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asn1_der_decoding_startEnd

Section: libtasn1 (3)
Updated: 4.8
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NAME

asn1_der_decoding_startEnd - API function

SYNOPSIS

#include <libtasn1.h>

int asn1_der_decoding_startEnd(asn1_node element, const void * ider, int ider_len, const char * name_element, int * start, int * end);

ARGUMENTS

asn1_node element: pointer to an ASN1 element
const void * ider: vector that contains the DER encoding.
int ider_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.

Note that since libtasn1 3.7 the ider and ider_len parameters can be omitted, if the element is already decoded using asn1_der_decoding().

RETURNS

ASN1_SUCCESS if DER encoding OK, ASN1_ELEMENT_NOT_FOUND if ELEMENT is asn1_node 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.

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