52 lines
1.7 KiB
Plaintext
52 lines
1.7 KiB
Plaintext
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=pod
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=head1 NAME
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EVP_CIPHER_CTX_get_cipher_data, EVP_CIPHER_CTX_set_cipher_data - Routines to
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inspect and modify EVP_CIPHER_CTX objects
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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void *EVP_CIPHER_CTX_get_cipher_data(const EVP_CIPHER_CTX *ctx);
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void *EVP_CIPHER_CTX_set_cipher_data(EVP_CIPHER_CTX *ctx, void *cipher_data);
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=head1 DESCRIPTION
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The EVP_CIPHER_CTX_get_cipher_data() function returns a pointer to the cipher
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data relevant to EVP_CIPHER_CTX. The contents of this data is specific to the
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particular implementation of the cipher. For example this data can be used by
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engines to store engine specific information. The data is automatically
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allocated and freed by OpenSSL, so applications and engines should not normally
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free this directly (but see below).
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The EVP_CIPHER_CTX_set_cipher_data() function allows an application or engine to
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replace the cipher data with new data. A pointer to any existing cipher data is
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returned from this function. If the old data is no longer required then it
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should be freed through a call to OPENSSL_free().
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=head1 RETURN VALUES
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The EVP_CIPHER_CTX_get_cipher_data() function returns a pointer to the current
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cipher data for the EVP_CIPHER_CTX.
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The EVP_CIPHER_CTX_set_cipher_data() function returns a pointer to the old
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cipher data for the EVP_CIPHER_CTX.
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=head1 HISTORY
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The EVP_CIPHER_CTX_get_cipher_data() and EVP_CIPHER_CTX_set_cipher_data()
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functions were added in OpenSSL 1.1.0.
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=head1 COPYRIGHT
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Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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