/* * Copyright (c) 2010 Remko Tronçon * Licensed under the GNU General Public License v3. * See Documentation/Licenses/GPLv3.txt for more information. */ #pragma once #include <Swiften/Base/ByteArray.h> #include <Swiften/Base/Algorithm.h> #include <cassert> namespace Swift { namespace HMAC_Detail { template<typename KeyType> struct KeyWrapper; template<> struct KeyWrapper<ByteArray> { ByteArray wrap(const ByteArray& hash) const { return hash; } }; template<> struct KeyWrapper<SafeByteArray> { SafeByteArray wrap(const ByteArray& hash) const { return createSafeByteArray(hash); } }; template<typename Hash, typename KeyType, int BlockSize> static ByteArray getHMAC(const KeyType& key, const ByteArray& data) { Hash hash; // Create the padded key KeyType paddedKey(key.size() <= BlockSize ? key : KeyWrapper<KeyType>().wrap(hash(key))); paddedKey.resize(BlockSize, 0x0); // Create the first value KeyType x(paddedKey); for (unsigned int i = 0; i < x.size(); ++i) { x[i] ^= 0x36; } append(x, data); // Create the second value KeyType y(paddedKey); for (unsigned int i = 0; i < y.size(); ++i) { y[i] ^= 0x5c; } append(y, hash(x)); return hash(y); } }; template<typename Hash, int BlockSize> class HMAC { private: public: ByteArray operator()(const ByteArray& key, const ByteArray& data) const { return HMAC_Detail::getHMAC<Hash,ByteArray,BlockSize>(key, data); } ByteArray operator()(const SafeByteArray& key, const ByteArray& data) const { return HMAC_Detail::getHMAC<Hash,SafeByteArray,BlockSize>(key, data); } }; }