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5c9e187b33c5d4419da55648/README

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+From https://crackmes.one/crackme/5c9e187b33c5d4419da55648

5c9e187b33c5d4419da55648/keygen.py

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+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import numpy as np
+
+"""
+int __fastcall generateSerial(char *Dest)
+{
+  char *output; // rbx
+  size_t name_len; // rax
+  unsigned int iterator; // edx
+  __int64 v4; // r9
+  __int64 v5; // rcx
+  int v6; // er9
+
+  output = Dest;
+  name_len = strlen(Dest);
+  iterator = 1;
+  v4 = 0i64;
+  while ( iterator <= name_len )
+  {
+    v5 = iterator - 1;
+    v6 = v4 + iterator++ + 3;
+    v4 = (unsigned int)(output[v5] + v6);
+  }
+  return sprintf(output, "%d-%d", 3 * (unsigned int)(name_len >> 1) + (unsigned int)name_len, v4);
+}
+"""
+
+
+def generate_serial(username):
+    output = username
+    name_len = len(username)
+    iterator = np.int(1)
+    v4 = np.int64(0) # r9
+    v5 = np.int64()  # rcx
+    v6 = np.int()    # er9
+
+
+    while iterator <= name_len:
+        v5 = iterator - 1
+        v6 = v4 + iterator + 3
+        iterator += 1
+        v4 = np.uint(ord(output[v5]) + v6)
+        #print("v4(r9): {}\tv5(rcx): {}\tv6(er9): {}".format(v4, v5, v6))
+
+    return "User: {}\tKey: {}-{}".format(username, 3 * np.uint(name_len >> 1) + np.uint(name_len), v4)
+
+
+print(generate_serial('BENFICA'))