- NAME
- SYNOPSIS
- DESCRIPTION
- NOTES
- RETURN VALUES
- SEE ALSO
- COPYRIGHT

# NAME

X509_STORE_CTX_get_by_subject, X509_STORE_CTX_get_obj_by_subject - X509 and X509_CRL lookup functions

# SYNOPSIS

    #include <openssl/x509_vfy.h>

    int X509_STORE_CTX_get_by_subject(const X509_STORE_CTX *vs,
                                      X509_LOOKUP_TYPE type,
                                      const X509_NAME *name, X509_OBJECT *ret);
    X509_OBJECT *X509_STORE_CTX_get_obj_by_subject(X509_STORE_CTX *vs,
                                                   X509_LOOKUP_TYPE type,
                                                   const X509_NAME *name);

# DESCRIPTION

X509_STORE_CTX_get_by_subject() tries to find an object of given type, which may be X509_LU_X509 or X509_LU_CRL, and subject name from the store in the provided store context vs. If found and ret is not NULL, it increments the reference count and stores the looked up object in ret.

X509_STORE_CTX_get_obj_by_subject() is like X509_STORE_CTX_get_by_subject() but returns the found object on success, else NULL.

# NOTES

These functions are safe to use in a multithreaded environment and with lookup functions on the same store.

Applications sharing a store across threads should manage its lifetime with X509_STORE_up_ref(3) and X509_STORE_free(3), and must ensure that all lookup operations have completed before the store is freed. See "Thread Safety" in X509_STORE_new(3) for more discussion of the X509_STORE threading model.

# RETURN VALUES

X509_STORE_CTX_get_by_subject() returns 1 if the lookup was successful, else 0.

X509_STORE_CTX_get_obj_by_subject() returns an object on success, else NULL.

# SEE ALSO

X509_LOOKUP_meth_set_get_by_subject(3), X509_LOOKUP_by_subject(3), X509_STORE_new(3)

# COPYRIGHT

Copyright 2022-2026 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the Apache License 2.0 (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 https://www.openssl.org/source/license.html.