Cryptography and SSL/TLS Toolkit



CTLOG_STORE_new, CTLOG_STORE_free, CTLOG_STORE_load_default_file, CTLOG_STORE_load_file - Create and populate a Certificate Transparency log list


 #include <openssl/ct.h>

 void CTLOG_STORE_free(CTLOG_STORE *store);

 int CTLOG_STORE_load_default_file(CTLOG_STORE *store);
 int CTLOG_STORE_load_file(CTLOG_STORE *store, const char *file);


A CTLOG_STORE is a container for a list of CTLOGs (Certificate Transparency logs). The list can be loaded from one or more files and then searched by LogID (see RFC 6962, Section 3.2, for the definition of a LogID).

CTLOG_STORE_new() creates an empty list of CT logs. This is then populated by CTLOG_STORE_load_default_file() or CTLOG_STORE_load_file(). CTLOG_STORE_load_default_file() loads from the default file, which is named "ct_log_list.cnf" in OPENSSLDIR (see the output of version). This can be overridden using an environment variable named "CTLOG_FILE". CTLOG_STORE_load_file() loads from a caller-specified file path instead. Both of these functions append any loaded CT logs to the CTLOG_STORE.

The expected format of the file is:


 description = Log 1
 key = <base64-encoded DER SubjectPublicKeyInfo here>

 description = Log 2
 key = <base64-encoded DER SubjectPublicKeyInfo here>

Once a CTLOG_STORE is no longer required, it should be passed to CTLOG_STORE_free(). This will delete all of the CTLOGs stored within, along with the CTLOG_STORE itself.


If there are any invalid CT logs in a file, they are skipped and the remaining valid logs will still be added to the CTLOG_STORE. A CT log will be considered invalid if it is missing a "key" or "description" field.


Both CTLOG_STORE_load_default_file and CTLOG_STORE_load_file return 1 if all CT logs in the file are successfully parsed and loaded, 0 otherwise.


ct(7), CTLOG_STORE_get0_log_by_id(3), SSL_CTX_set_ctlog_list_file(3)


These functions were added in OpenSSL 1.1.0.

Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at