SYNOPSIS

#include <libtasn1.h>

asn1_retCode asn1_der_decoding_startEnd(ASN1_TYPE element, const void * ider, int len, const char * name_element, int * start, int * end);

ARGUMENTS

ASN1_TYPE element

pointer to an ASN1 element

const void * ider

vector that contains the DER encoding.

int len

number of bytes of *ider: ider[0]..ider[len-1]

const char * name_element

an element of NAME structure.

int * start

the position of the first byte of NAME_ELEMENT decoding (ider[*start])

int * end

the position of the last byte of NAME_ELEMENT decoding (ider[*end])

DESCRIPTION

Find the start and end point of an element in a DER encoding string. I mean that if you have a der encoding and you have already used the function asn1_der_decoding() to fill a structure, it may happen that you want to find the piece of string concerning an element of the structure.

One example is the sequence "tbsCertificate" inside an X509 certificate.

RETURNS

ASN1_SUCCESS if DER encoding OK, ASN1_ELEMENT_NOT_FOUND if ELEMENT is ASN1_TYPE EMPTY or name_element is not a valid element, ASN1_TAG_ERROR or ASN1_DER_ERROR if the der encoding doesn't match the structure ELEMENT.

COPYRIGHT

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Copying and distribution of this file, with or without modification, are permitted in any medium without royalty provided the copyright notice and this notice are preserved.