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EVP_MD_meth_get_init.html
<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>EVP_MD_meth_new</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@localhost" /> </head> <body> <ul id="index"> <li><a href="#NAME">NAME</a></li> <li><a href="#SYNOPSIS">SYNOPSIS</a></li> <li><a href="#DESCRIPTION">DESCRIPTION</a></li> <li><a href="#RETURN-VALUES">RETURN VALUES</a></li> <li><a href="#SEE-ALSO">SEE ALSO</a></li> <li><a href="#HISTORY">HISTORY</a></li> <li><a href="#COPYRIGHT">COPYRIGHT</a></li> </ul> <h1 id="NAME">NAME</h1> <p>EVP_MD_meth_dup, EVP_MD_meth_new, EVP_MD_meth_free, EVP_MD_meth_set_input_blocksize, EVP_MD_meth_set_result_size, EVP_MD_meth_set_app_datasize, EVP_MD_meth_set_flags, EVP_MD_meth_set_init, EVP_MD_meth_set_update, EVP_MD_meth_set_final, EVP_MD_meth_set_copy, EVP_MD_meth_set_cleanup, EVP_MD_meth_set_ctrl, EVP_MD_meth_get_input_blocksize, EVP_MD_meth_get_result_size, EVP_MD_meth_get_app_datasize, EVP_MD_meth_get_flags, EVP_MD_meth_get_init, EVP_MD_meth_get_update, EVP_MD_meth_get_final, EVP_MD_meth_get_copy, EVP_MD_meth_get_cleanup, EVP_MD_meth_get_ctrl - Routines to build up EVP_MD methods</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/evp.h> 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);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>The <b>EVP_MD</b> type is a structure for digest method implementation. It can also have associated public/private key signing and verifying routines.</p> <p>EVP_MD_meth_new() creates a new <b>EVP_MD</b> structure.</p> <p>EVP_MD_meth_dup() creates a copy of <b>md</b>.</p> <p>EVP_MD_meth_free() destroys a <b>EVP_MD</b> structure.</p> <p>EVP_MD_meth_set_input_blocksize() sets the internal input block size for the method <b>md</b> to <b>blocksize</b> bytes.</p> <p>EVP_MD_meth_set_result_size() sets the size of the result that the digest method in <b>md</b> is expected to produce to <b>resultsize</b> bytes.</p> <p>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 <b>datasize</b>.</p> <p>EVP_MD_meth_set_flags() sets the flags to describe optional behaviours in the particular <b>md</b>. Several flags can be or'd together. The available flags are:</p> <dl> <dt id="EVP_MD_FLAG_ONESHOT">EVP_MD_FLAG_ONESHOT</dt> <dd> <p>This digest method can only handle one block of input.</p> </dd> <dt id="EVP_MD_FLAG_XOF">EVP_MD_FLAG_XOF</dt> <dd> <p>This digest method is an extensible-output function (XOF) and supports the <b>EVP_MD_CTRL_XOF_LEN</b> control.</p> </dd> <dt id="EVP_MD_FLAG_DIGALGID_NULL">EVP_MD_FLAG_DIGALGID_NULL</dt> <dd> <p>When setting up a DigestAlgorithmIdentifier, this flag will have the parameter set to NULL by default. Use this for PKCS#1. <i>Note: if combined with EVP_MD_FLAG_DIGALGID_ABSENT, the latter will override.</i></p> </dd> <dt id="EVP_MD_FLAG_DIGALGID_ABSENT">EVP_MD_FLAG_DIGALGID_ABSENT</dt> <dd> <p>When setting up a DigestAlgorithmIdentifier, this flag will have the parameter be left absent by default. <i>Note: if combined with EVP_MD_FLAG_DIGALGID_NULL, the latter will be overridden.</i></p> </dd> <dt id="EVP_MD_FLAG_DIGALGID_CUSTOM">EVP_MD_FLAG_DIGALGID_CUSTOM</dt> <dd> <p>Custom DigestAlgorithmIdentifier handling via ctrl, with <b>EVP_MD_FLAG_DIGALGID_ABSENT</b> as default. <i>Note: if combined with EVP_MD_FLAG_DIGALGID_NULL, the latter will be overridden.</i> Currently unused.</p> </dd> <dt id="EVP_MD_FLAG_FIPS">EVP_MD_FLAG_FIPS</dt> <dd> <p>This digest method is suitable for use in FIPS mode. Currently unused.</p> </dd> </dl> <p>EVP_MD_meth_set_init() sets the digest init function for <b>md</b>. The digest init function is called by EVP_Digest(), EVP_DigestInit(), EVP_DigestInit_ex(), EVP_SignInit, EVP_SignInit_ex(), EVP_VerifyInit() and EVP_VerifyInit_ex().</p> <p>EVP_MD_meth_set_update() sets the digest update function for <b>md</b>. The digest update function is called by EVP_Digest(), EVP_DigestUpdate() and EVP_SignUpdate().</p> <p>EVP_MD_meth_set_final() sets the digest final function for <b>md</b>. The digest final function is called by EVP_Digest(), EVP_DigestFinal(), EVP_DigestFinal_ex(), EVP_SignFinal() and EVP_VerifyFinal().</p> <p>EVP_MD_meth_set_copy() sets the function for <b>md</b> to do extra computations after the method's private data structure has been copied from one <b>EVP_MD_CTX</b> 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 <b>EVP_MD_CTX *</b>, the private data structure is then available with EVP_MD_CTX_md_data(). This copy function is called by EVP_MD_CTX_copy() and EVP_MD_CTX_copy_ex().</p> <p>EVP_MD_meth_set_cleanup() sets the function for <b>md</b> to do extra cleanup before the method's private data structure is cleaned out and freed. Note that the cleanup function is passed a <b>EVP_MD_CTX *</b>, the private data structure is then available with EVP_MD_CTX_md_data(). This cleanup function is called by EVP_MD_CTX_reset() and EVP_MD_CTX_free().</p> <p>EVP_MD_meth_set_ctrl() sets the control function for <b>md</b>. See <a href="../man3/EVP_MD_CTX_ctrl.html">EVP_MD_CTX_ctrl(3)</a> for the available controls.</p> <p>EVP_MD_meth_get_input_blocksize(), EVP_MD_meth_get_result_size(), EVP_MD_meth_get_app_datasize(), EVP_MD_meth_get_flags(), EVP_MD_meth_get_init(), EVP_MD_meth_get_update(), EVP_MD_meth_get_final(), EVP_MD_meth_get_copy(), EVP_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.</p> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>EVP_MD_meth_new() and EVP_MD_meth_dup() return a pointer to a newly created <b>EVP_MD</b>, or NULL on failure. All EVP_MD_meth_set_*() functions return 1. EVP_MD_get_input_blocksize(), EVP_MD_meth_get_result_size(), EVP_MD_meth_get_app_datasize() and EVP_MD_meth_get_flags() return the indicated sizes or flags. All other EVP_CIPHER_meth_get_*() functions return pointers to their respective <b>md</b> function.</p> <h1 id="SEE-ALSO">SEE ALSO</h1> <p><a href="../man3/EVP_DigestInit.html">EVP_DigestInit(3)</a>, <a href="../man3/EVP_SignInit.html">EVP_SignInit(3)</a>, <a href="../man3/EVP_VerifyInit.html">EVP_VerifyInit(3)</a></p> <h1 id="HISTORY">HISTORY</h1> <p>The <b>EVP_MD</b> structure was openly available in OpenSSL before version 1.1. The functions described here were added in OpenSSL 1.1.</p> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p> </body> </html>
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