43 lines
1.2 KiB
XML
43 lines
1.2 KiB
XML
<refentry id="scasn1findtag">
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<refmeta>
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<refentrytitle>sc_asn1_find_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_find_tag</refname>
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<refpurpose>Find a tag in an ASN.1 stream</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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const unsigned char *sc_asn1_find_tag(struct sc_context *ctx,
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const unsigned char *buf, size_t buflen,
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unsigned int tag_in, size_t *taglen_in);
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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 tries to find an ASN.1 tag matching <emphasis>tag_in</emphasis> in the buffer
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pointed to by <emphasis>buf</emphasis>, which is of size <emphasis>buflen</emphasis>. The buffer
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should contain a series of ASN.1 entries.
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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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If the specified tag was not found, NULL is returned. If found, the address where it was found is
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returned, and <emphasis>taglen_in</emphasis> is set to the length of the found tag.
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</para>
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</refsect1>
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</refentry>
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