Remove ShaPasswordEncoder from core

Issue: gh-4674

core/src/main/java/org/springframework/security/authentication/encoding/ShaPasswordEncoder.java

@@ -1,63 +0,0 @@
-/*
- * Copyright 2004, 2005, 2006 Acegi Technology Pty Limited
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package org.springframework.security.authentication.encoding;
-
-/**
- * <p>
- * SHA implementation of PasswordEncoder.
- * </p>
- * <p>
- * If a <code>null</code> password is presented, it will be treated as an empty
- * <code>String</code> ("") password.
- * </p>
- * <p>
- * As SHA is a one-way hash, the salt can contain any characters. The default strength for
- * the SHA encoding is SHA-1. If you wish to use higher strengths use the parametrised
- * constructor. {@link #ShaPasswordEncoder(int strength)}
- * </p>
- * <p>
- * The applicationContext example...
- *
- * <pre>
- * &lt;bean id="passwordEncoder" class="org.springframework.security.authentication.encoding.ShaPasswordEncoder"&gt;
- *     &lt;constructor-arg value="256"/&gt;
- * &lt;/bean&gt;
- * </pre>
- *
- * @author Ray Krueger
- * @author colin sampaleanu
- * @author Ben Alex
- */
-public class ShaPasswordEncoder extends MessageDigestPasswordEncoder {
-
-	/**
-	 * Initializes the ShaPasswordEncoder for SHA-1 strength
-	 */
-	public ShaPasswordEncoder() {
-		this(1);
-	}
-
-	/**
-	 * Initialize the ShaPasswordEncoder with a given SHA stength as supported by the JVM
-	 * EX: <code>ShaPasswordEncoder encoder = new ShaPasswordEncoder(256);</code>
-	 * initializes with SHA-256
-	 *
-	 * @param strength EX: 1, 256, 384, 512
-	 */
-	public ShaPasswordEncoder(int strength) {
-		super("SHA-" + strength);
-	}
-}