Encryption / Dec Files "AES"
XOR & AES
encryption / decryption "XOR" Files
By XOR Target File Byte with AES Key File , It is Not Recoomend
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#pragma warning(disable:4996)
#define AES_KEY_SIZE 32
#define BUFFER_SIZE 4096
void xor_encrypt_decrypt(const unsigned char* key, const char* input_file, const char* output_file) {
FILE* in = fopen(input_file, "rb");
FILE* out = fopen(output_file, "wb");
if (!in || !out) {
perror("Failed to open file");
exit(EXIT_FAILURE);
}
unsigned char buffer[BUFFER_SIZE];
size_t bytes_read;
while ((bytes_read = fread(buffer, 1, BUFFER_SIZE, in)) > 0) {
for (size_t i = 0; i < bytes_read; i++) {
buffer[i] ^= key[i % AES_KEY_SIZE]; // XOR with the key
}
fwrite(buffer, 1, bytes_read, out);
}
fclose(in);
fclose(out);
printf("Operation completed. Output saved to %s\n", output_file);
}
void load_aes_key(const char* filename, unsigned char* key) {
FILE* file = fopen(filename, "rb");
if (!file) {
perror("Failed to open key file");
exit(EXIT_FAILURE);
}
fread(key, 1, AES_KEY_SIZE, file);
fclose(file);
}
int main() {
char mode;
char input_file[256], output_file[256];
const char* key_file = "aes_key.bin";
unsigned char key[AES_KEY_SIZE];
load_aes_key(key_file, key);
printf("Enter mode (e for encrypt, d for decrypt): ");
scanf(" %c", &mode);
printf("Enter input file name: ");
scanf(" %255s", input_file);
printf("Enter output file name: ");
scanf(" %255s", output_file);
if (mode == 'e') {
xor_encrypt_decrypt(key, input_file, output_file);
}
else if (mode == 'd') {
xor_encrypt_decrypt(key, input_file, output_file);
}
else {
printf("Invalid mode. Use 'e' for encryption or 'd' for decryption.\n");
return EXIT_FAILURE;
}
return 0;
}
2 - encryption / decryption Files With AES Key
This Code :
Gen AES Key Auto And Save It
Enc / Dec Large File
Add .crpt in File end
Alert !!!!!
This Code To Explane C prog language , And How to use it to encreption files with C
it's not to use a real word ransomware code .
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