Decouple BouncyCastle from JGit Core

Motivation: BouncyCastle serves as 'default' implementation of
the GPG Signer. If a client application does not use it there is no need
to pull in this dependency, especially since BouncyCastle is a large
library.

Move the classes depending on BouncyCastle to an OSGi fragment extending
the org.eclipse.jgit bundle. They are moved to a distinct internal
package in order to avoid split packages. This doesn't break public API
since these classes were already in an internal package before this
change.

Add a new feature org.eclipse.jgit.gpg.bc to enable installation. With
that users can now decide if they want to install it.

Attempts to sign a commit if org.eclipse.jgit.gpg.bc isn't available
will result in ServiceUnavailableException being thrown.

Bug: 559106
Change-Id: I42fd6c00002e17aa9a7be96ae434b538ea86ccf8
Also-by: Michael Dardis <git@md-5.net>
Signed-off-by: Michael Dardis <git@md-5.net>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
Signed-off-by: David Ostrovsky <david@ostrovsky.org>

19 files changed, 1032 insertions, 0 deletions

diff --git a/org.eclipse.jgit.gpg.bc.test/.classpath b/org.eclipse.jgit.gpg.bc.test/.classpath
new file mode 100644
index 0000000000..f08af0a4e9
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/.classpath
@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.8"/>
+	<classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins"/>
+	<classpathentry kind="src" path="tst">
+		<attributes>
+			<attribute name="test" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="output" path="bin"/>
+</classpath>
diff --git a/org.eclipse.jgit.gpg.bc.test/.gitignore b/org.eclipse.jgit.gpg.bc.test/.gitignore
new file mode 100644
index 0000000000..934e0e06ff
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/.gitignore
@@ -0,0 +1,2 @@
+/bin
+/target
diff --git a/org.eclipse.jgit.gpg.bc.test/.project b/org.eclipse.jgit.gpg.bc.test/.project
new file mode 100644
index 0000000000..9aac4a256d
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/.project
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>org.eclipse.jgit.gpg.bc.test</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.pde.ManifestBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+		<buildCommand>
+			<name>org.eclipse.pde.SchemaBuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.pde.PluginNature</nature>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>
diff --git a/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.core.resources.prefs b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.core.resources.prefs
new file mode 100644
index 0000000000..99f26c0203
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.core.resources.prefs
@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+encoding/<project>=UTF-8
diff --git a/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.core.runtime.prefs b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.core.runtime.prefs
new file mode 100644
index 0000000000..5a0ad22d2a
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.core.runtime.prefs
@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+line.separator=\n
diff --git a/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.jdt.core.prefs b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.jdt.core.prefs
new file mode 100644
index 0000000000..822846c4d0
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.jdt.core.prefs
@@ -0,0 +1,399 @@
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diff --git a/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.jdt.ui.prefs b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.jdt.ui.prefs
new file mode 100644
index 0000000000..fef3713825
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.jdt.ui.prefs
@@ -0,0 +1,66 @@
+eclipse.preferences.version=1
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+formatter_profile=_JGit Format
+formatter_settings_version=12
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+sp_cleanup.add_default_serial_version_id=true
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+sp_cleanup.qualify_static_member_accesses_through_subtypes_with_declaring_class=true
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diff --git a/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.mylyn.tasks.ui.prefs b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.mylyn.tasks.ui.prefs
new file mode 100644
index 0000000000..3dec4d97c7
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.mylyn.tasks.ui.prefs
@@ -0,0 +1,3 @@
+eclipse.preferences.version=1
