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182 lines
6.0 KiB
182 lines
6.0 KiB
// tlsh.h - TrendLSH Hash Algorithm
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/*
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* TLSH is provided for use under two licenses: Apache OR BSD.
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* Users may opt to use either license depending on the license
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* restictions of the systems with which they plan to integrate
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* the TLSH code.
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*/
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/* ==============
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* Apache License
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* ==============
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* Copyright 2013 Trend Micro Incorporated
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/* ===========
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* BSD License
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* ===========
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* Copyright (c) 2013, Trend Micro Incorporated
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holder nor the names of its contributors
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* may be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
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* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef HEADER_TLSH_H
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#define HEADER_TLSH_H
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#include "version.h"
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#ifndef NULL
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#define NULL 0
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#endif
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#ifdef __cplusplus
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class TlshImpl;
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#define BUCKETS_128
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// Define TLSH_STRING_LEN, which is the string lenght of the hex value of the Tlsh hash.
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// BUCKETS_256 & CHECKSUM_3B are compiler switches defined in CMakeLists.txt
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#if defined BUCKETS_256
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#if defined CHECKSUM_3B
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#define TLSH_STRING_LEN 138
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#else
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#define TLSH_STRING_LEN 134
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#endif
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// changed the minimum data length to 256 for version 3.3
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#define MIN_DATA_LENGTH 256
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// added the -force option for version 3.5
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#define MIN_FORCE_DATA_LENGTH 50
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#endif
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#if defined BUCKETS_128
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#if defined CHECKSUM_3B
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#define TLSH_STRING_LEN 74
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#else
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#define TLSH_STRING_LEN 70
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#endif
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// changed the minimum data length to 256 for version 3.3
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#define MIN_DATA_LENGTH 256
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// added the -force option for version 3.5
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#define MIN_FORCE_DATA_LENGTH 50
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#endif
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#if defined BUCKETS_48
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// No 3 Byte checksum option for 48 Bucket min hash
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#define TLSH_STRING_LEN 30
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// changed the minimum data length to 256 for version 3.3
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#define MIN_DATA_LENGTH 10
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// added the -force option for version 3.5
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#define MIN_FORCE_DATA_LENGTH 10
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#endif
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#define TLSH_STRING_BUFFER_LEN (TLSH_STRING_LEN+1)
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#ifdef WINDOWS
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#include <WinFunctions.h>
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#else
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#if defined(__SPARC) || defined(_AS_MK_OS_RH73)
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#define TLSH_API
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#else
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#define TLSH_API __attribute__ ((visibility("default")))
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#endif
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#endif
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class TLSH_API Tlsh{
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public:
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Tlsh();
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Tlsh(const Tlsh& other);
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/* allow the user to add data in multiple iterations */
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void update(const unsigned char* data, unsigned int len);
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/* to signal the class there is no more data to be added */
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void final(const unsigned char* data = NULL, unsigned int len = 0, int force_option = 0);
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/* to get the hex-encoded hash code */
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const char* getHash() const ;
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/* to get the hex-encoded hash code without allocating buffer in TlshImpl - bufSize should be TLSH_STRING_BUFFER_LEN */
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const char* getHash(char *buffer, unsigned int bufSize) const;
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/* to bring to object back to the initial state */
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void reset();
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// access functions
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int Lvalue();
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int Q1ratio();
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int Q2ratio();
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/* calculate difference */
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/* The len_diff parameter specifies if the file length is to be included in the difference calculation (len_diff=true) or if it */
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/* is to be excluded (len_diff=false). In general, the length should be considered in the difference calculation, but there */
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/* could be applications where a part of the adversarial activity might be to add a lot of content. For example to add 1 million */
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/* zero bytes at the end of a file. In that case, the caller would want to exclude the length from the calculation. */
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int totalDiff(const Tlsh *, bool len_diff=true) const;
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/* validate TrendLSH string and reset the hash according to it */
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int fromTlshStr(const char* str);
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/* check if Tlsh object is valid to operate */
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bool isValid() const;
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/* Return the version information used to build this library */
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static const char *version();
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// operators
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Tlsh& operator=(const Tlsh& other);
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bool operator==(const Tlsh& other) const;
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bool operator!=(const Tlsh& other) const;
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~Tlsh();
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private:
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TlshImpl* impl;
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};
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#ifdef TLSH_DISTANCE_PARAMETERS
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void set_tlsh_distance_parameters(int length_mult_value, int qratio_mult_value, int hist_diff1_add_value, int hist_diff2_add_value, int hist_diff3_add_value);
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#endif
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#endif
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#endif
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