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/*
* 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/SafeByteArray.h>
#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);
}
};
}
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