OpenSC API Reference
sc_asn1_read_tag
3
opensc
sc_asn1_read_tag
Extract a tag from an ASN.1 entry
Synopsis
#include <opensc.h>
int sc_asn1_read_tag(const unsigned char **buf, size_t buflen,
unsigned int *cla_out, unsigned int *tag_out, size_t *taglen);
Description
This function extracts a tag from an ASN.1 entry at the buffer pointed to by
the pointer in buf. The buffer is buflen bytes long.
The tag class will be stored in cla_out, the tag itself in
tag_out, and the length of the extracted tag in
tag_len.
Return value
Returns 1 if successful, or -1 in case of error.