45 lines
1.2 KiB
XML
45 lines
1.2 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<refentry id="scasn1readtag">
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<refentryinfo><title>OpenSC API Reference</title></refentryinfo>
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<refmeta>
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<refentrytitle>sc_asn1_read_tag</refentrytitle>
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<manvolnum>3</manvolnum>
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<refmiscinfo>opensc</refmiscinfo>
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</refmeta>
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<refnamediv>
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<refname>sc_asn1_read_tag</refname>
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<refpurpose>Extract a tag from an ASN.1 entry</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Synopsis</title>
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<para>
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<programlisting>
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#include <opensc.h>
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int sc_asn1_read_tag(const unsigned char **buf, size_t buflen,
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unsigned int *cla_out, unsigned int *tag_out, size_t *taglen);
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</programlisting>
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</para>
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</refsect1>
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<refsect1>
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<title>Description</title>
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<para>
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This function extracts a tag from an ASN.1 entry at the buffer pointed to by
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the pointer in <emphasis>buf</emphasis>. The buffer is <emphasis>buflen</emphasis> bytes long.
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The tag class will be stored in <emphasis>cla_out</emphasis>, the tag itself in
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<emphasis>tag_out</emphasis>, and the length of the extracted tag in
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<emphasis>tag_len</emphasis>.
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</para>
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</refsect1>
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<refsect1>
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<title>Return value</title>
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<para>
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Returns 1 if successful, or -1 in case of error.
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</para>
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</refsect1>
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</refentry>
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