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(const 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 2002-2021 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (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>.