| 1 | // Copyright 2013 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | package org.chromium.chrome.browser.util; |
| 6 | |
| 7 | import android.util.Log; |
| 8 | |
| 9 | import java.security.MessageDigest; |
| 10 | import java.security.NoSuchAlgorithmException; |
| 11 | import java.util.Formatter; |
| 12 | |
| 13 | import javax.annotation.Nullable; |
| 14 | |
| 15 | /** |
| 16 | * Helper functions for working with hashes. |
| 17 | */ |
| 18 | public final class HashUtil { |
| 19 | private static final String TAG = "HashUtil"; |
| 20 | |
| 21 | private HashUtil() { |
| 22 | } |
| 23 | |
| 24 | public static class Params { |
| 25 | private final String mText; |
| 26 | private String mSalt; |
| 27 | |
| 28 | public Params(String text) { |
| 29 | mText = text; |
| 30 | } |
| 31 | |
| 32 | public Params withSalt(String salt) { |
| 33 | mSalt = salt; |
| 34 | return this; |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | public static String getMd5Hash(Params params) { |
| 39 | return getHash(params, "MD5"); |
| 40 | } |
| 41 | |
| 42 | private static String getHash(Params params, String algorithm) { |
| 43 | try { |
| 44 | String digestText = params.mText + (params.mSalt == null ? "" : params.mSalt); |
| 45 | MessageDigest m = MessageDigest.getInstance(algorithm); |
| 46 | byte[] digest = m.digest(digestText.getBytes()); |
| 47 | return encodeHex(digest); |
| 48 | } catch (NoSuchAlgorithmException e) { |
| 49 | Log.e(TAG, "Unable to find digest algorithm " + algorithm); |
| 50 | return null; |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | private static String encodeHex(byte[] data) { |
| 55 | StringBuilder sb = new StringBuilder(data.length * 2); |
| 56 | Formatter formatter = new Formatter(sb); |
| 57 | for (byte b : data) { |
| 58 | formatter.format("%02x", b); |
| 59 | } |
| 60 | return sb.toString(); |
| 61 | } |
| 62 | } |