1PEM_BYTES_READ_BIO(3ossl)           OpenSSL          PEM_BYTES_READ_BIO(3ossl)
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NAME

6       PEM_bytes_read_bio, PEM_bytes_read_bio_secmem - read a PEM-encoded data
7       structure from a BIO
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SYNOPSIS

10        #include <openssl/pem.h>
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12        int PEM_bytes_read_bio(unsigned char **pdata, long *plen, char **pnm,
13                               const char *name, BIO *bp, pem_password_cb *cb,
14                               void *u);
15        int PEM_bytes_read_bio_secmem(unsigned char **pdata, long *plen, char **pnm,
16                                      const char *name, BIO *bp, pem_password_cb *cb,
17                                      void *u);
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DESCRIPTION

20       PEM_bytes_read_bio() reads PEM-formatted (IETF RFC 1421 and IETF RFC
21       7468) data from the BIO bp for the data type given in name (RSA PRIVATE
22       KEY, CERTIFICATE, etc.).  If multiple PEM-encoded data structures are
23       present in the same stream, PEM_bytes_read_bio() will skip non-matching
24       data types and continue reading.  Non-PEM data present in the stream
25       may cause an error.
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27       The PEM header may indicate that the following data is encrypted; if
28       so, the data will be decrypted, waiting on user input to supply a
29       passphrase if needed.  The password callback cb and rock u are used to
30       obtain the decryption passphrase, if applicable.
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32       Some data types have compatibility aliases, such as a file containing
33       X509 CERTIFICATE matching a request for the deprecated type
34       CERTIFICATE.  The actual type indicated by the file is returned in *pnm
35       if pnm is non-NULL.  The caller must free the storage pointed to by
36       *pnm.
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38       The returned data is the DER-encoded form of the requested type, in
39       *pdata with length *plen.  The caller must free the storage pointed to
40       by *pdata.
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42       PEM_bytes_read_bio_secmem() is similar to PEM_bytes_read_bio(), but
43       uses memory from the secure heap for its temporary buffers and the
44       storage returned in *pdata and *pnm.  Accordingly, the caller must use
45       OPENSSL_secure_free() to free that storage.
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NOTES

48       PEM_bytes_read_bio_secmem() only enforces that the secure heap is used
49       for storage allocated within the PEM processing stack.  The BIO stack
50       from which input is read may also use temporary buffers, which are not
51       necessarily allocated from the secure heap.  In cases where it is
52       desirable to ensure that the contents of the PEM file only appears in
53       memory from the secure heap, care is needed in generating the BIO
54       passed as bp.  In particular, the use of BIO_s_file() indicates the use
55       of the operating system stdio functionality, which includes buffering
56       as a feature; BIO_s_fd() is likely to be more appropriate in such
57       cases.
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59       These functions make no assumption regarding the pass phrase received
60       from the password callback.  It will simply be treated as a byte
61       sequence.
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RETURN VALUES

64       PEM_bytes_read_bio() and PEM_bytes_read_bio_secmem() return 1 for
65       success or 0 for failure.
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SEE ALSO

68       PEM_read_bio_ex(3), passphrase-encoding(7)
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HISTORY

71       PEM_bytes_read_bio_secmem() was introduced in OpenSSL 1.1.1
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74       Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
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76       Licensed under the Apache License 2.0 (the "License").  You may not use
77       this file except in compliance with the License.  You can obtain a copy
78       in the file LICENSE in the source distribution or at
79       <https://www.openssl.org/source/license.html>.
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833.1.1                             2023-08-31         PEM_BYTES_READ_BIO(3ossl)
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