I2D_RE_X509_TBS

Section: OpenSSL (3)
Updated: 2021-03-26
Page Index

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.

COPYRIGHT

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>.