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Command: EVP_CIPHER_CTX_get_cipher_data | Section: 3 | Source: OpenBSD | File: EVP_CIPHER_CTX_get_cipher_data.3
EVP_CIPHER_CTX_GET_CIPHER_DATA(3) FreeBSD Library Functions Manual
NAME
EVP_CIPHER_CTX_get_cipher_data, EVP_CIPHER_CTX_set_cipher_data,
EVP_CIPHER_CTX_buf_noconst - inspect and modify EVP_CIPHER_CTX objects
SYNOPSIS
#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);
unsigned char *
EVP_CIPHER_CTX_buf_noconst(EVP_CIPHER_CTX *ctx);
DESCRIPTION
EVP_CIPHER_CTX_get_cipher_data() returns a pointer to the cipher data of
ctx. The format and content of this data is specific to the algorithm
and 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).
EVP_CIPHER_CTX_set_cipher_data() allows an application or engine to
replace the existing cipher data with new data, transferring ownership of
cipher_data to the ctx object. A pointer to any existing cipher data is
returned from this function. If the old data is no longer required, it
should be freed through a call to free(3).
EVP_CIPHER_CTX_buf_noconst() provides engines and custom cipher
implementations with access to the internal buffer that
EVP_EncryptUpdate(3) copies input data into before encrypting it. This
function can for example be used inside callback functions installed with
EVP_CIPHER_meth_set_do_cipher(3).
RETURN VALUES
EVP_CIPHER_CTX_get_cipher_data() returns an internal pointer owned by
ctx.
EVP_CIPHER_CTX_set_cipher_data() returns a pointer to the old cipher data
of ctx and transfers ownership to the caller.
EVP_CIPHER_CTX_buf_noconst() returns a pointer to an internal buffer
owned by ctx.
SEE ALSO
evp(3), EVP_CIPHER_meth_new(3), EVP_EncryptInit(3)
HISTORY
EVP_CIPHER_CTX_get_cipher_data(), EVP_CIPHER_CTX_set_cipher_data(), and
EVP_CIPHER_CTX_buf_noconst() first appeared in OpenSSL 1.1.0 and have
been available since OpenBSD 7.1.
FreeBSD 14.1-RELEASE-p8 August 26, 2023 FreeBSD 14.1-RELEASE-p8