrs, numLbs });
+                }
+            }
+        }
+        return tests.toArray(new Object[tests.size()][]);
+    }
+
+    @Test(dataProvider = "parameters")
+    public void test(String lineBreak, boolean onlyMainAttrs, int numLbs)
+            throws IOException {
+        String excess = EXCEED_LINE_WIDTH_LIMIT.repeat(numLbs);
+        byte[] mfBytes = createTestManifest(lineBreak, onlyMainAttrs, excess);
+
+        // self-test: make sure the manifest is valid and represents the
+        // values as expected before attempting to digest it
+        Manifest mf = new Manifest(new ByteArrayInputStream(mfBytes));
+        assertEquals(mf.getMainAttributes().getValue(KEY), VALUE + excess);
+        Attributes section = mf.getAttributes(SECTION + excess);
+        if (onlyMainAttrs) {
+            assertNull(section);
+        } else {
+            assertEquals(section.getValue(FOO), BAR + excess);
+        }
+
+        // verify that ManifestDigester has actually found the individual
+        // section if and only if it was present thereby also implying based
+        // on ManifestDigester implementation that the main attributes were
+        // found before
+        ManifestDigester md = new ManifestDigester(mfBytes);
+        assertTrue((md.get(SECTION + excess, false) != null) != onlyMainAttrs);
+    }
+
+    static List<Integer> stringToIntList(String string) {
+        byte[] bytes = string.getBytes(UTF_8);
+        List<Integer> list = new ArrayList<>();
+        for (int i = 0; i < bytes.length; i++) {
+            list.add((int) bytes[i]);
+        }
+        return list;
+    }
+
+}