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.\" ========================================================================
.\"
.IX Title "I2D_RE_X509_TBS 3"
.TH I2D_RE_X509_TBS 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"
d2i_X509_AUX, i2d_X509_AUX, i2d_re_X509_tbs, i2d_re_X509_CRL_tbs, i2d_re_X509_REQ_tbs \&\- X509 encode and decode functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509.h>
\&
\& X509 *d2i_X509_AUX(X509 **px, const unsigned char **in, long len);
\& int i2d_X509_AUX(X509 *x, unsigned char **out);
\& int i2d_re_X509_tbs(X509 *x, unsigned char **out);
\& int i2d_re_X509_CRL_tbs(X509_CRL *crl, unsigned char **pp);
\& int i2d_re_X509_REQ_tbs(X509_REQ *req, unsigned char **pp);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The X509 encode and decode routines encode and parse an
\&\fBX509\fR structure, which represents an X509 certificate.
.PP
\&\fBd2i_X509_AUX()\fR is similar to \fBd2i_X509\fR\|(3) but the input is expected to
consist of an X509 certificate followed by auxiliary trust information.
This is used by the \s-1PEM\s0 routines to read \*(L"\s-1TRUSTED CERTIFICATE\*(R"\s0 objects.
This function should not be called on untrusted input.
.PP
\&\fBi2d_X509_AUX()\fR is similar to \fBi2d_X509\fR\|(3), but the encoded output
contains both the certificate and any auxiliary trust information.
This is used by the \s-1PEM\s0 routines to write \*(L"\s-1TRUSTED CERTIFICATE\*(R"\s0 objects.
Note that this is a non-standard OpenSSL-specific data format.
.PP
\&\fBi2d_re_X509_tbs()\fR is similar to \fBi2d_X509\fR\|(3) except it encodes only
the TBSCertificate portion of the certificate.  \fBi2d_re_X509_CRL_tbs()\fR
and \fBi2d_re_X509_REQ_tbs()\fR are analogous for \s-1CRL\s0 and certificate request,
respectively.  The \*(L"re\*(R" in \fBi2d_re_X509_tbs\fR stands for \*(L"re-encode\*(R",
and ensures that a fresh encoding is generated in case the object has been
modified after creation (see the \s-1BUGS\s0 section).
.PP
The encoding of the TBSCertificate portion of a certificate is cached
in the \fBX509\fR structure internally to improve encoding performance
and to ensure certificate signatures are verified correctly in some
certificates with broken (non-DER) encodings.
.PP
If, after modification, the \fBX509\fR object is re-signed with \fBX509_sign()\fR,
the encoding is automatically renewed. Otherwise, the encoding of the
TBSCertificate portion of the \fBX509\fR can be manually renewed by calling
\&\fBi2d_re_X509_tbs()\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBd2i_X509_AUX()\fR returns a valid \fBX509\fR structure or \s-1NULL\s0 if an error occurred.
.PP
\&\fBi2d_X509_AUX()\fR returns the length of encoded data or \-1 on error.
.PP
\&\fBi2d_re_X509_tbs()\fR, \fBi2d_re_X509_CRL_tbs()\fR and \fBi2d_re_X509_REQ_tbs()\fR return the
length of encoded data or 0 on error.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBERR_get_error\fR\|(3)
\&\fBX509_CRL_get0_by_serial\fR\|(3),
\&\fBX509_get0_signature\fR\|(3),
\&\fBX509_get_ext_d2i\fR\|(3),
\&\fBX509_get_extension_flags\fR\|(3),
\&\fBX509_get_pubkey\fR\|(3),
\&\fBX509_get_subject_name\fR\|(3),
\&\fBX509_get_version\fR\|(3),
\&\fBX509_NAME_add_entry_by_txt\fR\|(3),
\&\fBX509_NAME_ENTRY_get_object\fR\|(3),
\&\fBX509_NAME_get_index_by_NID\fR\|(3),
\&\fBX509_NAME_print_ex\fR\|(3),
\&\fBX509_new\fR\|(3),
\&\fBX509_sign\fR\|(3),
\&\fBX509V3_get_d2i\fR\|(3),
\&\fBX509_verify_cert\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2002\-2018 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>.