+project.repository.kind=bugzilla
+project.repository.url=https\://bugs.eclipse.org/bugs
diff --git a/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.mylyn.team.ui.prefs b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.mylyn.team.ui.prefs
new file mode 100644
index 0000000000..ce7a0f0478
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.mylyn.team.ui.prefs
@@ -0,0 +1,2 @@
+commit.comment.template=${task.description} \n\nBug\: ${task.key}
+eclipse.preferences.version=1
diff --git a/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.pde.api.tools.prefs b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.pde.api.tools.prefs
new file mode 100644
index 0000000000..c0030ded71
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.pde.api.tools.prefs
@@ -0,0 +1,104 @@
+ANNOTATION_ELEMENT_TYPE_ADDED_FIELD=Error
+ANNOTATION_ELEMENT_TYPE_ADDED_METHOD_WITHOUT_DEFAULT_VALUE=Error
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+API_COMPONENT_ELEMENT_TYPE_REMOVED_API_TYPE=Error
+API_COMPONENT_ELEMENT_TYPE_REMOVED_REEXPORTED_API_TYPE=Error
+API_COMPONENT_ELEMENT_TYPE_REMOVED_REEXPORTED_TYPE=Error
+API_COMPONENT_ELEMENT_TYPE_REMOVED_TYPE=Error
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+TYPE_PARAMETER_ELEMENT_TYPE_ADDED_CLASS_BOUND=Error
+TYPE_PARAMETER_ELEMENT_TYPE_ADDED_INTERFACE_BOUND=Error
+TYPE_PARAMETER_ELEMENT_TYPE_CHANGED_CLASS_BOUND=Error
+TYPE_PARAMETER_ELEMENT_TYPE_CHANGED_INTERFACE_BOUND=Error
+TYPE_PARAMETER_ELEMENT_TYPE_REMOVED_CLASS_BOUND=Error
+TYPE_PARAMETER_ELEMENT_TYPE_REMOVED_INTERFACE_BOUND=Error
+UNUSED_PROBLEM_FILTERS=Warning
+automatically_removed_unused_problem_filters=false
+changed_execution_env=Error
+eclipse.preferences.version=1
+incompatible_api_component_version=Error
+incompatible_api_component_version_include_major_without_breaking_change=Disabled
+incompatible_api_component_version_include_minor_without_api_change=Disabled
+incompatible_api_component_version_report_major_without_breaking_change=Warning
+incompatible_api_component_version_report_minor_without_api_change=Ignore
+invalid_since_tag_version=Error
+malformed_since_tag=Error
+missing_since_tag=Error
+report_api_breakage_when_major_version_incremented=Disabled
+report_resolution_errors_api_component=Warning
diff --git a/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.pde.core.prefs b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.pde.core.prefs
new file mode 100644
index 0000000000..923c37fb8d
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.pde.core.prefs
@@ -0,0 +1,2 @@
+eclipse.preferences.version=1
+resolve.requirebundle=false
diff --git a/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.pde.prefs b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.pde.prefs
new file mode 100644
index 0000000000..2174e4fd5b
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/.settings/org.eclipse.pde.prefs
@@ -0,0 +1,34 @@
+compilers.f.unresolved-features=1
+compilers.f.unresolved-plugins=1
+compilers.incompatible-environment=1
+compilers.p.build=1
+compilers.p.build.bin.includes=1
+compilers.p.build.encodings=2
+compilers.p.build.java.compiler=2
+compilers.p.build.java.compliance=1
+compilers.p.build.missing.output=2
+compilers.p.build.output.library=1
+compilers.p.build.source.library=1
+compilers.p.build.src.includes=1
+compilers.p.deprecated=1
+compilers.p.discouraged-class=1
+compilers.p.internal=1
+compilers.p.missing-packages=2
+compilers.p.missing-version-export-package=2
+compilers.p.missing-version-import-package=2
+compilers.p.missing-version-require-bundle=2
+compilers.p.no-required-att=0
+compilers.p.no.automatic.module=1
+compilers.p.not-externalized-att=2
+compilers.p.service.component.without.lazyactivation=1
+compilers.p.unknown-attribute=1
+compilers.p.unknown-class=1
+compilers.p.unknown-element=1
+compilers.p.unknown-identifier=1
+compilers.p.unknown-resource=1
+compilers.p.unresolved-ex-points=0
+compilers.p.unresolved-import=0
+compilers.s.create-docs=false
+compilers.s.doc-folder=doc
+compilers.s.open-tags=1
+eclipse.preferences.version=1
diff --git a/org.eclipse.jgit.gpg.bc.test/BUILD b/org.eclipse.jgit.gpg.bc.test/BUILD
new file mode 100644
index 0000000000..1e3677d929
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/BUILD
@@ -0,0 +1,14 @@
+load(
+    "@com_googlesource_gerrit_bazlets//tools:junit.bzl",
+    "junit_tests",
+)
+
+junit_tests(
+    name = "bc",
+    srcs = glob(["tst/**/*.java"]),
+    tags = ["bc"],
+    deps = [
+        "//lib:junit",
+        "//org.eclipse.jgit.gpg.bc:gpg-bc",
+    ],
+)
