[hovatek]

This guide will explain how to generate a custom key which can be used to sign your Android images like boot, recovery, system etc. This guide will come in handy in a case where the bootloader only accepts signed images (whether self-signed or factory-signed).

Requirements

• A PC (I'm using Windows for this guide)
  
• Download and install OpenSSL Light for Windows @ https://slproweb.com/products/Win32OpenSSL.html
  

Steps to create a custom signing key using OpenSSL

Follow the steps below to generate a custom private key

See the video tutorial below or @ https://youtu.be/uICvoalIUf8

1. Tap the Start menu and search for cmd.exe
   
   
   
   
2. Right-click CMD from the results and run as Administrator
   
   
   
   
3. Click Yes when prompted
   
4. Open the directory where OpenSSL was installed to and open the bin folder (mine is C:\Program Files\OpenSSL-Win64\bin . Ensure to enter yours in the command below)
   
   
   
   
5. Right-click the address bar and select Copy address
   
   
   
   
6. Go back to command prompt, type this command (use your own location) and tap Enter
   
   Code:

   cd C:\Program Files\OpenSSL-Win64\bin
   
   
   
   
7. You should now be in the C:\Program Files\OpenSSL-Win64\bin at command prompt
   
   
   
   
8. Type this command (I've chosen to name my key hovatek) and tap Enter
   
   Code:

   openssl genrsa -f4 -out hovatek.pem 4096
   
   
   
   
9. Wait till its done (i.e back to C:\Program Files\OpenSSL-Win64\bin>_)
   
   
   
   
10. You should now find a hovatek.pem file
    
    
    

Important Notice

• Your OpenSSL installation directory might vary from mine so ensure to enter yours
  
• The generated .pem file is a custom one and very likely to be different from what your device's OEM uses to sign its images
  

[nheaven]

Why I can't get a .pem file after running OpenSSL in the bin folder?

[X3non]

Why I can't get a .pem file after running OpenSSL in the bin folder?

depends on the folder path where you ran the openssl command and what command you sent
you should upload a screenshot showing your cmd prompt window

[nheaven]

Why I can't get a .pem file after running OpenSSL in the bin folder?

depends on the folder path where you ran the openssl command and what command you sent
you should upload a screenshot showing your cmd prompt window

I can get the output in Linux, but not in windows 7

[Kelexine]

Why I can't get a .pem file after running OpenSSL in the bin folder?

depends on the folder path where you ran the openssl command and what command you sent
you should upload a screenshot showing your cmd prompt window

you can just add it to path in environmentalal variables