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

SYNOPSIS

        #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);

DESCRIPTION

       The X509 encode and decode routines encode and parse an X509 structure, which represents an X509
       certificate.

       d2i_X509_AUX() is similar to d2i_X509(3) but the input is expected to consist of an X509 certificate
       followed by auxiliary trust information.  This is used by the PEM routines to read "TRUSTED CERTIFICATE"
       objects.  This function should not be called on untrusted input.

       i2d_X509_AUX() is similar to i2d_X509(3), but the encoded output contains both the certificate and any
       auxiliary trust information.  This is used by the PEM routines to write "TRUSTED CERTIFICATE" objects.
       Note that this is a non-standard OpenSSL-specific data format.

       i2d_re_X509_tbs() is similar to i2d_X509(3) except it encodes only the TBSCertificate portion of the
       certificate.  i2d_re_X509_CRL_tbs() and i2d_re_X509_REQ_tbs() are analogous for CRL and certificate
       request, respectively.  The "re" in i2d_re_X509_tbs stands for "re-encode", and ensures that a fresh
       encoding is generated in case the object has been modified after creation (see the BUGS section).

       The encoding of the TBSCertificate portion of a certificate is cached in the X509 structure internally to
       improve encoding performance and to ensure certificate signatures are verified correctly in some
       certificates with broken (non-DER) encodings.

       If, after modification, the X509 object is re-signed with X509_sign(), the encoding is automatically
       renewed. Otherwise, the encoding of the TBSCertificate portion of the X509 can be manually renewed by
       calling i2d_re_X509_tbs().

RETURN VALUES

       d2i_X509_AUX() returns a valid X509 structure or NULL if an error occurred.

       i2d_X509_AUX() returns the length of encoded data or -1 on error.

       i2d_re_X509_tbs(), i2d_re_X509_CRL_tbs() and i2d_re_X509_REQ_tbs() return the length of encoded data or 0
       on error.

SEE ALSO

       ERR_get_error(3) X509_CRL_get0_by_serial(3), X509_get0_signature(3), X509_get_ext_d2i(3),
       X509_get_extension_flags(3), X509_get_pubkey(3), X509_get_subject_name(3), X509_get_version(3),
       X509_NAME_add_entry_by_txt(3), X509_NAME_ENTRY_get_object(3), X509_NAME_get_index_by_NID(3),
       X509_NAME_print_ex(3), X509_new(3), X509_sign(3), X509V3_get_d2i(3), X509_verify_cert(3)

COPYRIGHT

       Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (the "License").  You may not use this file except in compliance with
       the License.  You can obtain a copy in the file LICENSE in the source distribution or at
       <https://www.openssl.org/source/license.html>.