---
name: "OSSL_STORE_attach"
section: "3ssl"
platform: "linux"
package: "openssl"
version: "3.6.5-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/OSSL_STORE_attach"
---

# OSSL\_STORE\_attach(3ssl)

Functions to read objects from a BIO

## NAME

OSSL\_STORE\_attach - Functions to read objects from a BIO

## SYNOPSIS

```
 #include <openssl/store.h>
 OSSL_STORE_CTX *OSSL_STORE_attach(BIO *bio, const char *scheme,
                                   OSSL_LIB_CTX *libctx, const char *propq,
                                   const UI_METHOD *ui_method, void *ui_data,
                                   const OSSL_PARAM params[],
                                   OSSL_STORE_post_process_info_fn post_process,
                                   void *post_process_data);
```

## DESCRIPTION

**OSSL\_STORE\_attach()** works like **OSSL\_STORE\_open**(3), except it takes a **BIO** *bio* instead of a *uri*, along with a *scheme* to determine what loader should be used to process the data. The reference count of the **BIO** object is increased by 1 if the call is successful.

## RETURN VALUES

**OSSL\_STORE\_attach()** returns a pointer to a **OSSL\_STORE\_CTX** on success, or NULL on failure.

## SEE ALSO

**ossl\_store**(7), **OSSL\_STORE\_open**(3)

## HISTORY

**OSSL\_STORE\_attach()** was added in OpenSSL 3.0.

## COPYRIGHT

Copyright 2020-2021 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\>.