From 354bb40e75d94466e91fe6960523612c9d17ccfb Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Thu, 2 Nov 2017 23:11:29 +0300
Subject: Add implementation

---
 mysql/extra/yassl/taocrypt/include/hmac.hpp | 138 ++++++++++++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 mysql/extra/yassl/taocrypt/include/hmac.hpp

(limited to 'mysql/extra/yassl/taocrypt/include/hmac.hpp')

diff --git a/mysql/extra/yassl/taocrypt/include/hmac.hpp b/mysql/extra/yassl/taocrypt/include/hmac.hpp
new file mode 100644
index 0000000..4df081b
--- /dev/null
+++ b/mysql/extra/yassl/taocrypt/include/hmac.hpp
@@ -0,0 +1,138 @@
+/*
+   Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; version 2 of the License.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; see the file COPYING. If not, write to the
+   Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
+   MA  02110-1301  USA.
+*/
+
+/* hamc.hpp implements HMAC, see RFC 2104
+*/
+
+
+#ifndef TAO_CRYPT_HMAC_HPP
+#define TAO_CRYPT_HMAC_HPP
+
+#include "hash.hpp"
+
+namespace TaoCrypt {
+
+
+// HMAC class template
+template <class T>
+class HMAC {
+public:
+    enum { IPAD = 0x36, OPAD = 0x5C };
+
+    HMAC() : ipad_(reinterpret_cast<byte*>(&ip_)), 
+             opad_(reinterpret_cast<byte*>(&op_)),
+             innerHash_(reinterpret_cast<byte*>(&innerH_)) 
+    { 
+        Init(); 
+    }
+    void Update(const byte*, word32);
+    void Final(byte*);
+    void Init();
+
+    void SetKey(const byte*, word32);
+private:
+    byte* ipad_;
+    byte* opad_;
+    byte* innerHash_;
+    bool  innerHashKeyed_;
+    T     mac_;
+
+    // MSVC 6 HACK, gives compiler error if calculated in array
+    enum { HMAC_BSIZE = T::BLOCK_SIZE  / sizeof(word32),
+           HMAC_DSIZE = T::DIGEST_SIZE / sizeof(word32) };
+
+    word32 ip_[HMAC_BSIZE];          // align ipad_ on word32
+    word32 op_[HMAC_BSIZE];          // align opad_ on word32
+    word32 innerH_[HMAC_DSIZE];      // align innerHash_ on word32
+
+    void KeyInnerHash();
+
+    HMAC(const HMAC&);
+    HMAC& operator= (const HMAC&);
+};
+
+
+// Setup
+template <class T>
+void HMAC<T>::Init()
+{
+    mac_.Init();
+    innerHashKeyed_ = false;
+}
+
+
+// Key generation
+template <class T>
+void HMAC<T>::SetKey(const byte* key, word32 length)
+{
+    Init();
+
+    if (length <= T::BLOCK_SIZE)
+        memcpy(ipad_, key, length);
+    else {
+        mac_.Update(key, length);
+        mac_.Final(ipad_);
+        length = T::DIGEST_SIZE;
+    }
+    memset(ipad_ + length, 0, T::BLOCK_SIZE - length);
+
+    for (word32 i = 0; i < T::BLOCK_SIZE; i++) {
+        opad_[i] = ipad_[i] ^ OPAD;
+        ipad_[i] ^= IPAD;
+    }
+}
+
+
+// Inner Key Hash
+template <class T>
+void HMAC<T>::KeyInnerHash()
+{
+    mac_.Update(ipad_, T::BLOCK_SIZE);
+    innerHashKeyed_ = true;
+}
+
+
+// Update
+template <class T>
+void HMAC<T>::Update(const byte* msg, word32 length)
+{
+    if (!innerHashKeyed_)
+        KeyInnerHash();
+    mac_.Update(msg, length);
+}
+
+
+// Final
+template <class T>
+void HMAC<T>::Final(byte* hash)
+{
+    if (!innerHashKeyed_)
+        KeyInnerHash();
+    mac_.Final(innerHash_);
+
+    mac_.Update(opad_, T::BLOCK_SIZE);
+    mac_.Update(innerHash_, T::DIGEST_SIZE);
+    mac_.Final(hash);
+
+    innerHashKeyed_ = false;
+}
+
+
+} // namespace
+
+#endif // TAO_CRYPT_HMAC_HPP
-- 
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