asn1_get_length_der(3) libtasn1 asn1_get_length_der(3)

asn1_get_length_der - 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

should give you access to the complete manual. As an alternative you may obtain the manual from:

https://www.gnu.org/software/libtasn1/manual/
4.18.0 libtasn1