42 lines
1.0 KiB
XML
42 lines
1.0 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<refentry id="scgetchallenge">
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<refentryinfo><title>OpenSC API Reference</title></refentryinfo>
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<refmeta>
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<refentrytitle>sc_get_challenge</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_get_challenge</refname>
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<refpurpose>Request a challenge from a card</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_get_challenge(struct sc_card *card, unsigned char *rnd, size_t len);
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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 requests a challenge (i.e. random bytes) from
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<emphasis>card</emphasis>. The returned data will be stored in
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<emphasis>rnd</emphasis>, and will be <emphasis>len</emphasis> bytes long.
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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 0 if successful, or a negative value in case of error.
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</para>
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</refsect1>
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</refentry>
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