104 lines
3.7 KiB
HTML
104 lines
3.7 KiB
HTML
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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_OpenInit</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:root@localhost" />
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</head>
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<body style="background-color: white">
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<!-- INDEX BEGIN -->
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<div name="index">
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<p><a name="__index__"></a></p>
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<ul>
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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="#see_also">SEE ALSO</a></li>
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<li><a href="#copyright">COPYRIGHT</a></li>
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</ul>
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<hr name="index" />
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</div>
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<!-- INDEX END -->
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<p>
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</p>
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<hr />
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<h1><a name="name">NAME</a></h1>
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<p>EVP_OpenInit, EVP_OpenUpdate, EVP_OpenFinal - EVP envelope decryption</p>
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<p>
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</p>
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<hr />
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<h1><a name="synopsis">SYNOPSIS</a></h1>
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<pre>
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#include <openssl/evp.h></pre>
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<pre>
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int EVP_OpenInit(EVP_CIPHER_CTX *ctx, EVP_CIPHER *type, unsigned char *ek,
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int ekl, unsigned char *iv, EVP_PKEY *priv);
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int EVP_OpenUpdate(EVP_CIPHER_CTX *ctx, unsigned char *out,
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int *outl, unsigned char *in, int inl);
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int EVP_OpenFinal(EVP_CIPHER_CTX *ctx, unsigned char *out, int *outl);</pre>
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<p>
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</p>
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<hr />
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<h1><a name="description">DESCRIPTION</a></h1>
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<p>The EVP envelope routines are a high level interface to envelope
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decryption. They decrypt a public key encrypted symmetric key and
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then decrypt data using it.</p>
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<p><code>EVP_OpenInit()</code> initializes a cipher context <strong>ctx</strong> for decryption
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with cipher <strong>type</strong>. It decrypts the encrypted symmetric key of length
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<strong>ekl</strong> bytes passed in the <strong>ek</strong> parameter using the private key <strong>priv</strong>.
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The IV is supplied in the <strong>iv</strong> parameter.</p>
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<p><code>EVP_OpenUpdate()</code> and <code>EVP_OpenFinal()</code> have exactly the same properties
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as the <code>EVP_DecryptUpdate()</code> and <code>EVP_DecryptFinal()</code> routines, as
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documented on the <em>EVP_EncryptInit(3)</em> manual
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page.</p>
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<p>
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</p>
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<hr />
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<h1><a name="notes">NOTES</a></h1>
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<p>It is possible to call <code>EVP_OpenInit()</code> twice in the same way as
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<code>EVP_DecryptInit()</code>. The first call should have <strong>priv</strong> set to NULL
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and (after setting any cipher parameters) it should be called again
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with <strong>type</strong> set to NULL.</p>
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<p>If the cipher passed in the <strong>type</strong> parameter is a variable length
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cipher then the key length will be set to the value of the recovered
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key length. If the cipher is a fixed length cipher then the recovered
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key length must match the fixed cipher length.</p>
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<p>
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</p>
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<hr />
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<h1><a name="return_values">RETURN VALUES</a></h1>
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<p><code>EVP_OpenInit()</code> returns 0 on error or a non zero integer (actually the
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recovered secret key size) if successful.</p>
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<p><code>EVP_OpenUpdate()</code> returns 1 for success or 0 for failure.</p>
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<p><code>EVP_OpenFinal()</code> returns 0 if the decrypt failed or 1 for success.</p>
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<p>
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</p>
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<hr />
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<h1><a name="see_also">SEE ALSO</a></h1>
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<p><em>evp(7)</em>, <em>RAND_bytes(3)</em>,
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<em>EVP_EncryptInit(3)</em>,
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<em>EVP_SealInit(3)</em></p>
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<p>
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</p>
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<hr />
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<h1><a name="copyright">COPYRIGHT</a></h1>
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<p>Copyright 2000-2016 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
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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<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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