scan_asn1dertag man page

scan_asn1dertag — decode an unsigned integer from ASN.1 DER length encoding

Syntax

#include <scan.h>

size_t scan_asn1dertag(const char *src,size_t len,unsigned long long *dest);

Description

scan_asn1dertag decodes an unsigned integer in ASN.1 DER tag encoding from a memory area holding binary data. It writes the decode value in dest and returns the number of bytes it read from src.

scan_asn1dertag never reads more than len bytes from src. If the sequence is longer than that, or the memory area contains an invalid sequence, scan_asn1dertag returns 0 and does not touch dest.

The length of the longest ASN.1 DER length sequence is 128 bytes. In practice the largest sequence is sizeof(*dest)+1.

See Also

fmt_asn1dertag(3)

Referenced By

fmt_asn1dertag(3).