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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc (build 1.5.0_02) on Wed Mar 22 19:19:10 PST 2006 --><TITLE>Key (Java Card API and Subsets)</TITLE><META NAME="keywords" CONTENT="javacard.security.Key interface"><LINK REL ="stylesheet" TYPE="text/css" HREF="../../stylesheet.css" TITLE="Style"><SCRIPT type="text/javascript">function windowTitle(){ parent.document.title="Key (Java Card API and Subsets)";}</SCRIPT><NOSCRIPT></NOSCRIPT></HEAD><BODY BGCOLOR="white" onload="windowTitle();"><!-- ========= START OF TOP NAVBAR ======= --><A NAME="navbar_top"><!-- --></A><A HREF="#skip-navbar_top" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/Key.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java Card </b><br><font size="-1">v2.2.2</font></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../javacard/security/InitializedMessageDigest.html" title="class in javacard.security"><B>PREV CLASS</B></A> <A HREF="../../javacard/security/KeyAgreement.html" title="class in javacard.security"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html?javacard/security/Key.html" target="_top"><B>FRAMES</B></A> <A HREF="Key.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_top"></A><!-- ========= END OF TOP NAVBAR ========= --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javacard.security</FONT><BR>Interface Key</H2><DL><DT><B>All Known Subinterfaces:</B> <DD><A HREF="../../javacard/security/AESKey.html" title="interface in javacard.security">AESKey</A>, <A HREF="../../javacard/security/DESKey.html" title="interface in javacard.security">DESKey</A>, <A HREF="../../javacard/security/DSAPrivateKey.html" title="interface in javacard.security">DSAPrivateKey</A>, <A HREF="../../javacard/security/DSAPublicKey.html" title="interface in javacard.security">DSAPublicKey</A>, <A HREF="../../javacard/security/ECPrivateKey.html" title="interface in javacard.security">ECPrivateKey</A>, <A HREF="../../javacard/security/ECPublicKey.html" title="interface in javacard.security">ECPublicKey</A>, <A HREF="../../javacard/security/HMACKey.html" title="interface in javacard.security">HMACKey</A>, <A HREF="../../javacard/security/KoreanSEEDKey.html" title="interface in javacard.security">KoreanSEEDKey</A>, <A HREF="../../javacard/security/PrivateKey.html" title="interface in javacard.security">PrivateKey</A>, <A HREF="../../javacard/security/PublicKey.html" title="interface in javacard.security">PublicKey</A>, <A HREF="../../javacard/security/RSAPrivateCrtKey.html" title="interface in javacard.security">RSAPrivateCrtKey</A>, <A HREF="../../javacard/security/RSAPrivateKey.html" title="interface in javacard.security">RSAPrivateKey</A>, <A HREF="../../javacard/security/RSAPublicKey.html" title="interface in javacard.security">RSAPublicKey</A>, <A HREF="../../javacard/security/SecretKey.html" title="interface in javacard.security">SecretKey</A></DD></DL><HR><DL><DT><PRE>public interface <B>Key</B></DL></PRE><P>The <code>Key</code> interface is the base interface for all keys.<p> <p>A <code>Key</code> object sets its initialized state to true only when all the associated <code>Key</code> object parameters have been set at least once since the time the initialized state was set to false. <p>A newly created <code>Key</code> object sets its initialized state to false. Invocation of the <code>clearKey()</code> method sets the initialized state to false. A key with transient key data sets its initialized state to false on the associated clear events.<P><P><DL><DT><B>See Also:</B><DD><A HREF="../../javacard/security/KeyBuilder.html" title="class in javacard.security"><CODE>KeyBuilder</CODE></A></DL><HR><P><!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2"><B>Method Summary</B></FONT></TH></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../javacard/security/Key.html#clearKey()">clearKey</A></B>()</CODE><BR> Clears the key and sets its initialized state to false.