6 EVP_MD_meth_new, EVP_MD_meth_free, EVP_MD_meth_set_input_blocksize,
7 EVP_MD_meth_set_result_size, EVP_MD_meth_set_app_datasize,
8 EVP_MD_meth_set_flags, EVP_MD_meth_set_init, EVP_MD_meth_set_update,
9 EVP_MD_meth_set_final, EVP_MD_meth_set_copy, EVP_MD_meth_set_cleanup,
10 EVP_MD_meth_set_ctrl, EVP_MD_meth_get_input_blocksize,
11 EVP_MD_meth_get_result_size, EVP_MD_meth_get_app_datasize,
12 EVP_MD_meth_get_flags, EVP_MD_meth_get_init, EVP_MD_meth_get_update,
13 EVP_MD_meth_get_final, EVP_MD_meth_get_copy, EVP_MD_meth_get_cleanup,
14 EVP_MD_meth_get_ctrl, EVP_MD_CTX_md_data
15 - Routines to build up EVP_MD methods
19 #include <openssl/evp.h>
21 EVP_MD *EVP_MD_meth_new(int md_type, int pkey_type);
22 void EVP_MD_meth_free(EVP_MD *md);
23 EVP_MD *EVP_MD_meth_dup(const EVP_MD *md);
25 int EVP_MD_meth_set_input_blocksize(EVP_MD *md, int blocksize);
26 int EVP_MD_meth_set_result_size(EVP_MD *md, int resultsize);
27 int EVP_MD_meth_set_app_datasize(EVP_MD *md, int datasize);
28 int EVP_MD_meth_set_flags(EVP_MD *md, unsigned long flags);
29 int EVP_MD_meth_set_init(EVP_MD *md, int (*init)(EVP_MD_CTX *ctx));
30 int EVP_MD_meth_set_update(EVP_MD *md, int (*update)(EVP_MD_CTX *ctx,
33 int EVP_MD_meth_set_final(EVP_MD *md, int (*final)(EVP_MD_CTX *ctx,
35 int EVP_MD_meth_set_copy(EVP_MD *md, int (*copy)(EVP_MD_CTX *to,
36 const EVP_MD_CTX *from));
37 void *EVP_MD_CTX_md_data(const EVP_MD_CTX *ctx);
38 int EVP_MD_meth_set_cleanup(EVP_MD *md, int (*cleanup)(EVP_MD_CTX *ctx));
39 int EVP_MD_meth_set_ctrl(EVP_MD *md, int (*ctrl)(EVP_MD_CTX *ctx, int cmd,
42 int EVP_MD_meth_get_input_blocksize(const EVP_MD *md);
43 int EVP_MD_meth_get_result_size(const EVP_MD *md);
44 int EVP_MD_meth_get_app_datasize(const EVP_MD *md);
45 unsigned long EVP_MD_meth_get_flags(const EVP_MD *md);
46 int (*EVP_MD_meth_get_init(const EVP_MD *md))(EVP_MD_CTX *ctx);
47 int (*EVP_MD_meth_get_update(const EVP_MD *md))(EVP_MD_CTX *ctx,
50 int (*EVP_MD_meth_get_final(const EVP_MD *md))(EVP_MD_CTX *ctx,
52 int (*EVP_MD_meth_get_copy(const EVP_MD *md))(EVP_MD_CTX *to,
53 const EVP_MD_CTX *from);
54 int (*EVP_MD_meth_get_cleanup(const EVP_MD *md))(EVP_MD_CTX *ctx);
55 int (*EVP_MD_meth_get_ctrl(const EVP_MD *md))(EVP_MD_CTX *ctx, int cmd,
60 The B<EVP_MD> type is a structure for digest method implementation.
61 It can also have associated public/private key signing and verifying
64 EVP_MD_meth_new() creates a new B<EVP_MD> structure.
66 EVP_MD_meth_dup() creates a copy of B<md>.
68 EVP_MD_meth_free() destroys a B<EVP_MD> structure.
70 EVP_MD_meth_set_input_blocksize() sets the internal input block size
71 for the method B<md> to B<blocksize> bytes.
