Manual Page Result
0
Command: BIO_f_base64 | Section: 3 | Source: OpenBSD | File: BIO_f_base64.3
BIO_F_BASE64(3) FreeBSD Library Functions Manual 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(3) or BIO_puts(3).
BIO_flush(3) 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.
To encode the data all on one line and to expect the data to be all on
one line, initialize the base64 BIO as follows:
BIO *b64 = BIO_new(BIO_f_base64());
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
RETURN VALUES
BIO_f_base64() returns the base64 BIO method.
When called on a base64 BIO object, BIO_method_type(3) returns the
constant BIO_TYPE_BASE64 and BIO_method_name(3) returns a pointer to the
static string "base64 encoding".
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);
SEE ALSO
BIO_new(3), EVP_EncodeInit(3)
HISTORY
BIO_f_base64() first appeared in SSLeay 0.6.5 and has been available
since OpenBSD 2.4.
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).
FreeBSD 14.1-RELEASE-p8 September 11, 2023 FreeBSD 14.1-RELEASE-p8