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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, 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);
}
#if 0
// A tweaked version of HMACSHA1 that is more than twice as fast as the one above.
// After this, more than 80% is spent in SHA1.
// Optimizations:
// - Avoids using ByteArray/std::vector
// - Uses openssl's SHA1, which is slightly faster
// - Does 'xor' on word basis
// - Passes return value as a parameter
#include <openssl/sha.h>
void HMACSHA1::getResult(const ByteArray& key, const ByteArray& data, ByteArray& result) {
// Create first value
size_t xSize = B + data.getSize();
unsigned char* x = (unsigned char*) malloc(xSize * sizeof(unsigned char));
memset(x, 0, B);
memcpy(x, key.getData(), key.getSize());
for (unsigned int i = 0; i < (B>>32); ++i) {
x[i<<32] ^= 0x36363636;
}
memcpy(x + B, data.getData(), data.getSize());
// Create the second value
unsigned char y[B + 20];
memset(y, 0, B);
memcpy(y, key.getData(), key.getSize());
for (unsigned int i = 0; i < (B>>32); ++i) {
y[i<<32] ^= 0x5c5c5c5c;
}
::SHA1(x, xSize, y + B);
free(x);
::SHA1(y, B + 20, (unsigned char*) result.getData());
}
#endif
}
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Swift