PFX to PEM Certificate Converter

A PowerShell utility for batch converting PFX (PKCS#12) certificates to PEM format using OpenSSL.

Features

• Batch conversion of multiple PFX certificates to PEM format
• Automatic organization of processed certificates
• Maintains original PFX files in a separate directory
• Generates a processing list for tracking conversions
• Secure password handling for certificate decryption

Prerequisites

• PowerShell 5.1 or higher
• OpenSSL installed and accessible from PATH
• Appropriate permissions to read/write in the specified directories

Directory Structure

Certificate Script Dir/
├── PFX/            # Place PFX certificates here
├── PEM/            # Converted PEM certificates output
├── Old Files/      # Processed PFX files storage
└── PEM List.txt    # Generated list of processed certificates

Usage

1. Place your PFX certificates in the PFX directory
2. Run the script:

   .\pfx-to-pem-converter.ps1

3. Enter the password when prompted
4. The script will:
   • Create a list of PFX files to process
   • Convert each PFX to PEM format
   • Move processed PFX files to the Old Files directory
   • Output converted PEM files to the PEM directory

Configuration

Update the following path variables in the script to match your environment:

$PFXDir = "\\Certificate Script Dir\PFX\"
$PEMDir = "\\Certificate Script Dir\PEM\"
$OldFilesDir = "\\Certificate Script Dir\Old Files\"
$CertListFile = "\\Certificate Script Dir\PEM List.txt"

Security Notes

• The script handles sensitive certificate data - ensure appropriate file system permissions
• Password is handled as plain text for OpenSSL compatibility
• Keep converted PEM files secure as they contain unencrypted private keys

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.