5 EVP_MD_meth_new, EVP_MD_meth_free, EVP_MD_meth_set_input_blocksize,
6 EVP_MD_meth_set_result_size, EVP_MD_meth_set_app_datasize,
7 EVP_MD_meth_set_flags, EVP_MD_meth_set_init, EVP_MD_meth_set_update,
8 EVP_MD_meth_set_final, EVP_MD_meth_set_copy, EVP_MD_meth_set_cleanup,
9 EVP_MD_meth_set_ctrl, EVP_MD_meth_get_input_blocksize,
10 EVP_MD_meth_get_result_size, EVP_MD_meth_get_app_datasize,
11 EVP_MD_meth_get_flags, EVP_MD_meth_get_init, EVP_MD_meth_get_update,
12 EVP_MD_meth_get_final, EVP_MD_meth_get_copy, EVP_MD_meth_get_cleanup,
13 EVP_MD_meth_get_ctrl, EVP_MD_meth_get_pkey_types,
14 EVP_MD_meth_get_sign, EVP_MD_meth_get_verify - Routines to build up
19 #include <openssl/evp.h>
21 EVP_MD *EVP_MD_create_method(int md_type, int pkey_type);
22 EVP_MD *EVP_MD_meth_dup(const EVP_MD *md);
23 void EVP_MD_destroy_method(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 int EVP_MD_meth_set_cleanup(EVP_MD *md, int (*cleanup)(EVP_MD_CTX *ctx));
38 int EVP_MD_meth_set_ctrl(EVP_MD *md, int (*ctrl)(EVP_MD_CTX *ctx, int cmd,
41 int EVP_MD_meth_get_input_blocksize(const EVP_MD *md);
42 int EVP_MD_meth_get_result_size(const EVP_MD *md);
43 int EVP_MD_meth_get_app_datasize(const EVP_MD *md);
44 unsigned long EVP_MD_meth_get_flags(const EVP_MD *md);
45 int (*EVP_MD_meth_get_init(const EVP_MD *md))(EVP_MD_CTX *ctx);
46 int (*EVP_MD_meth_get_update(const EVP_MD *md))(EVP_MD_CTX *ctx,
49 int (*EVP_MD_meth_get_final(const EVP_MD *md))(EVP_MD_CTX *ctx,
51 int (*EVP_MD_meth_get_copy(const EVP_MD *md))(EVP_MD_CTX *to,
52 const EVP_MD_CTX *from);
53 int (*EVP_MD_meth_get_cleanup(const EVP_MD *md))(EVP_MD_CTX *ctx);
54 int (*EVP_MD_meth_get_ctrl(const EVP_MD *md))(EVP_MD_CTX *ctx, int cmd,
59 The B<EVP_MD> type is a structure for digest method implementation.
60 It can also have associated public/private key signing and verifying
63 EVP_MD_meth_new() creates a new B<EVP_MD> structure.
65 EVP_MD_meth_dup() creates a copy of B<md>.
67 EVP_MD_meth_free() destroys a B<EVP_MD> structure.
69 EVP_MD_meth_set_input_blocksize() sets the internal input block size
70 for the method B<md> to B<blocksize> bytes.
72 EVP_MD_meth_set_result_size() sets the size of the result that the
73 digest method in B<md> is expected to produce to B<resultsize> bytes.
75 The digest method may have its own private data, which OpenSSL will
76 allocate for it. EVP_MD_meth_set_app_datasize() should be used to
77 set the size for it to B<datasize>.
79 EVP_MD_meth_set_flags() sets the flags to describe optional
80 behaviours in the particular B<md>. Several flags can be or'd
81 together. The available flags are:
85 =item EVP_MD_FLAG_ONESHOT
87 This digest method can only handles one block of input.
89 =item EVP_MD_FLAG_DIGALGID_NULL
91 When setting up a DigestAlgorithmIdentifier, this flag will have the
92 parameter set to NULL by default. Use this for PKCS#1. I<Note: if
93 combined with EVP_MD_FLAG_DIGALGID_ABSENT, the latter will override.>
95 =item EVP_MD_FLAG_DIGALGID_ABSENT
97 When setting up a DigestAlgorithmIdentifier, this flag will have the
98 parameter be left absent by default. I<Note: if combined with
99 EVP_MD_FLAG_DIGALGID_NULL, the latter will be overriden.>
101 =item EVP_MD_FLAG_DIGALGID_CUSTOM
103 Custom DigestAlgorithmIdentifier handling via ctrl, with
104 B<EVP_MD_FLAG_DIGALGID_ABSENT> as default. I<Note: if combined with
105 EVP_MD_FLAG_DIGALGID_NULL, the latter will be overriden.>
110 EVP_MD_meth_set_init() sets the digest init function for B<md>.
111 The digest init function is called by EVP_DigestInit(),
112 EVP_DigestInit_ex(), EVP_SignInit, EVP_SignInit_ex(), EVP_VerifyInit()
113 and EVP_VerifyInit_ex().
115 EVP_MD_meth_set_update() sets the digest update function for B<md>.
116 The digest update function is called by EVP_DigestUpdate(),
119 EVP_MD_meth_set_final() sets the digest final function for B<md>.
120 The digest final function is called by EVP_DigestFinal(),
121 EVP_DigestFinal_ex(), EVP_SignFinal() and EVP_VerifyFinal().
123 EVP_MD_meth_set_copy() sets the function for B<md> to do extra
124 computations after the method's private data structure has been copied
125 from one B<EVP_MD_CTX> to another. If all that's needed is to copy
126 the data, there is no need for this copy function.
127 Note that the copy function is passed two B<EVP_MD_CTX *>, the private
128 data structure is then available with EVP_MD_CTX_md_data().
129 This copy function is called by EVP_MD_CTX_copy() and
130 EVP_MD_CTX_copy_ex().
132 EVP_MD_meth_set_cleanup() sets the function for B<md> to do extra
133 cleanup before the method's privata data structure is cleaned out and
135 Note that the cleanup function is passed a B<EVP_MD_CTX *>, the
136 private data structure is then available with EVP_MD_CTX_md_data().
137 This cleanup function is called by EVP_MD_CTX_reset() and
140 EVP_MD_meth_set_ctrl() sets the control function for B<md>.
143 EVP_MD_meth_get_input_blocksize(), EVP_MD_meth_get_result_size(),
144 EVP_MD_meth_get_app_datasize(), EVP_MD_meth_get_flags(),
145 EVP_MD_meth_get_init(), EVP_MD_meth_get_update(),
146 EVP_MD_meth_get_final(), EVP_MD_meth_get_copy(),
147 EVP_MD_meth_get_cleanup() and EVP_MD_meth_get_ctrl() are all used
148 to retrieve the method data given with the EVP_MD_meth_set_*()
153 L<EVP_DigestInit(3)>, L<EVP_SignInit(3)>, L<EVP_VerifyInit(3)>
157 The B<EVP_MD> structure was openly available in OpenSSL before version
158 1.1. The functions described here were added in OpenSSL version 1.1.