Добавлен PRF

src/main/java/ru/serega6531/packmate/utils/HMAC.java

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