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<!-- INDEX BEGIN -->
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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="#examples">EXAMPLES</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>

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<p>
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<hr />
<h1><a name="name">NAME</a></h1>
<p>EVP_PKEY_decrypt_init, EVP_PKEY_decrypt - decrypt using a public key algorithm</p>
<p>
</p>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<pre>
 #include &lt;openssl/evp.h&gt;</pre>
<pre>
 int EVP_PKEY_decrypt_init(EVP_PKEY_CTX *ctx);
 int EVP_PKEY_decrypt(EVP_PKEY_CTX *ctx,
                      unsigned char *out, size_t *outlen,
                      const unsigned char *in, size_t inlen);</pre>
<p>
</p>
<hr />
<h1><a name="description">DESCRIPTION</a></h1>
<p>The <code>EVP_PKEY_decrypt_init()</code> function initializes a public key algorithm
context using key <strong>pkey</strong> for a decryption operation.</p>
<p>The <code>EVP_PKEY_decrypt()</code> function performs a public key decryption operation
using <strong>ctx</strong>. The data to be decrypted is specified using the <strong>in</strong> and
<strong>inlen</strong> parameters. If <strong>out</strong> is <strong>NULL</strong> then the maximum size of the output
buffer is written to the <strong>outlen</strong> parameter. If <strong>out</strong> is not <strong>NULL</strong> then
before the call the <strong>outlen</strong> parameter should contain the length of the
<strong>out</strong> buffer, if the call is successful the decrypted data is written to
<strong>out</strong> and the amount of data written to <strong>outlen</strong>.</p>
<p>
</p>
<hr />
<h1><a name="notes">NOTES</a></h1>
<p>After the call to <code>EVP_PKEY_decrypt_init()</code> algorithm specific control
operations can be performed to set any appropriate parameters for the
operation.</p>
<p>The function <code>EVP_PKEY_decrypt()</code> can be called more than once on the same
context if several operations are performed using the same parameters.</p>
<p>
</p>
<hr />
<h1><a name="return_values">RETURN VALUES</a></h1>
<p><code>EVP_PKEY_decrypt_init()</code> and <code>EVP_PKEY_decrypt()</code> 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>
<p>
</p>
<hr />
<h1><a name="examples">EXAMPLES</a></h1>
<p>Decrypt data using OAEP (for RSA keys):</p>
<pre>
 #include &lt;openssl/evp.h&gt;
 #include &lt;openssl/rsa.h&gt;</pre>
<pre>
 EVP_PKEY_CTX *ctx;
 ENGINE *eng;
 unsigned char *out, *in;
 size_t outlen, inlen;
 EVP_PKEY *key;</pre>
<pre>
 /*
  * NB: assumes key, eng, in, inlen are already set up
  * and that key is an RSA private key
  */
 ctx = EVP_PKEY_CTX_new(key, eng);
 if (!ctx)
     /* Error occurred */
 if (EVP_PKEY_decrypt_init(ctx) &lt;= 0)
     /* Error */
 if (EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_OAEP_PADDING) &lt;= 0)
     /* Error */</pre>
<pre>
 /* Determine buffer length */
 if (EVP_PKEY_decrypt(ctx, NULL, &amp;outlen, in, inlen) &lt;= 0)
     /* Error */</pre>
<pre>
 out = OPENSSL_malloc(outlen);</pre>
<pre>
 if (!out)
     /* malloc failure */</pre>
<pre>
 if (EVP_PKEY_decrypt(ctx, out, &amp;outlen, in, inlen) &lt;= 0)
     /* Error */</pre>
<pre>
 /* Decrypted data is outlen bytes written to buffer out */</pre>
<p>
</p>
<hr />
<h1><a name="see_also">SEE ALSO</a></h1>
<p><em>EVP_PKEY_CTX_new(3)</em>,
<em>EVP_PKEY_encrypt(3)</em>,
<em>EVP_PKEY_sign(3)</em>,
<em>EVP_PKEY_verify(3)</em>,
<em>EVP_PKEY_verify_recover(3)</em>,
<em>EVP_PKEY_derive(3)</em></p>
<p>
</p>
<hr />
<h1><a name="history">HISTORY</a></h1>
<p>These functions were added in OpenSSL 1.0.0.</p>
<p>
</p>
<hr />
<h1><a name="copyright">COPYRIGHT</a></h1>
<p>Copyright 2006-2019 The OpenSSL Project Authors. All Rights Reserved.</p>
<p>Licensed under the OpenSSL license (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>

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