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+.\" $OpenBSD: PEM_bytes_read_bio.3,v 1.8 2025/07/16 17:59:10 schwarze Exp $
+.\" selective merge up to:
+.\" OpenSSL PEM_bytes_read_bio.pod 7671342e Feb 29 15:47:12 2016 -0600
+.\"
+.\" This file is a derived work.
+.\" The changes are covered by the following Copyright and license:
+.\" Copyright (c) 2020 Ingo Schwarze <schwarze@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.\" The original file was written by Benjamin Kaduk <bkaduk at akamai dot com>.
+.\" Copyright (c) 2017 The OpenSSL Project.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\"
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" 3. All advertising materials mentioning features or use of this
+.\"    software must display the following acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+.\"
+.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+.\"    endorse or promote products derived from this software without
+.\"    prior written permission. For written permission, please contact
+.\"    openssl-core@openssl.org.
+.\"
+.\" 5. Products derived from this software may not be called "OpenSSL"
+.\"    nor may "OpenSSL" appear in their names without prior written
+.\"    permission of the OpenSSL Project.
+.\"
+.\" 6. Redistributions of any form whatsoever must retain the following
+.\"    acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+.\" OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd $Mdocdate: July 16 2025 $
+.Dt PEM_BYTES_READ_BIO 3
+.Os
+.Sh NAME
+.Nm PEM_bytes_read_bio
+.Nd read a PEM-encoded data structure from a BIO
+.Sh SYNOPSIS
+.Lb libcrypto
+.In openssl/pem.h
+.Ft int
+.Fo PEM_bytes_read_bio
+.Fa "unsigned char **pdata"
+.Fa "long *plen"
+.Fa "char **pnm"
+.Fa "const char *name"
+.Fa "BIO *in_bp"
+.Fa "pem_password_cb *cb"
+.Fa "void *u"
+.Fc
+.Sh DESCRIPTION
+.Fn PEM_bytes_read_bio
+reads and PEM decodes the first object of type
+.Fa name
+.Pq e.g. RSA PRIVATE KEY, CERTIFICATE, etc.\&
+from
+.Fa in_bp .
+If multiple PEM-encoded data structures are present in the same stream,
+it skips non-matching data types and continues reading.
+Before reading each PEM object, lines not starting with
+.Qq "-----BEGIN "
+are also skipped; see
+.Xr PEM_read_bio 3
+for details of PEM parsing.
+.Pp
+The PEM header may indicate that the following data is encrypted; if so,
+the data is decrypted, optionally using
+.Fa cb
+and
+.Fa u ,
+as described in
+.Xr pem_password_cb 3 .
+.Pp
+Some data types have compatibility aliases, such as a file containing
+X509 CERTIFICATE matching a request for the deprecated type CERTIFICATE.
+The actual type indicated by the file is returned in
+.Em *pnm
+if
+.Fa pnm
+is
+.Pf non- Dv NULL .
+The caller must free the storage pointed to by
+.Em *pnm .
+.Pp
+The returned data is the DER-encoded form of the requested type, in
+.Em *pdata
+with length
+.Em *plen .
+The caller must free the storage pointed to by
+.Em *pdata .
+.Sh RETURN VALUES
+.Fn PEM_bytes_read_bio
+returns 1 for success or 0 for failure.
+.Sh ERRORS
+Diagnostics that can be retrieved with
+.Xr ERR_get_error 3 ,
+.Xr ERR_GET_REASON 3 ,
+and
+.Xr ERR_reason_error_string 3
+include:
+.Bl -tag -width Ds
+.It Dv PEM_R_NO_START_LINE Qq no start line
+No more PEM objects were found in the input.
+This can happen when the input contains no PEM objects at all,
+or only objects that do not match the type
+.Fa name .
+.It Dv PEM_R_NOT_PROC_TYPE Qq not proc type
+The first PEM header does not start with
+.Qq "Proc-Type: " .
+.It Dv PEM_R_NOT_ENCRYPTED Qq not encrypted
+The Proc-Type header differs from
+.Qq 4,ENCRYPTED .
+.It Dv PEM_R_SHORT_HEADER Qq short header
+The Proc-Type header is the last header line.
+.It Dv PEM_R_NOT_DEK_INFO Qq not dek info
+The second PEM header does not start with
+.Qq "DEK-Info: " .
+.It Dv PEM_R_UNSUPPORTED_ENCRYPTION Qq unsupported encryption
+The cipher name given in the DEK-Info header is unknown to
+.Xr EVP_get_cipherbyname 3 .
+.It Dv PEM_R_BAD_IV_CHARS Qq "bad iv chars"
+The word following the cipher name in the DEK-Info header
+contains bytes that are not hexadecimal digits.
+This also happens when the initialization vector is missing or too short.
+.It Dv PEM_R_BAD_PASSWORD_READ Qq bad password read
+.Fa cb
+reported failure.
+This may for example happen when the user mistypes the password.
+.It Dv PEM_R_BAD_DECRYPT Qq bad decrypt
+.Xr EVP_DecryptInit_ex 3 ,
+.Xr EVP_DecryptUpdate 3 ,
+or
+.Xr EVP_DecryptFinal_ex 3
+failed.
+.El
+.Pp
+Additional types of errors can result from
+.Xr PEM_read_bio 3 .
+.Sh SEE ALSO
+.Xr PEM_ASN1_read 3 ,
+.Xr PEM_read 3 ,
+.Xr PEM_read_bio_PrivateKey 3 ,
+.Xr PEM_X509_INFO_read_bio 3
+.Sh STANDARDS
+RFC 1421: Privacy Enhancement for Internet Electronic Mail (PEM), Part I
+.Sh HISTORY
+.Fn PEM_bytes_read_bio
+first appeared in OpenSSL 0.9.7 and has been available since
+.Ox 3.2 .