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<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>
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<h1><a name="name">NAME</a></h1>
<p>d2i_PrivateKey, d2i_PublicKey, d2i_AutoPrivateKey,
i2d_PrivateKey, i2d_PublicKey,
d2i_PrivateKey_bio, d2i_PrivateKey_fp
- decode and encode functions for reading and saving EVP_PKEY structures</p>
<p>
</p>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<pre>
#include <openssl/evp.h></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_AutoPrivateKey(EVP_PKEY **a, const unsigned char **pp,
long length);
int i2d_PrivateKey(EVP_PKEY *a, unsigned char **pp);
int i2d_PublicKey(EVP_PKEY *a, unsigned char **pp);</pre>
<pre>
EVP_PKEY *d2i_PrivateKey_bio(BIO *bp, EVP_PKEY **a);
EVP_PKEY *d2i_PrivateKey_fp(FILE *fp, EVP_PKEY **a)</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.</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.</p>
<p>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 the functions that operate on data in memory update the data pointer <em>*pp</em>
after a successful operation, just like the other d2i and i2d functions;
see <em>d2i_X509(3)</em>.</p>
<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(),
and d2i_PublicKey() 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() and i2d_PublicKey() 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 2017-2021 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>
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