OpenSoure_Repos/TheAlgorithms-C-Plus-Plus
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save keys to file + more docs

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This commit is contained in:
Krishna Vedala 2020-06-27 15:45:48 -04:00
parent 541f762deb
commit e8849dc36f
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GPG Key ID: BA19ACF8FC8792F7
1 changed files with 18 additions and 2 deletions
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20
ciphers/hill_cipher.cpp
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@ -26,6 +26,9 @@
*
* \note This program uses determinant computation using LU decomposition from
* the file lu_decomposition.h
* \note The matrix generation algorithm is very rudimentary and does not
* guarantee an invertible modulus matrix. \todo Better matrix generation
* algorithm.
*
* @author [Krishna Vedala](https://github.com/kvedala)
*/
@ -34,6 +37,7 @@
#include <cmath>
#include <cstring>
#include <ctime>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <string>
@ -350,7 +354,7 @@ class HillCipher {
if (mat_determinant < 0)
mat_determinant = (mat_determinant % L);
} while (std::abs(dd) > 1e3 || // while ill-defined
std::abs(dd) < 0.1 || // while singular
dd < 0.1 || // while singular or negative determinant
!std::isfinite(dd) || // while determinant is not finite
gcd(mat_determinant, L) != 1); // while no common factors
// std::cout <<
@ -483,6 +487,12 @@ void test1(const std::string &text) {
std::string txt_back = ciphers::HillCipher::decrypt_text(gibberish, dkey);
std::cout << "Reconstruct text:\n\t" << txt_back << std::endl;
std::ofstream out_file("hill_cipher_test1.txt");
out_file << "Block size: " << ekey.size() << "\n";
out_file << "Encryption Key:\n" << ekey;
out_file << "\nDecryption Key:\n" << dkey;
out_file.close();
assert(txt_back == text);
std::cout << "Passed :)\n";
}
@ -498,7 +508,7 @@ void test2(const std::string &text) {
<< std::endl;
std::pair<matrix<int>, matrix<int>> p =
ciphers::HillCipher::generate_keys(8, 0, 5);
ciphers::HillCipher::generate_keys(8, 0, 3);
matrix<int> ekey = p.first;
matrix<int> dkey = p.second;
@ -508,6 +518,12 @@ void test2(const std::string &text) {
std::string txt_back = ciphers::HillCipher::decrypt_text(gibberish, dkey);
std::cout << "Reconstruct text:\n\t" << txt_back << std::endl;
std::ofstream out_file("hill_cipher_test2.txt");
out_file << "Block size: " << ekey.size() << "\n";
out_file << "Encryption Key:\n" << ekey;
out_file << "\nDecryption Key:\n" << dkey;
out_file.close();
assert(txt_back.compare(0, text.size(), text) == 0);
std::cout << "Passed :)\n";
}