BIO_f_base64 (3)

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NAME

BIO_f_base64 - base64 BIO filter

SYNOPSIS

 #include <openssl/bio.h>
 #include <openssl/evp.h>

 BIO_METHOD *   BIO_f_base64(void);

DESCRIPTION

BIO_f_base64() returns the base64 method. This is a filter 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

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

The flag

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 VALUES

BIO_f_base64() returns the base64 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_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);

BUGS

The ambiguity of in base64 encoded data can cause additional data following the base64 encoded block to be misinterpreted.

There should be some way of specifying a test that the

can perform to reliably determine (for example a boundary).

SEE ALSO