diff --git a/org.eclipse.jgit.gpg.bc.test/META-INF/MANIFEST.MF b/org.eclipse.jgit.gpg.bc.test/META-INF/MANIFEST.MF
new file mode 100644
index 0000000000..3eb0e04bfa
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/META-INF/MANIFEST.MF
@@ -0,0 +1,14 @@
+Manifest-Version: 1.0
+Bundle-ManifestVersion: 2
+Bundle-Name: %Bundle-Name
+Automatic-Module-Name: org.eclipse.jgit.gpg.bc.test
+Bundle-SymbolicName: org.eclipse.jgit.gpg.bc.test
+Bundle-Version: 5.8.0.qualifier
+Bundle-Vendor: %Bundle-Vendor
+Bundle-Localization: plugin
+Bundle-RequiredExecutionEnvironment: JavaSE-1.8
+Import-Package: org.eclipse.jgit.gpg.bc.internal;version="[5.8.0,5.9.0)",
+ org.junit;version="[4.13,5.0.0)"
+Export-Package: org.eclipse.jgit.gpg.bc.internal;x-internal:=true
+Require-Bundle: org.hamcrest.core;bundle-version="[1.1.0,2.0.0)",
+ org.hamcrest.library;bundle-version="[1.1.0,2.0.0)"
diff --git a/org.eclipse.jgit.gpg.bc.test/about.html b/org.eclipse.jgit.gpg.bc.test/about.html
new file mode 100644
index 0000000000..f971af18d0
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/about.html
@@ -0,0 +1,96 @@
+<?xml version="1.0" encoding="ISO-8859-1" ?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
+<title>Eclipse Distribution License - Version 1.0</title>
+<style type="text/css">
+  body {
+    size: 8.5in 11.0in;
+    margin: 0.25in 0.5in 0.25in 0.5in;
+    tab-interval: 0.5in;
+    }
+  p {  	
+    margin-left: auto;
+    margin-top:  0.5em;
+    margin-bottom: 0.5em;
+    }
+  p.list {
+  	margin-left: 0.5in;
+    margin-top:  0.05em;
+    margin-bottom: 0.05em;
+    }
+  .ubc-name {
+    margin-left: 0.5in;
+    white-space: pre;
+  }
+  </style>
+
+</head>
+
+<body lang="EN-US">
+
+<p><b>Eclipse Distribution License - v 1.0</b></p>
+
+<p>Copyright (c) 2007, Eclipse Foundation, Inc. and its licensors. </p>
+
+<p>All rights reserved.</p>
+<p>Redistribution and use in source and binary forms, with or without modification, 
+	are permitted provided that the following conditions are met:
+<ul><li>Redistributions of source code must retain the above copyright notice, 
+	this list of conditions and the following disclaimer. </li>
+<li>Redistributions in binary form must reproduce the above copyright notice, 
+	this list of conditions and the following disclaimer in the documentation 
+	and/or other materials provided with the distribution. </li>
+<li>Neither the name of the Eclipse Foundation, Inc. nor the names of its 
+	contributors may be used to endorse or promote products derived from 
+	this software without specific prior written permission. </li></ul>
+</p>
+<p>THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
+IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
+INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
+POSSIBILITY OF SUCH DAMAGE.</p>
+
+<hr>
+<p><b>SHA-1 UbcCheck - MIT</b></p>
+
+<p>Copyright (c) 2017:</p>
+<div class="ubc-name">
+Marc Stevens
+Cryptology Group
+Centrum Wiskunde & Informatica
+P.O. Box 94079, 1090 GB Amsterdam, Netherlands
+marc@marc-stevens.nl
+</div>
+<div class="ubc-name">
+Dan Shumow
+Microsoft Research
+danshu@microsoft.com
+</div>
+<p>Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+</p>
+<ul><li>The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.</li></ul>
+<p>THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.</p>
+
+</body>
+
+</html>
diff --git a/org.eclipse.jgit.gpg.bc.test/build.properties b/org.eclipse.jgit.gpg.bc.test/build.properties
new file mode 100644
index 0000000000..9ffa0caf78
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/build.properties
@@ -0,0 +1,5 @@
+source.. = tst/
+output.. = bin/
+bin.includes = META-INF/,\
+               .,\
+               plugin.properties
diff --git a/org.eclipse.jgit.gpg.bc.test/plugin.properties b/org.eclipse.jgit.gpg.bc.test/plugin.properties
new file mode 100644
index 0000000000..43776620c4
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/plugin.properties
@@ -0,0 +1,2 @@
+Bundle-Name=JGit Tests for GPG with bouncycastle
+Bundle-Vendor=Eclipse JGit
diff --git a/org.eclipse.jgit.gpg.bc.test/pom.xml b/org.eclipse.jgit.gpg.bc.test/pom.xml
new file mode 100644
index 0000000000..05c496b268
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/pom.xml
@@ -0,0 +1,112 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Copyright (C) 2018, Thomas Wolf <thomas.wolf@paranor.ch> and others
+
+  This program and the accompanying materials are made available under the
+  terms of the Eclipse Distribution License v. 1.0 which is available at
+  http://www.eclipse.org/org/documents/edl-v10.php.
