Software⏱️ 3 min read📅 2026-06-11

How to Fix: Troubleshooting GnuPG "get_key failed" error caused by incorrect filesystem permissions

GnuPG permissions issue for PHP encryption/decryption.

Quick Answer: Set the ownership and permissions of ~/.gnupg to the Apache user (www) to resolve the 'get_key failed' error.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🚀 How to Resolve This Issue
  3. 💡 Conclusion

The GnuPG 'get_key failed' error is encountered when PHP's GnuPG extension fails to retrieve a key due to incorrect filesystem permissions. This issue affects users who plan to use the GnuPG extension for encryption and decryption purposes, such as those using PHP's GnuPG extension in their web applications.

This error can be frustrating, especially when working with keys generated by GPG Keychain Access or other tools. To resolve this issue, we will explore the root causes of the problem and provide a step-by-step guide to fix it.

💡 Why You Are Getting This Error

  • The primary reason for this error is that the filesystem permissions on the ~/.gnupg folder and enclosed files are not set correctly. The GnuPG extension requires specific permissions to access and manage keys.
  • An alternative reason could be that the user running the PHP script does not have the necessary permissions to access the GnuPG keys or the ~/.gnupg folder.

🚀 How to Resolve This Issue

Setting Correct Filesystem Permissions

  1. Step 1: Change the ownership of the ~/.gnupg folder and enclosed files to the user running the PHP script. This can be done using the `chown` command in the terminal, for example: `sudo chown -R username:username /Users/username/.gnupg/`. Note that this assumes the user running the PHP script is the same as the one who generated the keys.
  2. Step 2: Set the correct permissions on the ~/.gnupg folder and enclosed files. The recommended permissions are `-rw-r--r--` for the owner, `-rw-r--r--` for the group, and `-rw-r--r--` for others. This can be done using the `chmod` command in the terminal, for example: `sudo chmod -R 644 /Users/username/.gnupg/`. Note that these permissions allow read and write access to the owner and group, but not to others.

Using a Different GnuPG Configuration

  1. Step 1: Configure PHP's GnuPG extension to use a different configuration file or directory. This can be done by setting the `gnupg_dir` and `gnupg_options` variables in the PHP configuration file, for example: `extension=gpg.so gnupg_dir=/path/to/gnupg/dir gnupg_options=--keyring=/path/to/keyring/.gnupg`. Note that this method may require additional configuration and testing to ensure compatibility with other parts of the application.

💡 Conclusion

To resolve the 'get_key failed' error caused by incorrect filesystem permissions, set the correct permissions on the ~/.gnupg folder and enclosed files using the `chown` and `chmod` commands. Alternatively, configure PHP's GnuPG extension to use a different configuration file or directory. By following these steps, users should be able to resolve this issue and successfully use the GnuPG extension for encryption and decryption purposes.

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