50 lines
1.4 KiB
Java
50 lines
1.4 KiB
Java
/*
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* Copyright (c) 2015-present, Parse, LLC.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*/
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package com.parse;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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/**
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* Static utility helpers to compute {@link MessageDigest}s.
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*/
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/* package */ class ParseDigestUtils {
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private static final char[] hexArray = "0123456789abcdef".toCharArray();
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private ParseDigestUtils() {
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// no instances allowed
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}
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public static String md5(String string) {
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MessageDigest digester;
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try {
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digester = MessageDigest.getInstance("MD5");
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} catch (NoSuchAlgorithmException e) {
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throw new RuntimeException(e);
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}
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digester.update(string.getBytes());
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byte[] digest = digester.digest();
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return toHex(digest);
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}
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private static String toHex(byte[] bytes) {
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// The returned string will be double the length of the passed array, as it takes two
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// characters to represent any given byte.
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char[] hexChars = new char[bytes.length * 2];
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for ( int j = 0; j < bytes.length; j++ ) {
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int v = bytes[j] & 0xFF;
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hexChars[j * 2] = hexArray[v >>> 4];
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hexChars[j * 2 + 1] = hexArray[v & 0x0F];
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}
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return new String(hexChars);
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}
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}
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