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ghash.cpp
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1//
2// Copyright (C) 2001-2021 Graeme Walker <graeme_walker@users.sourceforge.net>
3//
4// This program is free software: you can redistribute it and/or modify
5// it under the terms of the GNU General Public License as published by
6// the Free Software Foundation, either version 3 of the License, or
7// (at your option) any later version.
8//
9// This program is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12// GNU General Public License for more details.
13//
14// You should have received a copy of the GNU General Public License
15// along with this program. If not, see <http://www.gnu.org/licenses/>.
16// ===
17///
18/// \file ghash.cpp
19///
20
21#include "gdef.h"
22#include "ghash.h"
23#include "gassert.h"
24#include <sstream>
25
26std::string G::Hash::xor_( const std::string & s1 , const std::string & s2 )
27{
28 G_ASSERT( s1.length() == s2.length() ) ;
29 std::string::const_iterator p1 = s1.begin() ;
30 std::string::const_iterator p2 = s2.begin() ;
31 std::string result ;
32 result.reserve( s1.length() ) ;
33 for( ; p1 != s1.end() ; ++p1 , ++p2 )
34 {
35 auto c1 = static_cast<unsigned char>(*p1) ;
36 auto c2 = static_cast<unsigned char>(*p2) ;
37 auto c = static_cast<unsigned char>( c1 ^ c2 ) ;
38 result.append( 1U , static_cast<char>(c) ) ;
39 }
40 return result ;
41}
42
43std::string G::Hash::ipad( std::size_t blocksize )
44{
45 return std::string( blocksize , '\066' ) ;
46}
47
48std::string G::Hash::opad( std::size_t blocksize )
49{
50 return std::string( blocksize , '\134' ) ;
51}
52
53std::string G::Hash::printable( const std::string & input )
54{
55 std::string result ;
56 result.reserve( input.length() * 2U ) ;
57 const char * hex = "0123456789abcdef" ;
58 const std::size_t n = input.length() ;
59 for( std::size_t i = 0U ; i < n ; i++ )
60 {
61 auto c = static_cast<unsigned char>(input.at(i)) ;
62 result.append( 1U , hex[(c>>4U)&0x0F] ) ;
63 result.append( 1U , hex[(c>>0U)&0x0F] ) ;
64 }
65 G_ASSERT( result.size() == (input.size()*2U) ) ;
66 return result ;
67}
68
G::Hash::printable
static std::string printable(const std::string &input)
Converts a binary string into a printable form, using a lowercase hexadecimal encoding.
Definition: ghash.cpp:53
gassert.h
ghash.h