73 EVP_MD_meth_set_result_size() sets the size of the result that the
74 digest method in B<md> is expected to produce to B<resultsize> bytes.
76 The digest method may have its own private data, which OpenSSL will
77 allocate for it. EVP_MD_meth_set_app_datasize() should be used to
78 set the size for it to B<datasize>.
80 EVP_MD_meth_set_flags() sets the flags to describe optional
81 behaviours in the particular B<md>. Several flags can be or'd
82 together. The available flags are:
86 =item EVP_MD_FLAG_ONESHOT
88 This digest method can only handles one block of input.
90 =item EVP_MD_FLAG_DIGALGID_NULL
92 When setting up a DigestAlgorithmIdentifier, this flag will have the
93 parameter set to NULL by default. Use this for PKCS#1. I<Note: if
94 combined with EVP_MD_FLAG_DIGALGID_ABSENT, the latter will override.>
96 =item EVP_MD_FLAG_DIGALGID_ABSENT
98 When setting up a DigestAlgorithmIdentifier, this flag will have the
99 parameter be left absent by default. I<Note: if combined with
100 EVP_MD_FLAG_DIGALGID_NULL, the latter will be overridden.>
102 =item EVP_MD_FLAG_DIGALGID_CUSTOM
104 Custom DigestAlgorithmIdentifier handling via ctrl, with
105 B<EVP_MD_FLAG_DIGALGID_ABSENT> as default. I<Note: if combined with
106 EVP_MD_FLAG_DIGALGID_NULL, the latter will be overridden.>
111 EVP_MD_meth_set_init() sets the digest init function for B<md>.
112 The digest init function is called by EVP_DigestInit(),
113 EVP_DigestInit_ex(), EVP_SignInit, EVP_SignInit_ex(), EVP_VerifyInit()
114 and EVP_VerifyInit_ex().
116 EVP_MD_meth_set_update() sets the digest update function for B<md>.
117 The digest update function is called by EVP_DigestUpdate(),
120 EVP_MD_meth_set_final() sets the digest final function for B<md>.
121 The digest final function is called by EVP_DigestFinal(),
122 EVP_DigestFinal_ex(), EVP_SignFinal() and EVP_VerifyFinal().
124 EVP_MD_meth_set_copy() sets the function for B<md> to do extra
125 computations after the method's private data structure has been copied
126 from one B<EVP_MD_CTX> to another. If all that's needed is to copy
127 the data, there is no need for this copy function.
128 Note that the copy function is passed two B<EVP_MD_CTX *>, the private
129 data structure is then available with EVP_MD_CTX_md_data().
130 This copy function is called by EVP_MD_CTX_copy() and
131 EVP_MD_CTX_copy_ex().
133 EVP_MD_meth_set_cleanup() sets the function for B<md> to do extra
134 cleanup before the method's private data structure is cleaned out and
136 Note that the cleanup function is passed a B<EVP_MD_CTX *>, the
137 private data structure is then available with EVP_MD_CTX_md_data().
138 This cleanup function is called by EVP_MD_CTX_reset() and
141 EVP_MD_meth_set_ctrl() sets the control function for B<md>.
144 EVP_MD_meth_get_input_blocksize(), EVP_MD_meth_get_result_size(),
145 EVP_MD_meth_get_app_datasize(), EVP_MD_meth_get_flags(),
146 EVP_MD_meth_get_init(), EVP_MD_meth_get_update(),
147 EVP_MD_meth_get_final(), EVP_MD_meth_get_copy(),
148 EVP_MD_meth_get_cleanup() and EVP_MD_meth_get_ctrl() are all used
149 to retrieve the method data given with the EVP_MD_meth_set_*()
154 L<EVP_DigestInit(3)>, L<EVP_SignInit(3)>, L<EVP_VerifyInit(3)>
158 The B<EVP_MD> structure was openly available in OpenSSL before version
159 1.1. The functions described here were added in OpenSSL version 1.1.
163 Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
165 Licensed under the OpenSSL license (the "License"). You may not use
166 this file except in compliance with the License. You can obtain a copy
167 in the file LICENSE in the source distribution or at
168 L<https://www.openssl.org/source/license.html>.