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Title "EVP_MD_METH_NEW 3"
way too many mistakes in technical documents.
The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining \s-1OPENSSL_API_COMPAT\s0 with a suitable version value, see openssl_user_macros\|(7):
.Vb 3 EVP_MD *EVP_MD_meth_new(int md_type, int pkey_type); void EVP_MD_meth_free(EVP_MD *md); EVP_MD *EVP_MD_meth_dup(const EVP_MD *md); \& int EVP_MD_meth_set_input_blocksize(EVP_MD *md, int blocksize); int EVP_MD_meth_set_result_size(EVP_MD *md, int resultsize); int EVP_MD_meth_set_app_datasize(EVP_MD *md, int datasize); int EVP_MD_meth_set_flags(EVP_MD *md, unsigned long flags); int EVP_MD_meth_set_init(EVP_MD *md, int (*init)(EVP_MD_CTX *ctx)); int EVP_MD_meth_set_update(EVP_MD *md, int (*update)(EVP_MD_CTX *ctx, const void *data, size_t count)); int EVP_MD_meth_set_final(EVP_MD *md, int (*final)(EVP_MD_CTX *ctx, unsigned char *md)); int EVP_MD_meth_set_copy(EVP_MD *md, int (*copy)(EVP_MD_CTX *to, const EVP_MD_CTX *from)); int EVP_MD_meth_set_cleanup(EVP_MD *md, int (*cleanup)(EVP_MD_CTX *ctx)); int EVP_MD_meth_set_ctrl(EVP_MD *md, int (*ctrl)(EVP_MD_CTX *ctx, int cmd, int p1, void *p2)); \& int EVP_MD_meth_get_input_blocksize(const EVP_MD *md); int EVP_MD_meth_get_result_size(const EVP_MD *md); int EVP_MD_meth_get_app_datasize(const EVP_MD *md); unsigned long EVP_MD_meth_get_flags(const EVP_MD *md); int (*EVP_MD_meth_get_init(const EVP_MD *md))(EVP_MD_CTX *ctx); int (*EVP_MD_meth_get_update(const EVP_MD *md))(EVP_MD_CTX *ctx, const void *data, size_t count); int (*EVP_MD_meth_get_final(const EVP_MD *md))(EVP_MD_CTX *ctx, unsigned char *md); int (*EVP_MD_meth_get_copy(const EVP_MD *md))(EVP_MD_CTX *to, const EVP_MD_CTX *from); int (*EVP_MD_meth_get_cleanup(const EVP_MD *md))(EVP_MD_CTX *ctx); int (*EVP_MD_meth_get_ctrl(const EVP_MD *md))(EVP_MD_CTX *ctx, int cmd, int p1, void *p2); .Ve
The \s-1EVP_MD\s0 type is a structure for digest method implementation. It can also have associated public/private key signing and verifying routines.
\fBEVP_MD_meth_new() creates a new \s-1EVP_MD\s0 structure. These \s-1EVP_MD\s0 structures are reference counted.
\fBEVP_MD_meth_dup() creates a copy of md.
\fBEVP_MD_meth_free() decrements the reference count for the \s-1EVP_MD\s0 structure. If the reference count drops to 0 then the structure is freed.
\fBEVP_MD_meth_set_input_blocksize() sets the internal input block size for the method md to blocksize bytes.
\fBEVP_MD_meth_set_result_size() sets the size of the result that the digest method in md is expected to produce to resultsize bytes.
The digest method may have its own private data, which OpenSSL will allocate for it. EVP_MD_meth_set_app_datasize() should be used to set the size for it to datasize.
\fBEVP_MD_meth_set_flags() sets the flags to describe optional behaviours in the particular md. Several flags can be or'd together. The available flags are:
\fBEVP_MD_meth_set_init() sets the digest init function for md. The digest init function is called by EVP_Digest(), EVP_DigestInit(), \fBEVP_DigestInit_ex(), EVP_SignInit, EVP_SignInit_ex(), EVP_VerifyInit() and EVP_VerifyInit_ex().
\fBEVP_MD_meth_set_update() sets the digest update function for md. The digest update function is called by EVP_Digest(), EVP_DigestUpdate() and \fBEVP_SignUpdate().
\fBEVP_MD_meth_set_final() sets the digest final function for md. The digest final function is called by EVP_Digest(), EVP_DigestFinal(), \fBEVP_DigestFinal_ex(), EVP_SignFinal() and EVP_VerifyFinal().
\fBEVP_MD_meth_set_copy() sets the function for md to do extra computations after the method's private data structure has been copied from one \s-1EVP_MD_CTX\s0 to another. If all that's needed is to copy the data, there is no need for this copy function. Note that the copy function is passed two \s-1EVP_MD_CTX\s0 *, the private data structure is then available with EVP_MD_CTX_get0_md_data(). This copy function is called by EVP_MD_CTX_copy() and \fBEVP_MD_CTX_copy_ex().
\fBEVP_MD_meth_set_cleanup() sets the function for md to do extra cleanup before the method's private data structure is cleaned out and freed. Note that the cleanup function is passed a \s-1EVP_MD_CTX\s0 *, the private data structure is then available with EVP_MD_CTX_get0_md_data(). This cleanup function is called by EVP_MD_CTX_reset() and \fBEVP_MD_CTX_free().
\fBEVP_MD_meth_set_ctrl() sets the control function for md. See EVP_MD_CTX_ctrl\|(3) for the available controls.
\fBEVP_MD_meth_get_input_blocksize(), EVP_MD_meth_get_result_size(), \fBEVP_MD_meth_get_app_datasize(), EVP_MD_meth_get_flags(), \fBEVP_MD_meth_get_init(), EVP_MD_meth_get_update(), \fBEVP_MD_meth_get_final(), EVP_MD_meth_get_copy(), \fBEVP_MD_meth_get_cleanup() and EVP_MD_meth_get_ctrl() are all used to retrieve the method data given with the EVP_MD_meth_set_*() functions above.
The \s-1EVP_MD\s0 structure was openly available in OpenSSL before version 1.1. The functions described here were added in OpenSSL 1.1. The \s-1EVP_MD\s0 structure created with these functions became reference counted in OpenSSL 3.0.
Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.