feat: implement encryption

src/encryptor.c

@@ -0,0 +1,61 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <aes.h>
+
+#include "hwinfo.h"
+#include "util.h"
+
+int main(int argc, char** argv) {
+    if (argc != 3) {
+        return 1;
+    }
+
+    char* input = argv[1];
+    char* output = argv[2];
+
+    hw_info_t hwinfo = {0};
+    if(get_hw_info(&hwinfo) != 0){
+        return 1;
+    }
+
+    uint8_t* key = hwinfo_to_key(hwinfo);
+
+    if(key == NULL) {
+        return 1;
+    }
+
+    fprintf(stderr, "HWINFO: %s\n", hw_info_flatten(hwinfo));
+
+    fprintf(stderr, "Key: ");
+    for (int i = 0; i < 16; i++)
+        fprintf(stderr, "%02X", key[i]);
+    fprintf(stderr, "\n");
+
+    struct AES_ctx ctx;
+    uint8_t nonce[16] = {0};
+
+    FILE* license = fopen(input, "rb");
+    long data_start = ftell(license);
+    fseek(license, 0, SEEK_END);
+    int license_size = ftell(license) - data_start;
+    fseek(license, data_start, SEEK_SET);
+    uint8_t* buf = malloc(license_size);
+    fread(buf, 1, license_size, license);
+
+
+    AES_init_ctx(&ctx, key);
+    AES_init_ctx_iv(&ctx, key, nonce);
+    AES_CTR_xcrypt_buffer(&ctx, buf, license_size);
+
+    FILE* encrypted_license = fopen(output, "wb+");
+    fwrite(&nonce, 1, sizeof(nonce), encrypted_license);
+    fwrite(buf, 1, license_size, encrypted_license);
+
+    fclose(license);
+    fclose(encrypted_license);
+
+    fprintf(stderr, "Wrote encrypted license file to %s\n", output);
+
+    return 0;
+}