1EVP_MD_METH_NEW(3) OpenSSL EVP_MD_METH_NEW(3)
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6 EVP_MD_meth_dup, EVP_MD_meth_new, EVP_MD_meth_free,
7 EVP_MD_meth_set_input_blocksize, EVP_MD_meth_set_result_size,
8 EVP_MD_meth_set_app_datasize, EVP_MD_meth_set_flags,
9 EVP_MD_meth_set_init, EVP_MD_meth_set_update, EVP_MD_meth_set_final,
10 EVP_MD_meth_set_copy, EVP_MD_meth_set_cleanup, EVP_MD_meth_set_ctrl,
11 EVP_MD_meth_get_input_blocksize, EVP_MD_meth_get_result_size,
12 EVP_MD_meth_get_app_datasize, EVP_MD_meth_get_flags,
13 EVP_MD_meth_get_init, EVP_MD_meth_get_update, EVP_MD_meth_get_final,
14 EVP_MD_meth_get_copy, EVP_MD_meth_get_cleanup, EVP_MD_meth_get_ctrl -
15 Routines to build up EVP_MD methods
16
18 #include <openssl/evp.h>
19 EVP_MD *EVP_MD_meth_new(int md_type, int pkey_type);
21 void EVP_MD_meth_free(EVP_MD *md);
22 EVP_MD *EVP_MD_meth_dup(const EVP_MD *md);
23 int EVP_MD_meth_set_input_blocksize(EVP_MD *md, int blocksize);
25 int EVP_MD_meth_set_result_size(EVP_MD *md, int resultsize);
26 int EVP_MD_meth_set_app_datasize(EVP_MD *md, int datasize);
27 int EVP_MD_meth_set_flags(EVP_MD *md, unsigned long flags);
28 int EVP_MD_meth_set_init(EVP_MD *md, int (*init)(EVP_MD_CTX *ctx));
29 int EVP_MD_meth_set_update(EVP_MD *md, int (*update)(EVP_MD_CTX *ctx,
30 const void *data,
31 size_t count));
32 int EVP_MD_meth_set_final(EVP_MD *md, int (*final)(EVP_MD_CTX *ctx,
33 unsigned char *md));
34 int EVP_MD_meth_set_copy(EVP_MD *md, int (*copy)(EVP_MD_CTX *to,
35 const EVP_MD_CTX *from));
36 int EVP_MD_meth_set_cleanup(EVP_MD *md, int (*cleanup)(EVP_MD_CTX *ctx));
37 int EVP_MD_meth_set_ctrl(EVP_MD *md, int (*ctrl)(EVP_MD_CTX *ctx, int cmd,
38 int p1, void *p2));
39 int EVP_MD_meth_get_input_blocksize(const EVP_MD *md);
41 int EVP_MD_meth_get_result_size(const EVP_MD *md);
42 int EVP_MD_meth_get_app_datasize(const EVP_MD *md);
43 unsigned long EVP_MD_meth_get_flags(const EVP_MD *md);
44 int (*EVP_MD_meth_get_init(const EVP_MD *md))(EVP_MD_CTX *ctx);
45 int (*EVP_MD_meth_get_update(const EVP_MD *md))(EVP_MD_CTX *ctx,
46 const void *data,
47 size_t count);
48 int (*EVP_MD_meth_get_final(const EVP_MD *md))(EVP_MD_CTX *ctx,
49 unsigned char *md);
50 int (*EVP_MD_meth_get_copy(const EVP_MD *md))(EVP_MD_CTX *to,
51 const EVP_MD_CTX *from);
52 int (*EVP_MD_meth_get_cleanup(const EVP_MD *md))(EVP_MD_CTX *ctx);
53 int (*EVP_MD_meth_get_ctrl(const EVP_MD *md))(EVP_MD_CTX *ctx, int cmd,
54 int p1, void *p2);
55
57 The EVP_MD type is a structure for digest method implementation. It
58 can also have associated public/private key signing and verifying
59 routines.
60 EVP_MD_meth_new() creates a new EVP_MD structure.
62 EVP_MD_meth_dup() creates a copy of md.
64 EVP_MD_meth_free() destroys a EVP_MD structure.
66 EVP_MD_meth_set_input_blocksize() sets the internal input block size
68 for the method md to blocksize bytes.
69 EVP_MD_meth_set_result_size() sets the size of the result that the
71 digest method in md is expected to produce to resultsize bytes.
72 The digest method may have its own private data, which OpenSSL will
74 allocate for it. EVP_MD_meth_set_app_datasize() should be used to set
75 the size for it to datasize.
