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751d00c47e
- Replace SawTooth copyright header with MySQL's - Bug#19209 Test 'rpl_openssl' hangs on Windows - Spurious "2013 Connection to server lost" errors fixed yaSSL doesn't close socket anymore, that is left to the application
90 lines
2.2 KiB
C++
90 lines
2.2 KiB
C++
/*
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Copyright (C) 2000-2007 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
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MA 02110-1301 USA.
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*/
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/* pwdbased.hpp defines PBKDF2 from PKCS #5
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*/
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#ifndef TAO_CRYPT_PWDBASED_HPP
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#define TAO_CRYPT_PWDBASED_HPP
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#include <string.h>
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#include "misc.hpp"
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#include "block.hpp"
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#include "hmac.hpp"
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namespace TaoCrypt {
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// From PKCS #5, T must be type suitable for HMAC<T>
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template <class T>
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class PBKDF2_HMAC {
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public:
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word32 MaxDerivedKeyLength() const { return 0xFFFFFFFFU;} // avoid overflow
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word32 DeriveKey(byte* derived, word32 dLen, const byte* pwd, word32 pLen,
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const byte* salt, word32 sLen, word32 iterations) const;
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};
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template <class T>
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word32 PBKDF2_HMAC<T>::DeriveKey(byte* derived, word32 dLen, const byte* pwd,
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word32 pLen, const byte* salt, word32 sLen,
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word32 iterations) const
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{
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assert(dLen <= MaxDerivedKeyLength());
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assert(iterations > 0);
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ByteBlock buffer(T::DIGEST_SIZE);
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HMAC<T> hmac;
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hmac.SetKey(pwd, pLen);
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word32 i = 1;
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while (dLen > 0) {
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hmac.Update(salt, sLen);
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word32 j;
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for (j = 0; j < 4; j++) {
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byte b = i >> ((3-j)*8);
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hmac.Update(&b, 1);
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}
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hmac.Final(buffer.get_buffer());
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word32 segmentLen = min(dLen, buffer.size());
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memcpy(derived, buffer.get_buffer(), segmentLen);
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for (j = 1; j < iterations; j++) {
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hmac.Update(buffer.get_buffer(), buffer.size());
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hmac.Final(buffer.get_buffer());
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xorbuf(derived, buffer.get_buffer(), segmentLen);
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}
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derived += segmentLen;
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dLen -= segmentLen;
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i++;
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}
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return iterations;
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}
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} // naemspace
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#endif // TAO_CRYPT_PWDBASED_HPP
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