#include <openssl/bio.h> #include <openssl/evp.h> const BIO_METHOD *BIO_f_base64(void);
Base64 BIOs do not support BIO_gets() or BIO_puts().
For writing, output is by default divided to lines of length 64 characters and there is always a newline at the end of output.
For reading, first line should be at most 1024 characters long. If it is longer then it is ignored completely. Other input lines can be of any length. There must be a newline at the end of input.
This behavior can be changed with BIO_FLAGS_BASE64_NO_NL flag.
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(). For writing, it causes all data to be written on one line without newline at the end. For reading, it expects the data to be all on one line (with or without a trailing newline).
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);
There should be some way of specifying a test that the BIO can perform to reliably determine EOF (for example a MIME boundary).
Licensed under the Apache License 2.0 (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>.