76 EVP_MD_meth_set_flags() sets the flags to describe optional behaviours
78 in the particular md. Several flags can be or'd together. The
79 available flags are:
80 EVP_MD_FLAG_ONESHOT
82 This digest method can only handles one block of input.
83 EVP_MD_FLAG_DIGALGID_NULL
85 When setting up a DigestAlgorithmIdentifier, this flag will have
86 the parameter set to NULL by default. Use this for PKCS#1. Note:
87 if combined with EVP_MD_FLAG_DIGALGID_ABSENT, the latter will
88 override.
89 EVP_MD_FLAG_DIGALGID_ABSENT
91 When setting up a DigestAlgorithmIdentifier, this flag will have
92 the parameter be left absent by default. Note: if combined with
93 EVP_MD_FLAG_DIGALGID_NULL, the latter will be overridden.
94 EVP_MD_FLAG_DIGALGID_CUSTOM
96 Custom DigestAlgorithmIdentifier handling via ctrl, with
97 EVP_MD_FLAG_DIGALGID_ABSENT as default. Note: if combined with
98 EVP_MD_FLAG_DIGALGID_NULL, the latter will be overridden.
99 Currently unused.
100 EVP_MD_meth_set_init() sets the digest init function for md. The
102 digest init function is called by EVP_DigestInit(),
103 EVP_DigestInit_ex(), EVP_SignInit, EVP_SignInit_ex(), EVP_VerifyInit()
104 and EVP_VerifyInit_ex().
105 EVP_MD_meth_set_update() sets the digest update function for md. The
107 digest update function is called by EVP_DigestUpdate(),
108 EVP_SignUpdate().
109 EVP_MD_meth_set_final() sets the digest final function for md. The
111 digest final function is called by EVP_DigestFinal(),
112 EVP_DigestFinal_ex(), EVP_SignFinal() and EVP_VerifyFinal().
113 EVP_MD_meth_set_copy() sets the function for md to do extra
115 computations after the method's private data structure has been copied
116 from one EVP_MD_CTX to another. If all that's needed is to copy the
117 data, there is no need for this copy function. Note that the copy
118 function is passed two EVP_MD_CTX *, the private data structure is then
119 available with EVP_MD_CTX_md_data(). This copy function is called by
120 EVP_MD_CTX_copy() and EVP_MD_CTX_copy_ex().
121 EVP_MD_meth_set_cleanup() sets the function for md to do extra cleanup
123 before the method's private data structure is cleaned out and freed.
124 Note that the cleanup function is passed a EVP_MD_CTX *, the private
125 data structure is then available with EVP_MD_CTX_md_data(). This
126 cleanup function is called by EVP_MD_CTX_reset() and EVP_MD_CTX_free().
127 EVP_MD_meth_set_ctrl() sets the control function for md.
129 EVP_MD_meth_get_input_blocksize(), EVP_MD_meth_get_result_size(),
131 EVP_MD_meth_get_app_datasize(), EVP_MD_meth_get_flags(),
132 EVP_MD_meth_get_init(), EVP_MD_meth_get_update(),
133 EVP_MD_meth_get_final(), EVP_MD_meth_get_copy(),
134 EVP_MD_meth_get_cleanup() and EVP_MD_meth_get_ctrl() are all used to
135 retrieve the method data given with the EVP_MD_meth_set_*() functions
136 above.
137
139 EVP_MD_meth_new() and EVP_MD_meth_dup() return a pointer to a newly
140 created EVP_MD, or NULL on failure. All EVP_MD_meth_set_*() functions
141 return 1. EVP_MD_get_input_blocksize(), EVP_MD_meth_get_result_size(),
142 EVP_MD_meth_get_app_datasize() and EVP_MD_meth_get_flags() return the
143 indicated sizes or flags. All other EVP_CIPHER_meth_get_*() functions
144 return pointers to their respective md function.
145
147 EVP_DigestInit(3), EVP_SignInit(3), EVP_VerifyInit(3)
148
150 The EVP_MD structure was openly available in OpenSSL before version
151 1.1. The functions described here were added in OpenSSL 1.1.
152
154 Copyright 2015-2017 The OpenSSL Project Authors. All Rights Reserved.
155 Licensed under the OpenSSL license (the "License"). You may not use
157 this file except in compliance with the License. You can obtain a copy
158 in the file LICENSE in the source distribution or at
159 <https://www.openssl.org/source/license.html>.
1601.1.1d 2019-10-03 EVP_MD_METH_NEW(3)