Merge "Remove unused ChooserUtil.java" into tm-dev

/*

 * Copyright (C) 2020 The Android Open Source Project

 *

 * 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 com.android.internal.app;

import java.nio.charset.Charset;

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

/**

 * Utility method for common computation operations for Share sheet.

 */

public class ChooserUtil {

    private static final Charset UTF_8 = Charset.forName("UTF-8");

    /**

     * Hashes the given input based on MD5 algorithm.

     *

     * @return a string representation of the hash computation.

     */

    public static String md5(String input) {

        try {

            MessageDigest md = MessageDigest.getInstance("MD5");

            md.update(input.getBytes(UTF_8));

            return convertBytesToHexString(md.digest());

        } catch (NoSuchAlgorithmException e) {

            throw new IllegalStateException(e);

        }

    }

    /** Converts byte array input into an hex string. */

    private static String convertBytesToHexString(byte[] input) {

        char[] chars = new char[input.length * 2];

        for (int i = 0; i < input.length; i++) {

            byte b = input[i];

            chars[i * 2] = Character.forDigit((b >> 4) & 0xF, 16 /* radix */);

            chars[i * 2 + 1] = Character.forDigit(b & 0xF, 16 /* radix */);

        }

        return new String(chars);

    }

    private ChooserUtil() {}

}