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/*
* Normaliz
* Copyright (C) 2007-2025 W. Bruns, B. Ichim, Ch. Soeger, U. v. d. Ohe
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* As an exception, when this program is distributed through (i) the App Store
* by Apple Inc.; (ii) the Mac App Store by Apple Inc.; or (iii) Google Play
* by Google Inc., then that store may impose any digital rights management,
* device limits and/or redistribution restrictions that are required by its
* terms of service.
*/
#ifdef NMZ_HASHLIBRARY
#include <hash-library/sha256.h>
#endif
#include <iostream>
#include "general.h"
#include "libnormaliz/nmz_hash.h"
// hash-library by Stephan Brumme
// https://create.stephan-brumme.com/hash-library/
// https://github.com/stbrumme/hash-library
namespace libnormaliz {
using namespace std;
// Compute SHA-256 hash of a string, excluding final zero
// Return hex-values as string over '0',...,'9','a',...,'f'
// return string of 32 zeros as default if hash-library is not present
string sha256str(const string& text, bool verbose) {
#ifdef NMZ_HASHLIBRARY
SHA256 sha256;
return sha256(text);
#else
if (verbose)
verboseOutput() << "sha256str called but hash-library not present; "
"returning default value."
<< endl;
// string s = "00000000000000000000000000000000"; // 32 zeros
string s = "0";
return s;
#endif
}
// Compute SHA-256 hash of a string, excluding final zero
// Return as vector<unsigned char> of size sha256.HashBytes (== 32)
vector<unsigned char> sha256hexvec(const string& text, bool verbose) {
#ifdef NMZ_HASHLIBRARY
SHA256 sha256;
sha256.add(text.c_str(), text.size());
unsigned char rawHash[sha256.HashBytes];
sha256.getHash(rawHash);
int s = sizeof(rawHash) / sizeof(rawHash[0]);
// assuming sizeof(unsigned char) == 1, then s == sha256.HashBytes == 32
vector<unsigned char> v(rawHash, rawHash + s);
return v;
#else
if (verbose)
verboseOutput() << "sha256hexvec called but hash-library not present; "
"returning default value."
<< endl;
// vector<unsigned char> v(32, '0');
vector<unsigned char> v(1, '0');
// vector<unsigned char> v;
// cout << v.size() << endl;
return v;
#endif
}
} // namespace libnormaliz
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