| Name | Size | Mode | Actions |
|---|---|---|---|
| bio.html | 4494 | 0644 | editdlrm |
| crypto.html | 2941 | 0644 | editdlrm |
| ct.html | 2773 | 0644 | editdlrm |
| des_modes.html | 8132 | 0644 | editdlrm |
| Ed448.html | 4463 | 0644 | editdlrm |
| Ed25519.html | 4463 | 0644 | editdlrm |
| evp.html | 7513 | 0644 | editdlrm |
| ossl_store-file.html | 3304 | 0644 | editdlrm |
| ossl_store.html | 4053 | 0644 | editdlrm |
| passphrase-encoding.html | 9041 | 0644 | editdlrm |
| proxy-certificates.html | 14546 | 0644 | editdlrm |
| RAND.html | 4699 | 0644 | editdlrm |
| RAND_DRBG.html | 15954 | 0644 | editdlrm |
| RSA-PSS.html | 3362 | 0644 | editdlrm |
| scrypt.html | 5524 | 0644 | editdlrm |
| SM2.html | 3973 | 0644 | editdlrm |
| ssl.html | 51115 | 0644 | editdlrm |
| X448.html | 3648 | 0644 | editdlrm |
| x509.html | 3808 | 0644 | editdlrm |
| X25519.html | 3648 | 0644 | editdlrm |
/opt/cpanel/ea-openssl11/share/doc/openssl/html/man7/bio.html (4494B)
bio - Basic I/O abstraction
#include <openssl/bio.h>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 unmodified (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).
Some BIOs (such as memory BIOs) can be used immediately after calling BIO_new(). Others (such as file BIOs) need some additional initialization, and frequently a utility function exists to create and initialize such BIOs.
If BIO_free() is called on a BIO chain it will only free one BIO resulting in a memory leak.
Calling BIO_free_all() on a single BIO has the same effect as calling BIO_free() on it other than the discarded return value.
Normally the type argument is supplied by a function which returns a pointer to a BIO_METHOD. There is a naming convention for such functions: a source/sink BIO is normally called BIO_s_*() and a filter BIO BIO_f_*();
Create a memory BIO:
BIO *mem = BIO_new(BIO_s_mem());BIO_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_ex(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)
Copyright 2000-2019 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.