gnutls_certificate_set_x509_key_file2 - Linux


gnutls_certificate_set_x509_key_file2 is a versatile command within the GnuTLS library specifically designed to set the private key for a given certificate using an external X.509-formatted key file. Utilized in network security, it allows users to securely associate a private key with a certificate.


gnutls_certificate_set_x509_key_file2 (gnutls_certificate_t certificate, const char *file, gnutls_x509_crt_fmt_t file_type);


| Option | Description |
| certificate | Specifies the GnuTLS certificate to be modified. |
| file | Defines the path to the external X.509-formatted key file. |
| file_type | Specifies the file format of the external key file. Options include GNUTLS_X509_FMT_PEM, GNUTLS_X509_FMT_DER, or GNUTLS_X509_FMT_AUTO. |


Basic Usage:
Set a private key for a certificate from a PEM-encoded key file:

gnutls_certificate_set_x509_key_file2(cert, "key.pem", GNUTLS_X509_FMT_PEM);

Setting Key from DER-formatted File:
Load a private key from a DER-encoded key file:

gnutls_certificate_set_x509_key_file2(cert, "key.der", GNUTLS_X509_FMT_DER);

Determining File Format Automatically:
Let GnuTLS automatically detect the key file format:

gnutls_certificate_set_x509_key_file2(cert, "key", GNUTLS_X509_FMT_AUTO);

Common Issues

  • Incorrect File Path: Ensure the specified file path to the key file is correct.
  • Invalid Key Format: Verify that the key file is in the specified X.509 format (PEM or DER).
  • Permissions Denied: Check if the user has sufficient permissions to read the key file.


Using with GnuTLS Functions:
Combine with other GnuTLS functions to manage certificates, such as gnutls_certificate_set_x509_key_file() to set a key from a DER-encoded file.

Command Chaining:
Pipe the output of gnutls_certificate_set_x509_key_file2 to other commands to perform subsequent operations, e.g., grep to filter specific fields.

Related Commands

  • gnutls_certificate_set_x509_key_file(): Sets a key from a DER-encoded file.
  • gnutls_certificate_get_x509_key(): Retrieves the private key associated with a certificate.
  • gnutls_x509_crt_init(): Creates an X.509 certificate object for further operations.