EVP_CIPHER_CTX_get_cipher_data, EVP_CIPHER_CTX_set_cipher_data - Routines to inspect and modify

       Copyright 2016 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>.

3.5.0                                              2025-06-04               EVP_CIPHER_CTX_GET_CIPHER_DATA(3SSL)

       The EVP_CIPHER_CTX_get_cipher_data() function returns a pointer to the cipher data relevant to
       EVP_CIPHER_CTX. The contents of this data is specific to the particular implementation of the cipher. For
       example this data can be used by engines to store engine specific information. The data is automatically
       allocated and freed by OpenSSL, so applications and engines should not normally free this directly (but
       see below).

       The EVP_CIPHER_CTX_set_cipher_data() function allows an application or engine to replace the cipher data
       with new data. A pointer to any existing cipher data is returned from this function. If the old data is
       no longer required then it should be freed through a call to OPENSSL_free().

       The EVP_CIPHER_CTX_get_cipher_data() and EVP_CIPHER_CTX_set_cipher_data() functions were added in OpenSSL
       1.1.0.

       EVP_CIPHER_CTX_get_cipher_data, EVP_CIPHER_CTX_set_cipher_data - Routines to inspect and modify
       EVP_CIPHER_CTX objects

       The EVP_CIPHER_CTX_get_cipher_data() function returns a pointer to the current cipher data for the
       EVP_CIPHER_CTX.

       The EVP_CIPHER_CTX_set_cipher_data() function returns a pointer to the old cipher data for the
       EVP_CIPHER_CTX.

        #include <openssl/evp.h>

        void *EVP_CIPHER_CTX_get_cipher_data(const EVP_CIPHER_CTX *ctx);
        void *EVP_CIPHER_CTX_set_cipher_data(EVP_CIPHER_CTX *ctx, void *cipher_data);