1BIO_F_BASE64(3) OpenSSL BIO_F_BASE64(3)
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6 BIO_f_base64 - base64 BIO filter
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9 #include <openssl/bio.h>
10 #include <openssl/evp.h>
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12 const BIO_METHOD *BIO_f_base64(void);
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15 BIO_f_base64() returns the base64 BIO method. This is a filter BIO that
16 base64 encodes any data written through it and decodes any data read
17 through it.
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19 Base64 BIOs do not support BIO_gets() or BIO_puts().
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21 BIO_flush() on a base64 BIO that is being written through is used to
22 signal that no more data is to be encoded: this is used to flush the
23 final block through the BIO.
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25 The flag BIO_FLAGS_BASE64_NO_NL can be set with BIO_set_flags() to
26 encode the data all on one line or expect the data to be all on one
27 line.
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30 Because of the format of base64 encoding the end of the encoded block
31 cannot always be reliably determined.
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34 BIO_f_base64() returns the base64 BIO method.
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37 Base64 encode the string "Hello World\n" and write the result to
38 standard output:
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40 BIO *bio, *b64;
41 char message[] = "Hello World \n";
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43 b64 = BIO_new(BIO_f_base64());
44 bio = BIO_new_fp(stdout, BIO_NOCLOSE);
45 BIO_push(b64, bio);
46 BIO_write(b64, message, strlen(message));
47 BIO_flush(b64);
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49 BIO_free_all(b64);
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51 Read Base64 encoded data from standard input and write the decoded data
52 to standard output:
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54 BIO *bio, *b64, *bio_out;
55 char inbuf[512];
56 int inlen;
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58 b64 = BIO_new(BIO_f_base64());
59 bio = BIO_new_fp(stdin, BIO_NOCLOSE);
60 bio_out = BIO_new_fp(stdout, BIO_NOCLOSE);
61 BIO_push(b64, bio);
62 while ((inlen = BIO_read(b64, inbuf, 512)) > 0)
63 BIO_write(bio_out, inbuf, inlen);
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65 BIO_flush(bio_out);
66 BIO_free_all(b64);
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69 The ambiguity of EOF in base64 encoded data can cause additional data
70 following the base64 encoded block to be misinterpreted.
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72 There should be some way of specifying a test that the BIO can perform
73 to reliably determine EOF (for example a MIME boundary).
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76 Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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78 Licensed under the OpenSSL license (the "License"). You may not use
79 this file except in compliance with the License. You can obtain a copy
80 in the file LICENSE in the source distribution or at
81 <https://www.openssl.org/source/license.html>.
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851.1.1 2018-09-11 BIO_F_BASE64(3)