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.\" ========================================================================
.\"
.IX Title "PEM_READ_BIO_EX 3"
.TH PEM_READ_BIO_EX 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
PEM_read_bio_ex, PEM_FLAG_SECURE, PEM_FLAG_EAY_COMPATIBLE, PEM_FLAG_ONLY_B64 \- read PEM format files with custom processing
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/pem.h>
\&
\& #define PEM_FLAG_SECURE             0x1
\& #define PEM_FLAG_EAY_COMPATIBLE     0x2
\& #define PEM_FLAG_ONLY_B64           0x4
\& int PEM_read_bio_ex(BIO *in, char **name, char **header,
\&                     unsigned char **data, long *len, unsigned int flags);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBPEM_read_bio_ex()\fR reads in \s-1PEM\s0 formatted data from an input \s-1BIO,\s0 outputting
the name of the type of contained data, the header information regarding
the possibly encrypted data, and the binary data payload (after base64 decoding).
It should generally only be used to implement PEM_read_bio_\-family functions
for specific data types or other usage, but is exposed to allow greater flexibility
over how processing is performed, if needed.
.PP
If \s-1PEM_FLAG_SECURE\s0 is set, the intermediate buffers used to read in lines of
input are allocated from the secure heap.
.PP
If \s-1PEM_FLAG_EAY_COMPATIBLE\s0 is set, a simple algorithm is used to remove whitespace
and control characters from the end of each line, so as to be compatible with
the historical behavior of \fBPEM_read_bio()\fR.
.PP
If \s-1PEM_FLAG_ONLY_B64\s0 is set, all characters are required to be valid base64
characters (or newlines); non\-base64 characters are treated as end of input.
.PP
If neither \s-1PEM_FLAG_EAY_COMPATIBLE\s0 or \s-1PEM_FLAG_ONLY_B64\s0 is set, control characters
are ignored.
.PP
If both \s-1PEM_FLAG_EAY_COMPATIBLE\s0 and \s-1PEM_FLAG_ONLY_B64\s0 are set, an error is returned;
these options are not compatible with each other.
.SH "NOTES"
.IX Header "NOTES"
The caller must release the storage allocated for *name, *header, and *data.
If \s-1PEM_FLAG_SECURE\s0 was set, use \fBOPENSSL_secure_free()\fR; otherwise,
\&\fBOPENSSL_free()\fR is used.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBPEM_read_bio_ex()\fR returns 1 for success or 0 for failure.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBPEM_bytes_read_bio\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The \fBPEM_read_bio_ex()\fR function was added in OpenSSL 1.1.1.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
