104 lines
3.0 KiB
Java
104 lines
3.0 KiB
Java
/*
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* Copyright 2001-2011 Joel Hockey (joel.hockey@gmail.com). All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package ru.serega6531.packmate.utils;
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import java.security.MessageDigest;
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/**
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* https://github.com/joelhockey/tls/blob/master/src/main/java/net/java/jless/tls/HMAC.java
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*/
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public class HMAC {
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private byte[] k_ipad = new byte[64];
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private byte[] k_opad = new byte[64];
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MessageDigest md = null;
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/**
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* Class constructor specifying the MessageDigest and secret to use
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*
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* @param md the MessageDigest (MD5 or SHA1).
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* @param key the secret to seed the md.
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*/
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public HMAC(MessageDigest md, byte[] key) {
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setMD(md);
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setKey(key);
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}
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/**
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* Set the MessageDigest for HMAC
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*
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* @param md the MessageDigest
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*/
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public void setMD(MessageDigest md) {
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this.md = md;
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}
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/**
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* Set the secret key for HMAC
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*
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* @param key the key.
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*/
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public void setKey(byte[] key) {
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int keyLength = 0;
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// get keyLength.
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if (key == null) {
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keyLength = 0;
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} else {
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keyLength = key.length;
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}
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// if the key is longer than 64 bytes then hash it.
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byte[] tempKey = keyLength > 64 ? md.digest(key) : key;
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// get m_k_ipad and m_k_opad
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for (int i = 0; i < keyLength; i++) {
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k_ipad[i] = (byte) (0x36 ^ tempKey[i]);
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k_opad[i] = (byte) (0x5C ^ tempKey[i]);
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}
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for (int i = keyLength; i < 64; i++) {
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k_ipad[i] = 0x36;
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k_opad[i] = 0x5C;
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}
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}
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/**
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* Digest the HMAC
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*
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* @param input the byte array input
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* @return HMAC value
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*/
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public byte[] digest(byte[] input) {
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md.reset();
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md.update(k_ipad);
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md.update(input);
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byte[] inner = md.digest();
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md.update(k_opad);
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md.update(inner);
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return md.digest();
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}
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}
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