stuff

buildfiles/app/node_modules/nodeezcryptor/native/decryptor.cc

@@ -0,0 +1,52 @@
+#include <napi.h>
+#include <iostream>
+#include "decryptor.h"
+
+Napi::Value napiGetKey(const Napi::CallbackInfo& info) {
+    Napi::Env env = info.Env();
+
+    std::string trackIdArg = info[0].As<Napi::String>().Utf8Value();
+    char* trackId = new char[trackIdArg.length() + 1];
+    strcpy(trackId, trackIdArg.c_str());
+
+    char key[16];
+    getKey(trackId, key);
+    return Napi::String::New(env, key, 16);
+}
+
+void napiDecryptFile(const Napi::CallbackInfo& info) {
+    std::string decKeyArg = info[0].As<Napi::String>().Utf8Value();
+    char* decKey = new char[17];
+    strcpy(decKey, decKeyArg.c_str());
+
+    std::string inputFn = info[1].As<Napi::String>().Utf8Value();
+    std::string outputFn = info[2].As<Napi::String>().Utf8Value();
+    decryptFile(decKey, inputFn.c_str(), outputFn.c_str());
+    
+    return;
+}
+
+Napi::Value napiDecryptBuffer(const Napi::CallbackInfo& info) {
+    Napi::Env env = info.Env();
+
+    std::string decKeyArg = info[0].As<Napi::String>().Utf8Value();
+    char* decKey = new char[17];
+    strcpy(decKey, decKeyArg.c_str());
+    size_t arrlen = info[1].As<Napi::Buffer<unsigned char>>().Length();
+    unsigned char* buffer = info[1].As<Napi::Buffer<unsigned char>>().Data();
+
+    unsigned char* decrypted = new unsigned char[arrlen];
+    decryptBytes(decKey, arrlen, buffer, decrypted);
+
+    return Napi::Buffer<unsigned char>::New(env, decrypted, arrlen);
+}
+
+
+Napi::Object Init(Napi::Env env, Napi::Object exports) {
+    exports.Set(Napi::String::New(env, "getKey"), Napi::Function::New(env, napiGetKey));
+    exports.Set(Napi::String::New(env, "decryptFile"), Napi::Function::New(env, napiDecryptFile));
+    exports.Set(Napi::String::New(env, "decryptBuffer"), Napi::Function::New(env, napiDecryptBuffer));
+    return exports;
+}
+
+NODE_API_MODULE(decryptor, Init)

buildfiles/app/node_modules/nodeezcryptor/native/decryptor.h

@@ -0,0 +1,73 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <openssl/md5.h>
+#include <openssl/blowfish.h>
+
+void getKey(char* trackId, char* key) {
+    unsigned char digest[MD5_DIGEST_LENGTH];
+    MD5_CTX context;
+    MD5_Init(&context);
+    MD5_Update(&context, trackId, strlen(trackId));
+    MD5_Final(digest, &context);
+
+    char MD5String[33];
+    for (int i = 0; i < 16; i++)
+        sprintf(&MD5String[i*2], "%02x", (unsigned int)digest[i]);
+
+    const char secret[] = "g4el58wc0zvf9na1";
+    
+    for(int i=0; i<16; i++)
+        key[i] = MD5String[i] ^ MD5String[i+16] ^ secret[i];
+}
+
+void decryptFile(char* decKey, const char* inputfn, const char* outputfn) {
+    unsigned char* bfKey = reinterpret_cast<unsigned char*>(decKey);
+    BF_KEY key;
+    BF_set_key(&key, 16, bfKey);
+
+    FILE* ofile = fopen(outputfn, "wb");
+    FILE* ifile = fopen(inputfn, "rb");
+
+    int i=0;
+    while (!feof(ifile)) {
+        unsigned char buffer[2048];
+        int read = fread(buffer, 1, 2048, ifile);
+        if (i % 3 == 0 && read == 2048) {
+            unsigned char decrypted[2048];
+            unsigned char IV[8] = {0,1,2,3,4,5,6,7};
+            BF_cbc_encrypt(buffer, decrypted, 2048, &key, IV, BF_DECRYPT);
+            fwrite(decrypted, sizeof(unsigned char), sizeof(decrypted), ofile);
+        } else {
+            fwrite(buffer, sizeof(unsigned char), read, ofile);
+        }
+        i++;
+    }
+    fclose(ofile);
+    fclose(ifile);
+}
+
+void decryptBytes(char* decKey, long length, unsigned char* data, unsigned char* output) {
+    unsigned char* bfKey = reinterpret_cast<unsigned char*>(decKey);
+    BF_KEY key;
+    BF_set_key(&key, 16, bfKey);
+    int count = length/2048;
+
+    int i=0;
+    for(i=0; i<count; i++) {
+        if (i % 3 == 0) {
+            unsigned char buffer[2048];
+            memcpy(buffer, &data[i*2048], 2048);
+            
+            unsigned char decrypted[2048];
+            unsigned char IV[8] = {0,1,2,3,4,5,6,7};
+            BF_cbc_encrypt(buffer, decrypted, 2048, &key, IV, BF_DECRYPT);
+            memcpy(&output[i*2048], decrypted, 2048);
+        } else {
+            memcpy(&output[i*2048], &data[i*2048], 2048);
+        }
+    }
+    if (length % 2048 != 0){
+        memcpy(&output[i*2048], &data[i*2048], (length-(i*2048)));
+    }
+}