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> short</CODE></FONT></TD><TD><CODE><B><A HREF="../../javacard/security/Key.html#getSize()">getSize</A></B>()</CODE><BR> Returns the key size in number of bits.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> byte</CODE></FONT></TD><TD><CODE><B><A HREF="../../javacard/security/Key.html#getType()">getType</A></B>()</CODE><BR> Returns the key interface type.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../javacard/security/Key.html#isInitialized()">isInitialized</A></B>()</CODE><BR> Reports the initialized state of the key.</TD></TR></TABLE> <P><!-- ============ METHOD DETAIL ========== --><A NAME="method_detail"><!-- --></A><TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY=""><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2"><B>Method Detail</B></FONT></TH></TR></TABLE><A NAME="isInitialized()"><!-- --></A><H3>isInitialized</H3><PRE>boolean <B>isInitialized</B>()</PRE><DL><DD>Reports the initialized state of the key. Keys must be initialized before being used. <p>A <code>Key</code> object sets its initialized state to true only when all the associated <code>Key</code> object parameters have been set at least once since the time the initialized state was set to false. <p>A newly created <code>Key</code> object sets its initialized state to false. Invocation of the <code>clearKey()</code> method sets the initialized state to false. A key with transient key data sets its initialized state to false on the associated clear events.<P><DD><DL><DT><B>Returns:</B><DD><code>true</code> if the key has been initialized</DL></DD></DL><HR><A NAME="clearKey()"><!-- --></A><H3>clearKey</H3><PRE>void <B>clearKey</B>()</PRE><DL><DD>Clears the key and sets its initialized state to false.<P><DD><DL></DL></DD></DL><HR><A NAME="getType()"><!-- --></A><H3>getType</H3><PRE>byte <B>getType</B>()</PRE><DL><DD>Returns the key interface type.<P><DD><DL><DT><B>Returns:</B><DD>the key interface type. Valid codes listed in <code>TYPE_*</code> constants See <A HREF="../../javacard/security/KeyBuilder.html#TYPE_DES_TRANSIENT_RESET"><CODE>TYPE_DES_TRANSIENT_RESET</CODE></A>.<p><DT><B>See Also:</B><DD><A HREF="../../javacard/security/KeyBuilder.html" title="class in javacard.security"><CODE>KeyBuilder</CODE></A></DL></DD></DL><HR><A NAME="getSize()"><!-- --></A><H3>getSize</H3><PRE>short <B>getSize</B>()</PRE><DL><DD>Returns the key size in number of bits.<P><DD><DL><DT><B>Returns:</B><DD>the key size in number of bits</DL></DD></DL><!-- ========= END OF CLASS DATA ========= --><HR><!-- ======= START OF BOTTOM NAVBAR ====== --><A NAME="navbar_bottom"><!-- --></A><A HREF="#skip-navbar_bottom" title="Skip navigation links"></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY=""><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_bottom_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY=""> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/Key.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java Card </b><br><font size="-1">v2.2.2</font></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../javacard/security/InitializedMessageDigest.html" title="class in javacard.security"><B>PREV CLASS</B></A> <A HREF="../../javacard/security/KeyAgreement.html" title="class in javacard.security"><B>NEXT CLASS</B></A></FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../index.html?javacard/security/Key.html" target="_top"><B>FRAMES</B></A> <A HREF="Key.html" target="_top"><B>NO FRAMES</B></A> <SCRIPT type="text/javascript"> <!-- if(window==top) { document.writeln('<A HREF="../../allclasses-noframe.html"><B>All Classes</B></A>'); } //--></SCRIPT><NOSCRIPT> <A HREF="../../allclasses-noframe.html"><B>All Classes</B></A></NOSCRIPT></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: NESTED | FIELD | CONSTR | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | CONSTR | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><A NAME="skip-navbar_bottom"></A><!-- ======== END OF BOTTOM NAVBAR ======= --><HR><i>Copyright © 1993-2005 Sun Microsystems, Inc. 4150 Network Circle,<br>Santa Clara, CA, 95054, U.S.A. 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