Envisiontec Ultra 3DP SLA printer/encrypt: Difference between revisions
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(Created page with "C++ version by RSpliet : <pre>#include <string> #include <iostream> using namespace std; class crypt { private: void SwapCharacter(string &csString, int iPosA, int iPosB) {...") |
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Revision as of 17:16, 6 July 2020
C++ version by RSpliet :
#include <string>
#include <iostream>
using namespace std;
class crypt {
private:
void SwapCharacter(string &csString, int iPosA, int iPosB)
{
char ch1 = csString[iPosA];
char ch2 = csString[iPosB];
csString[iPosA] = ch2;
csString[iPosB] = ch1;
}
int GetNextReturn(int iInitialIndex)
{
int num;
do
{
++iInitialIndex;
num = 2;
while (num < iInitialIndex && iInitialIndex % num != 0)
++num;
} while (num != iInitialIndex);
return iInitialIndex;
}
int GetPrimaryIndex(int iIndex)
{
int iInitialIndex = 1;
for (int index = 1; index < iIndex; ++index)
iInitialIndex = GetNextReturn(iInitialIndex);
return iInitialIndex;
}
public:
string Decrypt(string csString)
{
for (int index = csString.length() - 1; index >= 0; --index) {
int iPosB = index;
int iPosA = GetPrimaryIndex(index + 3) % csString.length();
SwapCharacter(csString, iPosA, iPosB);
}
return csString;
}
string Encrypt(string csString)
{
for (int index = 0; index < csString.length(); index++) {
int iPosB = index;
int iPosA = GetPrimaryIndex(index + 3) % csString.length();
SwapCharacter(csString, iPosA, iPosB);
}
return csString;
}
};
int main(int argc, char **argv)
{
crypt C;
string cs = C.Encrypt("piehole");
string ds = C.Decrypt(cs);
cout << cs << endl;
cout << ds << endl;
return 0;
}
Go version by mrngm :
package main
import (
"fmt"
)
func Encrypt(s string) string {
encLen := len(s)
encBytes := []byte(s)
for i := 0; i < encLen; i++ {
oidx := offsetIndex(i + 3)
newpos := oidx % encLen
// fmt.Printf("i: %d (oidx: %d), newpos: %d\n", i, oidx, newpos)
encBytes[newpos], encBytes[i] = encBytes[i], encBytes[newpos]
}
return string(encBytes)
}
func Decrypt(s string) string {
decLen := len(s)
decBytes := []byte(s)
for i := decLen - 1; i >= 0; i-- {
oidx := offsetIndex(i + 3)
newpos := oidx % decLen
// fmt.Printf("i: %d (oidx: %d), newpos: %d\n", i, oidx, newpos)
decBytes[newpos], decBytes[i] = decBytes[i], decBytes[newpos]