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+<head>
+<title>d2i_PrivateKey</title>
+<meta http-equiv="content-type" content="text/html; charset=utf-8" />
+<link rev="made" href="mailto:root@localhost" />
+</head>
+
+<body style="background-color: white">
+
+
+<!-- INDEX BEGIN -->
+<div name="index">
+<p><a name="__index__"></a></p>
+
+<ul>
+
+	<li><a href="#name">NAME</a></li>
+	<li><a href="#synopsis">SYNOPSIS</a></li>
+	<li><a href="#description">DESCRIPTION</a></li>
+	<li><a href="#notes">NOTES</a></li>
+	<li><a href="#return_values">RETURN VALUES</a></li>
+	<li><a href="#see_also">SEE ALSO</a></li>
+	<li><a href="#copyright">COPYRIGHT</a></li>
+</ul>
+
+<hr name="index" />
+</div>
+<!-- INDEX END -->
+
+<p>
+</p>
+<hr />
+<h1><a name="name">NAME</a></h1>
+<p>d2i_PrivateKey, d2i_PublicKey, d2i_KeyParams, d2i_AutoPrivateKey,
+i2d_PrivateKey, i2d_PublicKey, i2d_KeyParams, i2d_KeyParams_bio,
+d2i_PrivateKey_bio, d2i_PrivateKey_fp, d2i_KeyParams_bio
+- decode and encode functions for reading and saving EVP_PKEY structures</p>
+<p>
+</p>
+<hr />
+<h1><a name="synopsis">SYNOPSIS</a></h1>
+<pre>
+ #include &lt;openssl/evp.h&gt;</pre>
+<pre>
+ EVP_PKEY *d2i_PrivateKey(int type, EVP_PKEY **a, const unsigned char **pp,
+                          long length);
+ EVP_PKEY *d2i_PublicKey(int type, EVP_PKEY **a, const unsigned char **pp,
+                         long length);
+ EVP_PKEY *d2i_KeyParams(int type, EVP_PKEY **a, const unsigned char **pp,
+                         long length);
+ EVP_PKEY *d2i_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
+                              long length);</pre>
+<pre>
+ int i2d_PrivateKey(const EVP_PKEY *a, unsigned char **pp);
+ int i2d_PublicKey(const EVP_PKEY *a, unsigned char **pp);
+ int i2d_KeyParams(const EVP_PKEY *a, unsigned char **pp);
+ int i2d_KeyParams_bio(BIO *bp, const EVP_PKEY *pkey);</pre>
+<pre>
+ EVP_PKEY *d2i_PrivateKey_bio(BIO *bp, EVP_PKEY **a);
+ EVP_PKEY *d2i_PrivateKey_fp(FILE *fp, EVP_PKEY **a)
+ EVP_PKEY *d2i_KeyParams_bio(int type, EVP_PKEY **a, BIO *in);</pre>
+<p>
+</p>
+<hr />
+<h1><a name="description">DESCRIPTION</a></h1>
+<p>d2i_PrivateKey() decodes a private key using algorithm <strong>type</strong>. It attempts to
+use any key specific format or PKCS#8 unencrypted PrivateKeyInfo format. The
+<strong>type</strong> parameter should be a public key algorithm constant such as
+<strong>EVP_PKEY_RSA</strong>. An error occurs if the decoded key does not match <strong>type</strong>.
+d2i_PublicKey() does the same for public keys.
+d2i_KeyParams() does the same for key parameters.</p>
+<p>d2i_AutoPrivateKey() is similar to d2i_PrivateKey() except it attempts to
+automatically detect the private key format.</p>
+<p>i2d_PrivateKey() encodes <strong>key</strong>. It uses a key specific format or, if none is
+defined for that key type, PKCS#8 unencrypted PrivateKeyInfo format.
+i2d_PublicKey() does the same for public keys.
+i2d_KeyParams() does the same for key parameters.
+These functions are similar to the d2i_X509() functions; see <em>d2i_X509(3)</em>.</p>
+<p>
+</p>
+<hr />
+<h1><a name="notes">NOTES</a></h1>
+<p>All these functions use DER format and unencrypted keys. Applications wishing
+to encrypt or decrypt private keys should use other functions such as
+d2i_PKCS8PrivateKey() instead.</p>
+<p>If the <strong>*a</strong> is not NULL when calling d2i_PrivateKey() or d2i_AutoPrivateKey()
+(i.e. an existing structure is being reused) and the key format is PKCS#8
+then <strong>*a</strong> will be freed and replaced on a successful call.</p>
+<p>To decode a key with type <strong>EVP_PKEY_EC</strong>, d2i_PublicKey() requires <strong>*a</strong> to be
+a non-NULL EVP_PKEY structure assigned an EC_KEY structure referencing the proper
+EC_GROUP.</p>
+<p>
+</p>
+<hr />
+<h1><a name="return_values">RETURN VALUES</a></h1>
+<p>The d2i_PrivateKey(), d2i_AutoPrivateKey(), d2i_PrivateKey_bio(), d2i_PrivateKey_fp(),
+d2i_PublicKey(), d2i_KeyParams() and d2i_KeyParams_bio() functions return a valid
+<strong>EVP_KEY</strong> structure or <strong>NULL</strong> if an error occurs. The error code can be
+obtained by calling <em>ERR_get_error(3)</em>.</p>
+<p>i2d_PrivateKey(), i2d_PublicKey(), i2d_KeyParams() i2d_KeyParams_bio() return
+the number of bytes successfully encoded or a negative value if an error occurs.
+The error code can be obtained by calling <em>ERR_get_error(3)</em>.</p>
+<p>
+</p>
+<hr />
+<h1><a name="see_also">SEE ALSO</a></h1>
+<p><em>crypto(7)</em>,
+<em>d2i_PKCS8PrivateKey_bio(3)</em></p>
+<p>
+</p>
+<hr />
+<h1><a name="copyright">COPYRIGHT</a></h1>
+<p>Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.</p>
+<p>Licensed under the Apache License 2.0 (the &quot;License&quot;).  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>