+
+  SPDX-License-Identifier: BSD-3-Clause
+-->
+
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>org.eclipse.jgit</groupId>
+    <artifactId>org.eclipse.jgit-parent</artifactId>
+    <version>5.8.0-SNAPSHOT</version>
+  </parent>
+
+  <artifactId>org.eclipse.jgit.gpg.bc.test</artifactId>
+  <name>JGit - BouncyCastle GPG Tests</name>
+
+  <description>
+    JUnit tests for the JGit GPG support based on BouncyCastle.
+  </description>
+
+  <properties>
+    <maven.javadoc.skip>true</maven.javadoc.skip>
+  </properties>
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+    </dependency>
+
+    <dependency>
+      <groupId>org.eclipse.jgit</groupId>
+      <artifactId>org.eclipse.jgit</artifactId>
+      <version>${project.version}</version>
+    </dependency>
+
+    <dependency>
+      <groupId>org.eclipse.jgit</groupId>
+      <artifactId>org.eclipse.jgit.junit</artifactId>
+      <version>${project.version}</version>
+    </dependency>
+
+    <dependency>
+      <groupId>org.eclipse.jgit</groupId>
+      <artifactId>org.eclipse.jgit.gpg.bc</artifactId>
+      <version>${project.version}</version>
+    </dependency>
+
+    <dependency>
+      <groupId>org.eclipse.jgit</groupId>
+      <artifactId>org.eclipse.jgit.test</artifactId>
+      <version>${project.version}</version>
+    </dependency>
+
+  </dependencies>
+
+  <profiles>
+    <!-- Profile provides a property which enables long running tests. -->
+    <profile>
+      <id>test.long</id>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-surefire-plugin</artifactId>
+            <configuration>
+              <argLine>@{argLine} -Djgit.test.long=true</argLine>
+            </configuration>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+  </profiles>
+
+  <build>
+    <sourceDirectory>src/</sourceDirectory>
+    <testSourceDirectory>tst/</testSourceDirectory>
+
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <executions>
+          <execution>
+            <goals>
+              <goal>test-jar</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+      <plugin>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <configuration>
+          <argLine>@{argLine} -Xmx1024m -Dfile.encoding=UTF-8 -Djava.io.tmpdir=${project.build.directory}</argLine>
+          <includes>
+            <include>**/*Test.java</include>
+            <include>**/*Tests.java</include>
+          </includes>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+</project>
diff --git a/org.eclipse.jgit.gpg.bc.test/tst/org/eclipse/jgit/gpg/bc/internal/BouncyCastleGpgKeyLocatorTest.java b/org.eclipse.jgit.gpg.bc.test/tst/org/eclipse/jgit/gpg/bc/internal/BouncyCastleGpgKeyLocatorTest.java
new file mode 100644
index 0000000000..744620163d
--- /dev/null
+++ b/org.eclipse.jgit.gpg.bc.test/tst/org/eclipse/jgit/gpg/bc/internal/BouncyCastleGpgKeyLocatorTest.java
@@ -0,0 +1,134 @@
+/*
+ * Copyright (C) 2019, Thomas Wolf <thomas.wolf@paranor.ch> and others
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Distribution License v. 1.0 which is available at
+ * https://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+package org.eclipse.jgit.gpg.bc.internal;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+import java.util.Locale;
+
+import org.junit.Test;
+
+public class BouncyCastleGpgKeyLocatorTest {
+
+	private static final String USER_ID = "Heinrich Heine <heinrichh@uni-duesseldorf.de>";
+
+	private static boolean match(String userId, String pattern) {
+		return BouncyCastleGpgKeyLocator.containsSigningKey(userId, pattern);
+	}
+
+	@Test
+	public void testFullMatch() throws Exception {
+		assertTrue(match(USER_ID,
+				"=Heinrich Heine <heinrichh@uni-duesseldorf.de>"));
+		assertFalse(match(USER_ID, "=Heinrich Heine"));
+		assertFalse(match(USER_ID, "= "));
