BIO_F_BASE64(3) OpenSSL BIO_F_BASE64(3)NAMEBIO_f_base64 - base64 BIO filter
SYNOPSIS
#include <openssl/bio.h>
#include <openssl/evp.h>
BIO_METHOD * BIO_f_base64(void);
DESCRIPTIONBIO_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 VALUESBIO_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 = BIO_push(b64, bio);
BIO_write(bio, message, strlen(message));
BIO_flush(bio);
BIO_free_all(bio);
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;
MirOS BSD #10-current 2005-02-05 1
BIO_F_BASE64(3) OpenSSL BIO_F_BASE64(3)
b64 = BIO_new(BIO_f_base64());
bio = BIO_new_fp(stdin, BIO_NOCLOSE);
bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
bio = BIO_push(b64, bio);
while((inlen = BIO_read(bio, inbuf, 512) > 0)
BIO_write(bio_out, inbuf, inlen);
BIO_free_all(bio);
BUGS
The ambiguity of EOF in base64 encoded data can cause addi-
tional data following the base64 encoded block to be misin-
terpreted.
There should be some way of specifying a test that the BIO
can perform to reliably determine EOF (for example a MIME
boundary).
SEE ALSO
TBA
MirOS BSD #10-current 2005-02-05 2
