Migrated BAEL-7190 to a new module (#16518)

* BAEL-7190 implementation

* Migrated BAEL-7190 to a new module

* Revert "BAEL-7190 implementation"

This reverts commit dd947aefda7b12a0eb06030b5d89f2ada77834a5.

core-java-modules/core-java-security-4/src/main/java/com/baeldung/unrecoverablekeyexception/KeyManagerInitializer.java

@@ -0,0 +1,32 @@
+package com.baeldung.unrecoverablekeyexception;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URISyntaxException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.security.KeyStore;
+import java.security.KeyStoreException;
+import java.security.NoSuchAlgorithmException;
+import java.security.UnrecoverableKeyException;
+import java.security.cert.CertificateException;
+import javax.net.ssl.KeyManagerFactory;
+import javax.net.ssl.X509ExtendedKeyManager;
+
+public class KeyManagerInitializer {
+
+  public static X509ExtendedKeyManager initializeKeyManager(String privateKeyPassword, String keystoreLocation)
+      throws NoSuchAlgorithmException, KeyStoreException, IOException, CertificateException, UnrecoverableKeyException, URISyntaxException {
+    KeyManagerFactory kmf = KeyManagerFactory.getInstance(KeyManagerFactory.getDefaultAlgorithm());
+    KeyStore instance = KeyStore.getInstance(KeyStore.getDefaultType());
+    InputStream resourceAsStream = Files.newInputStream(Paths.get(ClassLoader.getSystemResource(keystoreLocation).toURI()));
+    instance.load(resourceAsStream, "admin123".toCharArray());
+    kmf.init(instance, privateKeyPassword.toCharArray());
+    return (X509ExtendedKeyManager) kmf.getKeyManagers()[0];
+  }
+
+  public static X509ExtendedKeyManager initializeKeyManager(String privateKeyPassword)
+      throws NoSuchAlgorithmException, KeyStoreException, IOException, CertificateException, UnrecoverableKeyException, URISyntaxException {
+    return initializeKeyManager(privateKeyPassword, "single_entry_keystore.jks");
+  }
+}

core-java-modules/core-java-security-4/src/test/java/com/baeldung/unrecoverablekeyexception/KeyManagerInitializerUnitTest.java

@@ -0,0 +1,45 @@
+package com.baeldung.unrecoverablekeyexception;
+
+import java.security.UnrecoverableKeyException;
+import org.assertj.core.api.Assertions;
+import org.assertj.core.api.ThrowableAssert.ThrowingCallable;
+import org.junit.Test;
+
+public class KeyManagerInitializerUnitTest {
+
+  @Test
+  public void givenPasswordIsCorrect_whenInitializingTheKeyManager_thenNoExceptionIsThrown() {
+    // Given.
+    String privateKeyPassword = "privateKeyPassword";
+
+    // When.
+    ThrowingCallable initializeKeyManager = () -> KeyManagerInitializer.initializeKeyManager(privateKeyPassword);
+
+    // Then.
+    Assertions.assertThatCode(initializeKeyManager).doesNotThrowAnyException();;
+  }
+
+  @Test
+  public void givenPasswordIsWrong_whenInitializingTheKeyManager_thenUnrecoverableKeyExceptionExceptionIsThrown() {
+    // Given.
+    String privateKeyPassword = "wrongPassword";
+
+    // When.
+    ThrowingCallable initializeKeyManager = () -> KeyManagerInitializer.initializeKeyManager(privateKeyPassword);
+
+    // Then.
+    Assertions.assertThatThrownBy(initializeKeyManager).isInstanceOf(UnrecoverableKeyException.class);
+  }
+
+  @Test
+  public void givenMultipleKeysWithDifferentPasswordsInKeystore_whenInitializingTheKeyManager_thenUnrecoverableKeyExceptionIsThrown() {
+    // Given.
+    String firstPrivateKeyPassword = "abc123";
+
+    // When.
+    ThrowingCallable initializeKeyManager = () -> KeyManagerInitializer.initializeKeyManager(firstPrivateKeyPassword, "multi_entry_keystore.jks");
+
+    // Then.
+    Assertions.assertThatThrownBy(initializeKeyManager).isInstanceOf(UnrecoverableKeyException.class);
+  }
+}