117 lines
5.9 KiB
HTML
117 lines
5.9 KiB
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<?xml version="1.0" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>EVP_PKEY_encapsulate</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:" />
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</head>
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<body>
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<ul id="index">
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<li><a href="#NAME">NAME</a></li>
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<li><a href="#SYNOPSIS">SYNOPSIS</a></li>
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<li><a href="#DESCRIPTION">DESCRIPTION</a></li>
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<li><a href="#NOTES">NOTES</a></li>
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<li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
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<li><a href="#EXAMPLES">EXAMPLES</a></li>
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<li><a href="#SEE-ALSO">SEE ALSO</a></li>
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<li><a href="#HISTORY">HISTORY</a></li>
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<li><a href="#COPYRIGHT">COPYRIGHT</a></li>
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</ul>
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<h1 id="NAME">NAME</h1>
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<p>EVP_PKEY_encapsulate_init, EVP_PKEY_auth_encapsulate_init, EVP_PKEY_encapsulate - Key encapsulation using a KEM algorithm with a public key</p>
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<h1 id="SYNOPSIS">SYNOPSIS</h1>
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<pre><code> #include <openssl/evp.h>
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int EVP_PKEY_encapsulate_init(EVP_PKEY_CTX *ctx, const OSSL_PARAM params[]);
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int EVP_PKEY_auth_encapsulate_init(EVP_PKEY_CTX *ctx, EVP_PKEY *authpriv,
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const OSSL_PARAM params[]);
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int EVP_PKEY_encapsulate(EVP_PKEY_CTX *ctx,
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unsigned char *wrappedkey, size_t *wrappedkeylen,
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unsigned char *genkey, size_t *genkeylen);</code></pre>
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<h1 id="DESCRIPTION">DESCRIPTION</h1>
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<p>The EVP_PKEY_encapsulate_init() function initializes a public key algorithm context <i>ctx</i> for an encapsulation operation and then sets the <i>params</i> on the context in the same way as calling <a href="../man3/EVP_PKEY_CTX_set_params.html">EVP_PKEY_CTX_set_params(3)</a>. Note that <i>ctx</i> is usually is produced using <a href="../man3/EVP_PKEY_CTX_new_from_pkey.html">EVP_PKEY_CTX_new_from_pkey(3)</a>, specifying the public key to use.</p>
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<p>The EVP_PKEY_auth_encapsulate_init() function is similar to EVP_PKEY_encapsulate_init() but also passes an <i>authpriv</i> authentication private key that is used during encapsulation.</p>
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<p>The EVP_PKEY_encapsulate() function performs a public key encapsulation operation using <i>ctx</i>. The symmetric secret generated in <i>genkey</i> can be used as key material. The ciphertext in <i>wrappedkey</i> is its encapsulated form, which can be sent to another party, who can use <a href="../man3/EVP_PKEY_decapsulate.html">EVP_PKEY_decapsulate(3)</a> to retrieve it using their private key. If <i>wrappedkey</i> is NULL then the maximum size of the output buffer is written to the <i>*wrappedkeylen</i> parameter unless <i>wrappedkeylen</i> is NULL and the maximum size of the generated key buffer is written to <i>*genkeylen</i> unless <i>genkeylen</i> is NULL. If <i>wrappedkey</i> is not NULL and the call is successful then the internally generated key is written to <i>genkey</i> and its size is written to <i>*genkeylen</i>. The encapsulated version of the generated key is written to <i>wrappedkey</i> and its size is written to <i>*wrappedkeylen</i>.</p>
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<h1 id="NOTES">NOTES</h1>
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<p>After the call to EVP_PKEY_encapsulate_init() algorithm-specific parameters for the operation may be set or modified using <a href="../man3/EVP_PKEY_CTX_set_params.html">EVP_PKEY_CTX_set_params(3)</a>.</p>
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<h1 id="RETURN-VALUES">RETURN VALUES</h1>
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<p>EVP_PKEY_encapsulate_init(), EVP_PKEY_auth_encapsulate_init() and EVP_PKEY_encapsulate() return 1 for success and 0 or a negative value for failure. In particular a return value of -2 indicates the operation is not supported by the public key algorithm.</p>
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<h1 id="EXAMPLES">EXAMPLES</h1>
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<p>Encapsulate an RSASVE key (for RSA keys).</p>
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<pre><code> #include <openssl/evp.h>
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/*
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* NB: assumes rsa_pub_key is an public key of another party.
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*/
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EVP_PKEY_CTX *ctx = NULL;
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size_t secretlen = 0, outlen = 0;
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unsigned char *out = NULL, *secret = NULL;
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ctx = EVP_PKEY_CTX_new_from_pkey(libctx, rsa_pub_key, NULL);
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if (ctx = NULL)
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/* Error */
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if (EVP_PKEY_encapsulate_init(ctx, NULL) <= 0)
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/* Error */
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/* Set the mode - only 'RSASVE' is currently supported */
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if (EVP_PKEY_CTX_set_kem_op(ctx, "RSASVE") <= 0)
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/* Error */
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/* Determine buffer length */
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if (EVP_PKEY_encapsulate(ctx, NULL, &outlen, NULL, &secretlen) <= 0)
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/* Error */
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out = OPENSSL_malloc(outlen);
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secret = OPENSSL_malloc(secretlen);
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if (out == NULL || secret == NULL)
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/* malloc failure */
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/*
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* The generated 'secret' can be used as key material.
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* The encapsulated 'out' can be sent to another party who can
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* decapsulate it using their private key to retrieve the 'secret'.
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*/
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if (EVP_PKEY_encapsulate(ctx, out, &outlen, secret, &secretlen) <= 0)
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/* Error */</code></pre>
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<h1 id="SEE-ALSO">SEE ALSO</h1>
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<p><a href="../man3/EVP_PKEY_CTX_new_from_pkey.html">EVP_PKEY_CTX_new_from_pkey(3)</a>, <a href="../man3/EVP_PKEY_decapsulate.html">EVP_PKEY_decapsulate(3)</a>, <a href="../man7/EVP_KEM-RSA.html">EVP_KEM-RSA(7)</a>, <a href="../man7/EVP_KEM-X25519.html">EVP_KEM-X25519(7)</a>, <a href="../man7/EVP_KEM-EC.html">EVP_KEM-EC(7)</a></p>
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<h1 id="HISTORY">HISTORY</h1>
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<p>These functions EVP_PKEY_encapsulate_init() and EVP_PKEY_encapsulate() were added in OpenSSL 3.0. The function EVP_PKEY_auth_encapsulate_init() was added in OpenSSL 3.2.</p>
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<h1 id="COPYRIGHT">COPYRIGHT</h1>
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<p>Copyright 2020-2023 The OpenSSL Project Authors. All Rights Reserved.</p>
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<p>Licensed under the Apache License 2.0 (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>
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</body>
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</html>
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