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BIO_F_BASE64(3)			    OpenSSL		       BIO_F_BASE64(3)

NAME
       BIO_f_base64 - base64 BIO filter

SYNOPSIS
	#include <openssl/bio.h>
	#include <openssl/evp.h>

	const BIO_METHOD *BIO_f_base64(void);

DESCRIPTION
       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.

       Base64 BIOs do not support BIO_gets() or	BIO_puts().

       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.

       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.

NOTES
       Because of the format of	base64 encoding	the end	of the encoded block
       cannot always be	reliably determined.

RETURN VALUES
       BIO_f_base64() returns the base64 BIO method.

EXAMPLES
       Base64 encode the string	"Hello World\n"	and write the result to
       standard	output:

	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);

       Read Base64 encoded data	from standard input and	write the decoded data
       to standard output:

	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);

BUGS
       The ambiguity of	EOF in base64 encoded data can cause additional	data
       following the base64 encoded block to be	misinterpreted.

       There should be some way	of specifying a	test that the BIO can perform
       to reliably determine EOF (for example a	MIME boundary).

COPYRIGHT
       Copyright 2000-2016 The OpenSSL Project Authors.	All Rights Reserved.

       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
       <https://www.openssl.org/source/license.html>.

1.1.1d				  2019-09-10		       BIO_F_BASE64(3)

NAME | SYNOPSIS | DESCRIPTION | NOTES | RETURN VALUES | EXAMPLES | BUGS | COPYRIGHT

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