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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.
*/
#include "Swiften/StringCodecs/HMACSHA1.h"
#include <cassert>
#include "Swiften/StringCodecs/SHA1.h"
#include "Swiften/Base/ByteArray.h"
namespace Swift {
static const unsigned int B = 64;
ByteArray HMACSHA1::getResult(const ByteArray& key, const ByteArray& data) {
assert(key.getSize() <= B);
// Create the padded key
ByteArray paddedKey(key);
paddedKey.resize(B);
for (unsigned int i = key.getSize(); i < paddedKey.getSize(); ++i) {
paddedKey[i] = 0x0;
}
// Create the first value
ByteArray x(paddedKey);
for (unsigned int i = 0; i < x.getSize(); ++i) {
x[i] ^= 0x36;
}
x += data;
// Create the second value
ByteArray y(paddedKey);
for (unsigned int i = 0; i < y.getSize(); ++i) {
y[i] ^= 0x5c;
}
y += SHA1::getHash(x);
return SHA1::getHash(y);
}
}
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Swift