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There was recently an instance where a user was confused by the deprecation warnings in the docs. They believed the warning applied to the immediately preceding function declarations, when it fact it applied to the following function declarations. https://mta.openssl.org/pipermail/openssl-users/2021-December/014665.html We clarify the wording to make it clear that the warning applies to the following functions. Reviewed-by: Paul Dale <pauli@openssl.org> Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/17180)
205 lines
8.0 KiB
Plaintext
205 lines
8.0 KiB
Plaintext
=pod
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=head1 NAME
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EVP_MD_meth_new, EVP_MD_meth_dup, EVP_MD_meth_free,
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EVP_MD_meth_set_input_blocksize,
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EVP_MD_meth_set_result_size, EVP_MD_meth_set_app_datasize,
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EVP_MD_meth_set_flags, EVP_MD_meth_set_init, EVP_MD_meth_set_update,
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EVP_MD_meth_set_final, EVP_MD_meth_set_copy, EVP_MD_meth_set_cleanup,
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EVP_MD_meth_set_ctrl, EVP_MD_meth_get_input_blocksize,
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EVP_MD_meth_get_result_size, EVP_MD_meth_get_app_datasize,
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EVP_MD_meth_get_flags, EVP_MD_meth_get_init, EVP_MD_meth_get_update,
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EVP_MD_meth_get_final, EVP_MD_meth_get_copy, EVP_MD_meth_get_cleanup,
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EVP_MD_meth_get_ctrl
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- Routines to build up legacy EVP_MD methods
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=head1 SYNOPSIS
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#include <openssl/evp.h>
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The following functions have been deprecated since OpenSSL 3.0, and can be
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hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
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see L<openssl_user_macros(7)>:
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EVP_MD *EVP_MD_meth_new(int md_type, int pkey_type);
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void EVP_MD_meth_free(EVP_MD *md);
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EVP_MD *EVP_MD_meth_dup(const EVP_MD *md);
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int EVP_MD_meth_set_input_blocksize(EVP_MD *md, int blocksize);
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int EVP_MD_meth_set_result_size(EVP_MD *md, int resultsize);
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int EVP_MD_meth_set_app_datasize(EVP_MD *md, int datasize);
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int EVP_MD_meth_set_flags(EVP_MD *md, unsigned long flags);
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int EVP_MD_meth_set_init(EVP_MD *md, int (*init)(EVP_MD_CTX *ctx));
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int EVP_MD_meth_set_update(EVP_MD *md, int (*update)(EVP_MD_CTX *ctx,
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const void *data,
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size_t count));
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int EVP_MD_meth_set_final(EVP_MD *md, int (*final)(EVP_MD_CTX *ctx,
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unsigned char *md));
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int EVP_MD_meth_set_copy(EVP_MD *md, int (*copy)(EVP_MD_CTX *to,
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const EVP_MD_CTX *from));
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int EVP_MD_meth_set_cleanup(EVP_MD *md, int (*cleanup)(EVP_MD_CTX *ctx));
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int EVP_MD_meth_set_ctrl(EVP_MD *md, int (*ctrl)(EVP_MD_CTX *ctx, int cmd,
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int p1, void *p2));
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int EVP_MD_meth_get_input_blocksize(const EVP_MD *md);
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int EVP_MD_meth_get_result_size(const EVP_MD *md);
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int EVP_MD_meth_get_app_datasize(const EVP_MD *md);
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unsigned long EVP_MD_meth_get_flags(const EVP_MD *md);
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int (*EVP_MD_meth_get_init(const EVP_MD *md))(EVP_MD_CTX *ctx);
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int (*EVP_MD_meth_get_update(const EVP_MD *md))(EVP_MD_CTX *ctx,
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const void *data,
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size_t count);
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int (*EVP_MD_meth_get_final(const EVP_MD *md))(EVP_MD_CTX *ctx,
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unsigned char *md);
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int (*EVP_MD_meth_get_copy(const EVP_MD *md))(EVP_MD_CTX *to,
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const EVP_MD_CTX *from);
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int (*EVP_MD_meth_get_cleanup(const EVP_MD *md))(EVP_MD_CTX *ctx);
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int (*EVP_MD_meth_get_ctrl(const EVP_MD *md))(EVP_MD_CTX *ctx, int cmd,
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int p1, void *p2);
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=head1 DESCRIPTION
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All of the functions described on this page are deprecated.
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Applications should instead use the OSSL_PROVIDER APIs.
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The B<EVP_MD> type is a structure for digest method implementation.
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It can also have associated public/private key signing and verifying
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routines.
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EVP_MD_meth_new() creates a new B<EVP_MD> structure.
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These B<EVP_MD> structures are reference counted.
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EVP_MD_meth_dup() creates a copy of B<md>.
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EVP_MD_meth_free() decrements the reference count for the B<EVP_MD> structure.
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If the reference count drops to 0 then the structure is freed.
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EVP_MD_meth_set_input_blocksize() sets the internal input block size
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for the method B<md> to B<blocksize> bytes.
