Api function
#include <libtasn1.h>
long asn1_get_length_der(const unsigned char * der, int der_len, int * len);
DER data to decode.
Length of DER data to decode.
Output variable containing the length of the DER length field.
Extract a length field from DER data.
Return the decoded length value, or -1 on indefinite length, or -2 when the value was too big to fit in a int, or -4 when the decoded length value plus len would exceed der_len .
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The full documentation for libtasn1 is maintained as a Texinfo manual. If the info and libtasn1 programs are properly installed at your site, the command
info libtasn1
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http://www.gnu.org/software/libtasn1/manual/