+		assertFalse(match(USER_ID, "=heinrichh@uni-duesseldorf.de"));
+	}
+
+	@Test
+	public void testEmpty() throws Exception {
+		assertFalse(match(USER_ID, ""));
+		assertFalse(match(USER_ID, null));
+		assertFalse(match("", ""));
+		assertFalse(match(null, ""));
+		assertFalse(match(null, null));
+		assertFalse(match("", "something"));
+		assertFalse(match(null, "something"));
+	}
+
+	@Test
+	public void testFullEmail() throws Exception {
+		assertTrue(match(USER_ID, "<heinrichh@uni-duesseldorf.de>"));
+		assertTrue(match(USER_ID + " ", "<heinrichh@uni-duesseldorf.de>"));
+		assertFalse(match(USER_ID, "<>"));
+		assertFalse(match(USER_ID, "<h>"));
+		assertFalse(match(USER_ID, "<heinrichh>"));
+		assertFalse(match(USER_ID, "<uni-duesseldorf>"));
+		assertFalse(match(USER_ID, "<h@u>"));
+		assertFalse(match(USER_ID, "<HeinrichH@uni-duesseldorf.de>"));
+		assertFalse(match(USER_ID.substring(0, USER_ID.length() - 1),
+				"<heinrichh@uni-duesseldorf.de>"));
+		assertFalse(match("", "<>"));
+		assertFalse(match("", "<heinrichh@uni-duesseldorf.de>"));
+	}
+
+	@Test
+	public void testPartialEmail() throws Exception {
+		assertTrue(match(USER_ID, "@heinrichh@uni-duesseldorf.de"));
+		assertTrue(match(USER_ID, "@heinrichh"));
+		assertTrue(match(USER_ID, "@duesseldorf"));
+		assertTrue(match(USER_ID, "@uni-d"));
+		assertTrue(match(USER_ID, "@h"));
+		assertTrue(match(USER_ID, "@."));
+		assertTrue(match(USER_ID, "@h@u"));
+		assertFalse(match(USER_ID, "@ "));
+		assertFalse(match(USER_ID, "@"));
+		assertFalse(match(USER_ID, "@Heine"));
+		assertFalse(match(USER_ID, "@HeinrichH"));
+		assertFalse(match(USER_ID, "@Heinrich"));
+		assertFalse(match("", "@"));
+		assertFalse(match("", "@h"));
+	}
+
+	private void substringTests(String prefix) throws Exception {
+		assertTrue(match(USER_ID, prefix + "heinrichh@uni-duesseldorf.de"));
+		assertTrue(match(USER_ID, prefix + "heinrich"));
+		assertTrue(match(USER_ID, prefix + "HEIN"));
+		assertTrue(match(USER_ID, prefix + "Heine <"));
+		assertTrue(match(USER_ID, prefix + "UNI"));
+		assertTrue(match(USER_ID, prefix + "uni"));
+		assertTrue(match(USER_ID, prefix + "rich He"));
+		assertTrue(match(USER_ID, prefix + "h@u"));
+		assertTrue(match(USER_ID, prefix + USER_ID));
+		assertTrue(match(USER_ID, prefix + USER_ID.toUpperCase(Locale.ROOT)));
+		assertFalse(match(USER_ID, prefix + ""));
+		assertFalse(match(USER_ID, prefix + " "));
+		assertFalse(match(USER_ID, prefix + "yy"));
+		assertFalse(match("", prefix + ""));
+		assertFalse(match("", prefix + "uni"));
+	}
+
+	@Test
+	public void testSubstringPlain() throws Exception {
+		substringTests("");
+	}
+
+	@Test
+	public void testSubstringAsterisk() throws Exception {
+		substringTests("*");
+	}
+
+	@Test
+	public void testExplicitFingerprint() throws Exception {
+		assertFalse(match("John Fade <j.fade@example.com>", "0xfade"));
+		assertFalse(match("John Fade <0xfade@example.com>", "0xfade"));
+		assertFalse(match("", "0xfade"));
+	}
+
+	@Test
+	public void testImplicitFingerprint() throws Exception {
+		assertTrue(match("John Fade <j.fade@example.com>", "fade"));
+		assertTrue(match("John Fade <0xfade@example.com>", "fade"));
+		assertTrue(match("John Fade <j.fade@example.com>", "FADE"));
+		assertTrue(match("John Fade <0xfade@example.com>", "FADE"));
+	}
+
+	@Test
+	public void testZeroX() throws Exception {
+		assertTrue(match("John Fade <0xfade@example.com>", "0x"));
+		assertTrue(match("John Fade <0xfade@example.com>", "*0x"));
+		assertTrue(match("John Fade <0xfade@example.com>", "*0xfade"));
+		assertTrue(match("John Fade <0xfade@example.com>", "*0xFADE"));
+		assertTrue(match("John Fade <0xfade@example.com>", "@0xfade"));
+		assertFalse(match("John Fade <0xfade@example.com>", "@0xFADE"));
+		assertFalse(match("", "0x"));
+	}
+}