OPENSSL_BIO(3) OpenSSL OPENSSL_BIO(3)NAME
bio - I/O abstraction
SYNOPSIS
#include <openssl/bio.h>
TBA
DESCRIPTION
A BIO is an I/O abstraction, it hides many of the underlying
I/O details from an application. If an application uses a
BIO for its I/O it can transparently handle SSL connections,
unencrypted network connections and file I/O.
There are two type of BIO, a source/sink BIO and a filter
BIO.
As its name implies a source/sink BIO is a source and/or
sink of data, examples include a socket BIO and a file BIO.
A filter BIO takes data from one BIO and passes it through
to another, or the application. The data may be left unmodi-
fied (for example a message digest BIO) or translated (for
example an encryption BIO). The effect of a filter BIO may
change according to the I/O operation it is performing: for
example an encryption BIO will encrypt data if it is being
written to and decrypt data if it is being read from.
BIOs can be joined together to form a chain (a single BIO is
a chain with one component). A chain normally consist of one
source/sink BIO and one or more filter BIOs. Data read from
or written to the first BIO then traverses the chain to the
end (normally a source/sink BIO).
SEE ALSOBIO_ctrl(3), BIO_f_base64(3), BIO_f_buffer(3),
BIO_f_cipher(3), BIO_f_md(3), BIO_f_null(3), BIO_f_ssl(3),
BIO_find_type(3), BIO_new(3), BIO_new_bio_pair(3),
BIO_push(3), BIO_read(3), BIO_s_accept(3), BIO_s_bio(3),
BIO_s_connect(3), BIO_s_fd(3), BIO_s_file(3), BIO_s_mem(3),
BIO_s_null(3), BIO_s_socket(3), BIO_set_callback(3),
BIO_should_retry(3)MirOS BSD #10-current 2005-02-05 1
