EVP_CIPHER_CTX_get_original_iv, EVP_CIPHER_CTX_get_updated_iv, EVP_CIPHER_CTX_iv,

       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>.

3.5.0                                              2025-06-04               EVP_CIPHER_CTX_GET_ORIGINAL_IV(3SSL)

EVP_CIPHER_CTX_get_original_iv() and EVP_CIPHER_CTX_get_updated_iv() copy initialization vector (IV)
       information from the EVP_CIPHER_CTX into the caller-supplied buffer. EVP_CIPHER_CTX_get_iv_length(3) can
       be used to determine an appropriate buffer size, and if the supplied buffer is too small, an error will
       be returned (and no data copied).  EVP_CIPHER_CTX_get_original_iv() accesses the ("original") IV that was
       supplied when the EVP_CIPHER_CTX was initialized, and EVP_CIPHER_CTX_get_updated_iv() accesses the
       current "IV state" of the cipher, which is updated during cipher operation for certain cipher modes
       (e.g., CBC and OFB).

       The functions EVP_CIPHER_CTX_iv(), EVP_CIPHER_CTX_original_iv(), and EVP_CIPHER_CTX_iv_noconst() are
       deprecated functions that provide similar (at a conceptual level) functionality.  EVP_CIPHER_CTX_iv()
       returns a pointer to the beginning of the "IV state" as maintained internally in the EVP_CIPHER_CTX;
       EVP_CIPHER_CTX_original_iv() returns a pointer to the beginning of the ("original") IV, as maintained by
       the EVP_CIPHER_CTX, that was provided when the EVP_CIPHER_CTX was initialized; and
       EVP_CIPHER_CTX_get_iv_noconst() is the same as EVP_CIPHER_CTX_iv() but has a different return type for
       the pointer.

EVP_CIPHER_CTX_get_original_iv() and EVP_CIPHER_CTX_get_updated_iv() were added in OpenSSL 3.0.0.

       EVP_CIPHER_CTX_iv(), EVP_CIPHER_CTX_original_iv(), and EVP_CIPHER_CTX_iv_noconst() were added in OpenSSL
       1.1.0, and were deprecated in OpenSSL 3.0.0.

       EVP_CIPHER_CTX_get_original_iv, EVP_CIPHER_CTX_get_updated_iv, EVP_CIPHER_CTX_iv,
       EVP_CIPHER_CTX_original_iv, EVP_CIPHER_CTX_iv_noconst - Routines to inspect EVP_CIPHER_CTX IV data

EVP_CIPHER_CTX_get_original_iv() and EVP_CIPHER_CTX_get_updated_iv() return 1 on success and 0 on
       failure.

       The functions EVP_CIPHER_CTX_iv(), EVP_CIPHER_CTX_original_iv(), and EVP_CIPHER_CTX_iv_noconst() return a
       pointer to an IV as an array of bytes on success, and NULL on failure.

        #include <openssl/evp.h>

        int EVP_CIPHER_CTX_get_original_iv(EVP_CIPHER_CTX *ctx, void *buf, size_t len);
        int EVP_CIPHER_CTX_get_updated_iv(EVP_CIPHER_CTX *ctx, void *buf, size_t len);

       The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining
       OPENSSL_API_COMPAT with a suitable version value, see openssl_user_macros(7):

        const unsigned char *EVP_CIPHER_CTX_iv(const EVP_CIPHER_CTX *ctx);
        const unsigned char *EVP_CIPHER_CTX_original_iv(const EVP_CIPHER_CTX *ctx);
        unsigned char *EVP_CIPHER_CTX_iv_noconst(EVP_CIPHER_CTX *ctx);