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73 lines
2.3 KiB
73 lines
2.3 KiB
/*
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* kbiffcrypt.cpp
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* Copyright (C) 2005 Michael Hendricks <michael@palmcluster.org>
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*
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* This file contains the implementation of the functions in
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* the KBiffCrypt namespace.
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*
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* $Id$
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*/
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#include "kbiffcrypt.h"
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#include <kmdcodec.h>
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#include <ntqcstring.h>
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TQString KBiffCrypt::hmac_md5(const TQString& text, const TQString& k)
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{
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// If the original key is too long, the new key will be a hash of
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// the original key. Then the new key might have NULL bytes in it,
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// so we can't use TQCString
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TQByteArray key = (TQByteArray)k.utf8();
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KMD5 context; // for calculating MD5 sums
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KMD5::Digest digest; // intermediate storage for MD5 sums
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// inner and outer padding (key XORd with ipad and opad, respectively)
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TQByteArray k_ipad(64);
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TQByteArray k_opad(64);
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// if key is longer than 64 bytes reset it to key=MD5(key)
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if (key.size() > 64) {
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// cast to a TQCString because we don't want to hash the
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// trailing NULL byte
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KMD5 tctx((TQCString)key);
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key.duplicate((char*)tctx.rawDigest(), 16);
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}
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/* the HMAC-MD5 transform looks like this:
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*
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* MD5(K XOR opad, MD5(K XOR ipad, text))
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*
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* where K is an n byte key
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* ipad is the byte 0x36 repeated 64 times
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* opad is the byte 0x5c repeated 64 times
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* text is the data being protected
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*/
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// XOR key with ipad and opad values, copying
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// the pad values after the key's end
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for (unsigned int i=0; i<64; i++) {
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if( i < key.size() ) {
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k_ipad[i] = key[i] ^ 0x36;
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k_opad[i] = key[i] ^ 0x5c;
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} else {
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k_ipad[i] = 0x36;
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k_opad[i] = 0x5c;
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}
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}
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// perform inner MD5
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context.reset(); // init context for 1st pass
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context.update(k_ipad); // start with inner pad
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context.update(text.utf8()); // then text of datagram
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context.rawDigest(digest); // finish up 1st pass
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// perform outer MD5
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context.reset(); // init context for 2nd pass
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context.update(k_opad); // start with outer pad
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context.update(digest, 16); // then results of 1st hash
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return context.hexDigest(); // finish up 2nd pass and return
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}
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