gnutls_certificate_get_peers - Linux


gnutls_certificate_get_peers is a command-line tool used to extract the peer certificates from a GnuTLS certificate chain. This information is crucial for establishing secure connections in client-server applications and verifying the authenticity of the remote party.


gnutls_certificate_get_peers [OPTIONS] <certificate_file>


  • -v, –verbose: Enable verbose output, providing detailed information about the certificate chain.
  • -d, –debug: Output debugging information, useful for troubleshooting issues.
  • -b, –binary: Display the certificate in binary format.
  • -p, –pem: Display the certificate in PEM format.
  • -t, –text: Display the certificate in text format.
  • -h, –help: Display help and usage information.


Extract the peer certificates from a PEM-encoded certificate file:

gnutls_certificate_get_peers -t my_certificate.pem

Extract the peer certificates in a binary format:

gnutls_certificate_get_peers -b my_certificate.pem

Common Issues

  • Invalid certificate file: Ensure that the certificate file path is correct and that the certificate is in a valid format.
  • Permissions errors: Verify that you have the necessary read permissions for the certificate file.


This command can be integrated into scripts or workflows for:

  • Verifying the authenticity of remote servers.
  • Analyzing certificate chains for security vulnerabilities.
  • Generating reports on certificate validity and expiration.

Related Commands

  • openssl: A versatile tool for managing and analyzing X.509 certificates.
  • gnutls-cli: A command-line interface for GnuTLS, providing certificate management and secure communication capabilities.