Rename keyAlias parameter to alias

Rename the keyAlais parameter to alias since it may be used as either
the key alias or the certificate alias.

Also clarify the javadoc for keyPassword.

Closes gh-38099

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/ssl/pem/PemSslStoreBundle.java

@@ -41,7 +41,7 @@ import org.springframework.util.StringUtils;
  */
 public class PemSslStoreBundle implements SslStoreBundle {
 
-	private static final String DEFAULT_KEY_ALIAS = "ssl";
+	private static final String DEFAULT_ALIAS = "ssl";
 
 	private final KeyStore keyStore;
 
@@ -60,40 +60,39 @@ public class PemSslStoreBundle implements SslStoreBundle {
 	 * Create a new {@link PemSslStoreBundle} instance.
 	 * @param keyStoreDetails the key store details
 	 * @param trustStoreDetails the trust store details
-	 * @param keyAlias the key alias to use or {@code null} to use a default alias
+	 * @param alias the alias to use or {@code null} to use a default alias
 	 */
-	public PemSslStoreBundle(PemSslStoreDetails keyStoreDetails, PemSslStoreDetails trustStoreDetails,
-			String keyAlias) {
-		this(keyStoreDetails, trustStoreDetails, keyAlias, null);
+	public PemSslStoreBundle(PemSslStoreDetails keyStoreDetails, PemSslStoreDetails trustStoreDetails, String alias) {
+		this(keyStoreDetails, trustStoreDetails, alias, null);
 	}
 
 	/**
 	 * Create a new {@link PemSslStoreBundle} instance.
 	 * @param keyStoreDetails the key store details
 	 * @param trustStoreDetails the trust store details
-	 * @param keyAlias the key alias to use or {@code null} to use a default alias
-	 * @param keyPassword the password to use for the key
+	 * @param alias the alias to use or {@code null} to use a default alias
+	 * @param keyPassword the password to protect the key (if one is added)
 	 * @since 3.2.0
 	 */
-	public PemSslStoreBundle(PemSslStoreDetails keyStoreDetails, PemSslStoreDetails trustStoreDetails, String keyAlias,
+	public PemSslStoreBundle(PemSslStoreDetails keyStoreDetails, PemSslStoreDetails trustStoreDetails, String alias,
 			String keyPassword) {
-		this(keyStoreDetails, trustStoreDetails, keyAlias, keyPassword, false);
+		this(keyStoreDetails, trustStoreDetails, alias, keyPassword, false);
 	}
 
 	/**
 	 * Create a new {@link PemSslStoreBundle} instance.
 	 * @param keyStoreDetails the key store details
 	 * @param trustStoreDetails the trust store details
-	 * @param keyAlias the key alias to use or {@code null} to use a default alias
-	 * @param keyPassword the password to use for the key
+	 * @param alias the key alias to use or {@code null} to use a default alias
+	 * @param keyPassword the password to protect the key (if one is added)
 	 * @param verifyKeys whether to verify that the private key matches the public key
 	 * @since 3.2.0
 	 */
-	public PemSslStoreBundle(PemSslStoreDetails keyStoreDetails, PemSslStoreDetails trustStoreDetails, String keyAlias,
+	public PemSslStoreBundle(PemSslStoreDetails keyStoreDetails, PemSslStoreDetails trustStoreDetails, String alias,
 			String keyPassword, boolean verifyKeys) {
-		this.keyStore = createKeyStore("key", keyStoreDetails, (keyAlias != null) ? keyAlias : DEFAULT_KEY_ALIAS,
-				keyPassword, verifyKeys);
-		this.trustStore = createKeyStore("trust", trustStoreDetails, (keyAlias != null) ? keyAlias : DEFAULT_KEY_ALIAS,
+		this.keyStore = createKeyStore("key", keyStoreDetails, (alias != null) ? alias : DEFAULT_ALIAS, keyPassword,
+				verifyKeys);
+		this.trustStore = createKeyStore("trust", trustStoreDetails, (alias != null) ? alias : DEFAULT_ALIAS,
 				keyPassword, verifyKeys);
 	}
 
@@ -112,7 +111,7 @@ public class PemSslStoreBundle implements SslStoreBundle {
 		return this.trustStore;
 	}
 
-	private static KeyStore createKeyStore(String name, PemSslStoreDetails details, String keyAlias, String keyPassword,
+	private static KeyStore createKeyStore(String name, PemSslStoreDetails details, String alias, String keyPassword,
 			boolean verifyKeys) {
 		if (details == null || details.isEmpty()) {
 			return null;
@@ -126,10 +125,10 @@ public class PemSslStoreBundle implements SslStoreBundle {
 				if (verifyKeys) {
 					verifyKeys(privateKey, certificates);
 				}
-				addPrivateKey(store, privateKey, keyAlias, keyPassword, certificates);
+				addPrivateKey(store, privateKey, alias, keyPassword, certificates);
 			}
 			else {
-				addCertificates(store, certificates, keyAlias);
+				addCertificates(store, certificates, alias);
 			}
 			return store;
 		}