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====== Кодирование стороки методом XOR ======
Отличная простейшая кодировка строки, или файла методом XOR.

<code c xor.c>

#include <stdio.h>
#include <stdlib.h>


char pass[] = "secret";
char buff[] = "Hello, World!";

void strxor(char* x, int xl, char* n, int nl) {
    for ( int i=0 ; i<xl ; i++ ) {
        char pwdor = n[i%nl];
        x[i] = (x[i] ^ pwdor) & 0xFF;
    }
}


int main() {
    int blen = sizeof(buff);

    char* buff1 = (char*) malloc(blen);
    memcpy(buff1, buff, blen);
    strxor(buff1, blen, pass, strlen(pass));

    char* buff2 = (char*) malloc(blen);
    memcpy(buff2, buff1, blen);
    strxor(buff2, blen, pass, strlen(pass));

    for ( int i=0 ; i<blen ; i++ ) { // Textual Out
        printf("%C  ", buff[i]);
    } printf("\n");

    for ( int i=0 ; i<blen ; i++ ) { // HEX out
        printf("%02X ", buff[i]);
    } printf("\n");

    for ( int i=0 ; i<blen ; i++ ) { // Encrypted out
        printf("%02X ", buff1[i]);
    } printf("\n");

    for ( int i=0 ; i<blen ; i++ ) { // Encrypted textual
        printf("%C  ", buff1[i]);
    } printf("\n");

    for ( int i=0 ; i<blen ; i++ ) { // Decrypted textual
        printf("%C  ", buff2[i]);
    } printf("\n");

    free(buff1);
    free(buff2);

    return 0;
}
</code>

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