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EVP_MD_meth_set_result_size() sets the size of the result that the
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digest method in B<md> is expected to produce to B<resultsize> bytes.
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The digest method may have its own private data, which OpenSSL will
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allocate for it. EVP_MD_meth_set_app_datasize() should be used to
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set the size for it to B<datasize>.
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EVP_MD_meth_set_flags() sets the flags to describe optional
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behaviours in the particular B<md>. Several flags can be or'd
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together. The available flags are:
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=over 4
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=item EVP_MD_FLAG_ONESHOT
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This digest method can only handle one block of input.
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=item EVP_MD_FLAG_XOF
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This digest method is an extensible-output function (XOF) and supports
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the B<EVP_MD_CTRL_XOF_LEN> control.
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=item EVP_MD_FLAG_DIGALGID_NULL
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When setting up a DigestAlgorithmIdentifier, this flag will have the
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parameter set to NULL by default. Use this for PKCS#1. I<Note: if
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combined with EVP_MD_FLAG_DIGALGID_ABSENT, the latter will override.>
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=item EVP_MD_FLAG_DIGALGID_ABSENT
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When setting up a DigestAlgorithmIdentifier, this flag will have the
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parameter be left absent by default. I<Note: if combined with
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EVP_MD_FLAG_DIGALGID_NULL, the latter will be overridden.>
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=item EVP_MD_FLAG_DIGALGID_CUSTOM
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Custom DigestAlgorithmIdentifier handling via ctrl, with
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B<EVP_MD_FLAG_DIGALGID_ABSENT> as default. I<Note: if combined with
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EVP_MD_FLAG_DIGALGID_NULL, the latter will be overridden.>
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Currently unused.
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=item EVP_MD_FLAG_FIPS
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This digest method is suitable for use in FIPS mode.
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Currently unused.
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=back
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EVP_MD_meth_set_init() sets the digest init function for B<md>.
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The digest init function is called by EVP_Digest(), EVP_DigestInit(),
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EVP_DigestInit_ex(), EVP_SignInit, EVP_SignInit_ex(), EVP_VerifyInit()
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and EVP_VerifyInit_ex().
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EVP_MD_meth_set_update() sets the digest update function for B<md>.
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The digest update function is called by EVP_Digest(), EVP_DigestUpdate() and
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EVP_SignUpdate().
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EVP_MD_meth_set_final() sets the digest final function for B<md>.
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The digest final function is called by EVP_Digest(), EVP_DigestFinal(),
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EVP_DigestFinal_ex(), EVP_SignFinal() and EVP_VerifyFinal().
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EVP_MD_meth_set_copy() sets the function for B<md> to do extra
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computations after the method's private data structure has been copied
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from one B<EVP_MD_CTX> to another. If all that's needed is to copy
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the data, there is no need for this copy function.
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Note that the copy function is passed two B<EVP_MD_CTX *>, the private
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data structure is then available with EVP_MD_CTX_get0_md_data().
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This copy function is called by EVP_MD_CTX_copy() and
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EVP_MD_CTX_copy_ex().
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EVP_MD_meth_set_cleanup() sets the function for B<md> to do extra
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cleanup before the method's private data structure is cleaned out and
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freed.
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Note that the cleanup function is passed a B<EVP_MD_CTX *>, the
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private data structure is then available with EVP_MD_CTX_get0_md_data().
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This cleanup function is called by EVP_MD_CTX_reset() and
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EVP_MD_CTX_free().
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EVP_MD_meth_set_ctrl() sets the control function for B<md>.
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See L<EVP_MD_CTX_ctrl(3)> for the available controls.
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EVP_MD_meth_get_input_blocksize(), EVP_MD_meth_get_result_size(),
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EVP_MD_meth_get_app_datasize(), EVP_MD_meth_get_flags(),
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EVP_MD_meth_get_init(), EVP_MD_meth_get_update(),
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EVP_MD_meth_get_final(), EVP_MD_meth_get_copy(),
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EVP_MD_meth_get_cleanup() and EVP_MD_meth_get_ctrl() are all used
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to retrieve the method data given with the EVP_MD_meth_set_*()
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functions above.
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=head1 RETURN VALUES
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EVP_MD_meth_new() and EVP_MD_meth_dup() return a pointer to a newly
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created B<EVP_MD>, or NULL on failure.
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All EVP_MD_meth_set_*() functions return 1.
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EVP_MD_get_input_blocksize(), EVP_MD_meth_get_result_size(),
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EVP_MD_meth_get_app_datasize() and EVP_MD_meth_get_flags() return the
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indicated sizes or flags.
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All other EVP_CIPHER_meth_get_*() functions return pointers to their
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respective B<md> function.
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=head1 SEE ALSO
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L<EVP_DigestInit(3)>, L<EVP_SignInit(3)>, L<EVP_VerifyInit(3)>
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=head1 HISTORY
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All of these functions were deprecated in OpenSSL 3.0.
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The B<EVP_MD> structure was openly available in OpenSSL before version
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1.1.
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The functions described here were added in OpenSSL 1.1.
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The B<EVP_MD> structure created with these functions became reference
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counted in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (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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