| /* |
| * 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() {} |
| } |