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<ul id="index">
<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="#BUGS">BUGS</a></li>
<li><a href="#COPYRIGHT">COPYRIGHT</a></li>
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<h1 id="NAME">NAME</h1>
<p>BIO_f_base64 - base64 BIO filter</p>
<h1 id="SYNOPSIS">SYNOPSIS</h1>
<pre><code> #include <openssl/bio.h>
#include <openssl/evp.h>
const BIO_METHOD *BIO_f_base64(void);</code></pre>
<h1 id="DESCRIPTION">DESCRIPTION</h1>
<p>BIO_f_base64() returns the base64 BIO method. This is a filter BIO that base64 encodes any data written through it and decodes any data read through it.</p>
<p>Base64 BIOs do not support BIO_gets() or BIO_puts().</p>
<p>BIO_flush() on a base64 BIO that is being written through is used to signal that no more data is to be encoded: this is used to flush the final block through the BIO.</p>
<p>The flag BIO_FLAGS_BASE64_NO_NL can be set with BIO_set_flags() to encode the data all on one line or expect the data to be all on one line.</p>
<h1 id="NOTES">NOTES</h1>
<p>Because of the format of base64 encoding the end of the encoded block cannot always be reliably determined.</p>
<h1 id="RETURN-VALUES">RETURN VALUES</h1>
<p>BIO_f_base64() returns the base64 BIO method.</p>
<h1 id="EXAMPLES">EXAMPLES</h1>
<p>Base64 encode the string "Hello World\n" and write the result to standard output:</p>
<pre><code> BIO *bio, *b64;
char message[] = "Hello World \n";
b64 = BIO_new(BIO_f_base64());
bio = BIO_new_fp(stdout, BIO_NOCLOSE);
BIO_push(b64, bio);
BIO_write(b64, message, strlen(message));
BIO_flush(b64);
BIO_free_all(b64);</code></pre>
<p>Read Base64 encoded data from standard input and write the decoded data to standard output:</p>
<pre><code> BIO *bio, *b64, *bio_out;
char inbuf[512];
int inlen;
b64 = BIO_new(BIO_f_base64());
bio = BIO_new_fp(stdin, BIO_NOCLOSE);
bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
BIO_push(b64, bio);
while ((inlen = BIO_read(b64, inbuf, 512)) > 0)
BIO_write(bio_out, inbuf, inlen);
BIO_flush(bio_out);
BIO_free_all(b64);</code></pre>
<h1 id="BUGS">BUGS</h1>
<p>The ambiguity of EOF in base64 encoded data can cause additional data following the base64 encoded block to be misinterpreted.</p>
<p>There should be some way of specifying a test that the BIO can perform to reliably determine EOF (for example a MIME boundary).</p>
<h1 id="COPYRIGHT">COPYRIGHT</h1>
<p>Copyright 2000-2016 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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