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NAMEBIO_push, BIO_pop, BIO_set_next - add and remove BIOs from a chain
#include <openssl/bio.h> BIO *BIO_push(BIO *b, BIO *append); BIO *BIO_pop(BIO *b); void BIO_set_next(BIO *b, BIO *next);
DESCRIPTIONThe BIO_push() function appends the
BIO_pop() removes the
BIO_set_next() replaces the existing next
NOTESThe names of these functions are perhaps a little misleading. BIO_push() joins two
The process of calling BIO_push() and BIO_pop() on a
EXAMPLESFor these examples suppose md1 and md2 are digest BIOs, b64 is a base64
If the call:
is made then the new chain will be b64-f. After making the calls
BIO_push(md2, b64); BIO_push(md1, md2);
the new chain is md1-md2-b64-f. Data written to md1 will be digested by md1 and md2, base64 encoded and written to f.
It should be noted that reading causes data to pass in the reverse direction, that is data is read from f, base64 decoded and digested by md1 and md2. If the call:
The call will return b64 and the new chain will be md1-b64-f data can be written to md1 as before.
RETURN VALUESBIO_push() returns the end of the chain, b.
BIO_pop() returns the next
HISTORYThe BIO_set_next() function was added in OpenSSL 1.1.0.
COPYRIGHTCopyright 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