Manual Pages for UNIX Operating System command usage for man BIO_f_base64

OpenSSL                                    BIO_f_base64(3openssl)



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     BIO_f_base64 - base64 BIO filter

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      #include 
      #include 

      BIO_METHOD *   BIO_f_base64(void);


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     BIO_f_base64() returns the base64 BIO method. This is a
     filter BIO 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 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() to encode the data all on one line or expect
     the data to be all on one line.

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     Because of the format of base64 encoding the end of the
     encoded block cannot always be reliably determined.

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     BIO_f_base64() returns the base64 BIO method.

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     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 = BIO_push(b64, bio);
      BIO_write(bio, message, strlen(message));
      BIO_flush(bio);

      BIO_free_all(bio);

     Read Base64 encoded data from standard input and write the
     decoded data to standard output:






2/Nov/2005             Last change: 0.9.8o                      1






OpenSSL                                    BIO_f_base64(3openssl)



      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 = BIO_push(b64, bio);
      while((inlen = BIO_read(bio, inbuf, 512)) > 0)
             BIO_write(bio_out, inbuf, inlen);

      BIO_free_all(bio);


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     The ambiguity of EOF 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 BIO
     can perform to reliably determine EOF (for example a MIME
     boundary).

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     TBA






























2/Nov/2005             Last change: 0.9.8o                      2